/* ==========================================================================
   GERETT — BIBLIOTECA ORGANIZACIONAL
   UI Premium Industrial-grade — v4.0
   ========================================================================== */

@import url('design-tokens.css');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
* { -webkit-tap-highlight-color: transparent; }

html {
  scroll-padding-top: 100px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background .5s var(--ease-fluid), color .5s var(--ease-fluid);
  min-height: 100dvh;
}
@media (max-width: 768px) {
  body { padding-bottom: 72px; }
}

::selection { background: var(--c-eng-blue); color: #fff; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; border: none; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
ul, ol { list-style: none; }

/* ─── Noise ─── */
.noise-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background-image: var(--grain);
  pointer-events: none; opacity: 0.5; mix-blend-mode: multiply;
}
[data-theme="dark"] .noise-overlay { mix-blend-mode: overlay; opacity: 0.6; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--text-tertiary); border-radius: var(--radius-full); border: 2px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--c-eng-blue); }

/* ─── Progress Bar ─── */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 2px;
  background: linear-gradient(90deg, var(--c-eng-blue), var(--c-laser-cyan));
  z-index: 1001; width: 0%;
  box-shadow: 0 0 12px rgba(0, 128, 255, 0.5);
  transition: width .1s var(--ease-expo);
}

/* ==========================================================================
   NAVBAR — Floating Glass Pill
   ========================================================================== */
.navbar {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%);
  z-index: 100;
  width: calc(100% - 24px); max-width: var(--max-w);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 6px 8px 6px 6px;
  box-shadow: 0 8px 32px var(--shadow), inset 0 1px 1px rgba(255,255,255,0.15);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  transition: background .5s var(--ease-fluid), border-color .5s, box-shadow .5s;
}
.navbar.scrolled {
  box-shadow: 0 16px 48px var(--shadow-lg), inset 0 1px 1px rgba(255,255,255,0.18);
  border-color: var(--border-strong);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 4px; min-height: 52px; gap: 8px;
}

/* Logo */
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
  letter-spacing: -0.01em; padding: 8px 14px; border-radius: var(--radius-full);
  transition: all .35s var(--ease-fluid); flex-shrink: 0;
}
.nav-logo:hover { background: var(--bg-alt); }
.nav-logo svg { flex-shrink: 0; color: var(--c-eng-blue); }
[data-theme="dark"] .nav-logo svg { color: var(--c-laser-cyan); }

/* Nav Links (centro) */
.nav-links {
  display: flex; gap: 2px; align-items: center; justify-content: center;
  flex: 1; min-width: 0;
}
.nav-link {
  padding: 8px 14px; border-radius: var(--radius-full);
  font-size: 0.875rem; font-weight: 500;
  color: var(--text-secondary); white-space: nowrap;
  transition: all .35s var(--ease-fluid);
}
.nav-link:hover { color: var(--text); background: var(--bg-alt); }
.nav-link.active { color: var(--c-eng-blue); background: var(--brand-light); }
[data-theme="dark"] .nav-link.active { color: var(--c-laser-cyan); }

/* Actions */
.nav-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }

.theme-toggle {
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); transition: all .4s var(--ease-fluid);
}
.theme-toggle:hover {
  background: var(--bg-alt); color: var(--c-eng-blue);
  transform: rotate(8deg) scale(1.05);
}
[data-theme="dark"] .theme-toggle:hover { color: var(--c-laser-cyan); }
.theme-toggle svg { transition: transform .5s var(--ease-spring); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* Hamburger */
.nav-toggle {
  width: 44px; height: 44px; border-radius: 50%;
  display: none; flex-direction: column; align-items: center; justify-content: center;
  gap: 5px; background: var(--bg-alt); transition: all .4s var(--ease-fluid);
}
.nav-toggle .hamburger-line {
  width: 18px; height: 2px; background: var(--text); border-radius: 2px;
  transition: all .4s var(--ease-fluid); transform-origin: center;
}
.nav-toggle[aria-expanded="true"] { background: var(--c-eng-blue); }
.nav-toggle[aria-expanded="true"] .hamburger-line { background: #fff; }
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Mobile Nav Overlay ─── */
.mobile-nav-overlay {
  position: fixed; inset: 0; z-index: 99;
  background: rgba(11, 14, 17, 0.88);
  backdrop-filter: blur(32px) saturate(180%);
  -webkit-backdrop-filter: blur(32px) saturate(180%);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity .5s var(--ease-fluid); padding: 24px;
}
.mobile-nav-overlay.open { opacity: 1; pointer-events: all; }
.mobile-nav-overlay[hidden] { display: none; }
.mobile-nav-inner {
  width: 100%; max-width: 480px; display: flex; flex-direction: column;
  gap: 8px; text-align: center;
}
.mobile-nav-links { display: flex; flex-direction: column; gap: 4px; }
.mobile-nav-link {
  font-family: var(--font-display); font-size: 1.8rem; font-weight: 600;
  padding: 16px 24px; border-radius: var(--radius-md);
  color: rgba(255, 255, 255, 0.75); transition: all .35s var(--ease-fluid);
  letter-spacing: -0.01em;
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  color: #fff; background: rgba(255, 255, 255, 0.08);
}
.mobile-nav-footer { margin-top: 32px; text-align: center; }
.mobile-nav-footer .theme-toggle {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 24px; border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.7); width: auto; height: auto;
}

