/* ============================================================
   wowTerminal — Landing Page Styles
   Design system: navy + teal + slate · border-driven · terminal motif
   ============================================================ */

:root {
  /* Ink / slate neutrals */
  --ink-0: #f8fafc;
  --ink-50: #f1f5f9;
  --ink-100: #e2e8f0;
  --ink-200: #cbd5e1;
  --ink-300: #64748b;
  --ink-400: #334155;
  --ink-500: #0f172a;

  /* Navy (primary, terminal frames) */
  --navy-500: #112238;
  --navy-600: #0b1727;
  --navy-700: #08111c;

  /* Teal (accent, download, status) */
  --teal-300: #5eead4;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  --teal-tint: #ccfbf1;

  --line: rgba(15, 23, 42, 0.14);
  --line-strong: rgba(17, 34, 56, 0.30);
  --line-dark: rgba(248, 250, 252, 0.12);
  --shadow: 0 18px 50px rgba(8, 17, 28, 0.08);
  --shadow-lg: 0 30px 80px rgba(8, 17, 28, 0.14);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 28px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
  --space-7: 112px;

  --display: clamp(2.6rem, 5vw, 5rem);
  --h1: clamp(2rem, 3vw, 3.25rem);
  --h2: clamp(1.5rem, 2vw, 2.25rem);
  --h3: clamp(1.15rem, 1.4vw, 1.5rem);
  --body: 1rem;
  --caption: 0.875rem;

  --maxw: 1200px;
}

/* ---------- i18n language toggle ----------
   Each translatable string is a .t-ko / .t-en pair; only the active language
   shows. Default (no [data-lang], e.g. JS disabled) falls back to English. */
.t-ko { display: none; }
html[data-lang="ko"] .t-ko { display: inline; }
html[data-lang="ko"] .t-en { display: none; }

/* ---------- Reset & base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  font-family: "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink-500);
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 52%, #e2e8f0 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.7;
  overflow-x: hidden;
}

/* grid children must be allowed to shrink below their content's intrinsic
   width, or the terminal demo's long monospace lines force horizontal overflow */
.hero-grid > *,
.feature-grid > * { min-width: 0; }
.terminal { max-width: 100%; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: "Space Grotesk", "Noto Sans KR", sans-serif;
  letter-spacing: -0.04em;
  line-height: 1.08;
}
h1 { font-size: var(--display); line-height: 0.96; }
h2 { font-size: var(--h1); }
h3 { font-size: var(--h3); }

p { margin: 0; font-size: var(--body); color: rgba(15, 23, 42, 0.82); }
a { color: var(--teal-700); text-decoration: none; }
a:hover { color: var(--teal-600); }
code, kbd {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86em;
}
kbd {
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
}
img { max-width: 100%; display: block; }

/* ---------- Layout helpers ---------- */
.wrap { width: min(var(--maxw), calc(100% - 40px)); margin-inline: auto; }
.section { padding: var(--space-6) 0; }
.section-tight { padding: var(--space-5) 0; }

.eyebrow {
  display: inline-block;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font: 600 0.78rem/1 "Space Grotesk", sans-serif;
  color: var(--teal-600);
  margin-bottom: var(--space-2);
}

.section-head { max-width: 60ch; margin-bottom: var(--space-5); }
.section-head h2 .en { display: block; font-size: 0.5em; color: var(--ink-300); margin-top: 8px; letter-spacing: -0.02em; }
.lede { font-size: 1.12rem; max-width: 60ch; margin-top: var(--space-2); }

