/* ============================================================
   Enhanced Design System for Kevin's Knowledge Hub
   Layered on top of Strata template (main.css)
   v3.0 — "Luminous Depth" redesign
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Design Tokens --- */
:root {
    /* Primary palette */
    --kh-primary: #49bf9d;
    --kh-primary-dark: #3a9d7a;
    --kh-primary-light: #6cd4b2;
    --kh-primary-glow: rgba(73, 191, 157, 0.35);
    --kh-primary-subtle: rgba(73, 191, 157, 0.08);

    /* Accents */
    --kh-accent: #818cf8;
    --kh-accent2: #f472b6;
    --kh-warm: #fbbf24;
    --kh-success: #34d399;
    --kh-error: #fb7185;

    /* Surfaces — layered depth */
    --kh-bg-deep: #080c15;
    --kh-bg-surface: #0e1221;
    --kh-bg-card: rgba(255, 255, 255, 0.03);
    --kh-bg-glass: rgba(255, 255, 255, 0.05);
    --kh-bg-glass-hover: rgba(255, 255, 255, 0.08);

    /* Borders */
    --kh-border: rgba(255, 255, 255, 0.07);
    --kh-border-hover: rgba(73, 191, 157, 0.4);

    /* Text */
    --kh-text: rgba(255, 255, 255, 0.88);
    --kh-text-dim: rgba(255, 255, 255, 0.5);
    --kh-text-bright: #ffffff;

    /* Typography */
    --kh-font-display: 'Sora', 'Noto Sans SC', sans-serif;
    --kh-font-body: 'Noto Sans SC', 'Sora', -apple-system, sans-serif;
    --kh-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing & Shape */
    --kh-radius: 12px;
    --kh-radius-lg: 18px;
    --kh-radius-pill: 50px;

    /* Shadows */
    --kh-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --kh-shadow-glow: 0 8px 40px var(--kh-primary-glow);
    --kh-shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.04);

    /* Category accent colors */
    --kh-cat-java: #f59e0b;
    --kh-cat-bigdata: #3b82f6;
    --kh-cat-concurrent: #10b981;
    --kh-cat-distribute: #8b5cf6;
    --kh-cat-database: #f97316;
    --kh-cat-docker: #06b6d4;
    --kh-cat-linux: #94a3b8;
    --kh-cat-arch: #ef4444;
    --kh-cat-ai: #818cf8;
    --kh-cat-reactive: #ec4899;

    /* Easing */
    --kh-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --kh-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --- Typography --- */
body, input, select, textarea {
    font-family: var(--kh-font-body) !important;
}

h1, h2, h3, h4, h5, h6,
.major h2, .category-title, .nav-title {
    font-family: var(--kh-font-display) !important;
    letter-spacing: -0.03em;
}

code, pre, .article-content code {
    font-family: var(--kh-font-mono) !important;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(73, 191, 157, 0.2);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(73, 191, 157, 0.4); }

/* --- Selection --- */
::selection {
    background: rgba(73, 191, 157, 0.3);
    color: #fff;
}

/* ============================================================
   ATMOSPHERIC BACKGROUND
   Three layers: gradient mesh → dot grid → grain
   ============================================================ */

/* Gradient mesh — creates luminous depth with colored blobs */
body {
    background: var(--kh-bg-deep) !important;
    background-image:
        radial-gradient(ellipse 80% 50% at 15% 50%, rgba(73,191,157,0.07) 0%, transparent 70%),
        radial-gradient(ellipse 60% 80% at 80% 15%, rgba(129,140,248,0.05) 0%, transparent 60%),
        radial-gradient(ellipse 70% 60% at 60% 85%, rgba(244,114,182,0.035) 0%, transparent 55%) !important;
    color: var(--kh-text) !important;
}

/* Dot grid — subtle technical texture */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: 0.3;
    background-image: radial-gradient(circle, rgba(73,191,157,0.15) 1px, transparent 1px);
    background-size: 40px 40px;
}

/* Film grain — organic texture */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.02;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 200px 200px;
}

