/* ==============================================================
   TenetCode — Design System
   Stone neutrals · Muted emerald accent · Editorial typography
   No gradients. Premium. Trustworthy.
   ============================================================== */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=JetBrains+Mono:wght@400;500&display=swap");
@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.css");

:root {
  --bg: #f5f5f4;
  --bg-elev: #fafaf9;
  --surface: #ffffff;
  --ink: #1c1917;
  --ink-2: #292524;
  --ink-3: #57534e;
  --ink-4: #78716c;
  --line: #e7e5e4;
  --line-2: #d6d3d1;
  --line-strong: #a8a29e;

  --dark-bg: #0c0a09;
  --dark-ink: #f5f5f4;
  --dark-ink-2: #d6d3d1;
  --dark-ink-3: #a8a29e;
  --dark-line: #292524;
  --dark-line-2: #44403c;

  --accent: #047857;
  --accent-soft: #ecfdf5;
  --accent-ink: #064e3b;

  --font-sans: "Inter", "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, "Noto Sans KR", sans-serif;
  --font-serif: "Fraunces", "Inter", "Pretendard Variable", serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;

  --container: 1240px;
  --radius: 4px;
  --radius-lg: 10px;

  --space-section: 160px;
  --space-head: 56px;
}

:lang(ko), html[lang="ko"] body {
  --font-sans: "Pretendard Variable", "Pretendard", "Inter", -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
  font-feature-settings: "ss01", "cv11";
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, textarea { font: inherit; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

.mono { font-family: var(--font-mono); font-size: 0.78em; letter-spacing: 0.06em; text-transform: uppercase; font-weight: 500; }
.text-right { text-align: right; }

/* ============================================================
   Reveal animation
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.8s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}
.reveal-in { opacity: 1; transform: translateY(0); }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40;
  background: rgba(245, 245, 244, 0.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s;
}
.nav-scrolled {
  background: rgba(245, 245, 244, 0.92);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 40px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px;
}
.nav-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.nav-mark { color: var(--ink); display: inline-flex; }
.nav-wordmark { font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--ink-2);
  padding: 6px 0; position: relative;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: var(--ink);
  transition: width 0.35s ease;
}
.nav-links a:hover::after { width: 100%; }

.nav-right { display: flex; align-items: center; gap: 16px; }
.lang-toggle {
  display: inline-flex; align-items: center;
  border: 1px solid var(--line-2); border-radius: 999px;
  padding: 4px 4px; gap: 0;
  background: var(--bg-elev);
}
.lang-toggle button {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: 0.08em;
  padding: 6px 10px; border-radius: 999px;
  color: var(--ink-4);
  transition: color 0.2s, background 0.2s;
}
.lang-toggle button.on { background: var(--ink); color: var(--bg); }
.lang-divider { width: 1px; height: 12px; background: var(--line-2); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  font-size: 14px; font-weight: 500;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn-lg { padding: 14px 22px; font-size: 15px; }
.btn-dark {
  background: var(--ink); color: var(--bg);
  border-color: var(--ink);
}
.btn-dark:hover { background: #000; border-color: #000; transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--ink); border-color: var(--line-2);
}
.btn-ghost:hover { background: var(--bg-elev); border-color: var(--line-strong); }
.btn-arrow { transition: transform 0.25s; }
.btn:hover .btn-arrow { transform: translateX(3px); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  padding: 160px 0 40px;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 80px;
  align-items: center;
  min-height: 620px;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  color: var(--ink-3); text-transform: uppercase; font-weight: 500;
  padding: 6px 12px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--bg-elev);
  margin-bottom: 32px;
}
.dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 3px rgba(4, 120, 87, 0.15);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(4, 120, 87, 0.15); }
  50% { box-shadow: 0 0 0 6px rgba(4, 120, 87, 0); }
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 450;
  font-size: clamp(40px, 5.6vw, 80px);
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--ink);
  margin-bottom: 36px;
  text-wrap: balance;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
.hero-title-line {
  display: block;
}
.hero-title-accent {
  display: block;
  font-style: italic;
  font-weight: 350;
  color: var(--ink-3);
  letter-spacing: -0.04em;
  font-variation-settings: "opsz" 144, "SOFT" 60;
}

.hero-sub {
  font-size: 19px; line-height: 1.55;
  color: var(--ink-3);
  max-width: 560px;
  margin-bottom: 40px;
  text-wrap: pretty;
}

.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 56px; }

.hero-meta {
  display: flex; gap: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-3);
}
.hero-meta .mono { color: var(--ink-4); margin-right: 8px; }