/* ---------- Buttons ---------- */
.btn {
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: 600 0.95rem/1 "Space Grotesk", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform .22s ease, background-color .22s ease, border-color .22s ease, box-shadow .22s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--navy-500); color: var(--ink-0); }
.btn-primary:hover { background: var(--navy-600); color: var(--ink-0); box-shadow: var(--shadow); }
.btn-accent { background: var(--teal-600); color: #fff; }
.btn-accent:hover { background: var(--teal-700); color: #fff; box-shadow: 0 12px 30px rgba(13, 148, 136, 0.28); }
.btn-secondary { background: transparent; color: var(--navy-500); border-color: var(--line-strong); }
.btn-secondary:hover { color: var(--navy-500); border-color: var(--navy-500); background: rgba(17, 34, 56, 0.04); }
.btn-sm { min-height: 38px; padding: 0 16px; font-size: 0.85rem; }

/* ---------- Badges & chips ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(45, 212, 191, 0.35);
  background: rgba(45, 212, 191, 0.14);
  font: 600 0.78rem/1 "Space Grotesk", sans-serif;
  color: var(--teal-700);
}
.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  font: 500 0.86rem/1.2 "Space Grotesk", "Noto Sans KR", sans-serif;
  color: var(--ink-400);
}
.badge-row, .chip-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 252, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: 64px;
}
.nav-logo {
  font: 700 1.18rem/1 "Space Grotesk", sans-serif;
  letter-spacing: -0.04em;
  color: var(--navy-500);
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.nav-logo .dot {
  width: 10px; height: 10px; border-radius: 3px;
  background: var(--teal-500);
  box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.18);
}
.logo-mark {
  width: 28px; height: 28px;
  border-radius: 7px;
  display: block;
  box-shadow: 0 1px 3px rgba(8, 17, 28, 0.18);
}
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--ink-400);
  font: 500 0.92rem/1 "Space Grotesk", "Noto Sans KR", sans-serif;
  transition: background-color .18s ease, color .18s ease;
}
.nav-links a:hover { background: rgba(17, 34, 56, 0.06); color: var(--navy-500); }
.nav-cta { margin-left: 8px; }

/* language switcher */
.lang-switch {
  display: inline-flex;
  margin-left: 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: #fff;
}
.lang-switch button {
  border: none;
  background: none;
  padding: 7px 13px;
  font: 600 0.8rem/1 "Space Grotesk", "Noto Sans KR", sans-serif;
  color: var(--ink-300);
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease;
}
.lang-switch button + button { border-left: 1px solid var(--line); }
.lang-switch button:hover { color: var(--navy-500); background: rgba(17,34,56,0.05); }
/* active language (and the no-JS English default) */
html[data-lang="en"] .lang-switch [data-lang-btn="en"],
html[data-lang="ko"] .lang-switch [data-lang-btn="ko"],
html:not([data-lang]) .lang-switch [data-lang-btn="en"] {
  background: var(--navy-500);
  color: #fff;
}
.lang-switch-mobile { margin-left: 0; margin-top: 10px; align-self: flex-start; }
.nav-burger {
  display: none;
  margin-left: auto;
  width: 44px; height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
}
.nav-burger span { width: 20px; height: 2px; background: var(--navy-500); border-radius: 2px; transition: .2s; }
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0 20px;
  border-top: 1px solid var(--line);
}
.nav-mobile a { padding: 12px 8px; border-radius: var(--radius-sm); color: var(--ink-400); font-weight: 500; }
.nav-mobile a:hover { background: rgba(17, 34, 56, 0.06); }
.nav.open .nav-mobile { display: flex; }

