/* ========== RESET E VARIÁVEIS ========== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Tema Claro */
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8eef4;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --accent: #667eea;
    --accent-hover: #5568d3;
    --success: #48bb78;
    --danger: #f56565;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

[data-theme="dark"] {
    /* Tema Escuro */
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-tertiary: #252d3a;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    --accent: #805ad5;
    --accent-hover: #6b46c1;
    --success: #68d391;
    --danger: #fc8181;
    --border: #4a5568;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    --gradient: linear-gradient(135deg, #805ad5 0%, #d53f8c 100%);
}


/* ========== ESTILOS GLOBAIS ========== */

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
    line-height: 1.6;
}

.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}


/* ========== HEADER ========== */

.header {
    margin-bottom: 30px;
    animation: slideDown 0.5s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    font-size: 2.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s infinite;
}

.header h1 {
    font-size: 2rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.3rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--accent);
    color: white;
    transform: rotate(15deg) scale(1.1);
    border-color: var(--accent);
}


/* ========== ESTATÍSTICAS ========== */

.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
    animation: fadeIn 0.6s ease;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 4px 6px var(--shadow);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px var(--shadow-lg);
}

.stat-card i {
    font-size: 2rem;
    color: var(--accent);
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}


/* ========== INPUT DE TAREFA ========== */

.task-input-section {
    margin-bottom: 30px;
    animation: fadeIn 0.7s ease;
}

.input-wrapper {
    display: flex;
    gap: 10px;
    background: var(--bg-secondary);
    padding: 10px;
    border-radius: 16px;
    box-shadow: 0 4px 12px var(--shadow);
    border: 2px solid var(--border);
    transition: all 0.3s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 4px 20px var(--shadow-lg);
    transform: translateY(-2px);
}

.input-icon {
    color: var(--text-muted);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    padding: 0 10px;
}

#taskInput {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-primary);
    padding: 12px;
    outline: none;
}

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

.add-btn {
    background: var(--gradient);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.add-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px var(--shadow-lg);
}

.add-btn:active {
    transform: scale(0.98);
}


/* ========== CONTROLES E FILTROS ========== */

.controls-section {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    animation: fadeIn 0.8s ease;
}

.search-wrapper {
    flex: 1;
    min-width: 250px;
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 0 15px;
    transition: all 0.3s ease;
}

.search-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-icon {
    color: var(--text-muted);
    margin-right: 10px;
}

#searchInput {
    flex: 1;
    border: none;
    background: transparent;
    padding: 12px 5px;
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
}

#searchInput::placeholder {
    color: var(--text-muted);
}

.filter-buttons {
    display: flex;
    gap: 10px;
    background: var(--bg-secondary);
    padding: 5px;
    border-radius: 12px;
    border: 2px solid var(--border);
}

.filter-btn {
    background: transparent;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

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

.filter-btn.active {
    background: var(--accent);
    color: white;
}


/* ========== LISTA DE TAREFAS ========== */

.tasks-container {
    flex: 1;
    margin-bottom: 30px;
}

.task-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.task-item {
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 18px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease;
    cursor: pointer;
}

.task-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px var(--shadow);
    border-color: var(--accent);
}

.task-item.completed {
    opacity: 0.7;
    border-color: var(--success);
}

.task-checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.task-checkbox i {
    display: none;
    color: white;
    font-size: 0.8rem;
}

.task-item.completed .task-checkbox {
    background: var(--success);
    border-color: var(--success);
}

.task-item.completed .task-checkbox i {
    display: block;
}

.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.task-text {
    color: var(--text-primary);
    font-size: 1rem;
    word-break: break-word;
    transition: all 0.3s ease;
}

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

.task-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
}

.task-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.task-item:hover .task-actions {
    opacity: 1;
}

.task-btn {
    background: transparent;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.task-btn.edit-btn {
    color: var(--accent);
}

.task-btn.edit-btn:hover {
    background: var(--accent);
    color: white;
}

.task-btn.delete-btn {
    color: var(--danger);
}

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


/* ========== ESTADO VAZIO ========== */

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
    display: none;
}

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

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1rem;
}


/* ========== AÇÕES ========== */

.actions-section {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
}

.clear-btn {
    background: var(--bg-secondary);
    color: var(--danger);
    border: 2px solid var(--border);
    padding: 12px 25px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.clear-btn:hover {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
    transform: scale(1.05);
}

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

.clear-btn:disabled:hover {
    transform: none;
    background: var(--bg-secondary);
    color: var(--danger);
}


/* ==