/* ─── Mobile Bottom Nav Bar ─── */
.mobile-bottom-nav {
  display: none; position: fixed; bottom: 0; left: 0; right: 0;
  z-index: 1001;
  background: var(--glass-bg);
  border-top: 1px solid var(--glass-border);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  box-shadow: 0 -4px 24px var(--shadow);
}
.mbn-item {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; padding: 6px 10px; border-radius: var(--radius-md);
  color: var(--text-tertiary); font-size: 0.62rem; font-weight: 500;
  letter-spacing: 0.03em; transition: all .3s var(--ease-fluid);
  flex: 1; min-width: 0; border: none; background: none;
  font-family: var(--font-body);
}
.mbn-item svg { flex-shrink: 0; transition: transform .3s var(--ease-spring); }
.mbn-item.active, .mbn-item:hover {
  color: var(--c-eng-blue);
}
[data-theme="dark"] .mbn-item.active,
[data-theme="dark"] .mbn-item:hover { color: var(--c-laser-cyan); }
.mbn-item.active svg { transform: scale(1.1); }
.mbn-search .mbn-search-ring {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-electric-blue));
  display: flex; align-items: center; justify-content: center;
  color: #fff; margin-top: -18px;
  box-shadow: 0 4px 20px rgba(0, 128, 255, 0.4);
  transition: all .3s var(--ease-spring);
}
.mbn-search:hover .mbn-search-ring { transform: scale(1.08); }
[data-theme="dark"] .mbn-search .mbn-search-ring {
  background: linear-gradient(135deg, var(--c-laser-cyan), var(--c-eng-blue));
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.4);
}
.mbn-theme svg { transition: transform .5s var(--ease-spring); }
.mbn-theme:hover svg { transform: rotate(30deg); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative; min-height: 100dvh;
  display: flex; align-items: center; overflow: hidden;
  padding: 100px 24px 60px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, var(--hero-glow-1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, var(--hero-glow-2) 0%, transparent 50%),
    var(--bg);
}
.hero-grid-pattern {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, #000 30%, transparent 80%);
}


/* Cerebro 3D holográfico */
.hero-brain {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 90vmin; height: 90vmin; max-width: 800px; max-height: 800px;
  z-index: 1; pointer-events: none; opacity: 0;
  transition: opacity 1.2s var(--ease-expo);
}
.hero-brain.loaded { opacity: 0.45; }
.hero-brain spline-viewer {
  width: 100%; height: 100%; display: block;
}

/* Hero content */
.hero-content {
  position: relative; z-index: 2; width: 100%; max-width: var(--max-w);
  margin: 0 auto; display: flex; flex-direction: column; align-items: center;
  gap: 48px;
}
.hero-content::before {
  content: ''; position: absolute; z-index: -1;
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, var(--hero-glow-1) 0%, var(--hero-glow-2) 40%, transparent 70%);
  filter: blur(80px); opacity: 0.5;
  top: -100px; left: -200px;
  animation: heroGlow 8s ease-in-out infinite alternate;
}
.hero-content::after {
  content: ''; position: absolute; z-index: -1;
  width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, var(--hero-glow-2) 0%, transparent 65%);
  filter: blur(60px); opacity: 0.35;
  bottom: -80px; right: -150px;
  animation: heroGlow2 10s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); opacity: 0.4; }
  100% { transform: translate(60px, 30px) scale(1.15); opacity: 0.6; }
}
@keyframes heroGlow2 {
  0% { transform: translate(0, 0) scale(1); opacity: 0.3; }
  100% { transform: translate(-40px, -20px) scale(1.1); opacity: 0.5; }
}
.hero-left {
  max-width: 820px; text-align: center;
  display: flex; flex-direction: column; align-items: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: var(--radius-full);
  background: var(--brand-light); color: var(--c-eng-blue);
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em;
  border: 1px solid var(--glass-border); width: fit-content;
}
[data-theme="dark"] .hero-eyebrow { color: var(--c-laser-cyan); }
.hero-title {
  font-family: var(--font-display); font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800; line-height: 1.1; letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.hero-title .accent {
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-laser-cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-subtitle {
  font-size: 1.05rem; color: var(--text-secondary); line-height: 1.6;
  max-width: 600px; margin: 0 auto 8px;
}
.hero-purpose {
  padding: 20px 24px; border-radius: var(--radius-lg);
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px); margin-bottom: 8px; text-align: center; width: 100%;
  max-width: 680px;
}
.hero-purpose p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.6; }
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap; justify-content: center;
}
.hero-stats .stat { text-align: center; }
.stat-num {
  font-family: var(--font-display); font-size: 2rem; font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-laser-cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label {
  font-size: 0.78rem; color: var(--text-tertiary); font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.06em; margin-top: 2px;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px; border-radius: var(--radius-full);
  font-size: 0.9rem; font-weight: 600; position: relative; overflow: hidden;
  transition: all .45s var(--ease-fluid); letter-spacing: -0.005em;
}
.btn::after {
  content: ''; position: absolute; top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.18), transparent);
  transition: left .8s var(--ease-expo);
}
.btn:hover::after { left: 100%; }
.btn::before {
  content: ''; position: absolute; top: -1px; left: -100%; right: -1px; bottom: -1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  transition: left .6s var(--ease-expo); pointer-events: none;
}
.btn:hover::before { left: 100%; }
.btn-primary {
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-electric-blue));
  color: #fff; box-shadow: 0 6px 24px rgba(0, 128, 255, 0.32);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 12px 36px rgba(0, 128, 255, 0.42);
}
.btn-ghost {
  border: 1px solid var(--border-strong); background: var(--glass-bg);
  color: var(--text); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
.btn-ghost:hover {
  background: var(--bg-card); transform: translateY(-2px); border-color: var(--c-eng-blue);
}
.btn .btn-icon {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.16); transition: all .4s var(--ease-fluid);
}
.btn-primary:hover .btn-icon { transform: translateX(4px); }
.btn-lg { padding: 16px 28px; font-size: 0.95rem; }

