/* ── SpaceSquare Design System ── */

@import url('https://fonts.googleapis.com/css2?family=Big+Shoulders+Display:wght@600;700;800;900&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,700;1,300&display=swap');

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

:root {
  /* Dark theme (default) */
  --bg:        #080810;
  --bg2:       #0f0f18;
  --bg3:       #16161f;
  --surface:   #1c1c27;
  --surface2:  #22222f;
  --border:    rgba(255,255,255,0.06);
  --border2:   rgba(255,255,255,0.10);
  --accent:    #7c6eff;
  --accent-h:  #9585ff;
  --accent2:   #4fd1c5;
  --red:       #ff5f6d;
  --text:      #e4e4f0;
  --muted:     #66667a;
  --dim:       #36364a;
  --noise-opacity: 0.03;
  --ambient-glow: rgba(124,110,255,0.07);
  --nav-bg:    rgba(8,8,16,0.75);
  --menu-bg:   rgba(12,12,20,0.96);
  --font-h:    'Big Shoulders Display', 'Syne', sans-serif;
  --font-b:    'DM Sans', sans-serif;
  --transition: 0.2s ease;
  color-scheme: dark;

  /* ── GOLDEN-RATIO DESIGN TOKENS (φ = 1.618, √φ = 1.272) ──
     Anchored at base 1rem (root = 15px). Spacing steps multiply by φ;
     type steps multiply by √φ, so every TWO type steps equal one golden
     step (√φ × √φ = φ) — the whole scale is mathematically locked to 1.618. */

  /* Type scale — ratio √φ (×1.272) */
  --fs-1: 0.618rem;   /* micro labels / dots          */
  --fs-2: 0.786rem;   /* captions, small UI, nav links */
  --fs-3: 1.000rem;   /* body                          */
  --fs-4: 1.272rem;   /* lead text / card titles       */
  --fs-5: 1.618rem;   /* h3 / modal title              */
  --fs-6: 2.058rem;   /* h2                            */
  --fs-7: 2.618rem;   /* section title / h1            */
  --fs-8: 4.236rem;   /* hero display (via clamp)      */

  /* Spacing scale — ratio φ (×1.618) */
  --sp-1: 0.382rem;
  --sp-2: 0.618rem;
  --sp-3: 1.000rem;
  --sp-4: 1.618rem;
  --sp-5: 2.618rem;
  --sp-6: 4.236rem;
  --sp-7: 6.854rem;

  /* φ-derived geometry */
  --radius:    0.618rem;   /* ≈ 9.3px  */
  --radius-lg: 1.000rem;   /* = 15px (ratio φ vs --radius) */
  --lh-body:   1.618;      /* golden body line-height */
  --lh-tight:  1.05;       /* display headings        */
  --nav-h:     4.236rem;   /* = --sp-6 (≈ 63.5px)     */
  --max-w:     1080px;     /* content column          */
}

/* Light theme — toggled via <html data-theme="light"> */
[data-theme="light"] {
  --bg:        #fafbff;
  --bg2:       #ffffff;
  --bg3:       #eef0f8;
  --surface:   #ffffff;
  --surface2:  #f3f4fb;
  --border:    rgba(15,15,30,0.10);
  --border2:   rgba(15,15,30,0.22);
  --accent:    #5a4ddb;
  --accent-h:  #7c6eff;
  --accent2:   #1aa79a;
  --red:       #e23a4a;
  --text:      #14142b;
  --muted:     #424256;
  --dim:       #b0b0c4;
  --noise-opacity: 0.018;
  --ambient-glow: rgba(90,77,219,0.10);
  --nav-bg:    rgba(255,255,255,0.82);
  --menu-bg:   rgba(255,255,255,0.96);
  color-scheme: light;
}

/* P0 fixes — light mode contrast on nav + ghost buttons */
[data-theme="light"] .nav-links a { color: #2e2e44; }
[data-theme="light"] .nav-links a:hover,
[data-theme="light"] .nav-links a.active {
  color: var(--accent);
  background: rgba(90,77,219,0.08);
}
[data-theme="light"] .btn-ghost {
  color: var(--text);
  border-color: rgba(15,15,30,0.32);
}
[data-theme="light"] .btn-ghost:hover {
  background: var(--surface2);
  border-color: rgba(15,15,30,0.55);
}
[data-theme="light"] .theme-toggle { color: #424256; }
[data-theme="light"] .lang-btn { color: #424256; }