/* ============================================================
   KEYFRAME ANIMATIONS
   ============================================================ */
@keyframes kh-fadeInUp {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes kh-fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes kh-scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}
@keyframes kh-slideRight {
    from { opacity: 0; transform: translateX(-20px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes kh-glow-pulse {
    0%, 100% { box-shadow: 0 0 20px rgba(73,191,157,0.12); }
    50%      { box-shadow: 0 0 40px rgba(73,191,157,0.25); }
}
@keyframes kh-gradient-shift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
@keyframes kh-float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}
@keyframes kh-shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Staggered reveal — add .kh-reveal to parent */
.kh-reveal > * {
    opacity: 0;
    animation: kh-fadeInUp 0.6s var(--kh-ease) forwards;
}
.kh-reveal > *:nth-child(1)  { animation-delay: 0.06s; }
.kh-reveal > *:nth-child(2)  { animation-delay: 0.12s; }
.kh-reveal > *:nth-child(3)  { animation-delay: 0.18s; }
.kh-reveal > *:nth-child(4)  { animation-delay: 0.24s; }
.kh-reveal > *:nth-child(5)  { animation-delay: 0.30s; }
.kh-reveal > *:nth-child(6)  { animation-delay: 0.36s; }
.kh-reveal > *:nth-child(7)  { animation-delay: 0.42s; }
.kh-reveal > *:nth-child(8)  { animation-delay: 0.48s; }
.kh-reveal > *:nth-child(9)  { animation-delay: 0.54s; }
.kh-reveal > *:nth-child(10) { animation-delay: 0.60s; }

.kh-fade-in {
    animation: kh-fadeIn 0.8s ease forwards;
}

/* ============================================================
   GLASS CARD COMPONENT
   ============================================================ */
.kh-glass {
    background: var(--kh-bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--kh-border);
    border-radius: var(--kh-radius);
    box-shadow: var(--kh-shadow-inset), 0 4px 24px rgba(0,0,0,0.15);
    transition: all 0.4s var(--kh-ease);
}
.kh-glass:hover {
    background: var(--kh-bg-glass-hover);
    border-color: var(--kh-border-hover);
    box-shadow: var(--kh-shadow-inset), var(--kh-shadow);
    transform: translateY(-4px);
}

/* Elevated variant — sits higher in the z-stack */
.kh-glass-elevated {
    background: rgba(255, 255, 255, 0.07);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--kh-radius);
    box-shadow: var(--kh-shadow-inset), 0 12px 40px rgba(0,0,0,0.25);
}

/* Card with colored top edge */
.kh-card-accent {
    position: relative;
    overflow: hidden;
}
.kh-card-accent::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--kh-primary), var(--kh-accent));
    opacity: 0.6;
    transition: opacity 0.35s, height 0.35s;
}
.kh-card-accent:hover::before {
    opacity: 1;
    height: 3px;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.kh-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    padding: 0.75em 1.7em;
    border-radius: var(--kh-radius-pill);
    font-family: var(--kh-font-display);
    font-weight: 600;
    font-size: 0.88em;
    text-decoration: none;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: all 0.35s var(--kh-ease);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}
.kh-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.18), transparent 60%);
    opacity: 0;
    transition: opacity 0.35s;
}
.kh-btn:hover::before { opacity: 1; }
.kh-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--kh-shadow-glow);
    color: #fff;
}
.kh-btn:active {
    transform: translateY(-1px);
}

.kh-btn-primary {
    background: linear-gradient(135deg, var(--kh-primary), var(--kh-primary-dark));
}
.kh-btn-accent {
    background: linear-gradient(135deg, var(--kh-accent), #6366f1);
}
.kh-btn-warm {
    background: linear-gradient(135deg, var(--kh-warm), #f59e0b);
}
.kh-btn-outline {
    background: transparent;
    border: 1.5px solid var(--kh-border-hover);
    color: var(--kh-primary);
}
.kh-btn-outline:hover {
    background: var(--kh-primary-subtle);
}