/* ==========================================================================
   SECTIONS
   ========================================================================== */
.section {
  padding: 100px 24px; max-width: var(--max-w); margin: 0 auto;
  position: relative;
}
.section-header { text-align: center; margin-bottom: 56px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: var(--radius-full);
  background: var(--brand-light); color: var(--c-eng-blue);
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 16px;
}
[data-theme="dark"] .eyebrow { color: var(--c-laser-cyan); }
.section-title {
  font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800; line-height: 1.15; letter-spacing: -0.025em;
  margin-bottom: 16px;
}
.section-title .accent {
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-laser-cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.section-subtitle {
  font-size: 1rem; color: var(--text-secondary); max-width: 600px;
  margin: 0 auto; line-height: 1.6;
}

/* ─── Index Nav Grid ─── */
.index-nav { max-width: 900px; margin: 0 auto; padding: 0 24px; }
.index-nav-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 6px;
}
.index-item {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 20px; border-radius: var(--radius-md);
  background: var(--bg-card); border: 1px solid var(--border);
  cursor: pointer; transition: all .35s var(--ease-fluid);
}
.index-item:hover {
  background: var(--brand-light); border-color: var(--c-eng-blue);
  transform: translateX(4px);
}
[data-theme="dark"] .index-item:hover { border-color: var(--c-laser-cyan); }
.index-item-num {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600;
  color: var(--text-tertiary); min-width: 24px;
}
.index-item-text { flex: 1; min-width: 0; }
.index-item-name {
  font-family: var(--font-display); font-size: 0.9rem; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.index-item-meta { font-size: 0.72rem; color: var(--text-tertiary); }

/* ─── Topics Grid ─── */
.topics-grid {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px; padding: 0 24px 40px;
}

/* ─── Topic Card ─── */
a.topic-card,
a.topic-card:link,
a.topic-card:visited {
  color: inherit; text-decoration: none; display: block;
}
.topic-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  cursor: pointer; position: relative; overflow: hidden;
  transition: all .45s var(--ease-fluid);
}
.topic-card::before {
  content: ''; position: absolute; top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--card-accent, var(--c-eng-blue)), var(--c-laser-cyan));
  transform: scaleX(0); transform-origin: left;
  transition: transform .5s var(--ease-expo);
}
.topic-card:hover::before { transform: scaleX(1); }
.topic-card:hover {
  transform: translateY(-4px); box-shadow: 0 14px 48px var(--shadow-md);
  border-color: var(--card-accent, var(--c-eng-blue));
}
.topic-card-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: var(--card-accent-light, var(--brand-light));
  color: var(--card-accent, var(--c-eng-blue));
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.topic-card h3 {
  font-family: var(--font-display); font-size: 1.05rem; font-weight: 600;
  margin-bottom: 8px; letter-spacing: -0.01em;
}
.topic-card p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.topic-count {
  display: inline-block; margin-top: 18px;
  font-size: 0.72rem; color: var(--text-tertiary);
  font-family: var(--font-mono); font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.08em;
}