/* ────────────────────────────────────────────────
   GOLD & SILVER — Dark luxe  (<html data-theme="gold-dark">)
   Warm near-black base · metallic gold accent · silver text
   ──────────────────────────────────────────────── */
[data-theme="gold-dark"] {
  --bg:        #0c0b08;
  --bg2:       #14110b;
  --bg3:       #1b170f;
  --surface:   #221d13;
  --surface2:  #2a2417;
  --border:    rgba(212,175,55,0.12);
  --border2:   rgba(212,175,55,0.24);
  --accent:    #d4af37;   /* gold */
  --accent-h:  #e6c75a;   /* lighter gold */
  --accent2:   #c5c6cc;   /* silver */
  --red:       #e0768a;
  --text:      #ece7da;   /* warm silver-white */
  --muted:     #9c9484;
  --dim:       #4a4434;
  --noise-opacity: 0.025;
  --ambient-glow: rgba(212,175,55,0.08);
  --nav-bg:    rgba(12,11,8,0.78);
  --menu-bg:   rgba(20,17,11,0.96);
  color-scheme: dark;
}
[data-theme="gold-dark"] .nav-links a { color: #b8b0a0; }
[data-theme="gold-dark"] .nav-links a:hover,
[data-theme="gold-dark"] .nav-links a.active { color: var(--accent); background: rgba(212,175,55,0.08); }
[data-theme="gold-dark"] .btn-ghost { color: var(--text); border-color: rgba(212,175,55,0.30); }
[data-theme="gold-dark"] .btn-ghost:hover { background: var(--surface); border-color: rgba(212,175,55,0.55); }
[data-theme="gold-dark"] .btn-primary { color: #1a1509; }

/* ────────────────────────────────────────────────
   GOLD & SILVER — Light luxe  (<html data-theme="gold-light">)
   Ivory base · brushed silver surfaces · deep gold accent
   ──────────────────────────────────────────────── */
[data-theme="gold-light"] {
  --bg:        #f7f5ef;
  --bg2:       #ffffff;
  --bg3:       #efebe0;
  --surface:   #ffffff;
  --surface2:  #f3efe4;
  --border:    rgba(140,115,40,0.18);
  --border2:   rgba(140,115,40,0.32);
  --accent:    #9a7d1e;   /* deep gold (contrast-safe on ivory) */
  --accent-h:  #b8962c;
  --accent2:   #8a8a92;   /* silver-gray */
  --red:       #c0392b;
  --text:      #2a2418;   /* warm near-black */
  --muted:     #6b6451;
  --dim:       #c4bca6;
  --noise-opacity: 0.015;
  --ambient-glow: rgba(154,125,30,0.10);
  --nav-bg:    rgba(247,245,239,0.82);
  --menu-bg:   rgba(255,255,255,0.96);
  color-scheme: light;
}
[data-theme="gold-light"] .nav-links a { color: #4a4332; }
[data-theme="gold-light"] .nav-links a:hover,
[data-theme="gold-light"] .nav-links a.active { color: var(--accent); background: rgba(154,125,30,0.08); }
[data-theme="gold-light"] .btn-ghost { color: var(--text); border-color: rgba(140,115,40,0.34); }
[data-theme="gold-light"] .btn-ghost:hover { background: var(--surface2); border-color: rgba(140,115,40,0.58); }
[data-theme="gold-light"] .btn-primary { color: #fff; }
[data-theme="gold-light"] .theme-toggle,
[data-theme="gold-light"] .lang-btn,
[data-theme="gold-light"] .glass-toggle,
[data-theme="gold-light"] .settings-toggle { color: #6b6451; }