.hero-visual { position: relative; }
.hero-visual-frame {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 480px;
  margin-left: auto;
  background:
    linear-gradient(transparent 50%, rgba(168, 162, 158, 0.06) 50%) 0 0 / 100% 32px,
    var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  color: var(--ink-2);
}

.frame-corner {
  position: absolute; width: 10px; height: 10px;
  border: 1.5px solid var(--ink);
}
.frame-corner.tl { top: -5px; left: -5px; border-right: 0; border-bottom: 0; }
.frame-corner.tr { top: -5px; right: -5px; border-left: 0; border-bottom: 0; }
.frame-corner.bl { bottom: -5px; left: -5px; border-right: 0; border-top: 0; }
.frame-corner.br { bottom: -5px; right: -5px; border-left: 0; border-top: 0; }

.net-diagram { width: 100%; height: auto; color: var(--ink); }
.net-edge {
  stroke-dasharray: 120;
  stroke-dashoffset: 120;
  animation: edge-in 1.6s ease forwards;
}
@keyframes edge-in { to { stroke-dashoffset: 0; } }
.net-halo { animation: halo-pulse 3s ease-in-out infinite; transform-origin: center; }
@keyframes halo-pulse {
  0%, 100% { opacity: 0.4; r: 11; }
  50% { opacity: 0.1; r: 16; }
}

.visual-caption {
  position: absolute; bottom: 16px; left: 32px; right: 32px;
  display: flex; gap: 10px; align-items: center;
  font-size: 11px; color: var(--ink-4); font-family: var(--font-mono);
  letter-spacing: 0.04em;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

/* Ticker */
.hero-ticker {
  margin-top: 80px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 80px, #000 calc(100% - 80px), transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 80px, #000 calc(100% - 80px), transparent);
}
.ticker-track {
  display: flex; gap: 0; white-space: nowrap;
  animation: ticker 60s linear infinite;
}
.ticker-row {
  display: inline-flex; gap: 40px; padding-right: 40px; align-items: center;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.18em;
  color: var(--ink-3);
}
.tk-sep { color: var(--accent); }
@keyframes ticker { to { transform: translateX(-50%); } }

/* ============================================================
   SECTION COMMONS
   ============================================================ */
.section {
  padding: var(--space-section) 0;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.section-dark {
  background: var(--dark-bg);
  color: var(--dark-ink);
  border-bottom-color: var(--dark-line);
}
.section-dark .sec-label-text { color: var(--dark-ink-3); }
.section-dark .sec-label-line { background: var(--dark-line-2); }
.section-dark .section-lead { color: var(--dark-ink-2); }

.sec-label {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 40px;
}
.sec-label-line { width: 40px; height: 1px; background: var(--line-strong); }
.sec-label-text {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  color: var(--ink-3); text-transform: uppercase; font-weight: 500;
}

.section-head { max-width: 960px; margin-bottom: 72px; }
.section-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(36px, 4.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: inherit;
  text-wrap: balance;
  margin-bottom: 24px;
}
.section-lead {
  font-size: 19px; line-height: 1.55; color: var(--ink-3);
  max-width: 680px; text-wrap: pretty;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: start;
}
.about-right { display: flex; flex-direction: column; gap: 40px; }
.about-right .section-lead { font-size: 18px; }
.pillars { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.pillar {
  display: grid; grid-template-columns: 140px 1fr;
  gap: 24px; padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.pillar-key { color: var(--ink-4); }
.pillar-value { color: var(--ink); font-size: 16px; }

/* ============================================================
   TECHNOLOGY
   ============================================================ */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tech-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 32px 36px;
  transition: border-color 0.25s, transform 0.25s;
  position: relative;
  color: var(--ink);
}
.tech-card:hover { border-color: var(--ink); transform: translateY(-2px); }
.tech-card-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 40px;
}
.tech-card-n { color: var(--ink-4); }
.tech-icon { color: var(--ink); }
.tech-card-title {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 26px; line-height: 1.2; margin-bottom: 14px;
  letter-spacing: -0.015em;
}
.tech-card-blurb {
  font-size: 15px; color: var(--ink-3); line-height: 1.55;
  margin-bottom: 24px;
}
.tech-card-bullets {
  padding-top: 20px; border-top: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 10px;
}
.tech-card-bullets li {
  display: flex; align-items: center; gap: 10px;
  font-size: 14px; color: var(--ink-2);
}
.bullet-tick {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  flex-shrink: 0;
}