/* ============================================================
   TERMINAL WINDOW MOTIF (shared)
   ============================================================ */
.terminal {
  background: var(--navy-700);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  color: #d8e0eb;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.terminal-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  background: var(--navy-600);
  border-bottom: 1px solid var(--line-dark);
  font: 500 0.82rem/1 "Space Grotesk", sans-serif;
  color: #93a4ba;
}
.terminal-dots { display: flex; gap: 7px; }
.terminal-dots span { width: 11px; height: 11px; border-radius: 50%; background: #2a3a4f; }
.terminal-dots span:nth-child(1) { background: #ef6b5e; }
.terminal-dots span:nth-child(2) { background: #f4be4f; }
.terminal-dots span:nth-child(3) { background: #5fc56e; }
.terminal-title { margin-left: 6px; }
.terminal-meta { margin-left: auto; color: #5d7088; }
.terminal-body {
  padding: 22px;
  font: 0.9rem/1.75 "JetBrains Mono", monospace;
  white-space: pre-wrap;
  word-break: break-word;
}
.t-dim { color: #6b7e96; }
.t-green { color: #5fd0a0; }
.t-red { color: #ff8b7e; }
.t-yellow { color: #f4cf6a; }
.t-teal { color: var(--teal-300); }
.t-white { color: #e8eef6; }
.cursor {
  display: inline-block;
  width: 8px; height: 1.05em;
  background: var(--teal-400);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { to { opacity: 0; } }

/* ============================================================
   HERO  (S-004)
   ============================================================ */
.hero { padding-top: var(--space-6); padding-bottom: var(--space-5); }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-5);
  align-items: center;
}
.hero h1 .ko { display: block; }
.hero h1 .en {
  display: block;
  font-size: 0.42em;
  line-height: 1.15;
  margin-top: 16px;
  color: var(--ink-300);
  letter-spacing: -0.02em;
  font-weight: 500;
}
.hero-sub { font-size: 1.12rem; max-width: 52ch; margin-top: var(--space-3); }
.hero-sub .en { display: block; color: var(--ink-300); font-size: 0.94rem; margin-top: 8px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: var(--space-4); }
.hero-aux {
  margin-top: var(--space-3);
  font: 500 0.85rem/1.6 "Space Grotesk", "Noto Sans KR", sans-serif;
  color: var(--ink-300);
  display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center;
}
.hero-aux .sep { color: var(--ink-200); }

/* ============================================================
   PRODUCT SHOWCASE (real screenshot)
   ============================================================ */
.showcase { margin: 0; }
.showcase-img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background: var(--navy-700);
}
.showcase-caps {
  display: flex; flex-wrap: wrap; gap: 10px;
  justify-content: center;
  margin-top: var(--space-3);
}
.showcase-caps .chip { font-family: "JetBrains Mono", "Space Grotesk", monospace; }

/* ============================================================
   VALUE PROPS 3-up  (S-005)
   ============================================================ */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.value-card {
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  transition: border-color .22s ease, transform .22s ease, box-shadow .22s ease;
}
.value-card:hover { border-color: var(--line-strong); transform: translateY(-3px); box-shadow: var(--shadow); }
.value-num {
  font: 600 0.85rem/1 "JetBrains Mono", monospace;
  color: var(--teal-600);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-3);
}
.value-num::after { content: ""; flex: 1; height: 1px; background: var(--line); width: 40px; }
.value-card h3 { margin-bottom: 6px; }
.value-card h3 .en { display: block; font-size: 0.68em; color: var(--ink-300); font-weight: 500; margin-top: 4px; }
.value-card p { font-size: 0.96rem; }
.value-card .en-p { color: var(--ink-300); font-size: 0.86rem; margin-top: 10px; }

/* ============================================================
   USE CASES Before/After  (S-006)
   ============================================================ */
.uc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.uc-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  padding: var(--space-3);
  display: flex; flex-direction: column; gap: 12px;
}
.uc-card h3 { font-size: 1.05rem; }
.uc-step { border-radius: var(--radius-md); padding: 14px 16px; font-size: 0.92rem; }
.uc-label { font: 600 0.7rem/1 "Space Grotesk", sans-serif; letter-spacing: 0.12em; margin-bottom: 7px; display: block; }
.uc-before { background: rgba(15, 23, 42, 0.04); border: 1px dashed var(--line-strong); color: var(--ink-400); }
.uc-before .uc-label { color: var(--ink-300); }
.uc-after { background: rgba(45, 212, 191, 0.10); border: 1px solid rgba(45, 212, 191, 0.4); color: var(--ink-500); }
.uc-after .uc-label { color: var(--teal-700); }
.uc-arrow { text-align: center; color: var(--teal-600); font-size: 1.1rem; line-height: 1; }
.uc-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.uc-tag { font: 600 0.72rem/1 "JetBrains Mono", monospace; color: var(--ink-300); background: rgba(15,23,42,0.05); padding: 5px 9px; border-radius: 6px; }