/* Gold themes — recolour the animated headline gradient to gold → silver → gold */
[data-theme="gold-dark"] .accent-gradient,
[data-theme="gold-dark"] .hero h1 .accent,
[data-theme="gold-light"] .accent-gradient,
[data-theme="gold-light"] .hero h1 .accent {
  background: linear-gradient(110deg,
    var(--accent) 0%,
    var(--accent2) 38%,
    var(--accent-h) 62%,
    var(--accent) 100%);
  background-size: 250% 100%;
  filter: drop-shadow(0 0 26px rgba(212,175,55,0.30));
}

/* P3 — light-mode hero polish: subtle purple spotlight + retuned drop-shadow */
[data-theme="light"] .hero {
  background: radial-gradient(
    ellipse 70% 50% at 50% 35%,
    rgba(90,77,219,0.09) 0%,
    rgba(26,167,154,0.05) 45%,
    transparent 75%
  );
}
[data-theme="light"] .hero h1 .accent {
  filter: drop-shadow(0 4px 22px rgba(90,77,219,0.28))
          drop-shadow(0 0 1px rgba(20,20,43,0.18));
}
[data-theme="light"] .hero-greeting,
[data-theme="light"] .hero-sub {
  color: #3a3a4e;
}

/* Smooth color transition when theme switches */
html, body, .nav, .card, .nav-card, .platform-card, .platform-header,
.platform-body, .modal-box, .post-page, .sub-hero, .posts-body,
.post-body, .code-card, .stat-card, .qr-img, .modal-input, .btn,
.section, .comm-body, .comm-hero, .nav-menu, .lang-btn,
.empty-state, .post-list, .post-item, .post-tag, .nav-links a {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

html { scroll-behavior: smooth; font-size: 15px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-b);
  font-weight: 400;
  line-height: var(--lh-body);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Gradient accent for display text — purple → teal, animated */
.accent-gradient,
.hero h1 .accent {
  background: linear-gradient(110deg,
    var(--accent) 0%,
    var(--accent2) 35%,
    var(--accent-h) 65%,
    var(--accent) 100%);
  background-size: 250% 100%;
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  filter: drop-shadow(0 0 28px rgba(124,110,255,0.35));
  animation: gradient-shift 8s ease-in-out infinite;
}
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

/* Scroll progress bar */
.scroll-progress {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 300;
  transition: width 0.08s linear;
  box-shadow: 0 0 12px rgba(124,110,255,0.55);
}

/* noise grain */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: var(--noise-opacity);
}

/* ambient glow */
body::after {
  content: '';
  position: fixed; z-index: 0; pointer-events: none;
  top: -40vh; left: 50%; transform: translateX(-50%);
  width: 90vw; height: 90vh;
  background: radial-gradient(ellipse, var(--ambient-glow) 0%, transparent 65%);
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--dim); border-radius: 99px; }

/* ── NAV ── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--sp-5);
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-h);
  font-weight: 900; font-size: 1.3rem;
  letter-spacing: -0.005em;
  text-transform: uppercase;
  color: var(--text); text-decoration: none;
  flex-shrink: 0;
  line-height: 1;
}
.nav-logo .accent { color: var(--accent); }

.nav-links {
  display: flex; gap: 0.25rem; list-style: none;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: var(--fs-2);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 6px 10px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
  display: flex; align-items: center; gap: 5px;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--accent); }

.nav-badge {
  font-size: 0.62rem;
  background: rgba(255,95,109,0.15);
  color: var(--red);
  border: 1px solid rgba(255,95,109,0.25);
  padding: 1px 6px; border-radius: 99px;
  letter-spacing: 0.03em;
  text-transform: none;
  font-weight: 400;
}

.nav-right { display: flex; align-items: center; gap: var(--sp-2); }

.nav-menu { display: flex; align-items: center; gap: var(--sp-4); }

.nav-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  color: var(--text); padding: 0;
  width: 32px; height: 32px;
  flex-direction: column; gap: 5px;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav.mobile-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.mobile-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.mobile-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.lang-switcher { display: flex; gap: 3px; }

.lang-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font-b); font-size: 0.72rem;
  padding: 3px 8px; border-radius: 5px;
  cursor: pointer; transition: all var(--transition);
  letter-spacing: 0.02em;
}
.lang-btn:hover { border-color: var(--accent); color: var(--accent); }
.lang-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(124,110,255,0.1); }

