/* ==========================================================================
   MEDLEY-BENCH Website Stylesheet
   Design system: KI-SMILE / TrustCV family - Refined
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600;9..40,700&family=DM+Mono:wght@400;500&family=Playfair+Display:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/icon?family=Material+Icons');

:root {
    /* KI Brand & Semantic Base */
    --ki-brand-plum: #870052;
    --ki-brand-orange: #FF876F;

    /* Typography Scale */
    --md-sys-typescale-display-large: 3.5rem;
    --md-sys-typescale-display-medium: 2.8rem;
    --md-sys-typescale-headline-large: 2rem;
    --md-sys-typescale-headline-medium: 1.75rem;
    --md-sys-typescale-title-large: 1.375rem;
    --md-sys-typescale-title-medium: 1.125rem;
    --md-sys-typescale-body-large: 1rem;
    --md-sys-typescale-body-medium: 0.875rem;

    /* Additional UI scales */
    --md-sys-typescale-body-medium-size: 0.875rem;
    --md-sys-typescale-title-medium-size: 1.125rem;
    --md-sys-typescale-label-large-size: 0.875rem;
    --md-sys-typescale-label-small-size: 0.75rem;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 64px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Light Theme (default) ---------- */
[data-theme="light"] {
    --bg-main: #ffffff;
    --bg-surface: #fdf8fb;
    --bg-surface-variant: #f5edf3;
    --text-main: #1a0a16;
    --text-muted: #665566;
    --border-color: #eddbe4;

    --ki-plum: #870052;
    --ki-orange: #e56550;
    --ki-grey: #665566;
    --ki-dark-plum: #4f0433;

    --md-sys-color-surface: #fdf8fb;
    --md-sys-color-surface-variant: #f5edf3;
    --md-sys-color-outline-variant: #eddbe4;

    --section-white: #ffffff;
    --section-orange: #fdf1ed;
    --section-blue: #f1f5f9;
    --section-dark: #4f0433;

    --navbar-bg: rgba(255, 255, 255, 0.95);
    --card-bg: #ffffff;
    --footer-bg: #4f0433;

    --md-sys-elevation-1: 0 1px 3px rgba(0, 0, 0, 0.1);
    --md-sys-elevation-2: 0 4px 6px rgba(0, 0, 0, 0.05);

    /* Ability Colors */
    --color-mon: #1E40AF;
    --color-ctrl: #92400E;
    --color-eval: #B91C1C;
    --color-sreg: #166534;
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
    --bg-main: #0f050c;
    --bg-surface: #1a0a16;
    --bg-surface-variant: #251221;
    --text-main: #f5edf3;
    --text-muted: #a08898;
    --border-color: rgba(255, 135, 111, 0.15);
    
    --ki-plum: #d088b8;
    --ki-orange: #FF876F;
    --ki-grey: #a08898;
    --ki-dark-plum: #f5edf3;

    --md-sys-color-surface: #1a0a16;
    --md-sys-color-surface-variant: #251221;
    --md-sys-color-outline-variant: rgba(255, 135, 111, 0.15);

    --section-white: #1a0a16;
    --section-orange: #251221;
    --section-blue: #150a1f;
    --section-dark: #090308;

    --navbar-bg: rgba(15, 5, 12, 0.95);
    --card-bg: #251221;
    --footer-bg: #090308;

    --md-sys-elevation-1: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --md-sys-elevation-2: 0 10px 15px -3px rgba(0, 0, 0, 0.4);

    /* Ability Colors */
    --color-mon: #4A9FE8;
    --color-ctrl: #F0A830;
    --color-eval: #FF876F;
    --color-sreg: #9AD066;
}

/* ==========================================================================
   Base Reset
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    letter-spacing: -0.01em;
}

h1, h2, .playfair {
    font-family: 'Playfair Display', serif;
}

h1 { font-size: var(--md-sys-typescale-display-large); font-weight: 500; line-height: 1.1; margin-bottom: var(--spacing-lg); }
h2 { font-size: var(--md-sys-typescale-headline-large); font-weight: 500; margin-bottom: var(--spacing-md); }
h3 { font-size: var(--md-sys-typescale-title-large); font-weight: 600; color: var(--ki-plum); margin-bottom: var(--spacing-sm); }

p { margin-bottom: var(--spacing-md); opacity: 0.9; }
a { color: var(--ki-plum); text-decoration: none; transition: var(--transition); }
a:hover { opacity: 0.8; }

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
    background-color: var(--navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--md-sys-elevation-1);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 72px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    font-family: 'DM Mono', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ki-plum) !important;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-menu a {
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.9rem;
    opacity: 0.85;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--ki-plum);
    opacity: 1;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 28px;
    cursor: pointer;
}

.theme-toggle {
    background: var(--bg-surface-variant);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
}

.nav-github {
    background: var(--ki-plum);
    color: white !important;
    padding: 8px 18px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
    padding: calc(var(--spacing-xxl) * 1.5) 0;
    text-align: center;
    background: radial-gradient(circle at top right, var(--section-blue), transparent 70%),
                radial-gradient(circle at bottom left, var(--section-orange), transparent 70%);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ==========================================================================
   Sections & Layout
   ========================================================================== */

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-lg); }
section { padding: var(--spacing-xxl) 0; }

