/* ============================================
   RESET E VARIÁVEIS CSS
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Cores principais - Light Mode */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --secondary-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --accent-color: #8b5cf6;
    
    /* Cores neutras - Light Mode */
    --bg-color: #f8fafc;
    --bg-secondary: #f1f5f9;
    --card-bg: #ffffff;
    --card-bg-hover: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --completed-text: #94a3b8;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-tech: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* Espaçamentos */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Bordas */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Transições */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
    /* Cores principais - Dark Mode */
    --primary-color: #818cf8;
    --primary-hover: #6366f1;
    --primary-light: #a5b4fc;
    --secondary-color: #34d399;
    --secondary-hover: #10b981;
    --danger-color: #f87171;
    --danger-hover: #ef4444;
    --warning-color: #fbbf24;
    --accent-color: #a78bfa;
    
    /* Cores neutras - Dark Mode */
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --card-bg: #1e293b;
    --card-bg-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #334155;
    --border-hover: #475569;
    --completed-text: #64748b;
    
    /* Gradientes - Dark Mode */
    --gradient-primary: linear-gradient(135deg, #1e293b 0%, #334155 50%, #475569 100%);
    --gradient-secondary: linear-gradient(135deg, #7c3aed 0%, #a855f7 50%, #ec4899 100%);
    --gradient-tech: linear-gradient(135deg, #1e293b 0%, #334155 50%, #475569 100%);
    
    /* Sombras - Dark Mode */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(129, 140, 248, 0.4);
}

/* ============================================
   ESTILOS GERAIS
   ============================================ */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--gradient-tech);
    background-attachment: fixed;
    min-height: 100vh;
    padding: var(--spacing-md);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background var(--transition-slow);
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.theme-toggle-container {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1000;
}

.theme-toggle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary-color);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-lg);
    animation: fadeIn 0.5s ease;
    position: relative;
    z-index: 1;
}

[data-theme="dark"] .container {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animação de entrada do container */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   HEADER
   ============================================ */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 800;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] header h1 {
    color: var(--text-primary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.subtitle {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
}

[data-theme="dark"] .subtitle {
    color: var(--text-secondary);
    opacity: 1;
}

/* ============================================
   SEÇÃO DE INPUT
   ============================================ */
.task-input-section {
    margin-bottom: var(--spacing-lg);
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

/* Seção de agendamento */
.schedule-section {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-top: var(--spacing-sm);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.schedule-section:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.schedule-checkbox-row {
    margin-bottom: var(--spacing-sm);
}

.schedule-checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
}

.schedule-checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
    transition: transform var(--transition-fast);
}

.schedule-checkbox-label input[type="checkbox"]:hover {
    transform: scale(1.1);
}

.schedule-fields {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    animation: fadeIn 0.3s ease;
}

.schedule-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.schedule-field {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.schedule-field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.schedule-field input[type="date"],
.schedule-field input[type="time"] {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    outline: none;
    font-family: inherit;
    color: var(--text-primary);
}

.schedule-field input[type="date"]:focus,
.schedule-field input[type="time"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1), var(--shadow-sm);
    transform: translateY(-1px);
}

#taskInput {
    flex: 1;
    min-width: 200px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-fast);
    outline: none;
    color: var(--text-primary);
}

#taskInput:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1), var(--shadow-md);
    transform: translateY(-1px);
}

#taskInput::placeholder {
    color: var(--text-secondary);
}

.btn-add {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-add::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-add:hover::before {
    left: 100%;
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.btn-add span {
    font-size: 1.3rem;
    font-weight: 300;
}

/* ============================================
   SEÇÃO DE ESTATÍSTICAS
   ============================================ */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

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

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

/* ============================================
   SEÇÃO DE TAREFAS
   ============================================ */
.tasks-section {
    margin-top: var(--spacing-lg);
}

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

.tasks-section h2 {
    font-size: 1.3rem;
    margin: 0;
    color: var(--text-primary);
}

.tasks-list {
    list-style: none;
}

/* ============================================
   SISTEMA DE ABAS
   ============================================ */
.tabs-container {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0;
}

.tab-button {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    position: relative;
    margin-bottom: -2px;
}

.tab-button::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.tab-button:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.tab-button.active {
    color: var(--primary-color);
    background: transparent;
}

.tab-button.active::after {
    transform: scaleX(1);
}

.tab-badge {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    min-width: 24px;
    text-align: center;
    transition: all var(--transition-fast);
}

.tab-button.active .tab-badge {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

/* ============================================
   ITEM DE TAREFA
   ============================================ */
.task-item {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
    animation: slideIn 0.3s ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.task-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-primary);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.task-item:hover::before {
    transform: scaleY(1);
}

/* Animação de entrada do item */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Animação de saída do item */
@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
        max-height: 100px;
    }
    to {
        opacity: 0;
        transform: translateX(20px);
        max-height: 0;
        margin-bottom: 0;
        padding-top: 0;
        padding-bottom: 0;
    }
}