/* ============================================================
   FEATURE DEEP-DIVE (S-007..S-010)
   ============================================================ */
.feature { padding: var(--space-6) 0; border-top: 1px solid var(--line); }
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: center;
}
.feature.reverse .feature-visual { order: 2; }
.feature.reverse .feature-text { order: 1; }
.feature-text h2 .en { display: block; font-size: 0.5em; color: var(--ink-300); font-weight: 500; margin-top: 8px; letter-spacing: -0.02em; }
.feature-list { list-style: none; padding: 0; margin: var(--space-3) 0 0; display: grid; gap: 14px; }
.feature-list li { display: grid; grid-template-columns: 22px 1fr; gap: 12px; align-items: start; font-size: 0.98rem; }
.feature-list .check {
  width: 22px; height: 22px; border-radius: 7px;
  background: rgba(45, 212, 191, 0.16);
  color: var(--teal-700);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; margin-top: 2px;
}
.feature-list .en { display: block; color: var(--ink-300); font-size: 0.82rem; margin-top: 2px; }
.feature-sub { margin-top: var(--space-4); }
.feature-sub h4 { font: 600 0.78rem/1 "Space Grotesk", sans-serif; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-300); margin-bottom: 12px; }

/* AI command card inside terminal demo */
.cmd-card {
  margin: 14px 16px 16px;
  background: rgba(20, 184, 166, 0.08);
  border: 1px solid rgba(45, 212, 191, 0.35);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex; align-items: center; gap: 12px;
  font-family: "JetBrains Mono", monospace;
}
.cmd-card .cmd-text { color: var(--teal-300); font-size: 0.85rem; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cmd-card .send-btn {
  border: 1px solid var(--teal-500);
  background: var(--teal-600);
  color: #fff;
  border-radius: 999px;
  padding: 7px 13px;
  font: 600 0.74rem/1 "Space Grotesk", sans-serif;
  cursor: pointer; white-space: nowrap;
}
.ai-bubble {
  margin: 0 16px;
  padding: 14px 16px;
  background: rgba(248, 250, 252, 0.06);
  border-left: 2px solid var(--teal-500);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font: 0.86rem/1.7 "Noto Sans KR", sans-serif;
  color: #c6d2e1;
}
.ai-bubble code { color: var(--teal-300); background: rgba(20,184,166,0.12); padding: 1px 5px; border-radius: 4px; }
.ai-bubble .who { display: block; font: 600 0.72rem/1 "Space Grotesk", sans-serif; color: var(--teal-400); letter-spacing: 0.08em; margin-bottom: 8px; }

/* SFTP dual pane mock */
.sftp { font-family: "JetBrains Mono", monospace; }
.sftp-cols { display: grid; grid-template-columns: 1fr 36px 1fr; }
.sftp-pane { padding: 16px 14px; }
.sftp-pane.local { border-right: 1px solid var(--line-dark); }
.sftp-pane .pane-h { color: #7f93ab; font-size: 0.74rem; letter-spacing: 0.08em; margin-bottom: 12px; text-transform: uppercase; }
.sftp-row { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; font-size: 0.82rem; color: #cdd8e6; }
.sftp-row .sz { color: #6b7e96; }
.sftp-row.dir { color: var(--teal-300); }
.sftp-mid { display: flex; align-items: center; justify-content: center; color: var(--teal-400); font-size: 1.1rem; background: rgba(20,184,166,0.06); }
.sftp-progress { padding: 12px 16px; border-top: 1px solid var(--line-dark); }
.sftp-progress .pl { display: flex; justify-content: space-between; font-size: 0.74rem; color: #93a4ba; margin-bottom: 8px; }
.sftp-bar { height: 6px; border-radius: 999px; background: rgba(248,250,252,0.10); overflow: hidden; }
.sftp-bar i { display: block; height: 100%; width: 68%; background: linear-gradient(90deg, var(--teal-500), var(--teal-300)); border-radius: 999px; }

