/* Sistema de diseño propio (Modo Día/Campo por defecto + Modo Noche). Sin dependencias externas. */
:root,
html[data-tema="claro"] {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    --bg-app: #f4f6fb;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --bg-input: #ffffff;
    --bg-subtle: #eef2f8;
    --bg-thead: #f1f5f9;
    --border-color: #d8e0ec;
    --border-color-hover: #94a3b8;

    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-glow: rgba(79, 70, 229, 0.2);
    --primary-soft: rgba(79, 70, 229, 0.1);

    --secondary: #7c3aed;
    --success: #15803d;
    --success-soft: rgba(21, 128, 61, 0.12);
    --warning: #b45309;
    --warning-soft: rgba(180, 83, 9, 0.12);
    --danger: #be123c;
    --danger-soft: rgba(190, 18, 60, 0.1);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);

    --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
}

html[data-tema="oscuro"] {
    --bg-app: #0d1117;
    --bg-sidebar: #161b22;
    --bg-card: rgba(22, 27, 34, 0.88);
    --bg-card-hover: rgba(33, 38, 45, 0.92);
    --bg-input: rgba(0, 0, 0, 0.28);
    --bg-subtle: rgba(255, 255, 255, 0.05);
    --bg-thead: #1f242c;
    --border-color: rgba(240, 246, 252, 0.12);
    --border-color-hover: rgba(240, 246, 252, 0.24);

    --primary: hsl(250, 85%, 68%);
    --primary-hover: hsl(250, 85%, 58%);
    --primary-glow: rgba(111, 76, 255, 0.35);
    --primary-soft: rgba(111, 76, 255, 0.16);

    --secondary: hsl(280, 80%, 62%);
    --success: hsl(140, 65%, 50%);
    --success-soft: rgba(35, 190, 90, 0.15);
    --warning: hsl(40, 85%, 60%);
    --warning-soft: rgba(230, 170, 60, 0.15);
    --danger: hsl(350, 78%, 58%);
    --danger-soft: rgba(220, 38, 70, 0.14);

    --text-primary: #f0f6fc;
    --text-secondary: #9aa4b2;
    --text-muted: #6e7681;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
}

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: clip;
    -webkit-tap-highlight-color: transparent;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 272px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1.25rem;
    transition: var(--transition-normal);
    z-index: 100;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 2rem;
    padding: 0 0.25rem;
}

.brand-logo {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.brand-name {
    font-size: 1.12rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    min-height: 44px;
    box-sizing: border-box;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: var(--transition-fast);
    border: 1px solid transparent;
}

.nav-item-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
    border-color: var(--border-color);
}

.nav-item-link.active {
    color: var(--primary);
    background: var(--primary-soft);
    border-color: var(--primary-glow);
    font-weight: 600;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 2rem 2.5rem;
    overflow-y: auto;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
    margin-top: 0.75rem;
}

.dashboard-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.dashboard-card:hover {
    transform: translateY(-3px);
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-soft);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin-bottom: 1rem;
    transition: var(--transition-fast);
}

.dashboard-card:hover .card-icon {
    background: var(--primary);
    color: white;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.45;
}

.form-input {
    background-color: var(--bg-input);
    border: 1.5px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 11px 14px;
    min-height: 44px;
    font-size: 1rem;
    transition: var(--transition-fast);
    width: 100%;
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@media (max-width: 992px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        padding: 0.75rem 1rem;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .main-content {
        padding: 1rem;
    }
}