/* ========================================
   ESTILOS PRINCIPAIS - Greight
   ======================================== */

/* Reset e Configurações Gerais */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Cores principais */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Cores neutras */
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Espaçamentos */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transições */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Responsividade global para imagens e mídias */
img, video, canvas {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Prevent zoom on input focus (iOS) */
input, select, textarea {
    font-size: 16px;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Touch feedback para botões mobile */
button, .btn, a {
    -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
    touch-action: manipulation;
}

/* ========================================
   SCROLLBAR CUSTOMIZADA
   ======================================== */

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--bg-color);
}

/* Chrome, Edge, Safari */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    border: 2px solid var(--bg-color);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
}

::-webkit-scrollbar-thumb:active {
    background: var(--primary-hover);
}

/* Scrollbar para elementos específicos com fundo diferente */
.modal-body::-webkit-scrollbar-track,
.groups-list::-webkit-scrollbar-track {
    background: var(--surface-color);
}

/* ========================================
   LAYOUT
   ======================================== */

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Gerenciamento de Telas */
.screen {
    display: none;
    min-height: 100vh;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: block;
}

/* Loading Screen */
#loading-screen {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: 2rem;
}

.loading-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    animation: pulse 2s ease-in-out infinite;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(0.95);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   HEADER
   ======================================== */
.app-header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 85px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-logo-img {
    /* width: 32px; */
    height: 44px;
    object-fit: contain;
}

.app-header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

/* Header mais compacto para o dashboard */
.dashboard-header {
    padding: var(--spacing-md) 0;
    margin-bottom: 50px;
}

.dashboard-header h1 {
    font-size: 1.125rem;
    font-weight: 600;
}

.dashboard-header .header-content {
    min-height: 40px;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* ========================================
   TOGGLE SWITCH TEMA
   ======================================== */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
    cursor: pointer;
    flex-shrink: 0;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: all var(--transition-base);
    border-radius: 34px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.theme-slider:before {
    content: "🌙";
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: all var(--transition-base);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.theme-switch input:checked + .theme-slider {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.theme-switch input:checked + .theme-slider:before {
    content: "☀️";
    transform: translateX(24px);
}

.theme-switch:hover .theme-slider {
    opacity: 0.9;
}

/* ========================================
   TELA DE AUTENTICAÇÃO
   ======================================== */
#auth-screen.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.auth-card {
    background: var(--surface-color);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-card .logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.auth-card .app-logo {
    /* width: 80px; */
    height: 128px;
    object-fit: contain;
}

.auth-card h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 0.95rem;
}

/* Tabs de Login/Registro */
.auth-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    background-color: var(--bg-color);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.auth-tab:hover {
    color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.1);
}

.auth-tab.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Formulários de Auth */
.auth-form {
    display: none;
    animation: fadeIn 0.3s ease;
}

.auth-form.active {
    display: block;
}

/* Link "Esqueci minha senha" */
.forgot-password-link {
    text-align: right;
    margin-top: -0.5rem;
    margin-bottom: 1rem;
}

.forgot-password-link a {
    color: var(--primary-color);
    font-size: 0.85rem;
    text-decoration: none;
    transition: color 0.2s;
}

.forgot-password-link a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Steps do Registro/Recuperação */
.verification-info {
    background-color: var(--bg-color);
    border-left: 3px solid var(--primary-color);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.verification-info p {
    margin: 0.25rem 0;
    color: var(--text-secondary);
}

.verification-email {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1rem;
}

.code-display {
    display: block;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: var(--success-bg);
    color: var(--success-color);
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-align: center;
}

/* Divider "ou" */
.auth-divider {
    display: flex;
    align-items: center;
    margin: var(--spacing-xl) 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.auth-divider span {
    padding: 0 var(--spacing-md);
}

/* Botão do Google */
#google-signin-button,
#google-signup-button {
    display: flex;
    justify-content: center;
}

/* ========================================
   FORMULÁRIOS
   ======================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.required-label {
    color: var(--danger-color);
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--surface-color);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

#register-step-2 .btn:last-child {
    margin-top: 20px;
}

/* ========================================
   BOTÕES
   ======================================== */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-color);
    border-color: var(--primary-color);
}