/* ============================================================
   TAGS / BADGES
   ============================================================ */
.kh-tag {
    display: inline-block;
    padding: 0.25em 0.7em;
    border-radius: 8px;
    font-size: 0.78em;
    font-weight: 500;
    font-family: var(--kh-font-display);
    background: var(--kh-primary-subtle);
    color: var(--kh-primary);
    border: 1px solid rgba(73, 191, 157, 0.12);
    transition: all 0.25s var(--kh-ease);
}
.kh-tag:hover {
    background: rgba(73, 191, 157, 0.18);
    transform: translateY(-1px);
}

/* Tech badge — pill-shaped colored tag */
.kh-tech-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3em;
    padding: 0.35em 0.9em;
    border-radius: 20px;
    font-size: 0.82em;
    font-weight: 500;
    font-family: var(--kh-font-display);
    color: #fff;
    transition: all 0.3s var(--kh-ease);
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.kh-tech-badge:hover {
    transform: translateY(-2px) scale(1.04);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* ============================================================
   STAT CARDS
   ============================================================ */
.kh-stat {
    text-align: center;
    padding: 1.5em;
    background: var(--kh-bg-glass);
    border: 1px solid var(--kh-border);
    border-radius: var(--kh-radius);
    backdrop-filter: blur(8px);
    transition: all 0.35s var(--kh-ease);
}
.kh-stat:hover {
    border-color: rgba(73, 191, 157, 0.2);
    transform: translateY(-2px);
}
.kh-stat-number {
    font-family: var(--kh-font-display);
    font-size: 2.4em;
    font-weight: 800;
    color: var(--kh-primary);
    line-height: 1;
    margin-bottom: 0.25em;
    letter-spacing: -0.03em;
}
.kh-stat-label {
    font-size: 0.82em;
    color: var(--kh-text-dim);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Stats grid */
.kh-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 1em;
}

/* ============================================================
   NAVIGATION CARD (used on navigation.html)
   ============================================================ */
.kh-nav-card {
    background: var(--kh-bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--kh-radius-lg);
    padding: 2em;
    border: 1px solid var(--kh-border);
    transition: all 0.45s var(--kh-ease);
    position: relative;
    overflow: hidden;
}
.kh-nav-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--kh-primary), var(--kh-accent), var(--kh-accent2));
    opacity: 0.5;
    transition: opacity 0.35s, height 0.35s;
}
.kh-nav-card:hover::before {
    opacity: 1;
    height: 3px;
}
.kh-nav-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35), 0 0 40px rgba(73,191,157,0.08);
    border-color: var(--kh-border-hover);
    background: var(--kh-bg-glass-hover);
}
.kh-nav-card .nav-icon {
    font-size: 2.5em;
    display: block;
    margin-bottom: 0.5em;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}
.kh-nav-card .nav-title {
    color: var(--kh-primary);
    font-family: var(--kh-font-display);
    font-size: 1.2em;
    font-weight: 700;
    margin-bottom: 0.6em;
    letter-spacing: -0.02em;
}

/* ============================================================
   WORK / ARTICLE CARDS
   ============================================================ */
.kh-work-card {
    background: var(--kh-bg-glass);
    backdrop-filter: blur(8px);
    border-radius: var(--kh-radius) !important;
    border: 1px solid var(--kh-border) !important;
    padding: 1.2em;
    position: relative;
    overflow: hidden;
    transition: all 0.4s var(--kh-ease);
}
.kh-work-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--kh-primary), var(--kh-accent));
    opacity: 0;
    transition: opacity 0.35s;
}
.kh-work-card:hover::after { opacity: 1; }
.kh-work-card:hover {
    border-color: var(--kh-border-hover) !important;
    box-shadow: 0 16px 48px rgba(73,191,157,0.12);
    transform: translateY(-6px);
}

/* Skill tag — small inline label */
.kh-skill-tag {
    display: inline-block;
    padding: 0.18em 0.55em;
    border-radius: 6px;
    font-size: 0.75em;
    font-weight: 500;
    font-family: var(--kh-font-display);
    margin-right: 0.25em;
    margin-bottom: 0.25em;
    background: var(--kh-primary-subtle);
    color: var(--kh-primary);
    border: 1px solid rgba(73,191,157,0.1);
}