.task-item.removing {
    animation: slideOut 0.3s ease forwards;
}

.task-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
    background: var(--card-bg-hover);
}

/* Checkbox customizado */
.task-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--secondary-color);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.task-checkbox:hover {
    transform: scale(1.15);
    filter: brightness(1.2);
}

/* Texto da tarefa */
.task-text {
    flex: 1;
    font-size: 1rem;
    color: var(--text-primary);
    word-break: break-word;
    transition: all var(--transition-normal);
}

/* Tarefa concluída */
.task-item.completed {
    background: var(--bg-color);
    border-color: var(--border-color);
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--completed-text);
    opacity: 0.7;
}

/* Informações de data/hora da tarefa */
.task-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
}

.task-main-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.task-meta .task-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.task-meta .task-time {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Indicadores de prazo */
.task-item.urgent {
    border-left: 4px solid var(--danger-color);
    background: linear-gradient(90deg, rgba(239, 68, 68, 0.1) 0%, var(--card-bg) 10%);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.2);
}

.task-item.upcoming {
    border-left: 4px solid var(--warning-color);
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.1) 0%, var(--card-bg) 10%);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
}

[data-theme="dark"] .task-item.urgent {
    background: linear-gradient(90deg, rgba(239, 68, 68, 0.2) 0%, var(--card-bg) 10%);
}

[data-theme="dark"] .task-item.upcoming {
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.2) 0%, var(--card-bg) 10%);
}

/* Badge de status */
.task-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: auto;
}

.task-badge.urgent {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2) 0%, rgba(239, 68, 68, 0.1) 100%);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.task-badge.upcoming {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.2) 0%, rgba(245, 158, 11, 0.1) 100%);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Container de ações da tarefa */
.task-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

/* Botão de editar */
.btn-edit {
    background: var(--gradient-primary);
    color: white;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.btn-edit:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-edit:active {
    transform: scale(0.95);
}

/* Botão de remover */
.btn-remove {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-hover) 100%);
    color: white;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    font-weight: 300;
    box-shadow: var(--shadow-sm);
}

.btn-remove:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-md), 0 0 15px rgba(239, 68, 68, 0.4);
}

.btn-remove:active {
    transform: scale(0.95);
}

/* Modo de edição */
.task-item.editing {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), var(--shadow-lg), var(--shadow-glow);
    background: var(--card-bg-hover);
}

.task-edit-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
}

.edit-text-input {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    outline: none;
}

.edit-text-input {
    background: var(--card-bg);
    color: var(--text-primary);
}

.edit-text-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1), var(--shadow-sm);
}

.edit-datetime-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xs);
}

.edit-date-input,
.edit-time-input {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    outline: none;
}

.edit-date-input,
.edit-time-input {
    background: var(--card-bg);
    color: var(--text-primary);
}

.edit-date-input:focus,
.edit-time-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1), var(--shadow-sm);
}

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

.btn-save {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-hover) 100%);
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.btn-save:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 15px rgba(16, 185, 129, 0.3);
}

.btn-cancel {
    background: var(--text-secondary);
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-cancel:hover {
    background: #6c7a7d;
    transform: translateY(-1px);
}

/* ============================================
   ESTADO VAZIO
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    display: none;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

.empty-state.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

.empty-state:hover {
    border-color: var(--primary-color);
    background: var(--card-bg-hover);
}

.empty-state p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.empty-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

/* ============================================
   RESPONSIVIDADE (MOBILE FIRST)
   ============================================ */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
    }
    
    .container {
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .input-wrapper {
        flex-direction: column;
    }
    
    #taskInput {
        width: 100%;
    }
    
    .btn-add {
        width: 100%;
        justify-content: center;
    }
    
    .schedule-row {
        grid-template-columns: 1fr;
    }
    
    .schedule-checkbox-label {
        font-size: 0.9rem;
    }
    
    .task-item {
        flex-wrap: wrap;
    }
    
    .task-main-content {
        min-width: 100%;
    }
    
    .task-meta {
        font-size: 0.8rem;
    }
    
    .edit-datetime-container {
        grid-template-columns: 1fr;
    }
    
    .edit-actions {
        flex-direction: column;
    }
    
    .btn-save,
    .btn-cancel {
        width: 100%;
    }
    
    .tabs-container {
        flex-direction: column;
        gap: 0;
    }
    
    .tab-button {
        border-bottom: 2px solid var(--border-color);
        border-left: 3px solid transparent;
        margin-bottom: 0;
    }
    
    .tab-button.active {
        border-left-color: var(--primary-color);
        border-bottom-color: var(--border-color);
    }
    
    .stats-section {
        grid-template-columns: 1fr;
    }
    
    .task-item {
        padding: var(--spacing-sm);
    }
    
    .task-text {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.3rem;
    }
    
    .subtitle {
        font-size: 0.85rem;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
}

/* ============================================
   ANIMAÇÕES ADICIONAIS
   ============================================ */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.stat-value.updating {
    animation: pulse 0.3s ease;
}