.btn-large {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--bg-color);
}

/* ========================================
   USER INFO
   ======================================== */
.user-welcome {
    padding: var(--spacing-xl) 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    border: 3px solid var(--surface-color);
    box-shadow: var(--shadow-md);
}

.user-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Estilos genéricos para avatares */
.avatar,
.member-avatar,
.detail-member-avatar,
.history-avatar,
.modal-ranking-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: white;
    font-weight: 700;
    text-transform: uppercase;
    flex-shrink: 0;
}

.member-avatar,
.detail-member-avatar {
    width: 40px;
    height: 40px;
    font-size: 1rem;
}

.history-avatar {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
}

.modal-ranking-avatar {
    width: 48px;
    height: 48px;
    font-size: 1rem;
}

/* ========================================
   GRUPOS
   ======================================== */
.groups-container {
    padding: var(--spacing-xl) 0;
}

.groups-container h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.groups-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.group-card {
    background-color: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.group-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.group-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.group-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.group-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.groups-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.groups-actions .btn {
    flex: 1;
    min-width: 200px;
}

/* ========================================
   DASHBOARD
   ======================================== */
.group-code-banner {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.group-code-banner strong {
    font-size: 1.2rem;
    letter-spacing: 2px;
}

.add-study-section {
    margin: var(--spacing-xl) 0;
}

/* Destaques do Grupo */
.highlights-section {
    margin-bottom: var(--spacing-xl);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.highlight-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    color: white;
    transition: all var(--transition-base);
}

.highlight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.highlight-header-mini {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.highlight-icon-mini {
    font-size: 1.5rem;
}

.highlight-header-mini h4 {
    color: white;
    font-size: 0.95rem;
    margin: 0;
    font-weight: 600;
}

.highlight-content-mini {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.highlight-avatar-mini {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    background-color: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    flex-shrink: 0;
    color: white;
}

.highlight-info-mini {
    flex: 1;
    min-width: 0;
}

.highlight-name-mini {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: white;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.highlight-stat-mini {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.9);
}

.highlight-emoji-mini {
    font-size: 1rem;
}

/* Estatísticas do Usuário */
.user-stats-card {
    background-color: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.user-stats-card .stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.user-stats-card h3 {
    margin: 0;
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
}

.stat-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Seções Comuns */
.badges-section,
.ranking-section,
.members-section,
.history-section {
    background-color: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    margin-bottom: 150px;
}

.badges-section h3,
.ranking-section h3,
.members-section h3,
.history-section h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* Badges */
.badges-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.badge {
    background-color: var(--bg-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border: 2px solid var(--border-color);
    transition: all var(--transition-fast);
}

.badge.earned {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    border-color: #d97706;
    color: white;
    box-shadow: var(--shadow-md);
}

.badge-icon {
    font-size: 1.5rem;
}

.badge-info {
    display: flex;
    flex-direction: column;
}

.badge-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.badge-description {
    font-size: 0.75rem;
    opacity: 0.9;
}

/* Ranking */
.ranking-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.ranking-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.ranking-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.ranking-item:hover {
    background-color: var(--border-color);
}

.ranking-position {
    font-size: 1.5rem;
    font-weight: 700;
    min-width: 40px;
    text-align: center;
}

.ranking-item:nth-child(1) .ranking-position {
    color: #fbbf24;
}

.ranking-item:nth-child(2) .ranking-position {
    color: #94a3b8;
}

.ranking-item:nth-child(3) .ranking-position {
    color: #cd7f32;
}

.ranking-avatar {
    font-size: 2rem;
}

.ranking-info {
    flex: 1;
}

.ranking-name {
    font-weight: 600;
    display: block;
}

.ranking-streak {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.ranking-minutes {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Membros */
.members-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.member-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
}

.member-avatar {
    font-size: 2rem;
}

.member-name {
    font-weight: 600;
}

/* Histórico */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.history-date-header {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    padding: var(--spacing-md) 0 var(--spacing-sm) 0;
    margin-top: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--surface-color);
    z-index: 10;
}

.history-date-header:first-child {
    margin-top: 0;
}

.history-item {
    padding: var(--spacing-md);
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-sm);
    transition: all 0.3s ease;
}

