/* ========================================
   Base Styles — PlataformaCursosEnLinea
   Simple, clean, functional.
   ======================================== */

/* ─── Reset & Base ─────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Premium Dark Mode (Ultra-subtle purple tint, near neutral) */
    --color-bg: #0A090C;
    --color-surface: #141218;
    --color-surface-hover: #1D1A23;
    --color-border: rgba(130, 82, 255, 0.12);
    --color-primary: #8252FF;
    --color-primary-hover: #9c75ff;
    --color-text: #fdfcff;
    --color-text-muted: #a69bb8;
    --color-danger: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    --color-success: #10b981;
    --color-success-bg: rgba(16, 185, 129, 0.1);
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --glass-bg: rgba(31, 5, 75, 0.85);
    --glass-border: rgba(130, 82, 255, 0.2);
}

[data-theme="light"] {
    /* Light Mode - Based on #8252FF and White */
    --color-bg: #f8f6fc;
    --color-surface: #ffffff;
    --color-surface-hover: #f1ecfa;
    --color-border: #e4dcf5;
    --color-primary: #8252FF;
    --color-primary-hover: #6e40e6;
    --color-text: #1f054b;
    --color-text-muted: #6e5899;
    --color-danger: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    --color-success: #10b981;
    --color-success-bg: rgba(16, 185, 129, 0.1);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(130, 82, 255, 0.1);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100dvh;
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
    
    /* Page Transitions */
    opacity: 0;
    animation: fadeInPage 0.35s ease-out forwards;
}

body.page-exiting {
    opacity: 0 !important;
    transition: opacity 0.25s ease-out !important;
}

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

/* ─── Skeleton Loaders ─────────────────── */
.skeleton {
    background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-hover) 50%, var(--color-surface) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
    border-radius: var(--radius);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-card {
    height: 380px;
    width: 100%;
    border-radius: var(--radius);
    background: var(--color-surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.skeleton-img {
    height: 180px;
    width: 100%;
    border-radius: 0;
}

.skeleton-text {
    height: 16px;
    margin: 8px 20px;
    border-radius: 4px;
}

.skeleton-text.short {
    width: 40%;
}

.skeleton-text.medium {
    width: 70%;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-hover);
}

/* ─── Layout ───────────────────────────── */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-sm {
    max-width: 440px;
}

/* ─── Auth Layout (login/register) ─────── */
.auth-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 40px 36px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.auth-card.register-card {
    max-width: 800px;
}

@media (min-width: 768px) {
    .auth-card.register-card .register-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px 24px;
    }
    .auth-card.register-card .register-grid .form-group-full {
        grid-column: span 2;
    }
}

.auth-card h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.auth-card .subtitle {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 28px;
}

/* ─── Forms ────────────────────────────── */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--color-text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #4a5068;
}

/* ─── Password Wrapper ───────────────────── */
.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper input {
    padding-right: 40px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition);
}

.toggle-password:hover {
    color: var(--color-text);
}

.toggle-password:focus {
    outline: none;
}

.toggle-password svg {
    width: 18px;
    height: 18px;
}

/* ─── Buttons ──────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

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

.btn:active:not(:disabled) {
    transform: scale(0.96);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #8b5cf6);
    color: #fff;
    width: 100%;
    padding: 12px;
    box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.39);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-hover), #a78bfa);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.23);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-text-muted);
    background: var(--color-surface-hover);
}

.btn-danger {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-danger);
}

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

/* ─── Alerts ───────────────────────────── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    margin-bottom: 18px;
    display: none;
}

.alert.show {
    display: block;
}

.alert-error {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.btn-theme-toggle {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--color-text);
    transition: transform 0.2s, background var(--transition);
}

.btn-theme-toggle:hover {
    background: var(--color-surface-hover);
    transform: scale(1.1);
}

/* ─── Navbar ───────────────────────────── */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.navbar-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text);
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.brand-logo-light {
    display: none;
    height: 32px;
    width: auto;
}

.brand-logo-dark {
    display: block;
    height: 32px;
    width: auto;
}

html[data-theme="dark"] .brand-logo-light {
    display: block;
}

html[data-theme="dark"] .brand-logo-dark {
    display: none;
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.navbar-user-dropdown {
    position: relative;
    display: inline-block;
}