/* terminal core: tabs + split */
.core-tabs { display: flex; gap: 0; background: var(--navy-600); border-bottom: 1px solid var(--line-dark); padding: 0 8px; }
.core-tab { padding: 11px 16px; font: 500 0.8rem/1 "Space Grotesk", sans-serif; color: #7f93ab; border-bottom: 2px solid transparent; }
.core-tab.active { color: #e8eef6; border-bottom-color: var(--teal-400); }
.core-split { display: grid; grid-template-columns: 1fr 1fr; }
.core-split .pane { padding: 18px; font: 0.82rem/1.7 "JetBrains Mono", monospace; }
.core-split .pane:first-child { border-right: 1px solid var(--line-dark); }

/* ============================================================
   UI / i18n  (S-011)
   ============================================================ */
.lang-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: var(--space-2); }
.lang-grid .chip { background: rgba(255,255,255,0.8); }
.ui-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); margin-top: var(--space-4); }
.ui-card { border: 1px solid var(--line); border-radius: var(--radius-lg); padding: var(--space-3); background: rgba(255,255,255,0.72); }
.ui-card h4 { font-size: 1rem; margin-bottom: 8px; }
.ui-card p { font-size: 0.9rem; }
.theme-mini { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.theme-mini > div { border-radius: var(--radius-md); padding: 12px; font: 0.72rem/1.4 "JetBrains Mono", monospace; border: 1px solid var(--line); }
.theme-mini .dark { background: var(--navy-700); color: #cbd5e1; border-color: var(--line-dark); }
.theme-mini .light { background: #fff; color: var(--ink-500); }

/* ============================================================
   SECURITY  (S-012)
   ============================================================ */
.security { background: var(--navy-600); color: #cdd8e6; border-radius: var(--radius-xl); padding: var(--space-6) var(--space-5); }
.security .eyebrow { color: var(--teal-400); }
.security h2 { color: #fff; }
.security h2 .en { display: block; font-size: 0.5em; color: #7f93ab; font-weight: 500; margin-top: 10px; letter-spacing: -0.02em; }
.security-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3); margin-top: var(--space-4); }
.sec-item { display: grid; grid-template-columns: 26px 1fr; gap: 14px; align-items: start; padding: var(--space-3); border: 1px solid var(--line-dark); border-radius: var(--radius-md); background: rgba(248,250,252,0.03); }
.sec-item .lock { width: 26px; height: 26px; border-radius: 8px; background: rgba(45,212,191,0.16); color: var(--teal-300); display: inline-flex; align-items: center; justify-content: center; font-size: 0.85rem; margin-top: 2px; }
.sec-item p { color: #aebccd; font-size: 0.92rem; }
.sec-item strong { color: #fff; }
.sec-item .en { display: block; color: #6b7e96; font-size: 0.8rem; margin-top: 6px; }

/* ============================================================
   TECH STACK  (S-013)
   ============================================================ */
.stack-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--space-3); margin-top: var(--space-4); }
.stack-item { border: 1px solid var(--line); border-radius: var(--radius-md); padding: var(--space-3); background: rgba(255,255,255,0.72); text-align: left; }
.stack-item .k { font: 600 0.72rem/1 "Space Grotesk", sans-serif; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-300); }
.stack-item .v { font: 600 0.98rem/1.3 "JetBrains Mono", monospace; color: var(--navy-500); margin-top: 8px; }