.history-item:last-child {
    margin-bottom: 0;
}

/* Destaque ao clicar em notificação */
.history-item.highlight-notification {
    background-color: rgba(99, 102, 241, 0.1);
    border-left-color: var(--primary-color);
    border-left-width: 6px;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    animation: pulse-highlight 0.6s ease-in-out;
}

@keyframes pulse-highlight {
    0%, 100% {
        box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(99, 102, 241, 0.3);
    }
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.history-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
}

.history-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.history-avatar {
    font-size: 1rem;
}

.history-duration {
    font-weight: 700;
    color: var(--primary-color);
}

.history-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.history-emoji {
    font-size: 1rem;
}

.history-description {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.history-comment {
    font-size: 0.9rem;
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(99, 102, 241, 0.05);
    border-left: 3px solid var(--primary-color);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.history-photo {
    width: 100%;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
}

/* Interações (Reações e Comentários) */
.study-interactions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.reactions-bar {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    flex: 1;
}

.btn-reaction {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
    position: relative;
}

.btn-reaction:hover {
    background-color: var(--bg-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-reaction.active {
    background-color: rgba(99, 102, 241, 0.1);
    border-color: var(--primary-color);
    font-weight: 600;
}

/* Contador de reações */
.reaction-count {
    font-size: 0.85rem;
    opacity: 0.8;
    font-weight: 500;
}

/* Tooltip das reações */
.reaction-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.95);
    color: white;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    margin-bottom: 10px;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: 100;
    min-width: 150px;
    max-width: 280px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.reaction-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.95);
}

.btn-reaction:hover .reaction-tooltip {
    opacity: 1;
}

.tooltip-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.tooltip-user:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.tooltip-user:not(:last-child) {
    margin-bottom: var(--spacing-xs);
}

.tooltip-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 600;
    color: white;
    flex-shrink: 0;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.tooltip-user span {
    font-size: 0.8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-comment {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--border-color);
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    color: var(--text-secondary);
    white-space: nowrap;
}

.btn-comment:hover {
    background-color: var(--bg-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Comentários */
.comments-section {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* ========================================
   CALENDÁRIO PESSOAL
   ======================================== */
.calendar-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.calendar-current-month {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: capitalize;
}

.btn-calendar-nav {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-calendar-nav:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-calendar-nav:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.calendar-month {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background-color: var(--bg-color);
    border-bottom: 2px solid var(--border-color);
}

.calendar-weekday {
    padding: var(--spacing-sm);
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    padding: 1px;
}

.calendar-day {
    background-color: var(--surface-color);
    min-height: 80px;
    padding: var(--spacing-xs);
    position: relative;
    cursor: default;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.calendar-day.empty {
    background-color: var(--bg-color);
    cursor: default;
}

.calendar-day.future {
    opacity: 0.5;
}

.calendar-day.today {
    background-color: rgba(99, 102, 241, 0.1);
}

.calendar-day.today .calendar-day-number {
    background-color: var(--primary-color);
    color: white;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.calendar-day.has-study {
    background-color: rgba(99, 102, 241, 0.05);
    border: 2px solid transparent;
    cursor: pointer;
}

.calendar-day.has-study:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2);
    transform: scale(1.02);
    z-index: 10;
}

.calendar-day-number {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.calendar-day-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    margin-top: auto;
}

.calendar-day-dots {
    color: var(--primary-color);
    font-size: 0.6rem;
    line-height: 1;
}

.calendar-day-minutes {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Modal de Detalhes do Dia */
.day-summary {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.day-summary p {
    margin: var(--spacing-xs) 0;
    font-size: 1rem;
}

.day-studies-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-height: 500px;
    overflow-y: auto;
}

.day-study-card {
    padding: var(--spacing-md);
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.day-study-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.study-time {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.time-badge {
    padding: 4px var(--spacing-sm);
    background-color: var(--bg-color);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.duration-badge {
    padding: 4px var(--spacing-sm);
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.day-study-card h4 {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.study-type {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: var(--spacing-xs) 0;
}

.study-description {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
}
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--spacing-xs);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tooltip-study:last-child {
    border-bottom: none;
}