/* ==========================================================================
   SEARCH
   ========================================================================== */
.search-wrapper { max-width: 640px; margin: 0 auto 40px; padding: 0 24px; position: relative; }
.search-box {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-full); padding: 6px 20px;
  transition: all .4s var(--ease-fluid);
}
.search-box:focus-within {
  border-color: var(--c-eng-blue); box-shadow: 0 0 0 4px var(--brand-light);
}
[data-theme="dark"] .search-box:focus-within { border-color: var(--c-laser-cyan); }
.search-icon { color: var(--text-tertiary); flex-shrink: 0; }
.search-input {
  flex: 1; border: none; background: transparent; padding: 12px 0;
  font-size: 0.95rem; color: var(--text); outline: none;
}
.search-input::placeholder { color: var(--text-tertiary); }
.search-clear {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-tertiary); transition: all .3s var(--ease-fluid);
}
.search-clear:hover { background: var(--bg-alt); color: var(--text); }
.search-hint { text-align: center; font-size: 0.78rem; color: var(--text-tertiary); margin-top: 12px; }

.search-suggestions {
  position: absolute; top: calc(100% + 8px); left: 24px; right: 24px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: 0 12px 40px var(--shadow-lg);
  max-height: 320px; overflow-y: auto; opacity: 0;
  pointer-events: none; transform: translateY(-8px);
  transition: all .3s var(--ease-fluid); z-index: 50;
}
.search-suggestions.open { opacity: 1; pointer-events: all; transform: translateY(0); }
.suggestion-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  cursor: pointer; transition: background .2s;
}
.suggestion-item:hover, .suggestion-item.highlighted { background: var(--bg-alt); }
.suggestion-item-icon { color: var(--text-tertiary); flex-shrink: 0; }
.suggestion-item-title { font-size: 0.88rem; font-weight: 500; }
.suggestion-item-parent { font-size: 0.72rem; color: var(--text-tertiary); }

.search-highlight {
  color: var(--c-eng-blue); font-weight: 600;
}
[data-theme="dark"] .search-highlight { color: var(--c-laser-cyan); }

.search-empty {
  text-align: center; padding: 80px 24px; max-width: 440px; margin: 0 auto;
}
.search-empty svg { color: var(--text-tertiary); margin-bottom: 20px; }
.search-empty h3 { font-family: var(--font-display); margin-bottom: 10px; font-size: 1.15rem; }
.search-empty p { font-size: 0.9rem; color: var(--text-secondary); }

/* ==========================================================================
   TOPIC DETAIL PANEL
   ========================================================================== */
.topic-detail {
  position: fixed; inset: 0; z-index: 200;
  display: flex; justify-content: flex-end;
  opacity: 0; pointer-events: none;
  transition: opacity .5s var(--ease-fluid);
}
.topic-detail.open { opacity: 1; pointer-events: all; }
.topic-detail[hidden] { display: none; }
.topic-detail-backdrop {
  position: absolute; inset: 0;
  background: rgba(11, 14, 17, 0.55);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.topic-detail-panel {
  position: relative; width: 100%; max-width: 640px; height: 100%;
  background: var(--bg); border-left: 1px solid var(--border);
  overflow-y: auto; transform: translateX(100%);
  transition: transform .65s var(--ease-expo);
  display: flex; flex-direction: column;
}
.topic-detail.open .topic-detail-panel { transform: translateX(0); }
.topic-detail-header {
  padding: 32px; position: sticky; top: 0;
  background: var(--glass-bg); backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px); border-bottom: 1px solid var(--border);
  z-index: 2; display: flex; flex-direction: column; gap: 14px;
}
.topic-detail-back {
  display: inline-flex; align-items: center; gap: 8px;
  align-self: flex-start; padding: 8px 14px 8px 10px;
  border-radius: var(--radius-full); color: var(--text-secondary);
  font-size: 0.82rem; font-weight: 500; border: 1px solid var(--border);
  transition: all .35s var(--ease-fluid);
}
.topic-detail-back:hover {
  color: var(--c-eng-blue); border-color: var(--c-eng-blue);
  transform: translateX(-3px);
}
[data-theme="dark"] .topic-detail-back:hover { color: var(--c-laser-cyan); }
.topic-detail-meta { display: flex; justify-content: space-between; align-items: center; }
.detail-tag {
  padding: 5px 14px; border-radius: var(--radius-full);
  background: var(--brand-light); color: var(--c-eng-blue);
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  border: 1px solid var(--glass-border);
}
[data-theme="dark"] .detail-tag { color: var(--c-laser-cyan); }
.detail-close {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); transition: all .3s var(--ease-fluid);
}
.detail-close:hover { background: var(--bg-alt); color: var(--text); }
.detail-title {
  font-family: var(--font-display); font-size: 1.5rem; font-weight: 700;
  letter-spacing: -0.02em;
}
.detail-desc { font-size: 0.88rem; color: var(--text-secondary); }