/* ============================================================
   QUICK LINKS
   ============================================================ */
.kh-quick-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    padding: 0.5em 1.2em;
    border-radius: var(--kh-radius-pill);
    text-decoration: none;
    font-family: var(--kh-font-display);
    font-weight: 500;
    font-size: 0.88em;
    transition: all 0.3s var(--kh-ease);
    border: 1px solid;
}
.kh-quick-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0,0,0,0.25);
}

/* ============================================================
   TOP BAR & PROGRESS
   ============================================================ */
.kh-topbar-gradient {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--kh-primary), var(--kh-accent), var(--kh-accent2), var(--kh-primary));
    background-size: 300% 100%;
    animation: kh-gradient-shift 8s ease infinite;
    z-index: 9998;
}

.kh-progress-bar {
    position: fixed;
    top: 0; left: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--kh-primary), var(--kh-accent));
    z-index: 9998;
    transition: width 0.12s linear;
    box-shadow: 0 0 10px var(--kh-primary-glow);
}

/* ============================================================
   BACK NAVIGATION (floating pill button)
   ============================================================ */
.kh-back-nav {
    position: fixed;
    top: 18px;
    right: 18px;
    background: rgba(14, 18, 33, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    color: var(--kh-primary);
    padding: 0.6em 1.3em;
    border-radius: var(--kh-radius-pill);
    text-decoration: none;
    z-index: 1000;
    border: 1px solid var(--kh-border);
    font-family: var(--kh-font-display);
    font-weight: 600;
    font-size: 0.82em;
    transition: all 0.35s var(--kh-ease);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.kh-back-nav:hover {
    background: rgba(73,191,157,0.12);
    border-color: var(--kh-border-hover);
    color: var(--kh-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(73,191,157,0.15);
}

/* ============================================================
   SIDEBAR (#header) — Enhanced Strata sidebar
   ============================================================ */
#header {
    background-color: rgba(8, 12, 21, 0.95) !important;
    background-image:
        radial-gradient(ellipse at 50% 80%, rgba(73,191,157,0.08) 0%, transparent 60%) !important;
}

#header h1 {
    font-family: var(--kh-font-display) !important;
    font-weight: 300 !important;
    letter-spacing: -0.01em !important;
    line-height: 1.6 !important;
    font-size: 0.95em !important;
}
#header h1 strong {
    font-weight: 700 !important;
    background: linear-gradient(135deg, var(--kh-primary), var(--kh-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Avatar glow ring */
#header .avatar {
    position: relative;
}
#header .avatar img {
    border: 2px solid rgba(73,191,157,0.3) !important;
    box-shadow: 0 0 24px rgba(73,191,157,0.15);
    transition: all 0.4s var(--kh-ease);
}
#header .avatar:hover img {
    border-color: var(--kh-primary) !important;
    box-shadow: 0 0 36px rgba(73,191,157,0.3);
}

/* ============================================================
   FOOTER — Enhanced
   ============================================================ */
#footer {
    color: var(--kh-text-dim);
}
#footer .icons a {
    transition: all 0.3s var(--kh-ease) !important;
}
#footer .icons a:hover {
    color: var(--kh-primary) !important;
    transform: translateY(-3px);
}

/* ============================================================
   DARK THEME OVERRIDES — Strata template compatibility
   ============================================================ */
#main {
    color: var(--kh-text);
}
#main > section {
    border-top-color: var(--kh-border) !important;
}
#main p, #main li, #main span, #main td {
    color: var(--kh-text);
}
#main h1, #main h2, #main h3, #main h4, #main h5, #main h6 {
    color: var(--kh-text-bright);
}
#main strong, #main b {
    color: var(--kh-text-bright);
    font-weight: 600;
}
#main a {
    color: var(--kh-primary);
    transition: color 0.25s;
}
#main a:hover {
    color: var(--kh-accent);
}

header.major h2 {
    color: var(--kh-text-bright) !important;
    font-weight: 700 !important;
    letter-spacing: -0.03em;
}

