/* Variáveis e Design System */
:root {
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --primary-color: #00A3FF;
    --primary-hover: #008be5;
    --border-color: #e5e7eb;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --header-bg: #ffffff;
    
    /* Tags de prioridade */
    --priority-baixa: #10b981;
    --priority-media: #f59e0b;
    --priority-alta: #ef4444;
    
    --transition: all 0.3s ease;
    --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);
}

[data-theme="dark"] {
    --bg-color: #050505;
    --card-bg: #121212;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --border-color: #27272a;
    --header-bg: #0a0a0a;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: var(--transition);
    line-height: 1.5;
}

/* Header */
.app-header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
}

.logo-area h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.theme-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-btn:hover {
    background-color: var(--border-color);
}

/* Main Container */
.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Dashboard / Progress */
.dashboard {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.progress-info {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.progress-bar-bg {
    background-color: var(--border-color);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.5s ease;
    border-radius: 4px;
}

/* Form */
.task-form-section {
    margin-bottom: 2rem;
}

.task-form {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 1rem;
}

input, select {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
}

input:focus, select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 163, 255, 0.2);
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Filters */
.filters-section {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 0;
    position: relative;
}

.filter-btn.active {
    color: var(--primary-color);
}

.filter-btn.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

/* Task Board */
.task-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.task-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    animation: fadeIn 0.3s ease forwards;
}

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

.task-card.concluida {
    opacity: 0.6;
    background-color: var(--bg-color);
}

.task-card.concluida .task-desc {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.task-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.task-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.task-id {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background-color: var(--border-color);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
}

.task-desc {
    font-weight: 500;
    font-size: 1.1rem;
}

.task-tags {
    display: flex;
    gap: 0.5rem;
}

.tag {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.tag-category {
    background-color: rgba(0, 163, 255, 0.1);
    color: var(--primary-color);
}

.tag-priority-baixa { background-color: rgba(16, 185, 129, 0.1); color: var(--priority-baixa); }
.tag-priority-media { background-color: rgba(245, 158, 11, 0.1); color: var(--priority-media); }
.tag-priority-alta { background-color: rgba(239, 68, 68, 0.1); color: var(--priority-alta); }

.task-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.action-btn.btn-check:hover { background-color: var(--success-color); color: white; border-color: var(--success-color); }
.action-btn.btn-delete:hover { background-color: var(--danger-color); color: white; border-color: var(--danger-color); }

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

/* Responsividade */
@media (max-width: 768px) {
    .task-form {
        grid-template-columns: 1fr;
    }
}