/* ===========================================
   Visual Focusing — Official Website
   Aesthetic: Warm Editorial (Light)
   =========================================== */

/* ---------- Custom Properties ---------- */
:root {
  --c-bg: #FAFBFF;
  --c-bg-warm: #F0F2FB;
  --c-surface: #FFFFFF;
  --c-surface-alt: #F6F7FD;
  --c-text: #111827;
  --c-text-2: #374151;
  --c-text-3: #6B7280;
  --c-text-4: #9CA3AF;
  --c-accent: #6366F1;
  --c-accent-hover: #4F46E5;
  --c-accent-light: #EEF2FF;
  --c-accent-dim: rgba(99, 102, 241, 0.07);
  --c-accent-glow: rgba(99, 102, 241, 0.15);
  --c-blue: #3B82F6;
  --c-green: #22C55E;
  --c-orange: #F97316;
  --c-purple: #A855F7;
  --c-indigo: #6366F1;
  --c-red: #EF4444;
  --c-yellow: #F59E0B;
  --c-green-dot: #22C55E;
  --border: rgba(0, 0, 0, 0.06);
  --border-accent: rgba(99, 102, 241, 0.25);
  --gradient-brand: linear-gradient(135deg, #3B82F6, #6366F1, #A855F7);

  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Nunito Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'DM Mono', 'SF Mono', 'Menlo', 'Consolas', monospace;

  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
  --section-gap: clamp(5rem, 12vh, 9rem);
  --container: 1140px;
  --nav-h: 64px;
}

html[data-lang="zh-TW"] {
  --font-display: -apple-system, 'PingFang TC', 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
  --font-body: -apple-system, 'PingFang TC', 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text-2);
  background: var(--c-bg);
  background-image:
    radial-gradient(ellipse 55% 45% at 8% 0%, rgba(59, 130, 246, 0.07) 0%, transparent 50%),
    radial-gradient(ellipse 45% 40% at 95% 10%, rgba(168, 85, 247, 0.055) 0%, transparent 48%),
    radial-gradient(ellipse 40% 30% at 85% 55%, rgba(34, 197, 94, 0.04) 0%, transparent 45%),
    radial-gradient(ellipse 45% 35% at 5% 75%, rgba(249, 115, 22, 0.04) 0%, transparent 45%),
    radial-gradient(ellipse 60% 45% at 50% 100%, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
img { display: block; max-width: 100%; }
kbd { font-family: var(--font-mono); }

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

/* ---------- Noise Overlay (subtle grain) ---------- */
.noise {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-expo), transform 0.8s var(--ease-expo);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Section Shared ---------- */
.section-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.75rem;
  font-family: var(--font-body);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}
html[data-lang="zh-TW"] .section-title { font-weight: 700; }
.section-sub {
  color: var(--c-text-3);
  font-size: 15px;
  max-width: 500px;
}

/* ============================
   NAVIGATION
   ============================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: background 0.4s, backdrop-filter 0.4s, box-shadow 0.4s;
}
.nav--scrolled {
  background: rgba(250, 251, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 2rem;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  flex-shrink: 0;
}
.nav__logo img { border-radius: 6px; }
.nav__links {
  display: flex;
  gap: 2rem;
  margin-left: auto;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.nav__links a {
  color: var(--c-text-3);
  transition: color 0.25s;
  position: relative;
}
.nav__links a:hover { color: var(--c-text); }
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--c-accent);
  border-radius: 1px;
  transition: width 0.3s var(--ease-expo);
}
.nav__links a:hover::after { width: 100%; }
.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: 1.5rem;
}
.lang-btn {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--c-text-3);
  transition: border-color 0.25s, color 0.25s, background 0.25s;
}
.lang-btn:hover { border-color: var(--c-accent); color: var(--c-accent); background: var(--c-accent-dim); }
.nav__gh {
  color: var(--c-text-3);
  transition: color 0.25s;
  display: flex;
}
.nav__gh:hover { color: var(--c-text); }
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 20px;
}
.nav__burger span {
  display: block;
  height: 2px;
  background: var(--c-text-3);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ============================
   HERO
   ============================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 700px;
  height: 700px;
  background:
    radial-gradient(circle at 35% 45%, rgba(59, 130, 246, 0.09) 0%, transparent 50%),
    radial-gradient(circle at 65% 55%, rgba(168, 85, 247, 0.07) 0%, transparent 50%);
  pointer-events: none;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3rem;
  padding-top: 3rem;
  padding-bottom: 3rem;
}
.hero__badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent);
  border: 1px solid var(--border-accent);
  padding: 0.35rem 1rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
  background: var(--c-accent-dim);
}
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6.5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.12;
  color: var(--c-text);
  margin-bottom: 1.25rem;
}
html[data-lang="zh-TW"] .hero__title { font-weight: 800; }
.hero__title-line { display: block; }
.hero__title em {
  font-style: italic;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
html[data-lang="zh-TW"] .hero__title em { font-style: normal; }
.hero__sub {
  font-size: 17px;
  color: var(--c-text-3);
  max-width: 460px;
  margin-bottom: 2rem;
  line-height: 1.75;
}
.hero__ctas { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  padding: 0.7rem 1.75rem;
  border-radius: 10px;
  transition: all 0.3s var(--ease-out);
  letter-spacing: 0.01em;
}
.btn--primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 2px 16px rgba(99, 102, 241, 0.25);
}
.btn--primary:hover {
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
  filter: brightness(1.08);
}
.btn--ghost {
  border: 1px solid var(--border);
  color: var(--c-text-2);
  background: var(--c-surface);
}
.btn--ghost:hover {
  border-color: var(--c-text-4);
  background: var(--c-surface-alt);
}

