/* --- VanFolio Unified Design System --- */

:root {
    /* Colors */
    --vf-bg-canvas: #F6F1E8;
    --vf-bg-elevated: #FBF7F1;
    --vf-bg-obsidian: #0F1115;
    --vf-bg-obsidian-soft: #171B21;

    --vf-surface-glass-light: rgba(255, 255, 255, 0.56);
    --vf-surface-glass-light-strong: rgba(255, 255, 255, 0.72);
    --vf-surface-glass-dark: rgba(20, 24, 29, 0.58);

    --vf-text-primary: #171717;
    --vf-text-secondary: #5F5A53;
    --vf-text-tertiary: #8A8278;
    --vf-text-on-dark: #F4EFE8;
    --vf-text-on-dark-muted: rgba(244, 239, 232, 0.72);

    --vf-accent-gold: #C59A3D;
    --vf-accent-gold-hover: #D7AA4A;
    --vf-accent-moss: #6E8B74;
    --vf-accent-moss-soft: #88A08C;

    --vf-border-light: rgba(255, 255, 255, 0.42);
    --vf-border-light-soft: rgba(23, 23, 23, 0.08);
    --vf-border-dark: rgba(255, 255, 255, 0.12);

    --vf-blur-soft: blur(16px);
    --vf-blur-medium: blur(24px);
    --vf-blur-strong: blur(32px);

    --vf-shadow-soft: 0 12px 40px rgba(20, 18, 16, 0.08);
    --vf-shadow-panel: 0 20px 60px rgba(20, 18, 16, 0.14);
    --vf-shadow-float: 0 28px 90px rgba(20, 18, 16, 0.20);

    --vf-highlight-top: inset 0 1px 0 rgba(255, 255, 255, 0.48);

    --vf-font-display: "EB Garamond", "Lora", serif;
    --vf-font-body: "Inter", "Segoe UI", sans-serif;

    --vf-text-hero: clamp(2.5rem, 4.2vw, 2.7rem);
    --vf-text-display-lg: clamp(2.4rem, 4vw, 3.25rem);
    --vf-text-display-md: clamp(1.75rem, 3vw, 2.5rem);
    --vf-text-title: 1.25rem;
    --vf-text-body-lg: 1.125rem;
    --vf-text-body: 1rem;
    --vf-text-small: 0.875rem;
    --vf-text-micro: 0.75rem;

    --vf-leading-display: 1.06;
    --vf-leading-body: 1.65;
    --vf-tracking-display: -0.04em;

    --vf-radius-sm: 12px;
    --vf-radius-md: 20px;
    --vf-radius-lg: 28px;
    --vf-radius-xl: 36px;

    --vf-ease-standard: cubic-bezier(0.22, 1, 0.36, 1);
    --vf-ease-soft: cubic-bezier(0.16, 1, 0.3, 1);
    --vf-dur-fast: 160ms;
    --vf-dur-base: 240ms;
    --vf-dur-slow: 420ms;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--vf-font-body);
    color: var(--vf-text-primary);
    background: var(--vf-bg-canvas);
    line-height: var(--vf-leading-body);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ── Navigation (VF Unified) ── */
.vf-nav {
    position: sticky;
    top: 0;
    z-index: 200;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: var(--vf-blur-medium);
    -webkit-backdrop-filter: var(--vf-blur-medium);
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 1px 0 rgba(23, 23, 23, 0.06);
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 40px;
    gap: 12px;
}

/* For landing page which is position fixed */
.vf-nav.fixed {
    position: fixed;
    left: 0;
    right: 0;
    gap: 32px;
}

.nav-logo {
    font-family: var(--vf-font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--vf-text-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.vf-nav.fixed .nav-logo {
    margin-right: 8px;
}

.brand-mark {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

/* Breadcrumb nav (subpages) */
.nav-sep {
    color: var(--vf-text-tertiary);
    font-size: 0.85rem;
    font-family: var(--vf-font-body);
}

.nav-page-title {
    font-size: 0.875rem;
    color: var(--vf-text-secondary);
    font-family: var(--vf-font-body);
    font-weight: 400;
}

.nav-back {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--vf-text-secondary);
    font-family: var(--vf-font-body);
    text-decoration: none;
    transition: color var(--vf-dur-fast);
}
.nav-back:hover { color: var(--vf-text-primary); }

/* Landing page specific nav elements */
/* Documentation Hero (shared for policies/changelog) */
.doc-hero {
    padding: 64px 40px 48px;
    border-bottom: 1px solid var(--vf-border-light-soft);
    background: var(--vf-bg-elevated);
}

.doc-hero-inner {
    max-width: 760px;
    margin: 0 auto;
    text-align: left;
}

.doc-eyebrow {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 600;
    color: var(--vf-text-tertiary);
    margin-bottom: 12px;
}

.doc-title {
    font-family: var(--vf-font-display);
    font-size: clamp(2.25rem, 5vw, 3rem);
    line-height: 1.06;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    color: var(--vf-text-primary);
}

.doc-meta {
    font-size: 0.875rem;
    color: var(--vf-text-tertiary);
    margin-bottom: 0;
}

/* Documentation Content Container */
.doc-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 56px 40px 96px;
}

.doc-section {
    margin-bottom: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--vf-border-light-soft);
}