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 30px; height: 30px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(20deg) scale(1.08);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s;
}
.theme-toggle .icon-sun { transform: translateY(150%); opacity: 0; }
.theme-toggle .icon-moon { transform: translateY(0); opacity: 1; }
[data-theme="light"] .theme-toggle .icon-sun { transform: translateY(0); opacity: 1; }
[data-theme="light"] .theme-toggle .icon-moon { transform: translateY(-150%); opacity: 0; }

/* Liquid-glass toggle button — mirrors .theme-toggle */
.glass-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 30px; height: 30px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition);
}
.glass-toggle:hover {
  border-color: var(--accent2);
  color: var(--accent2);
  transform: scale(1.08);
}
.glass-toggle.active {
  border-color: var(--accent2);
  background: rgba(79,209,197,0.14);
  box-shadow: 0 0 0 1px rgba(79,209,197,0.25), 0 0 12px rgba(79,209,197,0.25);
}
[data-theme="light"] .glass-toggle { color: #424256; }

/* Settings (⚙️) nav button — mirrors .theme-toggle */
.settings-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 30px; height: 30px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.settings-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(45deg) scale(1.08);
}
[data-theme="light"] .settings-toggle { color: #424256; }

/* ── PAGE WRAPPER ── */
.page { position: relative; z-index: 1; padding-top: var(--nav-h); min-height: 100vh; }

/* ── SECTION ── */
.section {
  max-width: var(--max-w); margin: 0 auto;
  padding: var(--sp-6) var(--sp-4);
}

.section-label {
  font-size: var(--fs-2); letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: var(--sp-2); font-weight: 500;
}

.section-title {
  font-family: var(--font-h); font-weight: 900;
  font-size: clamp(var(--fs-6), 4vw, var(--fs-7));
  letter-spacing: -0.015em;
  line-height: var(--lh-tight);
  margin-bottom: var(--sp-4);
}

.section-desc {
  color: var(--muted); font-size: var(--fs-3);
  max-width: 560px; margin-bottom: var(--sp-5); line-height: var(--lh-body);
}

/* ── DIVIDER ── */
hr.divider {
  border: none; border-top: 1px solid var(--border);
  margin: 0 var(--sp-4);
}

/* ── CARDS GRID ── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; gap: 1px; background: var(--border);
}

.card {
  background: var(--bg2);
  padding: var(--sp-4) var(--sp-5);
  display: flex; flex-direction: column; gap: var(--sp-2);
  transition: background var(--transition);
  cursor: pointer; text-decoration: none; color: inherit;
}
.card:hover { background: var(--bg3); }

.card-icon { font-size: var(--fs-5); line-height: 1; }

.card-title {
  font-family: var(--font-h); font-weight: 800;
  font-size: var(--fs-4); color: var(--text);
  letter-spacing: -0.005em;
  line-height: 1.1;
}

.card-desc { font-size: var(--fs-2); color: var(--muted); line-height: var(--lh-body); }

.card-arrow { margin-top: auto; padding-top: var(--sp-2); font-size: var(--fs-2); color: var(--accent); }

/* ── BUTTON ── */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-b); font-size: var(--fs-2); font-weight: 500;
  padding: var(--sp-2) var(--sp-4); border-radius: var(--radius);
  text-decoration: none; cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition); letter-spacing: 0.01em;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-h); border-color: var(--accent-h); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border2); }
.btn-ghost:hover { background: var(--surface); border-color: var(--dim); }
.btn-teal { background: rgba(79,209,197,0.12); color: var(--accent2); border-color: rgba(79,209,197,0.25); }
.btn-teal:hover { background: rgba(79,209,197,0.2); }

/* ── TAG / BADGE ── */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--border2); background: var(--surface);
  color: var(--muted); font-size: var(--fs-2);
  letter-spacing: 0.07em; text-transform: uppercase;
  padding: var(--sp-1) var(--sp-3); border-radius: 99px;
}
.tag-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent2);
  animation: pulse 2.2s ease infinite;
}
@keyframes pulse {
  0%,100% { opacity:1; transform:scale(1); }
  50%      { opacity:0.35; transform:scale(0.65); }
}