.navbar-user-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 0.9rem;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
    transition: background-color var(--transition);
}

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

.navbar-dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 8px;
    background-color: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: var(--shadow-hover);
    min-width: 200px;
    z-index: 100;
    overflow: hidden;
}

.navbar-dropdown-menu.show {
    display: flex;
    flex-direction: column;
}

.dropdown-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    word-break: break-all;
    background-color: rgba(0,0,0,0.02);
}
[data-theme='dark'] .dropdown-header {
    background-color: rgba(255,255,255,0.02);
}

.dropdown-item {
    padding: 12px 16px;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
}

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

.navbar-user {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ─── Dashboard ────────────────────────── */
.dashboard-header {
    padding: 40px 0 24px;
}

.dashboard-header h1 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.5px;
    margin-bottom: 4px;
}

.dashboard-header p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    box-shadow: var(--shadow);
}

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

.card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ─── Separator ────────────────────────── */
.separator {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

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

/* ─── Loading spinner ──────────────────── */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ─── Empty state ──────────────────────── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

.empty-state .icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.empty-state h3 {
    color: var(--color-text);
    margin-bottom: 6px;
}

/* ─── Side Panel ───────────────────────── */
.side-panel-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.8);
    display: flex; justify-content: flex-end; align-items: center;
    z-index: 1000;
    opacity: 0; pointer-events: none;
    transition: opacity 0.2s;
}
.side-panel-overlay.active { opacity: 1; pointer-events: all; }

.side-panel {
    background: var(--color-surface);
    width: 100%;
    max-width: 550px;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
    border: none;
    border-left: 1px solid var(--color-border);
    margin: 0;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    display: flex;
    flex-direction: column;
}
.side-panel-overlay.active .side-panel {
    transform: translateX(0);
}
.side-panel-header {
    display: flex; justify-content: space-between; align-items: center; 
    padding: 24px 32px 16px; border-bottom: 1px solid var(--color-border);
}
.side-panel-header h2 { margin: 0; font-size: 1.2rem; }
.close-panel-btn { background: none; border: none; color: var(--color-text); font-size: 1.5rem; cursor: pointer; padding: 0 8px; }

.side-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 24px 32px;
}
.side-panel-body::-webkit-scrollbar {
    width: 6px;
}
.side-panel-body::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.side-panel-footer {
    display: flex; gap: 10px;
    padding: 24px 32px;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

/* ─── Responsive ───────────────────────── */
@media (max-width: 600px) {
    .auth-card {
        padding: 28px 20px;
    }

    .dashboard-header h1 {
        font-size: 1.3rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}

/* ─── Admin Layout (Sidebar) ───────────── */
.admin-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

.admin-sidebar {
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 24px 0;
    transition: background-color var(--transition), border-color var(--transition);
}

.admin-brand {
    padding: 0 24px 24px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 24px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--color-text);
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0 16px;
    flex: 1;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius);
    transition: all var(--transition);
    text-decoration: none;
}

.sidebar-link:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text);
}

.sidebar-link.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
}

.sidebar-footer {
    padding: 24px 16px 0;
    border-top: 1px solid var(--color-border);
}

.admin-main {
    padding: 40px;
    overflow-y: auto;
}

@media (max-width: 900px) {
    .admin-layout {
        grid-template-columns: 1fr;
    }
    .admin-sidebar {
        position: relative;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }
    .admin-main {
        padding: 20px;
    }
}

/* ─── Terms of Service ─────────────────── */
.tos-container {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    height: 250px;
    overflow-y: auto;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.tos-container h3 {
    color: var(--color-text);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.tos-container p {
    margin-bottom: 8px;
}

.tos-container::-webkit-scrollbar {
    width: 6px;
}

.tos-container::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 18px;
}

.checkbox-group input[type="checkbox"] {
    margin-top: 3px;
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.checkbox-group input[type="checkbox"]:disabled {
    cursor: not-allowed;
}

.checkbox-group label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    user-select: none;
    cursor: pointer;
}
.checkbox-group input[type="checkbox"]:disabled + label {
    opacity: 0.6;
    cursor: not-allowed;
}