.doc-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.doc-section h2 {
    font-family: var(--vf-font-display);
    font-size: 1.625rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    color: var(--vf-text-primary);
    line-height: 1.25;
}

.doc-section p {
    font-size: 0.9375rem;
    color: var(--vf-text-secondary);
    line-height: 1.75;
    margin-bottom: 16px;
}

.doc-section ul:not(.yes-list):not(.not-list) {
    margin: 16px 0;
    padding-left: 0;
    list-style: none;
}

.doc-section ul:not(.yes-list):not(.not-list) li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    font-size: 0.9375rem;
    color: var(--vf-text-secondary);
    line-height: 1.6;
}

.doc-section ul:not(.yes-list):not(.not-list) li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 6px;
    height: 6px;
    background: var(--vf-accent-gold);
    border-radius: 50%;
    opacity: 0.4;
}

/* Specialized Lists */
.yes-list, .not-list {
    list-style: none;
    padding: 0;
    margin: 16px 0;
}

.yes-list li, .not-list li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 12px;
    font-size: 0.9375rem;
    color: var(--vf-text-secondary);
    line-height: 1.6;
}

.yes-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4A7C59;
    font-weight: 700;
}

.not-list li::before {
    content: "✗";
    position: absolute;
    left: 0;
    color: #B85C38;
    font-weight: 700;
}

/* TL;DR card (optional) */
.tldr {
    background: rgba(197, 154, 61, 0.07);
    border: 1px solid rgba(197, 154, 61, 0.22);
    border-left: 3px solid var(--vf-accent-gold);
    border-radius: 8px;
    padding: 24px 28px;
    margin-bottom: 48px;
}

.tldr-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--vf-accent-gold);
    margin-bottom: 8px;
}

.tldr p {
    font-size: 1rem;
    color: var(--vf-text-primary);
    margin: 0;
    line-height: 1.6;
}

@media (max-width: 640px) {
    .doc-hero { padding: 40px 20px 32px; }
    .doc-body { padding: 40px 20px 64px; }
}

/* Documentation Footer */
.doc-footer {
    background: var(--vf-bg-elevated);
    border-top: 1px solid var(--vf-border-light-soft);
    padding: 48px 40px;
    text-align: center;
}

.doc-footer p {
    font-size: 0.8125rem;
    color: var(--vf-text-tertiary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.doc-footer a {
    color: var(--vf-text-secondary);
    text-decoration: none;
    transition: color var(--vf-dur-fast);
}

.doc-footer a:hover {
    color: var(--vf-text-primary);
}

.nav-links {
    display: flex;
    gap: 28px;
    flex: 1;
}

.nav-links a {
    font-size: var(--vf-text-small);
    color: var(--vf-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--vf-dur-fast);
}
.nav-links a:hover { color: var(--vf-text-primary); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 999px;
    border: none;
    font-size: var(--vf-text-body);
    font-weight: 600;
    font-family: var(--vf-font-body);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--vf-dur-fast) var(--vf-ease-standard);
}

.btn-primary {
    background: var(--vf-accent-gold);
    color: #1B160F;
    box-shadow: 0 4px 20px rgba(197, 154, 61, 0.22);
}
.btn-primary:hover {
    background: var(--vf-accent-gold-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(197, 154, 61, 0.32);
}

.btn-ghost {
    background: var(--vf-surface-glass-light);
    color: var(--vf-text-primary);
    border: 1px solid var(--vf-border-light-soft);
    backdrop-filter: var(--vf-blur-soft);
}
.btn-ghost:hover { background: var(--vf-surface-glass-light-strong); }

.btn-nav {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 20px;
    min-height: 36px;
    font-size: var(--vf-text-small);
    border-radius: 999px;
    background: var(--vf-accent-gold);
    color: #1B160F;
    font-weight: 700;
    font-family: var(--vf-font-body);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--vf-dur-fast) var(--vf-ease-standard);
}
.btn-nav:hover { 
    background: var(--vf-accent-gold-hover); 
    transform: translateY(-1px); 
}

/* Language Switcher */
.lang-switcher { position: relative; display: flex; align-items: center; }
.lang-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--vf-text-secondary);
    background: transparent;
    border: 1px solid var(--vf-border-light-soft);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--vf-dur-fast);
    white-space: nowrap;
}
.lang-btn:hover { color: var(--vf-text-primary); background: rgba(23, 23, 23, 0.04); }
.lang-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: var(--vf-bg-elevated);
    border: 1px solid var(--vf-border-light-soft);
    border-radius: 10px;
    box-shadow: var(--vf-shadow-soft);
    overflow: hidden;
    min-width: 140px;
    z-index: 300;
}
.lang-switcher.open .lang-dropdown { display: block; }
.lang-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 14px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--vf-text-secondary);
    cursor: pointer;
    transition: all var(--vf-dur-fast);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}
.lang-option:hover { background: rgba(197, 154, 61, 0.07); color: var(--vf-text-primary); }
.lang-option.active { color: var(--vf-accent-gold); }

/* Responsive */
@media (max-width: 1024px) {
    .vf-nav { gap: 20px; }
    .nav-links { display: none; }
}

@media (max-width: 640px) {
    .vf-nav { padding: 0 20px; }
    .nav-back { display: none; } /* Hide back button on very small screens to save space */
}