/* ── ANIMATIONS ── */
.fade-up {
  opacity: 0; transform: translateY(16px);
  animation: fadeUp 0.55s ease forwards;
}
.fade-up-1 { animation-delay: 0.08s; }
.fade-up-2 { animation-delay: 0.16s; }
.fade-up-3 { animation-delay: 0.24s; }
.fade-up-4 { animation-delay: 0.32s; }

@keyframes fadeUp {
  to { opacity:1; transform:translateY(0); }
}

/* ── FOOTER ── */
footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-5);
  display: flex; align-items: center; justify-content: space-between;
  color: var(--muted); font-size: var(--fs-2);
  flex-wrap: wrap; gap: var(--sp-2);
}
.footer-links { display: flex; gap: var(--sp-4); }
.footer-links a { color: var(--muted); text-decoration: none; transition: color var(--transition); }
.footer-links a:hover { color: var(--text); }

/* ── GRID OVERLAY ── */
.grid-overlay {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, black, transparent);
}

/* ── LOCK ICON (resume) ── */
.lock-badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.7rem; color: var(--red);
  background: rgba(255,95,109,0.1);
  border: 1px solid rgba(255,95,109,0.2);
  padding: 2px 8px; border-radius: 99px;
}

/* ── PASSWORD MODAL ── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal-box {
  background: var(--bg3); border: 1px solid var(--border2);
  border-radius: var(--radius-lg); padding: var(--sp-5);
  width: 360px; max-width: 90vw;
  display: flex; flex-direction: column; gap: var(--sp-3);
  transform: translateY(10px); transition: transform 0.2s;
}
.modal-overlay.open .modal-box { transform: translateY(0); }
.modal-box h3 { font-family: var(--font-h); font-weight: 800; font-size: var(--fs-5); letter-spacing: -0.005em; }
.modal-box p { color: var(--muted); font-size: var(--fs-2); }
.modal-input {
  background: var(--surface); border: 1px solid var(--border2);
  color: var(--text); font-family: var(--font-b); font-size: var(--fs-3);
  padding: 10px 14px; border-radius: var(--radius); width: 100%;
  outline: none; transition: border-color var(--transition);
}
.modal-input:focus { border-color: var(--accent); }
.modal-error {
  color: var(--red); font-size: 0.8rem;
  display: none;
}
.modal-error.show { display: block; }
.modal-actions { display: flex; gap: 0.75rem; justify-content: flex-end; }

/* ───────────────────────────────────────────
   MOTION — micro-interactions
─────────────────────────────────────────── */

/* Card hover lift + glow */
.card, .nav-card, .platform-card, .sub-page-card,
.code-card, .stat-card, .post-item {
  transition: transform 0.25s cubic-bezier(0.34, 1.4, 0.64, 1),
              box-shadow 0.3s ease,
              background 0.25s ease,
              border-color 0.25s ease;
  will-change: transform;
}
.card:hover, .nav-card:hover, .platform-card:hover,
.sub-page-card:hover, .post-item:hover, .code-card:hover, .stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px -18px rgba(124,110,255,0.45),
              0 0 0 1px rgba(124,110,255,0.15);
}

/* Button hover sheen */
.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.btn::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(110deg,
    transparent 30%,
    rgba(255,255,255,0.18) 50%,
    transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  z-index: 1;
}
.btn:hover::after { transform: translateX(120%); }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

/* Nav link underline grow on hover */
.nav-links a {
  position: relative;
}
.nav-links a::before {
  content: '';
  position: absolute;
  left: 10px; right: 10px; bottom: 2px;
  height: 1.5px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav-links a:hover::before,
.nav-links a.active::before {
  transform: scaleX(1);
}

/* Tag dot pulse */
.tag-dot {
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(79,209,197,0.7); }
  50%      { box-shadow: 0 0 0 6px rgba(79,209,197,0); }
}

/* Reduced motion — respect OS setting */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .scroll-progress { transition: none; }
}

/* ───────────────────────────────────────────
   RESPONSIVE — Mobile · Tablet · Desktop
   Breakpoints: ≤640 mobile · 641–1024 tablet · >1024 desktop
─────────────────────────────────────────── */