/* ============================================================
   AI
   ============================================================ */
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.ai-card {
  padding: 36px 32px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  transition: background 0.25s;
  position: relative;
  cursor: pointer;
}
.ai-card:hover { background: var(--surface); }
.ai-card-num { color: var(--ink-4); margin-bottom: 28px; }
.ai-card-title {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 22px; line-height: 1.25; letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.ai-card-blurb {
  font-size: 14.5px; color: var(--ink-3); line-height: 1.6;
  margin-bottom: 28px;
}
.ai-card-foot {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--ink-4);
  padding-top: 20px; border-top: 1px solid var(--line);
  transition: color 0.25s;
}
.ai-card:hover .ai-card-foot { color: var(--accent); }
.ai-arrow { transition: transform 0.25s; }
.ai-card:hover .ai-arrow { transform: translateX(4px); }

/* ============================================================
   PROBLEMS (dark)
   ============================================================ */
.section-problems .section-title,
.section-quote .section-title { color: var(--dark-ink); }
.problems-list { border-top: 1px solid var(--dark-line-2); }
.problem-row {
  display: grid;
  grid-template-columns: 80px 1fr 2fr;
  gap: 40px;
  padding: 36px 0;
  border-bottom: 1px solid var(--dark-line-2);
  align-items: center;
  transition: background 0.3s;
}
.problem-row:hover { background: rgba(255,255,255,0.02); }
.problem-n { color: var(--dark-ink-3); }
.problem-name {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 26px; letter-spacing: -0.01em;
  color: var(--dark-ink);
}
.problem-blurb { font-size: 15px; line-height: 1.55; color: var(--dark-ink-2); }

/* ============================================================
   STRENGTHS
   ============================================================ */
.strengths-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.strength-card {
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: all 0.25s;
  position: relative;
}
.strength-card:hover { border-color: var(--ink); }
.strength-head { margin-bottom: 32px; }
.strength-n { color: var(--ink-4); }
.strength-name {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 20px; line-height: 1.25; letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.strength-blurb { font-size: 14.5px; line-height: 1.6; color: var(--ink-3); }

/* ============================================================
   PARTNERS
   ============================================================ */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.partner-card {
  padding: 36px 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  display: flex; flex-direction: column;
  gap: 28px;
  min-height: 200px;
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.25s, transform 0.25s;
}
.partner-card:hover { border-color: var(--ink); transform: translateY(-2px); }
.partner-card--static { cursor: default; }
.partner-card--static:hover { border-color: var(--line); transform: none; }

.partner-logo {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  min-height: 64px;
  padding: 8px 0;
}
.partner-logo img {
  max-width: 160px;
  max-height: 56px;
  object-fit: contain;
}
.partner-logo-invert { filter: invert(1); }
.partner-logo--text { display: flex; }
.partner-mark {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 44px; letter-spacing: -0.02em;
  color: var(--ink-3);
  line-height: 1;
}

.partner-info {
  display: flex; flex-direction: column; gap: 6px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.partner-name {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 18px; letter-spacing: -0.01em;
  color: var(--ink);
}
.partner-en {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px;
  color: var(--ink-4);
  font-size: 11px;
}
.partner-arrow {
  color: var(--ink-4);
  transition: color 0.25s, transform 0.25s;
}
.partner-card:hover .partner-arrow {
  color: var(--accent);
  transform: translate(2px, -2px);
}

/* ============================================================
   LIBERDROP
   ============================================================ */
.liber-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center;
}
.liber-title { margin-bottom: 20px; }
.liber-points {
  display: flex; flex-direction: column; gap: 14px;
  margin: 32px 0;
}
.liber-points li {
  display: flex; align-items: center; gap: 14px;
  font-size: 15px; color: var(--ink-2);
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.liber-bullet {
  width: 6px; height: 6px; background: var(--accent); border-radius: 50%;
  flex-shrink: 0;
}
.liber-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 48px;
  overflow: hidden;
}
.liber-diagram {
  width: 100%; height: 100%;
  display: grid; grid-template-columns: 1fr 1.2fr 1fr;
  align-items: center; gap: 16px;
  position: relative;
}
.liber-node {
  aspect-ratio: 1;
  border: 1.5px solid var(--ink);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  background: var(--surface);
  position: relative;
  border-radius: var(--radius-lg);
}
.liber-node::before {
  content: ""; position: absolute; inset: 6px;
  border: 1px solid var(--line-2);
  border-radius: 6px;
}
.liber-node-label {
  font-family: var(--font-serif); font-weight: 500;
  font-size: 36px; letter-spacing: -0.02em;
  color: var(--ink);
}
.liber-node-sub { color: var(--ink-4); font-size: 10px; margin-top: 4px; }
.liber-path { position: relative; height: 100%; display: flex; align-items: center; }
.liber-path-line {
  width: 100%; height: 1.5px; background: var(--ink);
  position: relative;
}
.liber-path-line::before, .liber-path-line::after {
  content: ""; position: absolute; top: 50%; transform: translateY(-50%);
  width: 8px; height: 8px; background: var(--ink); border-radius: 50%;
}
.liber-path-line::before { left: -2px; }
.liber-path-line::after { right: -2px; }
.liber-path-packet {
  position: absolute; top: 50%;
  width: 14px; height: 14px;
  background: var(--accent);
  border-radius: 2px;
  transform: translateY(-50%);
  animation: packet 3s cubic-bezier(0.45, 0, 0.55, 1) infinite;
  box-shadow: 0 0 0 4px var(--accent-soft);
}
@keyframes packet {
  0% { left: 0%; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { left: calc(100% - 14px); opacity: 0; }
}
.liber-path-label {
  position: absolute; top: calc(50% - 32px); left: 50%; transform: translateX(-50%);
  color: var(--accent); white-space: nowrap;
  background: var(--bg-elev); padding: 4px 8px;
}
.liber-cloud {
  position: absolute; bottom: -24px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.liber-cloud-line { width: 1px; height: 20px; background: var(--line-2); border-left: 1px dashed var(--line-strong); }
.liber-cloud-label { color: var(--ink-4); }
.strike { text-decoration: line-through; }