.section-white { background: var(--section-white); }
.section-orange { background: var(--section-orange); }
.section-blue { background: var(--section-blue); }
.section-dark { background: var(--section-dark); color: white; }

.section-heading { text-align: center; margin-bottom: var(--spacing-xxl); }
.section-subheading { text-align: center; color: var(--text-muted); margin-top: -32px; margin-bottom: 48px; }

/* ==========================================================================
   Cards & Grids
   ========================================================================== */

.card-row, .features-grid, .findings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card, .media-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    box-shadow: var(--md-sys-elevation-1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--md-sys-elevation-2);
    border-color: var(--ki-plum);
}

.card-icon { font-size: 48px; color: var(--ki-plum); margin-bottom: var(--spacing-md); display: block; }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn-primary, .btn-secondary {
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-primary {
    background: var(--ki-plum);
    color: white !important;
    box-shadow: 0 4px 12px rgba(135, 0, 82, 0.2);
}

.btn-primary:hover { transform: scale(1.03); box-shadow: 0 6px 16px rgba(135, 0, 82, 0.3); }

.btn-secondary {
    background: var(--bg-surface-variant);
    color: var(--text-main) !important;
    border: 1px solid var(--border-color);
}

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

/* ==========================================================================
   Tables
   ========================================================================== */

.table-wrapper {
    overflow-x: auto;
    background: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--md-sys-elevation-1);
    margin: var(--spacing-lg) 0;
}

table { width: 100%; border-collapse: collapse; }
th { background: var(--bg-surface-variant); padding: 16px; text-align: left; font-weight: 600; color: var(--ki-plum); border-bottom: 1px solid var(--border-color); }
td { padding: 14px 16px; border-bottom: 1px solid var(--border-color); }
tbody tr:hover { background: var(--bg-surface-variant); }

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: var(--footer-bg);
    color: white;
    padding: var(--spacing-xxl) 0;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-column {
    padding: 0 var(--spacing-xs);
}

.footer-brand { font-family: 'DM Mono', monospace; font-size: 1.5rem; margin-bottom: var(--spacing-md); display: block; color: white !important; padding-bottom: var(--spacing-md); }
.footer h4 { color: var(--ki-orange); margin-bottom: var(--spacing-md); }
.footer p { line-height: 1.8; margin-bottom: var(--spacing-sm); }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { color: rgba(255,255,255,0.7); }
.footer a:hover { color: white; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-menu {
        position: fixed;
        top: 72px; left: 0; right: 0; bottom: 0;
        background: var(--bg-main);
        flex-direction: column;
        padding: var(--spacing-xl);
        transform: translateX(100%);
        transition: var(--transition);
        z-index: 999;
    }
    .nav-menu.active { transform: translateX(0); }
    .hero-actions { flex-direction: column; }
    .footer-container { grid-template-columns: 1fr; text-align: center; }
}

/* Utils */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--spacing-md); }
.stat-card { background: var(--card-bg); padding: var(--spacing-lg); border-radius: 16px; text-align: center; border: 1px solid var(--border-color); }
.stat-value { font-family: 'DM Mono', monospace; font-size: 2rem; color: var(--ki-plum); display: block; }
.stat-label { color: var(--text-muted); font-size: 0.9rem; }

.media-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--spacing-lg); }
.media-header { display: flex; gap: var(--spacing-md); margin-bottom: var(--spacing-md); }
.media-icon { font-size: 48px; color: var(--ki-plum); }
.media-meta { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0; }

pre { background: var(--section-dark); padding: var(--spacing-lg); border-radius: 12px; overflow-x: auto; color: var(--ki-orange); }

/* ==========================================================================
   Utility Classes & Components
   ========================================================================== */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--ki-plum);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--md-sys-elevation-2);
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    border: none;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    background: var(--ki-brand-plum);
}

/* Responsive Table Scroll Indicator */
.table-wrapper {
    position: relative;
}

.table-wrapper::after {
    content: 'scroll \u2192';
    position: absolute;
    right: 12px;
    bottom: 8px;
    font-size: 10px;
    color: var(--text-muted);
    opacity: 0.6;
    display: none;
    pointer-events: none;
}

@media (max-width: 768px) {
    .table-wrapper::after {
        display: block;
    }
}

/* Responsive Assets */
img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

.figure-container, figure {
    width: 100%;
    margin: var(--spacing-lg) 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.figure-container img, figure img {
    min-width: 600px; /* Ensure images stay readable on small screens by allowing scroll */
    max-width: none;
}

@media (min-width: 1024px) {
    .figure-container img, figure img {
        min-width: 0;
        max-width: 100%;
    }
}

.figure-caption, figcaption {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
    padding: 0 var(--spacing-md);
}

/* Specific pages */
.page-header { padding: var(--spacing-xxl) 0; background: var(--section-orange); }
.page-title { margin-bottom: 10px; }
.page-subtitle { color: var(--text-muted); }

.method-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 16px; padding: var(--spacing-xl); margin-top: var(--spacing-lg); }

.tier-badge { padding: 4px 10px; border-radius: 10px; font-weight: 700; font-size: 0.75rem; text-transform: uppercase; }
.tier-B { background: #1976D2; color: white; }
.tier-C { background: #757575; color: white; }
.tier-D { background: #D84315; color: white; }