.topic-detail-content { padding: 24px 32px 48px; }
.detail-item { border-bottom: 1px solid var(--border); }
.detail-item-header {
  width: 100%; display: flex; align-items: center; gap: 12px;
  padding: 16px 0; text-align: left;
}
.detail-item-header h4 { flex: 1; font-size: 0.92rem; font-weight: 600; }
.detail-item-icon {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--brand-light); color: var(--c-eng-blue);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
[data-theme="dark"] .detail-item-icon { color: var(--c-laser-cyan); }
.detail-chevron {
  color: var(--text-tertiary); transition: transform .3s var(--ease-fluid); flex-shrink: 0;
}
.detail-item.expanded .detail-chevron { transform: rotate(180deg); }
.detail-item-body {
  max-height: 0; overflow: hidden;
  transition: max-height .4s var(--ease-expo);
}
.detail-item.expanded .detail-item-body { max-height: 2000px; }
.detail-definicao { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 16px; }
.detail-section { margin-bottom: 16px; }
.detail-section h5 {
  font-size: 0.78rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-tertiary); margin-bottom: 8px;
}
.detail-section ul { padding-left: 20px; }
.detail-section li {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6;
  margin-bottom: 4px; list-style: disc;
}
.detail-formula {
  display: block; padding: 16px; border-radius: var(--radius-md);
  background: var(--bg-alt); font-family: var(--font-mono);
  font-size: 0.85rem; overflow-x: auto; border: 1px solid var(--border);
}
.detail-references { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border); }
.detail-references-title {
  font-size: 0.78rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-tertiary); margin-bottom: 12px;
}
.detail-references-list li {
  font-size: 0.82rem; color: var(--text-secondary); line-height: 1.55;
  margin-bottom: 8px; padding-left: 12px; border-left: 2px solid var(--border);
}
.ref-tipo {
  display: inline-block; padding: 2px 8px; border-radius: var(--radius-sm);
  background: var(--brand-light); color: var(--c-eng-blue);
  font-family: var(--font-mono); font-size: 0.65rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em; margin-right: 6px;
}
[data-theme="dark"] .ref-tipo { color: var(--c-laser-cyan); }

/* ==========================================================================
   COURSE / RESOURCE / FORM CARDS
   ========================================================================== */
.resource-grid, .course-grid, .form-grid {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px; padding: 0 24px 40px;
}
.course-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
  transition: all .4s var(--ease-fluid); position: relative; overflow: hidden;
}
.course-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--c-eng-blue), var(--c-laser-cyan));
  transform: scaleX(0); transform-origin: left; transition: transform .5s var(--ease-expo);
}
.course-card:hover::before { transform: scaleX(1); }
.course-card:hover { transform: translateY(-4px); box-shadow: 0 14px 48px var(--shadow-md); }
.course-platform {
  display: inline-block; padding: 4px 12px; border-radius: var(--radius-full);
  font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; width: fit-content;
  background: var(--brand-light); color: var(--c-eng-blue);
}
[data-theme="dark"] .course-platform { color: var(--c-laser-cyan); }
.course-platform.senai { background: #0055FF22; color: #0055FF; }
.course-platform.bradesco { background: #FF6B0022; color: #FF6B00; }
.course-platform.sebrae { background: #00838F22; color: #00838F; }
.course-platform.coursera { background: #0056D222; color: #0056D2; }
.course-platform.microsoft { background: #00A4EF22; color: #00A4EF; }
.course-card h3 {
  font-family: var(--font-display); font-size: 1.02rem; font-weight: 600;
  letter-spacing: -0.01em;
}
.course-card p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.course-meta { display: flex; gap: 16px; font-size: 0.75rem; color: var(--text-tertiary); }
.course-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 600; color: var(--c-eng-blue);
  margin-top: auto; transition: all .3s var(--ease-fluid);
}
.course-link:hover { gap: 12px; }
[data-theme="dark"] .course-link { color: var(--c-laser-cyan); }

/* ─── Section Nav (filters) ─── */
.section-nav {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  max-width: 800px; margin: 0 auto 48px; padding: 0 24px;
}
.section-nav-btn {
  padding: 9px 20px; border-radius: var(--radius-full);
  font-size: 0.84rem; font-weight: 500;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-secondary); transition: all .35s var(--ease-fluid);
}
.section-nav-btn:hover { color: var(--text); border-color: var(--text-tertiary); }
.section-nav-btn.active {
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-electric-blue));
  color: #fff; border-color: transparent;
  box-shadow: 0 4px 16px rgba(0, 128, 255, 0.3);
}

/* ─── Back Link ─── */
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: var(--radius-full);
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  color: var(--text-secondary); font-size: 0.82rem; font-weight: 500;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: all 0.3s var(--ease-fluid); margin-bottom: 24px;
}
.back-link:hover {
  color: var(--c-eng-blue); border-color: var(--c-eng-blue);
  background: var(--brand-light); transform: translateX(-3px);
}
[data-theme="dark"] .back-link:hover { color: var(--c-laser-cyan); border-color: var(--c-laser-cyan); }
.back-link svg { flex-shrink: 0; }