/* Tablet */
@media (max-width: 1024px) {
  .nav { padding: 0 1.5rem; }
  .nav-menu { gap: 1rem; }
  .nav-links { gap: 0.1rem; }
  .nav-links a {
    font-size: 0.74rem;
    padding: 6px 8px;
    letter-spacing: 0.04em;
  }
  .section { padding: 4rem 1.75rem; }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-menu {
    position: absolute;
    top: var(--nav-h); right: 1rem;
    background: var(--menu-bg);
    backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 0.85rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    min-width: 220px;
    opacity: 0; pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    box-shadow: 0 12px 36px rgba(0,0,0,0.35);
  }
  .nav.mobile-open .nav-menu {
    opacity: 1; pointer-events: auto; transform: translateY(0);
  }
  .nav-links {
    flex-direction: column;
    gap: 2px;
    width: 100%;
  }
  .nav-links a {
    font-size: 0.85rem;
    padding: 9px 12px;
    width: 100%;
    border-radius: 8px;
    text-transform: none;
    letter-spacing: 0.01em;
  }
  .nav-right {
    border-top: 1px solid var(--border);
    padding-top: 0.65rem;
    margin-top: 0.25rem;
    justify-content: center;
  }
  .lang-switcher { width: 100%; justify-content: center; }
}

/* Small mobile */
@media (max-width: 640px) {
  .nav { padding: 0 1.1rem; }
  .nav-logo { font-size: 0.95rem; }

  .section { padding: 3.5rem 1.25rem; }
  .section-title {
    font-size: clamp(1.4rem, 6.5vw, 1.9rem);
    letter-spacing: -0.02em;
    overflow-wrap: break-word;
    word-break: break-word;
  }
  .section-desc { font-size: 0.9rem; }

  .btn { font-size: 0.82rem; padding: 8px 14px; }

  .modal-box { padding: 1.5rem; }
  .modal-box h3 { font-size: 1rem; }

  /* Catch-all page-wrapper padding shrink (overrides per-page CSS) */
  body .sub-hero,
  body .comm-hero,
  body .post-page {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
    padding-top: 4rem;
  }
  body .posts-body,
  body .comm-body,
  body .post-body {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  body .post-page { padding-bottom: 4rem; }
  body .post-title { font-size: 1.4rem; line-height: 1.25; }
}

/* ──────────────────────────────────────────────
   LIQUID GLASS — opt-in effect (<html data-glass="on">)
   Off by default; activated only via the 🫧 nav toggle.
   Frosted translucent surfaces with a soft top sheen.
   ────────────────────────────────────────────── */
:root {
  --glass-bg:     linear-gradient(135deg, rgba(255,255,255,0.10), rgba(255,255,255,0.02));
  --glass-fill:   rgba(28,28,39,0.45);
  --glass-border: rgba(255,255,255,0.16);
  --glass-blur:   16px;
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.30);
}
[data-theme="light"] {
  --glass-bg:     linear-gradient(135deg, rgba(255,255,255,0.55), rgba(255,255,255,0.18));
  --glass-fill:   rgba(255,255,255,0.42);
  --glass-border: rgba(15,15,30,0.12);
  --glass-shadow: 0 8px 32px rgba(60,60,110,0.14);
}

/* Surfaces that become frosted glass when the effect is on */
[data-glass="on"] .card,
[data-glass="on"] .nav-card,
[data-glass="on"] .platform-card,
[data-glass="on"] .platform-header,
[data-glass="on"] .platform-body,
[data-glass="on"] .prog-card,
[data-glass="on"] .product-card,
[data-glass="on"] .modal-box,
[data-glass="on"] .code-card,
[data-glass="on"] .stat-card,
[data-glass="on"] .qr-img,
[data-glass="on"] .post-item,
[data-glass="on"] .post-tag,
[data-glass="on"] .sub-hero,
[data-glass="on"] .posts-body,
[data-glass="on"] .post-body {
  background: var(--glass-bg), var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* Nav bar gets a deeper frost */
[data-glass="on"] .nav {
  background: var(--glass-bg), var(--glass-fill);
  -webkit-backdrop-filter: blur(calc(var(--glass-blur) + 6px)) saturate(180%);
  backdrop-filter: blur(calc(var(--glass-blur) + 6px)) saturate(180%);
}