/* ============================================================
   QUOTE
   ============================================================ */
.quote-container { max-width: 960px; }
.quote-text {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.32; letter-spacing: -0.015em;
  color: var(--dark-ink);
  margin: 32px 0 40px;
  text-wrap: pretty;
  position: relative;
  font-style: italic;
}
.quote-mark {
  font-family: var(--font-serif);
  font-size: 2em; line-height: 0.5;
  color: var(--accent);
  display: inline-block;
  margin-right: 12px;
  vertical-align: -0.2em;
}
.quote-attrib {
  padding-top: 24px;
  border-top: 1px solid var(--dark-line-2);
  display: flex; align-items: baseline; gap: 20px;
}
.quote-author { font-weight: 500; font-size: 16px; color: var(--dark-ink); }
.quote-role { color: var(--dark-ink-3); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; border-top: 1px solid var(--line); margin-top: 40px; }
.contact-info-row {
  display: grid; grid-template-columns: 120px 1fr;
  gap: 24px; padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.contact-info-k { color: var(--ink-4); }
.contact-info-v { color: var(--ink); font-size: 15px; }
.contact-info-v a { border-bottom: 1px solid var(--ink-4); }
.contact-info-v a:hover { border-bottom-color: var(--accent); color: var(--accent); }

.contact-cta {
  display: flex; flex-direction: column; gap: 28px; align-items: flex-start;
  padding-top: 8px;
}
.contact-cta-copy {
  font-size: 17px; line-height: 1.55; color: var(--ink-3);
  max-width: 460px;
  text-wrap: pretty;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--dark-bg); color: var(--dark-ink);
  padding: 80px 0 32px;
}
.footer-top {
  display: grid; grid-template-columns: 1.2fr 2fr; gap: 80px;
  padding-bottom: 64px;
  border-bottom: 1px solid var(--dark-line-2);
}
.footer-mark {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 18px;
  margin-bottom: 20px;
  color: var(--dark-ink);
}
.footer-tagline { color: var(--dark-ink-3); font-size: 14px; max-width: 300px; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.footer-col-title { color: var(--dark-ink-3); margin-bottom: 20px; }
.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col a {
  font-size: 14px; color: var(--dark-ink-2);
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 32px;
  color: var(--dark-ink-3);
}
.footer-meta { display: flex; gap: 10px; align-items: center; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; min-height: auto; padding-top: 40px; }
  .hero-visual-frame { max-width: 420px; margin: 0 auto; }
  .about-grid, .contact-grid, .liber-grid { grid-template-columns: 1fr; gap: 48px; }
  .tech-grid, .strengths-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; }
  .problem-row { grid-template-columns: 60px 1fr 1.6fr; gap: 24px; }
}
@media (max-width: 720px) {
  :root { --space-section: 88px; }
  .container, .nav-inner, .hero-grid { padding-left: 20px; padding-right: 20px; }
  .nav-links { display: none; }
  .nav-inner { padding: 14px 20px; gap: 16px; }
  .hero { padding-top: 120px; }
  .tech-grid, .strengths-grid, .ai-grid, .partners-grid { grid-template-columns: 1fr; }
  .hero-meta { flex-wrap: wrap; gap: 16px; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .section-title { font-size: 36px; }
  .hero-title { font-size: 42px; letter-spacing: -0.03em; }
  .problem-row { grid-template-columns: 40px 1fr; gap: 16px; align-items: start; }
  .problem-row .problem-name { grid-column: 2; }
  .problem-row .problem-blurb { grid-column: 2; }
}