/* ============================================================
   DOWNLOAD  (S-014)
   ============================================================ */
.download { text-align: center; }
.download .section-head { margin-inline: auto; }
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); margin-top: var(--space-4); }
.dl-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-3);
  background: rgba(255,255,255,0.78);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
  color: var(--navy-500);
}
.dl-card:hover { border-color: var(--teal-500); transform: translateY(-3px); box-shadow: var(--shadow); color: var(--navy-500); }
.dl-os { font: 700 1.05rem/1.2 "Space Grotesk", sans-serif; }
.dl-detail { font-size: 0.82rem; color: var(--ink-300); }
.dl-glyph { font-family: "JetBrains Mono", monospace; font-size: 1.4rem; color: var(--teal-600); margin-bottom: 6px; }

/* ============================================================
   FAQ  (S-015)
   ============================================================ */
.faq-list { max-width: 820px; margin-inline: auto; display: grid; gap: 10px; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius-md); background: rgba(255,255,255,0.78); overflow: hidden; }
.faq-q {
  width: 100%; text-align: left; cursor: pointer;
  background: none; border: none;
  padding: 18px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  font: 600 1rem/1.4 "Noto Sans KR", "Space Grotesk", sans-serif;
  color: var(--navy-500);
}
.faq-q .en { display: block; font-size: 0.8rem; color: var(--ink-300); font-weight: 500; margin-top: 3px; }
.faq-q .mark { flex: none; width: 24px; height: 24px; color: var(--teal-600); transition: transform .25s ease; font-size: 1.1rem; line-height: 24px; text-align: center; }
.faq-item.open .faq-q .mark { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a-inner { padding: 0 20px 18px; color: rgba(15,23,42,0.78); font-size: 0.95rem; }
.faq-a-inner .en { display: block; color: var(--ink-300); font-size: 0.85rem; margin-top: 6px; }

/* ============================================================
   UNSIGNED NOTICE  (S-016)
   ============================================================ */
.notice {
  border: 1px solid rgba(244, 191, 79, 0.5);
  background: rgba(244, 191, 79, 0.10);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: grid; grid-template-columns: 40px 1fr; gap: 18px; align-items: start;
}
.notice .ico { width: 40px; height: 40px; border-radius: 10px; background: rgba(244, 191, 79, 0.22); color: #a16207; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; }
.notice h4 { font-size: 1.05rem; margin-bottom: 8px; }
.notice p { font-size: 0.92rem; }
.notice .os-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.notice .os-row > div { border-left: 3px solid rgba(244,191,79,0.6); padding-left: 14px; }
.notice .os-row strong { display: block; margin-bottom: 4px; }
.notice .en { color: var(--ink-300); font-size: 0.84rem; margin-top: 6px; }
@media (max-width: 720px) { .notice .os-row { grid-template-columns: 1fr; } }

/* ============================================================
   FOOTER  (S-017)
   ============================================================ */
.footer-cta {
  background: var(--navy-500);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-5);
  text-align: center;
  color: #fff;
  box-shadow: var(--shadow-lg);
}
.footer-cta h2 { color: #fff; }
.footer-cta h2 .en { display: block; font-size: 0.5em; color: #8fa1b8; font-weight: 500; margin-top: 10px; }
.footer-cta .hero-cta { justify-content: center; margin-top: var(--space-4); }
.footer {
  padding: var(--space-5) 0 var(--space-6);
}
.footer-inner { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; justify-content: space-between; padding-top: var(--space-4); border-top: 1px solid var(--line); }
.footer-links { display: flex; flex-wrap: wrap; gap: 6px; }
.footer-links a { padding: 8px 12px; border-radius: var(--radius-sm); color: var(--ink-400); font: 500 0.9rem/1 "Space Grotesk", "Noto Sans KR", sans-serif; }
.footer-links a:hover { background: rgba(17,34,56,0.06); color: var(--navy-500); }
.footer-meta { color: var(--ink-300); font-size: 0.85rem; }