.tooltip-study strong {
    color: var(--primary-light);
}

.tooltip-study span {
    font-size: 0.85rem;
}

.tooltip-duration {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.75rem !important;
}

.comment-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.comment-item:last-child {
    margin-bottom: 0;
}

.comment-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
}

.comment-content {
    flex: 1;
    min-width: 0;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    font-size: 0.85rem;
}

.comment-header strong {
    color: var(--text-primary);
}

.comment-time {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.comment-text {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.btn-delete-comment {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    margin-left: auto;
}

.btn-delete-comment:hover {
    background-color: var(--danger-color);
    color: white;
}

.comment-input-section {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
}

.comment-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    resize: vertical;
    margin-bottom: var(--spacing-sm);
}

.comment-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.comment-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
}

/* Ações de comentários (Responder, Reagir) */
.comment-actions-bar {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    align-items: center;
    position: relative;
}

.btn-comment-action {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.75rem;
    padding: 0;
    transition: color var(--transition-fast);
    font-weight: 500;
}

.btn-comment-action:hover {
    color: var(--primary-color);
}

/* Picker de reações inline */
.reaction-picker {
    display: none;
    gap: 4px;
    padding: 6px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 4px;
    z-index: 100;
}

.reaction-emoji-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 12px;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.reaction-emoji-btn:hover {
    background-color: var(--bg-secondary);
    transform: scale(1.2);
}

/* Reações em comentários */
.comment-reactions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.comment-reaction-btn {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

.comment-reaction-btn:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
}

.comment-reaction-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Respostas a comentários */
.comment-replies {
    margin-top: var(--spacing-sm);
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-md);
    border-left: 2px solid var(--border-color);
}

.comment-reply {
    margin-bottom: var(--spacing-sm);
}

.comment-reply .comment-avatar {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
}

/* Botão de toggle respostas */
.btn-toggle-replies {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.8rem;
    padding: var(--spacing-xs) 0;
    margin-top: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    transition: color var(--transition-fast);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-toggle-replies:hover {
    color: var(--primary-color);
}

.btn-toggle-replies .toggle-icon {
    font-size: 0.7rem;
    display: inline-block;
    transition: transform var(--transition-fast);
}

.btn-toggle-replies .toggle-icon.expanded {
    transform: rotate(180deg);
}

.reply-input-section {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

/* Emoji Picker para comentários */
.emoji-picker {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.emoji-picker-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.emoji-picker-btn:hover {
    background-color: var(--bg-secondary);
    transform: scale(1.1);
}

/* ========================================
   MODALS
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ========================================
   RESPONSIVIDADE
   ======================================== */

/* Tablets e telas médias (768px - 1024px) */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .groups-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Smartphones e telas pequenas (até 768px) */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    body {
        font-size: 14px;
    }

    .container {
        padding: 0 var(--spacing-md);
        padding-bottom: 100px; /* Espaço para bottom bar */
    }

    .screen-header {
        padding: var(--spacing-md);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .screen-header h2 {
        font-size: 1.5rem;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
        font-size: 1.2rem;
    }

    /* Autenticação */
    .auth-card {
        padding: var(--spacing-xl);
        max-width: 100%;
    }

    .auth-card h1 {
        font-size: 2rem;
    }

    .google-btn {
        padding: var(--spacing-md);
        font-size: 0.9rem;
    }

    /* Estatísticas */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .stat-card {
        padding: var(--spacing-md);
    }

    .stat-value {
        font-size: 2rem;
    }

    /* Grupos */
    .groups-list {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .group-card {
        padding: var(--spacing-md);
    }

    .group-name {
        font-size: 1.1rem;
    }

    .groups-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .groups-actions .btn {
        width: 100%;
        min-width: auto;
        justify-content: center;
    }

    /* Membros */
    .members-list {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .member-card {
        padding: var(--spacing-md);
    }

    /* Histórico */
    .history-list {
        gap: var(--spacing-md);
    }

    .history-date-header {
        font-size: 0.9rem;
        padding: var(--spacing-sm) 0;
    }

    .history-item {
        padding: var(--spacing-md);
    }

    .history-header {
        flex-wrap: wrap;
    }

    .history-actions {
        flex-wrap: nowrap;
    }

    .history-meta {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .history-photo {
        border-radius: var(--radius-md);
        max-height: 250px;
    }