/* ─── Page Header ─── */
.page-header {
  padding: 160px 24px 60px; text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}
.page-header h1 {
  font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800; line-height: 1.15; letter-spacing: -0.025em; margin-bottom: 16px;
}
.page-header .accent {
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-laser-cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.page-header p {
  font-size: 1.02rem; color: var(--text-secondary);
  max-width: 600px; margin: 0 auto; line-height: 1.6;
}

/* ─── About ─── */
.about-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 40%, var(--hero-glow-1) 0%, transparent 70%);
  pointer-events: none;
}
.about-grid {
  max-width: 960px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.about-card { border-radius: var(--radius-lg); transition: all .45s var(--ease-fluid); }
.about-card:hover { transform: translateY(-4px); }
.card-outer {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 2px; box-shadow: 0 4px 20px var(--shadow); height: 100%;
}
.card-inner {
  background: var(--bg-card); border-radius: calc(var(--radius-lg) - 2px);
  padding: 32px; height: 100%;
}
.card-icon {
  width: 52px; height: 52px; border-radius: var(--radius-md);
  background: var(--brand-light); color: var(--c-eng-blue);
  display: flex; align-items: center; justify-content: center; margin-bottom: 20px;
}
[data-theme="dark"] .card-icon { color: var(--c-laser-cyan); }
.card-inner h3 {
  font-family: var(--font-display); font-size: 1.1rem; font-weight: 600; margin-bottom: 8px;
}
.card-inner p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }
.about-cta { text-align: center; margin-top: 56px; }

/* ─── Form Cards ─── */
.form-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
  display: flex; align-items: center; gap: 16px;
  transition: all .4s var(--ease-fluid);
}
.form-card:hover { transform: translateY(-3px); box-shadow: 0 12px 40px var(--shadow-md); }
.form-card-icon {
  width: 52px; height: 52px; border-radius: var(--radius-md);
  background: var(--brand-light); color: var(--c-eng-blue);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
[data-theme="dark"] .form-card-icon { color: var(--c-laser-cyan); }
.form-card-info { flex: 1; min-width: 0; }
.form-card-info h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.form-card-info p { font-size: 0.78rem; color: var(--text-tertiary); }
.form-download {
  padding: 10px 18px; border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--c-eng-blue), var(--c-electric-blue));
  color: #fff; font-size: 0.8rem; font-weight: 600;
  transition: all .3s var(--ease-fluid); flex-shrink: 0;
}
.form-download:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(0, 128, 255, 0.3); }

/* ─── Contact / Forms ─── */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
  max-width: 900px; margin: 0 auto; padding: 0 24px;
}
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 0.82rem; font-weight: 600; margin-bottom: 6px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 12px 16px; border-radius: var(--radius-md);
  background: var(--bg-card); border: 1px solid var(--border);
  font-size: 0.9rem; transition: all .3s var(--ease-fluid);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--c-eng-blue);
  box-shadow: 0 0 0 4px var(--brand-light);
}
[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .form-textarea:focus { border-color: var(--c-laser-cyan); }
.form-textarea { resize: vertical; min-height: 120px; }
.btn-full { width: 100%; justify-content: center; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background: var(--bg-alt); border-top: 1px solid var(--border);
  padding: 64px 24px 32px;
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr 2fr; gap: 48px;
  padding-bottom: 40px; border-bottom: 1px solid var(--border);
}
.footer-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; font-size: 1.1rem;
  margin-bottom: 12px;
}
.footer-logo svg { color: var(--c-eng-blue); }
[data-theme="dark"] .footer-logo svg { color: var(--c-laser-cyan); }
.footer-tagline { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; max-width: 320px; }
.footer-nav {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
}
.footer-nav-group h4 {
  font-family: var(--font-display); font-size: 0.82rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 16px;
}
.footer-nav-group li { margin-bottom: 10px; }
.footer-nav-group a {
  font-size: 0.85rem; color: var(--text-secondary); transition: color .3s;
}
.footer-nav-group a:hover { color: var(--c-eng-blue); }
[data-theme="dark"] .footer-nav-group a:hover { color: var(--c-laser-cyan); }
.footer-bottom {
  max-width: var(--max-w); margin: 24px auto 0;
  display: flex; justify-content: space-between; align-items: center;
}
.footer-bottom p { font-size: 0.78rem; color: var(--text-tertiary); }
.footer-links { display: flex; gap: 20px; }
.footer-link { font-size: 0.78rem; color: var(--text-tertiary); transition: color .3s; }
.footer-link:hover { color: var(--c-eng-blue); }
[data-theme="dark"] .footer-link:hover { color: var(--c-laser-cyan); }