/* Hero Arrow Keys Animation */
.hero__visual {
  flex-shrink: 0;
}
.hero-keys {
  display: grid;
  grid-template-columns: repeat(3, 60px);
  grid-template-rows: repeat(3, 60px);
  gap: 6px;
  place-items: center;
}
.hero-key {
  width: 56px;
  height: 56px;
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-4);
  background: var(--c-surface);
  transition: all 0.5s var(--ease-expo);
  position: relative;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.hero-key--up    { grid-column: 2; grid-row: 1; }
.hero-key--left  { grid-column: 1; grid-row: 2; }
.hero-key--center { grid-column: 2; grid-row: 2; }
.hero-key--right { grid-column: 3; grid-row: 2; }
.hero-key--down  { grid-column: 2; grid-row: 3; }
.hero-key__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-text-4);
}
.hero-key--active {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: var(--c-accent-light);
  box-shadow: 0 2px 16px rgba(99, 102, 241, 0.18), inset 0 0 12px rgba(99, 102, 241, 0.05);
}

/* Hero scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--c-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.25; transform: scaleY(0.6); }
  50% { opacity: 0.6; transform: scaleY(1); }
}

/* ============================
   FEATURES
   ============================ */
.features {
  padding: var(--section-gap) 0;
  position: relative;
}
.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  margin-top: 3rem;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
.feat-card {
  padding: 2.25rem 1.75rem;
  background: var(--c-surface);
  transition: background 0.4s;
}
.feat-card:hover { background: var(--c-surface-alt); }
.feat-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--c-accent-dim);
  color: var(--c-accent);
  margin-bottom: 1.25rem;
}
.feat-card:nth-child(1) .feat-card__icon { background: rgba(59, 130, 246, 0.08); color: var(--c-blue); }
.feat-card:nth-child(2) .feat-card__icon { background: rgba(34, 197, 94, 0.08); color: var(--c-green); }
.feat-card:nth-child(3) .feat-card__icon { background: rgba(249, 115, 22, 0.08); color: var(--c-orange); }
.feat-card:nth-child(4) .feat-card__icon { background: rgba(168, 85, 247, 0.08); color: var(--c-purple); }
.feat-card:nth-child(5) .feat-card__icon { background: rgba(59, 130, 246, 0.08); color: var(--c-blue); }
.feat-card:nth-child(6) .feat-card__icon { background: rgba(99, 102, 241, 0.08); color: var(--c-indigo); }
.feat-card__title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 0.5rem;
}
.feat-card__desc {
  font-size: 14px;
  color: var(--c-text-3);
  line-height: 1.7;
}

/* ============================
   HOW IT WORKS — INTERACTIVE DEMO
   ============================ */
.how-it-works {
  padding: var(--section-gap) 0;
  position: relative;
}

.demo {
  position: relative;
  margin-top: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3.5rem;
}

/* Direction arrows */
.demo__arrow {
  position: absolute;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--c-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-3);
  transition: all 0.3s var(--ease-out);
  z-index: 10;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.demo__arrow:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: var(--c-accent-dim);
}
.demo__arrow--active {
  border-color: var(--c-accent) !important;
  color: var(--c-accent) !important;
  background: var(--c-accent-light) !important;
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.2);
}
.demo__arrow--up    { top: 0; left: 50%; transform: translateX(-50%); }
.demo__arrow--down  { bottom: 0; left: 50%; transform: translateX(-50%); }
.demo__arrow--left  { left: 0; top: 50%; transform: translateY(-50%); }
.demo__arrow--right { right: 0; top: 50%; transform: translateY(-50%); }