/* Template borders */
hr, #main > section {
    border-color: var(--kh-border) !important;
}
hr.major {
    border-color: var(--kh-border) !important;
}

blockquote {
    border-left-color: var(--kh-primary) !important;
    color: var(--kh-text-dim);
    background: var(--kh-primary-subtle);
    padding: 1em 1.2em;
    border-radius: 0 var(--kh-radius) var(--kh-radius) 0;
}

/* Form elements */
input[type="text"],
input[type="email"],
input[type="search"],
input[type="password"],
textarea,
select {
    background: rgba(255, 255, 255, 0.05) !important;
    border-color: var(--kh-border) !important;
    color: var(--kh-text) !important;
    border-radius: var(--kh-radius) !important;
    transition: all 0.3s var(--kh-ease);
}
input[type="text"]:focus,
input[type="email"]:focus,
input[type="search"]:focus,
textarea:focus {
    border-color: var(--kh-primary) !important;
    box-shadow: 0 0 16px rgba(73,191,157,0.2);
    background: rgba(255, 255, 255, 0.07) !important;
}

/* Submit buttons */
input[type="submit"],
button.primary,
.button.primary {
    background: linear-gradient(135deg, var(--kh-primary), var(--kh-primary-dark)) !important;
    border: none !important;
    border-radius: var(--kh-radius-pill) !important;
    font-family: var(--kh-font-display) !important;
    font-weight: 600 !important;
    letter-spacing: 0.01em;
    box-shadow: 0 4px 16px rgba(73,191,157,0.25);
    transition: all 0.35s var(--kh-ease) !important;
}
input[type="submit"]:hover,
button.primary:hover,
.button.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(73,191,157,0.35) !important;
}

/* ============================================================
   CATEGORY-SPECIFIC ACCENT COLORS
   Apply to parent: data-accent="java" etc.
   ============================================================ */
[data-accent="java"]    { --card-accent: var(--kh-cat-java); }
[data-accent="bigdata"] { --card-accent: var(--kh-cat-bigdata); }
[data-accent="concurrent"] { --card-accent: var(--kh-cat-concurrent); }
[data-accent="distribute"] { --card-accent: var(--kh-cat-distribute); }
[data-accent="database"] { --card-accent: var(--kh-cat-database); }
[data-accent="docker"]  { --card-accent: var(--kh-cat-docker); }
[data-accent="linux"]   { --card-accent: var(--kh-cat-linux); }
[data-accent="arch"]    { --card-accent: var(--kh-cat-arch); }
[data-accent="ai"]      { --card-accent: var(--kh-cat-ai); }
[data-accent="reactive"] { --card-accent: var(--kh-cat-reactive); }

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.kh-text-gradient {
    background: linear-gradient(135deg, var(--kh-primary), var(--kh-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.kh-section-title {
    font-family: var(--kh-font-display);
    font-weight: 700;
    font-size: 1.4em;
    color: var(--kh-text-bright);
    letter-spacing: -0.02em;
    margin-bottom: 1.2em;
    padding-bottom: 0.8em;
    border-bottom: 2px solid var(--kh-border);
    position: relative;
}
.kh-section-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--kh-primary), transparent);
}

.kh-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--kh-border), transparent);
    border: none;
    margin: 2em 0;
}

/* Flex/grid helpers */
.kh-flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}
.kh-flex-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5em;
}
.kh-grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5em;
}
.kh-grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5em;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 980px) {
    .kh-nav-card { padding: 1.5em; }
    .kh-stat-number { font-size: 1.8em; }
}

@media (max-width: 768px) {
    :root {
        --kh-radius: 10px;
        --kh-radius-lg: 14px;
    }
    body::before { opacity: 0.15; }
    .kh-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .kh-grid-2, .kh-grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .kh-back-nav { font-size: 0.75em; padding: 0.5em 1em; }
    .kh-nav-card { padding: 1.2em; }
    .kh-btn { padding: 0.6em 1.2em; font-size: 0.82em; }
}