/* ─── Scroll Top ─── */
.scroll-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--border);
  box-shadow: 0 6px 24px var(--shadow-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); opacity: 0; pointer-events: none;
  transform: translateY(12px); transition: all .4s var(--ease-fluid);
}
.scroll-top.visible { opacity: 1; pointer-events: all; transform: translateY(0); }
.scroll-top:hover { color: var(--c-eng-blue); transform: translateY(-3px); }
@media (max-width: 768px) {
  .scroll-top { right: 16px; bottom: 88px; width: 44px; height: 44px; }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-visual { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .about-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 880px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .mobile-bottom-nav { display: flex; }
}

@media (max-width: 768px) {
  .hero { padding: 110px 18px 64px; min-height: auto; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .section { padding: 70px 18px; }
  .topics-grid { grid-template-columns: 1fr; }
  .index-nav-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .resource-grid, .course-grid, .form-grid { grid-template-columns: 1fr; padding: 0 18px 40px; }
  .page-header { padding: 130px 18px 44px; }
  .topic-detail-panel { max-width: 100%; }
  .detail-title { font-size: 1.35rem; }
  .hero-purpose { padding: 20px; }
  .cursor-dot, .cursor-ring { display: none !important; }
  html.has-cursor * { cursor: auto !important; }
  .hero-title { font-size: 2rem; }
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .navbar { width: calc(100% - 16px); top: 8px; }
}

/* ─── Corner Badge ─── */
.corner-badge {
  position: absolute; top: -1px; right: -1px;
  width: 60px; height: 60px; overflow: hidden;
  border-top-right-radius: var(--radius-lg); pointer-events: none;
}
.corner-badge::before {
  content: 'GER'; position: absolute; top: 8px; right: -20px;
  font-family: var(--font-mono); font-size: 0.55rem; font-weight: 700;
  letter-spacing: 0.12em; color: var(--c-eng-blue);
  transform: rotate(45deg); text-shadow: 0 0 8px hsla(220, 90%, 55%, 0.3);
}
[data-theme="dark"] .corner-badge::before { color: var(--c-laser-cyan); }

/* ─── Magnetic Cursor ─── */
.cursor-dot, .cursor-ring {
  position: fixed; top: 0; left: 0; width: 8px; height: 8px;
  border-radius: 50%; pointer-events: none; z-index: 99999;
  mix-blend-mode: difference; will-change: transform;
}
.cursor-dot { background: #fff; width: 8px; height: 8px; }
.cursor-ring {
  border: 1.5px solid rgba(255,255,255,0.5); width: 40px; height: 40px;
  transition: width 0.2s, height 0.2s, border-color 0.2s;
}
.cursor-ring.cursor-ring-active { width: 56px; height: 56px; border-color: var(--c-eng-blue); }
.cursor-dot.cursor-dot-active { width: 4px; height: 4px; }
.cursor-ring.cursor-ring-down { transform: scale(0.85); }
html.has-cursor * { cursor: none !important; }

/* ─── Section Glass ─── */
.section-glass {
  background: var(--glass-bg); backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px); border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl); margin: 0 24px; padding: 80px 32px;
}
@media (max-width: 768px) {
  .section-glass { margin: 0 12px; padding: 40px 20px; border-radius: var(--radius-lg); }
}

/* ─── Mobile Search Overlay ─── */
@media (max-width: 768px) {
  .search-wrapper {
    position: relative; z-index: 100; max-width: 100%; padding: 0 16px;
    margin-bottom: 20px;
  }
  .search-suggestions {
    position: fixed; top: auto; left: 0; right: 0; bottom: 0;
    max-height: 55vh; border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    z-index: 999; box-shadow: 0 -8px 40px rgba(0,0,0,0.4);
    background: var(--bg-card); border: 1px solid var(--border);
    transform: translateY(100%); opacity: 1; pointer-events: none;
    transition: transform 0.25s ease;
  }
  .search-suggestions.open {
    transform: translateY(0); pointer-events: all;
  }
  .search-backdrop {
    position: fixed; inset: 0; z-index: 998;
    background: rgba(0,0,0,0.3); opacity: 0; pointer-events: none;
    transition: opacity 0.25s ease;
  }
  .search-backdrop.open {
    opacity: 1; pointer-events: all;
  }
  .search-suggestions::before {
    content: ''; display: block; width: 36px; height: 4px;
    background: var(--text-tertiary); border-radius: 4px;
    margin: 10px auto 8px; opacity: 0.5;
  }
  .suggestion-item { padding: 14px 20px; border-bottom: 1px solid var(--border); }
  .suggestion-item:active { background: var(--bg-alt); }
  .suggestion-item-title { font-size: 0.95rem; }
  .suggestion-item-parent { font-size: 0.78rem; }
}

/* ─── Fix spacing below search section ─── */
.section.topics {
  padding-bottom: 40px;
}
.section.topics .topics-grid {
  padding-bottom: 20px;
}