    /* Interações */
    .study-interactions {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }

    .reactions-bar {
        width: 100%;
        gap: 4px;
    }

    .btn-reaction {
        padding: 4px var(--spacing-xs);
        font-size: 0.9rem;
    }

    .btn-comment {
        width: 100%;
        margin-top: var(--spacing-xs);
    }

    .comment-textarea {
        font-size: 1rem;
    }

    /* Cards destacados */
    .highlights-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .highlight-card {
        padding: var(--spacing-md);
    }

    .highlight-avatar-mini {
        width: 42px;
        height: 42px;
        font-size: 1rem;
    }

    .highlight-name-mini {
        font-size: 0.9rem;
    }

    .highlight-stat-mini {
        font-size: 0.85rem;
    }

    /* Ranking */
    .ranking-list {
        gap: var(--spacing-sm);
    }

    .ranking-item {
        padding: var(--spacing-md);
    }

    .ranking-position {
        font-size: 1.5rem;
        min-width: 40px;
    }

    .ranking-minutes {
        font-size: 1.2rem;
    }

    /* Banner de código do grupo */
    .group-code-banner {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
        padding: var(--spacing-md);
    }

    .group-code-display {
        font-size: 1.5rem;
    }

    /* Modais */
    .modal-content {
        width: 95%;
        max-width: 95vw;
        max-height: 85vh;
    }

    .modal-header {
        padding: var(--spacing-lg);
    }

    .modal-header h2 {
        font-size: 1.3rem;
    }

    .modal-body {
        padding: var(--spacing-lg);
    }

    .modal-footer {
        padding: var(--spacing-lg);
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .modal-footer .btn {
        width: 100%;
    }

    /* Formulários */
    .form-group label {
        font-size: 0.9rem;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 1rem;
        padding: var(--spacing-md);
    }

    .photo-options {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn-photo-option {
        width: 100%;
    }

    .photo-preview {
        max-height: 250px;
    }

    /* Câmera */
    .camera-modal-content {
        width: 98%;
        max-width: 98vw;
    }

    .camera-container video {
        max-height: 50vh;
    }

    .camera-controls {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .camera-controls .btn {
        flex: 1;
        min-width: 100px;
    }

    /* Avatar upload */
    .avatar-upload-section {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .avatar-preview {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }

    /* Dropdown menu */
    .user-menu {
        right: var(--spacing-sm);
        min-width: 180px;
    }

    /* Bottom bar */
    .bottom-bar {
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
    }

    .bottom-bar-btn {
        padding: var(--spacing-sm) var(--spacing-xs);
        min-width: 0;
        gap: 4px;
    }

    .bottom-bar-icon {
        font-size: 1.25rem;
    }

    .bottom-bar-label {
        font-size: 0.7rem;
    }

    /* FAB */
    .fab {
        bottom: 100px;
        right: 16px;
        width: 52px;
        height: 52px;
    }

    .fab-icon {
        font-size: 1.75rem;
    }
}

/* Smartphones pequenos (até 480px) */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 1rem;
        --spacing-xl: 1.25rem;
        --spacing-2xl: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .screen-header {
        padding: var(--spacing-sm);
    }

    .screen-header h2 {
        font-size: 1.3rem;
    }

    /* Autenticação */
    .auth-card {
        padding: var(--spacing-lg);
    }

    .auth-card h1 {
        font-size: 1.75rem;
    }

    .auth-tabs {
        flex-direction: column;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* Evita zoom automático no iOS */
    }

    /* Estatísticas */
    .stat-card {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .stat-icon {
        font-size: 1.75rem;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    /* Grupos */
    .group-card {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .group-gradient {
        width: 50px;
        height: 50px;
    }

    .group-info {
        min-width: 0;
    }

    .group-name {
        font-size: 1rem;
    }

    .group-meta {
        font-size: 0.75rem;
    }

    /* Destaque do grupo */
    .highlight-card {
        padding: var(--spacing-md);
    }

    .highlight-header h3 {
        font-size: 1rem;
    }

    .highlight-avatar {
        width: 45px;
        height: 45px;
        font-size: 1.2rem;
    }