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .cursor { animation: none; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .hero-visual { order: -1; }
  .feature-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  .feature.reverse .feature-visual, .feature.reverse .feature-text { order: 0; }
  .value-grid { grid-template-columns: 1fr; }
  .uc-grid { grid-template-columns: 1fr; }
  .ui-cards { grid-template-columns: 1fr; }
  .security-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: repeat(2, 1fr); }
  .dl-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .nav-cta.desktop { display: none; }
  .nav-inner .lang-switch { display: none; }
  .nav-burger { display: flex; }
}
@media (max-width: 520px) {
  .stack-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .section { padding: var(--space-5) 0; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   CHANGELOG PAGE — version timeline
   ============================================================ */
.cl-hero { padding-top: var(--space-6); padding-bottom: var(--space-4); }
.cl-hero h1 { font-size: clamp(2.2rem, 4vw, 3.5rem); }
.cl-hero h1 .en { display: block; font-size: 0.42em; color: var(--ink-300); font-weight: 500; margin-top: 12px; letter-spacing: -0.02em; }
.cl-hero .lede { margin-top: var(--space-3); }

.timeline { position: relative; margin: var(--space-5) 0 var(--space-6); }
/* vertical spine */
.timeline::before {
  content: "";
  position: absolute;
  left: 11px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal-400), var(--line));
}
.cl-entry { position: relative; padding-left: 44px; margin-bottom: var(--space-5); }
.cl-entry::before {
  content: "";
  position: absolute;
  left: 4px; top: 6px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 3px solid var(--teal-500);
  box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.12);
}
.cl-entry.unreleased::before { border-color: var(--ink-200); box-shadow: none; background: var(--ink-50); }

.cl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; margin-bottom: var(--space-2); }
.cl-ver {
  font: 700 1.5rem/1 "Space Grotesk", sans-serif;
  letter-spacing: -0.03em;
  color: var(--navy-500);
}
.cl-ver a { color: inherit; }
.cl-ver a:hover { color: var(--teal-600); }
.cl-date { font: 500 0.85rem/1 "JetBrains Mono", monospace; color: var(--ink-300); }
.cl-latest {
  font: 600 0.68rem/1 "Space Grotesk", sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff; background: var(--teal-600);
  padding: 5px 9px; border-radius: 999px;
}

.cl-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  padding: var(--space-3) var(--space-4);
}
.cl-group { margin-top: var(--space-2); }
.cl-group:first-child { margin-top: 0; }
.cl-label {
  display: inline-flex; align-items: center;
  font: 600 0.7rem/1 "Space Grotesk", sans-serif;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 5px 10px; border-radius: 999px;
  margin-bottom: 10px;
}
.cl-label.added   { color: var(--teal-700); background: rgba(45, 212, 191, 0.14); border: 1px solid rgba(45,212,191,0.35); }
.cl-label.changed { color: #a16207; background: rgba(244, 191, 79, 0.14); border: 1px solid rgba(244,191,79,0.4); }
.cl-label.fixed   { color: #1d4ed8; background: rgba(59, 130, 246, 0.12); border: 1px solid rgba(59,130,246,0.32); }
.cl-label.removed { color: #b91c1c; background: rgba(239, 68, 68, 0.10); border: 1px solid rgba(239,68,68,0.3); }
.cl-list { list-style: none; padding: 0; margin: 0 0 var(--space-2); display: grid; gap: 9px; }
.cl-list li { position: relative; padding-left: 18px; font-size: 0.96rem; line-height: 1.6; color: rgba(15,23,42,0.85); }
.cl-list li::before { content: "–"; position: absolute; left: 0; color: var(--teal-600); }
.cl-list .ref { font: 600 0.78rem/1 "JetBrains Mono", monospace; color: var(--ink-300); }
.cl-unreleased-note { color: var(--ink-300); font-size: 0.95rem; }

.cl-foot-note { color: var(--ink-300); font-size: 0.9rem; margin-top: var(--space-4); }