/* Desktop surface */
.demo__desktop {
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 10;
  background: linear-gradient(145deg, #E8EAF2, #DFE1EB);
  border: 1px solid var(--border);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0,0,0,0.04);
}

/* Menu bar */
.demo__menubar {
  height: 22px;
  background: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 10px;
  font-size: 10px;
  color: var(--c-text-2);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  backdrop-filter: blur(8px);
}
.demo__apple-icon { font-size: 12px; }

/* Dock */
.demo__dock {
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 5px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(0,0,0,0.04);
}
.demo__dock-item {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--c-text-4);
}
.demo__dock-item--accent { background: var(--c-accent); opacity: 0.6; }

/* Windows */
.demo__win {
  position: absolute;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  transition: all 0.6s var(--ease-expo);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}
.demo__win--active {
  border-color: var(--c-border-accent, var(--border-accent));
  box-shadow: 0 0 0 2px var(--border-accent), 0 4px 20px rgba(99, 102, 241, 0.12);
  z-index: 5 !important;
}

/* Window title bar */
.demo__win-bar {
  height: 24px;
  background: #E4E6F0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
  font-size: 10px;
  color: var(--c-text-2);
}
.demo__win-dots {
  display: flex;
  gap: 4px;
}
.demo__win-dots i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: block;
}
.demo__win-dots i:nth-child(1) { background: var(--c-red); }
.demo__win-dots i:nth-child(2) { background: var(--c-yellow); }
.demo__win-dots i:nth-child(3) { background: var(--c-green-dot); }

/* Window positions */
#win-slack {
  top: 28px;
  left: 3%;
  width: 42%;
  height: 35%;
  z-index: 2;
}
#win-vscode {
  top: 38%;
  left: 2%;
  width: 47%;
  height: 52%;
  z-index: 3;
}
#win-browser {
  top: 28px;
  right: 3%;
  width: 48%;
  height: calc(100% - 58px);
  z-index: 1;
}

/* Window body base */
.demo__win-body {
  height: calc(100% - 24px);
  padding: 6px;
  overflow: hidden;
}

/* Code body */
.demo__win-body--code {
  background: #1E1E2E;
  font-size: 8.5px;
  line-height: 1.65;
  font-family: var(--font-mono);
  padding: 8px;
}
.cl { white-space: nowrap; color: #A8A29E; }
.ck { color: #c792ea; }
.cv { color: #82aaff; }
.cf { color: #ffd580; }
.cs { color: #c3e88d; }
.cn { color: #f78c6c; }

/* Browser body */
.demo__win-body--browser {
  background: #F5F6FC;
}
.fake-url {
  background: #E4E6F0;
  border-radius: 4px;
  margin: 4px;
  padding: 3px 8px;
  font-size: 8px;
  color: var(--c-text-3);
}
.fake-page { padding: 6px; }
.fake-block {
  border-radius: 3px;
  margin-bottom: 5px;
  background: rgba(0, 0, 0, 0.04);
}
.fake-block--heading { width: 60%; height: 10px; background: rgba(0, 0, 0, 0.08); }
.fake-block--text { width: 90%; height: 6px; }
.fake-block--short { width: 65%; }
.fake-block--img { width: 100%; height: 30px; margin-top: 8px; background: rgba(99, 102, 241, 0.08); }

/* Chat body */
.demo__win-body--chat {
  background: #F5F6FC;
  display: flex;
}
.fake-sidebar {
  width: 28%;
  border-right: 1px solid rgba(0, 0, 0, 0.06);
  padding: 4px;
}
.fake-ch {
  height: 8px;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.05);
  margin-bottom: 3px;
}
.fake-ch--active { background: var(--c-accent-dim); border-left: 2px solid var(--c-accent); }
.fake-messages { flex: 1; padding: 6px; }
.fake-msg {
  display: flex;
  gap: 5px;
  align-items: flex-start;
  margin-bottom: 6px;
}
.fake-avatar {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--c-text-4);
  flex-shrink: 0;
}
.fake-bubble {
  height: 8px;
  width: 55%;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.05);
}
.fake-bubble--long { width: 80%; }

/* Keystroke overlay */
.demo__keystroke {
  position: absolute;
  bottom: -2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.demo__keystroke.visible { opacity: 1; }
.demo__keystroke kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  padding: 0 7px;
  font-size: 14px;
  background: var(--c-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--c-text);
  box-shadow: 0 2px 0 rgba(0,0,0,0.06);
}

/* Focus badge */
.demo__focus-badge {
  position: absolute;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-light);
  border: 1px solid var(--border-accent);
  padding: 2px 10px;
  border-radius: 6px;
  pointer-events: none;
  transition: all 0.5s var(--ease-expo);
  opacity: 0;
  z-index: 20;
}
.demo__focus-badge.visible { opacity: 1; }