    .highlight-name {
        font-size: 1rem;
    }

    .highlight-stat {
        font-size: 0.9rem;
    }

    /* Histórico */
    .history-date-header {
        font-size: 0.85rem;
        padding: var(--spacing-xs) 0;
    }

    .history-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .history-user {
        font-size: 0.9rem;
    }

    .history-avatar {
        font-size: 1rem;
    }

    .history-duration {
        font-size: 0.9rem;
    }

    .history-title {
        font-size: 0.95rem;
    }

    .history-meta {
        font-size: 0.75rem;
        gap: var(--spacing-xs);
    }

    .history-emoji {
        font-size: 0.9rem;
    }

    .history-description {
        font-size: 0.85rem;
    }

    .history-comment {
        font-size: 0.85rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    /* Interações */
    .btn-reaction {
        padding: 2px 6px;
        font-size: 0.85rem;
    }
    
    .comment-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.7rem;
    }
    
    .comment-header {
        font-size: 0.8rem;
    }
    
    .comment-time {
        font-size: 0.7rem;
    }

    .btn-comment {
        font-size: 0.85rem;
        padding: 4px var(--spacing-sm);
    }

    .comment-item {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .comment-text {
        font-size: 0.85rem;
    }

    .btn-icon-small {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    /* Ranking */
    .ranking-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .ranking-position {
        font-size: 1.3rem;
        min-width: 35px;
    }

    .ranking-avatar {
        font-size: 1.75rem;
    }

    .ranking-name {
        font-size: 0.95rem;
    }

    .ranking-minutes {
        font-size: 1.1rem;
    }

    /* Modais */
    .modal-content {
        width: 98%;
        max-height: 90vh;
    }

    .modal-header {
        padding: var(--spacing-md);
    }

    .modal-header h2 {
        font-size: 1.2rem;
    }

    .modal-body {
        padding: var(--spacing-md);
    }

    .modal-footer {
        padding: var(--spacing-md);
    }

    /* Câmera modal */
    .camera-controls {
        flex-direction: column;
    }

    .camera-controls .btn {
        width: 100%;
    }

    /* Bottom bar ajustado */
    .bottom-bar {
        padding: 6px var(--spacing-xs);
    }

    .bottom-bar-btn {
        padding: 6px 4px;
        gap: 2px;
    }

    .bottom-bar-icon {
        font-size: 1.1rem;
    }

    .bottom-bar-label {
        font-size: 0.65rem;
    }

    /* FAB menor */
    .fab {
        bottom: 90px;
        right: 12px;
        width: 48px;
        height: 48px;
    }

    .fab-icon {
        font-size: 1.5rem;
    }
}

/* Orientação landscape em dispositivos móveis */
@media (max-width: 768px) and (orientation: landscape) {
    .modal-content {
        max-height: 90vh;
        overflow-y: auto;
    }

    .camera-container video {
        max-height: 60vh;
    }

    .auth-card {
        max-width: 500px;
    }

    .screen-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Telas muito pequenas (até 360px) */
@media (max-width: 360px) {
    .screen-header h2 {
        font-size: 1.2rem;
    }

    .btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .group-name {
        font-size: 0.95rem;
    }

    .bottom-bar-label {
        display: none; /* Esconde labels em telas muito pequenas */
    }

    .bottom-bar-icon {
        font-size: 1.3rem;
    }
    
    .comment-avatar {
        width: 24px;
        height: 24px;
        font-size: 0.6rem;
    }
    
    .comment-header {
        font-size: 0.75rem;
        gap: 4px;
    }
    
    .comment-time {
        font-size: 0.65rem;
    }
    
    .comment-text {
        font-size: 0.8rem;
    }
}

/* ========================================
   BARRA DE RODAPÉ FIXA
   ======================================== */
.bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 90;
}

.bottom-bar-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    flex: 1;
    max-width: 150px;
    position: relative;
}

.bottom-bar-btn .badge {
    position: absolute;
    top: 0;
    right: 10px;
    background-color: var(--danger-color);
    color: white;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 999px;
    min-width: 18px;
    text-align: center;
}

.bottom-bar-btn:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.bottom-bar-btn:active {
    transform: translateY(0);
}