/* Mobile dropdown menu also frosts so links stay readable */
@media (max-width: 768px) {
  [data-glass="on"] .nav.mobile-open .nav-menu {
    background: var(--glass-bg), var(--glass-fill);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
    backdrop-filter: blur(var(--glass-blur)) saturate(160%);
    border: 1px solid var(--glass-border);
  }
}

/* Graceful fallback: browsers without backdrop-filter get a solid-ish tint */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  [data-glass="on"] .card,
  [data-glass="on"] .nav-card,
  [data-glass="on"] .platform-card,
  [data-glass="on"] .platform-header,
  [data-glass="on"] .platform-body,
  [data-glass="on"] .prog-card,
  [data-glass="on"] .product-card,
  [data-glass="on"] .modal-box,
  [data-glass="on"] .code-card,
  [data-glass="on"] .stat-card,
  [data-glass="on"] .post-item,
  [data-glass="on"] .sub-hero,
  [data-glass="on"] .posts-body,
  [data-glass="on"] .post-body,
  [data-glass="on"] .nav {
    background: var(--surface);
  }
}

/* ──────────────────────────────────────────────
   SETTINGS MODAL — controls (built in components.js)
   Reuses .modal-overlay / .modal-box; adds a wider box + control rows.
   ────────────────────────────────────────────── */
.settings-modal .modal-box {
  width: 420px;
  gap: var(--sp-4);
  text-align: left;
}
.settings-head { display: flex; flex-direction: column; gap: var(--sp-1); }
.settings-sub { color: var(--muted); font-size: var(--fs-2); }

.settings-group { display: flex; flex-direction: column; gap: var(--sp-2); }
.settings-label {
  font-size: var(--fs-1); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
}

/* Segmented control (theme + language pickers) */
.seg {
  display: flex; flex-wrap: wrap; gap: var(--sp-1);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: var(--sp-1);
}
.seg-btn {
  flex: 1 1 auto; min-width: 64px;
  background: none; border: 1px solid transparent;
  color: var(--muted); font-family: var(--font-b); font-size: var(--fs-2);
  padding: var(--sp-1) var(--sp-2); border-radius: calc(var(--radius) - 2px);
  cursor: pointer; transition: all var(--transition); white-space: nowrap;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.active {
  color: var(--accent);
  background: var(--bg2);
  border-color: var(--border2);
}

/* Switch rows (glass + reduce-motion) */
.settings-row {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3);
}
.settings-row .settings-row-text { display: flex; flex-direction: column; gap: 2px; }
.settings-row .settings-row-title { font-size: var(--fs-3); color: var(--text); }
.settings-row .settings-row-desc { font-size: var(--fs-1); color: var(--muted); }

.switch {
  position: relative; flex-shrink: 0;
  width: 44px; height: 24px; border-radius: 99px;
  background: var(--surface2); border: 1px solid var(--border2);
  cursor: pointer; transition: background var(--transition), border-color var(--transition);
}
.switch::after {
  content: ''; position: absolute; top: 2px; left: 2px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--muted);
  transition: transform var(--transition), background var(--transition);
}
.switch.on { background: rgba(124,110,255,0.20); border-color: var(--accent); }
.switch.on::after { transform: translateX(20px); background: var(--accent); }

.settings-reset {
  align-self: flex-start;
  background: none; border: 1px solid var(--border2);
  color: var(--muted); font-family: var(--font-b); font-size: var(--fs-2);
  padding: var(--sp-1) var(--sp-3); border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition);
}
.settings-reset:hover { color: var(--red); border-color: var(--red); }

/* ──────────────────────────────────────────────
   REDUCE MOTION — opt-in UI parameter (<html data-motion="reduce">)
   Damps animations/transitions site-wide when the user enables it in Settings.
   Independent of the OS prefers-reduced-motion rule, which still applies.
   ────────────────────────────────────────────── */
[data-motion="reduce"] *,
[data-motion="reduce"] *::before,
[data-motion="reduce"] *::after {
  animation-duration: 0.001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.001ms !important;
  scroll-behavior: auto !important;
}