/* Algorithm steps — illustrated */
.algo {
  margin-top: 4rem;
}
.algo__title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 1.5rem;
  padding: 0 0.25rem;
}
.algo__steps {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.algo__step {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--c-surface);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.algo__step:hover {
  border-color: rgba(0,0,0,0.1);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.algo__illust {
  overflow: hidden;
  border-radius: 8px;
  background: var(--c-surface-alt);
  padding: 0.5rem;
}
.algo__illust svg {
  width: 100%;
  height: auto;
  display: block;
}
.algo__illust text {
  font-family: var(--font-mono);
}
html[data-lang="zh-TW"] .algo__illust text {
  font-family: var(--font-body);
}
.algo__content {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.algo__num {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-accent);
  flex-shrink: 0;
  margin-top: 2px;
}
.algo__step p {
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.6;
}

/* ============================
   SHORTCUTS
   ============================ */
.shortcuts {
  padding: var(--section-gap) 0;
}
.shortcuts__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 3rem;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
.shortcut-card {
  padding: 2.25rem 1.75rem;
  background: var(--c-surface);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  transition: background 0.3s;
}
.shortcut-card:hover { background: var(--c-surface-alt); }
.shortcut-card__keys {
  display: flex;
  gap: 5px;
}
.shortcut-card__keys kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  font-size: 16px;
  background: var(--c-bg);
  border: 1px solid var(--border);
  border-bottom: 3px solid rgba(0,0,0,0.08);
  border-radius: 10px;
  color: var(--c-text);
  transition: all 0.3s;
}
.shortcut-card:hover .shortcut-card__keys kbd {
  border-color: var(--border-accent);
  color: var(--c-accent);
  background: var(--c-accent-dim);
}
.shortcut-card__label {
  font-size: 14px;
  color: var(--c-text-3);
  letter-spacing: 0.01em;
}
.shortcuts__note {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 14px;
  color: var(--c-text-4);
}

/* ============================
   QUICK START
   ============================ */
.quickstart {
  padding: var(--section-gap) 0;
}
.quickstart__steps {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.step {
  display: flex;
  gap: 1.5rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--c-surface);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.step:hover {
  border-color: rgba(0,0,0,0.1);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.step__num {
  font-size: 30px;
  font-weight: 300;
  color: var(--c-accent);
  flex-shrink: 0;
  line-height: 1;
  opacity: 0.5;
  font-family: var(--font-mono);
}
.step__title {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 0.35rem;
}
.step__desc {
  font-size: 15px;
  color: var(--c-text-3);
  line-height: 1.7;
}
.code-block {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--c-bg-warm);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.code-block__label {
  display: block;
  font-size: 12px;
  color: var(--c-text-4);
  margin-bottom: 0.5rem;
}
.code-block pre {
  font-size: 13px;
  color: var(--c-accent);
  white-space: pre-wrap;
  line-height: 1.7;
  font-family: var(--font-mono);
}

/* ============================
   FOOTER
   ============================ */
.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-2);
}
.footer__brand img { border-radius: 4px; }
.footer__license {
  font-size: 13px;
  color: var(--c-text-4);
}
.footer__links {
  display: flex;
  gap: 1.5rem;
  font-size: 13px;
}
.footer__links a {
  color: var(--c-text-3);
  transition: color 0.25s;
}
.footer__links a:hover { color: var(--c-accent); }

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero__sub { margin-left: auto; margin-right: auto; }
  .hero__ctas { justify-content: center; }
  .hero__visual { display: flex; justify-content: center; }
  .shortcuts__grid { grid-template-columns: repeat(2, 1fr); }
  .algo__step { grid-template-columns: 220px 1fr; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .nav--open .nav__links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(248, 247, 244, 0.96);
    backdrop-filter: blur(16px);
    padding: 1rem 1.5rem;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border);
  }
  .nav--open .nav__burger span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .nav--open .nav__burger span:nth-child(2) { opacity: 0; }
  .nav--open .nav__burger span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .demo { padding: 2.5rem 2rem; }
  .demo__desktop { max-width: 100%; }
  .features__grid { grid-template-columns: 1fr; }
  .step { flex-direction: column; gap: 0.75rem; }
  .algo__step { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .shortcuts__grid { grid-template-columns: 1fr 1fr; }
  .hero-keys {
    grid-template-columns: repeat(3, 52px);
    grid-template-rows: repeat(3, 52px);
    gap: 4px;
  }
  .hero-key { width: 48px; height: 48px; }
  .footer__inner { flex-direction: column; text-align: center; }
}