.bottom-bar-icon {
    font-size: 1.5rem;
}

.bottom-bar-label {
    font-size: 0.85rem;
    font-weight: 600;
}

/* ========================================
   BOTÃO FLUTUANTE (FAB)
   ======================================== */
.fab {
    position: fixed;
    bottom: 120px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 50%;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 85;
    transition: all var(--transition-base);
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.fab:active {
    transform: scale(0.95) rotate(90deg);
}

.fab-icon {
    font-size: 2rem;
    color: white;
    font-weight: 300;
    line-height: 1;
}

/* Ajustes mobile para FAB */
@media (max-width: 768px) {
    .fab {
        bottom: 120px;
        right: 16px;
        width: 52px;
        height: 52px;
    }

    .fab-icon {
        font-size: 1.75rem;
    }
}

/* ========================================
   UTILIDADES
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1.1rem;
}
/* ========================================
   NOTIFICAÇÕES
   ======================================== */

/* Badge de notificações */
.notification-btn {
    position: relative;
}

.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger-color);
    color: white;
    border-radius: 10px;
    padding: 2px 6px;
    font-size: 0.7rem;
    font-weight: 600;
    min-width: 18px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Notificações In-App */
#in-app-notifications {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 400px;
    pointer-events: none;
}

.in-app-notification {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 16px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
    animation: slideIn 0.3s ease;
    pointer-events: all;
    cursor: pointer;
    transition: all var(--transition-base);
    border-left: 4px solid var(--primary-color);
}

.in-app-notification:hover {
    transform: translateX(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.in-app-notification.fade-out {
    animation: fadeOut 0.3s ease;
    opacity: 0;
}

.in-app-notification-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.in-app-notification-content {
    flex: 1;
}

.in-app-notification-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.in-app-notification-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.in-app-notification-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.in-app-notification-close:hover {
    color: var(--text-primary);
}

/* Painel de Notificações */
.notification-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--surface-color);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    z-index: 9999;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
}

.notification-panel.active {
    right: 0;
}

.notification-panel-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notification-panel-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

.notification-panel-actions {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
}

.btn-text {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0;
    transition: color var(--transition-fast);
}

.btn-text:hover {
    color: var(--primary-hover);
}

.notification-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.notification-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.notification-item {
    padding: 16px 20px;
    display: flex;
    gap: 12px;
    cursor: pointer;
    transition: background var(--transition-fast);
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.notification-item:hover {
    background: var(--bg-color);
}

.notification-item.unread {
    background: rgba(99, 102, 241, 0.05);
}

.notification-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.notification-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.notification-time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.notification-unread-dot {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
}

/* Animações */
@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

/* Responsivo */
@media (max-width: 768px) {
    .notification-panel {
        width: 100%;
        right: -100%;
    }

    #in-app-notifications {
        left: 20px;
        right: 20px;
        max-width: none;
    }
}

/* ========================================
   PWA - BANNER DE INSTALAÇÃO
   ======================================== */

.pwa-banner {
    position: fixed;
    bottom: -200px;
    left: 0;
    right: 0;
    background: var(--surface-color);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
    padding: var(--spacing-md);
    z-index: 1000;
    transition: bottom 0.3s ease;
    border-top: 2px solid var(--primary-color);
}

.pwa-banner.show {
    bottom: 0;
}

.pwa-banner-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.pwa-banner-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
}

.pwa-banner-text {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.pwa-banner-text strong {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.pwa-banner-text span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.pwa-banner-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.btn-pwa-dismiss {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.btn-pwa-dismiss:hover {
    background: var(--bg-color);
    color: var(--text-primary);
}

.btn-pwa-install {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.btn-pwa-install:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.pwa-instructions {
    padding: var(--spacing-lg);
}

.pwa-instructions h3 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.pwa-instructions ol {
    margin-left: var(--spacing-lg);
    line-height: 1.8;
}

.pwa-instructions li {
    margin-bottom: var(--spacing-sm);
}

@media (max-width: 480px) {
    .pwa-banner-actions {
        width: 100%;
    }
    
    .btn-pwa-dismiss,
    .btn-pwa-install {
        flex: 1;
    }
}