/* ─── Forum Section Styles ─── */
.forum-section {
  background: var(--bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.forum-header {
  text-align: center; padding: 60px 24px 40px;
}
@media (max-width: 768px) {
  .forum-header { padding: 36px 18px 28px; }
  .forum-grid { padding: 0 16px 40px; }
  .forum-features { grid-template-columns: 1fr; margin-top: 20px; padding: 0 16px; }
  .forum-card { padding: 20px; }
}
.forum-header .eyebrow { margin-bottom: 12px; }
.forum-header h2 {
  font-family: var(--font-display); font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800; color: var(--text); margin-bottom: 12px;
}
.forum-header p {
  font-size: 0.95rem; color: var(--text-secondary);
  max-width: 640px; margin: 0 auto; line-height: 1.65;
}
.forum-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px; max-width: var(--max-w); margin: 0 auto;
  padding: 0 24px 60px;
}
.forum-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px;
  transition: all .3s var(--ease-fluid); cursor: default;
}
.forum-card:hover {
  border-color: var(--c-eng-blue);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px var(--shadow-md);
}
[data-theme="dark"] .forum-card:hover { border-color: var(--c-laser-cyan); }
.forum-card-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  background: var(--brand-light); color: var(--c-eng-blue);
  margin-bottom: 16px;
}
[data-theme="dark"] .forum-card-icon {
  background: rgba(0, 229, 255, 0.1); color: var(--c-laser-cyan);
}
.forum-card h3 {
  font-family: var(--font-display); font-size: 1.05rem;
  font-weight: 700; color: var(--text); margin-bottom: 8px;
}
.forum-card p {
  font-size: 0.85rem; color: var(--text-secondary);
  line-height: 1.6; margin-bottom: 16px;
}
.forum-card-tag {
  display: inline-block; font-size: 0.7rem; font-weight: 600;
  padding: 4px 10px; border-radius: var(--radius-full);
  background: var(--brand-light); color: var(--c-eng-blue);
}
[data-theme="dark"] .forum-card-tag {
  background: rgba(0, 229, 255, 0.1); color: var(--c-laser-cyan);
}
.forum-cta {
  text-align: center; padding: 0 24px 60px;
}
.forum-features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; max-width: 800px; margin: 32px auto 0; padding: 0 24px;
}
.forum-feature {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.85rem; color: var(--text-secondary);
}
.forum-feature svg { flex-shrink: 0; color: var(--c-eng-blue); }
[data-theme="dark"] .forum-feature svg { color: var(--c-laser-cyan); }

/* ─── Logo Image Styles ─── */
.nav-logo-img {
  width: 36px; height: 36px; border-radius: 50%;
  object-fit: contain; transition: all .3s var(--ease-fluid);
  cursor: pointer;
}
.nav-logo-img:hover {
  transform: scale(1.1);
  filter: brightness(1.2);
}
.nav-logo-round.logo-vibrate,
.hero-logo-img.logo-vibrate {
  animation: logoVibrate 0.3s ease-in-out;
}
@keyframes logoVibrate {
  0%, 100% { transform: translate(0); }
  10% { transform: translate(-1px, 1px); }
  20% { transform: translate(1px, -1px); }
  30% { transform: translate(-1px, 0); }
  40% { transform: translate(1px, 1px); }
  50% { transform: translate(-1px, -1px); }
  60% { transform: translate(1px, 0); }
  70% { transform: translate(0, 1px); }
  80% { transform: translate(-1px, -1px); }
  90% { transform: translate(1px, 1px); }
}
/* Metallic particles */
.metallic-particle {
  position: fixed; pointer-events: none; z-index: 99999;
  width: 4px; height: 4px; border-radius: 50%;
  background: linear-gradient(135deg, #C0C0C0, #E8E8E8, #A0A0A0);
  box-shadow: 0 0 6px rgba(192,192,192,0.6), 0 0 12px rgba(192,192,192,0.3);
}
@keyframes particleFade {
  0% { opacity: 1; transform: translate(0, 0) scale(1); }
  100% { opacity: 0; transform: translate(var(--tx), var(--ty)) scale(0); }
}
/* Hero logo area */
.hero-logo-wrapper {
  position: relative; display: inline-block; margin-bottom: 20px;
}
.hero-logo-img {
  width: 100px; height: 100px; border-radius: 50%;
  object-fit: contain; cursor: pointer;
  transition: all .4s var(--ease-fluid);
  filter: drop-shadow(0 4px 20px rgba(0,85,255,0.3));
}
.hero-logo-img:hover {
  transform: scale(1.08);
  filter: drop-shadow(0 6px 30px rgba(0,85,255,0.5));
}
/* Navbar round logo button */
.nav-logo-round {
  width: 36px; height: 36px; border-radius: 50%;
  object-fit: contain; cursor: pointer;
  border: 2px solid var(--border);
  transition: all .3s var(--ease-fluid);
  flex-shrink: 0;
}
.nav-logo-round:hover {
  border-color: var(--c-eng-blue);
  transform: scale(1.08);
}
[data-theme="dark"] .nav-logo-round:hover {
  border-color: var(--c-laser-cyan);
}