/* ============================================================
   DGURU — Design System
   Dark hi-tech: deep navy base · electric blue / cyan accents
   ============================================================ */

:root {
  color-scheme: dark;
  /* palette */
  --bg-0: #030812;
  --bg-1: #060f1f;
  --bg-2: #0a1830;
  --surface: rgba(148, 180, 255, 0.04);
  --surface-hover: rgba(148, 180, 255, 0.08);
  --line: rgba(148, 180, 255, 0.12);
  --line-strong: rgba(148, 180, 255, 0.25);

  --blue: #4d8dff;
  --blue-deep: #1f5eff;
  --cyan: #2dd9ff;
  --ci: #7a181d;         /* DGURU CI burgundy (logo mark only — too dark for text on dark bg) */
  --ci-bright: #e05561;  /* CI-derived accent, WCAG-safe on dark backgrounds */

  --text-0: #eef4ff;
  --text-1: #aebdda;
  --text-2: #7d8fb3;

  --grad-main: linear-gradient(100deg, #4d8dff 0%, #2dd9ff 100%);
  --grad-text: linear-gradient(100deg, #dce9ff 0%, #7fb4ff 50%, #2dd9ff 100%);

  /* type */
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
  --font-display: "Space Grotesk", "Pretendard Variable", Pretendard, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* layout */
  --w-max: 1200px;
  --nav-h: 72px;
  --radius: 18px;
  --radius-sm: 12px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-0);
  color: var(--text-0);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  /* 한글 어절 단위 줄바꿈: 단어 중간에서 끊기는 현상 방지 (예: 전환합니/다) */
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(77, 141, 255, 0.35); }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
strong { color: var(--text-0); font-weight: 700; }

/* ---------- background canvas ---------- */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
}

.bg-vignette {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 75% -10%, rgba(31, 94, 255, 0.16), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(45, 217, 255, 0.07), transparent 60%),
    linear-gradient(180deg, rgba(3, 8, 18, 0) 0%, rgba(3, 8, 18, 0.55) 100%);
}

/* ---------- typography helpers ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h1, h2, h3 { font-weight: 700; letter-spacing: -0.03em; line-height: 1.25; }

.h-display {
  font-family: var(--font-display);
  font-size: clamp(36px, 7.5vw, 68px);
  line-height: 1.12;
}
.h-section {
  font-size: clamp(28px, 5vw, 42px);
  margin: 14px 0 18px;
}
.lead {
  color: var(--text-1);
  font-size: 18px;
  max-width: 720px;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
}

/* ---------- layout ---------- */
.wrap { width: min(var(--w-max), calc(100% - 48px)); margin: 0 auto; }

.section { padding: clamp(72px, 12vw, 120px) 0; position: relative; }
/* 워터마크 돌출로 인한 가로 스크롤바 방지 (본문 클리핑 없이 X축만) */
.section, .sol-block, .cat-block { overflow-x: clip; }
.section-head { margin-bottom: clamp(40px, 5vw, 64px); }
.section-head.center { text-align: center; }
.section-head.center .lead { margin: 0 auto; }
.section-head.center .eyebrow::before { display: none; }

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }


/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.35s ease, border-color 0.35s ease, backdrop-filter 0.35s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(4, 10, 22, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--line);
}
.nav-inner {
  width: min(var(--w-max), calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-0);
  display: inline-flex;
  align-items: center;
}
.logo .logo-d {
  color: var(--blue);
  text-shadow: 0 0 18px rgba(77, 141, 255, 0.5);
}

.menu {
  display: flex;
  align-items: center;
  gap: 6px;
}
.menu a {
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-1);
  transition: color 0.2s, background 0.2s;
}
.menu a:hover { color: var(--text-0); background: var(--surface-hover); }
.menu a.active {
  color: var(--text-0);
  background: var(--surface-hover);
  box-shadow: inset 0 0 0 1px var(--line);
}

.nav-cta { display: flex; align-items: center; gap: 12px; }
/* 우측 CTA 버튼 높이를 좌측 메뉴 링크(padding:9px·14.5px)와 동일하게 축소 */
.nav-cta .btn { padding: 8px 20px; font-size: 14.5px; }

/* 모바일 햄버거 버튼 (데스크탑에서는 숨김) */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: rgba(148, 180, 255, 0.04);
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text-0);
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav.menu-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* keyboard focus */
a:focus-visible, .btn:focus-visible, button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}


/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s;
}
.btn-primary {
  background: var(--grad-main);
  color: #04122e;
  box-shadow: 0 6px 24px rgba(77, 141, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(77, 141, 255, 0.5); }
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--text-0);
  background: rgba(148, 180, 255, 0.03);
}
.btn-ghost:hover { border-color: var(--blue); background: var(--surface-hover); transform: translateY(-2px); }
.btn .arr { font-family: var(--font-mono); transition: transform 0.2s; }
.btn:hover .arr { transform: translateX(3px); }

/* ---------- hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 40px) 0 60px;
  position: relative;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(148, 180, 255, 0.05);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-1);
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.8); }
}
.hero .lead { margin-top: 26px; }
.hero-actions { display: flex; gap: 14px; margin-top: 40px; flex-wrap: wrap; }

.hero-sub {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.4vw, 15px);
  letter-spacing: 0.08em;
  color: var(--text-2);
}

.scroll-hint {
  position: absolute;
  bottom: 34px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.scroll-hint::after {
  content: "";
  width: 1px; height: 42px;
  background: linear-gradient(180deg, var(--cyan), transparent);
  animation: drip 2s ease-in-out infinite;
}
@keyframes drip {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- cards ---------- */
.card {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  border-top-color: rgba(148, 180, 255, 0.2);
  background: linear-gradient(160deg, rgba(148, 180, 255, 0.055), rgba(148, 180, 255, 0.015));
  box-shadow: 0 4px 20px rgba(2, 8, 20, 0.35);
  padding: 32px 30px;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
/* 비인터랙티브 카드(폼·정보)는 hover 변형 없음 */
.card.static:hover { transform: none; border-color: var(--line); border-top-color: rgba(148, 180, 255, 0.2); box-shadow: 0 4px 20px rgba(2, 8, 20, 0.35); }
.card.static::before { display: none; }
.card:hover {
  transform: translateY(-5px);
  border-color: rgba(77, 141, 255, 0.45);
  box-shadow: 0 18px 48px rgba(3, 10, 30, 0.55), 0 0 0 1px rgba(77, 141, 255, 0.12);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px 200px at var(--mx, 50%) var(--my, 0%), rgba(77, 141, 255, 0.13), transparent 65%);
  opacity: 0;
  transition: opacity 0.35s;
  pointer-events: none;
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 50px; height: 50px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, rgba(77, 141, 255, 0.22), rgba(45, 217, 255, 0.1));
  border: 1px solid rgba(77, 141, 255, 0.3);
  margin-bottom: 22px;
}
.material-symbols-outlined {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  font-size: 26px;
  color: var(--cyan);
  user-select: none;
  /* 폰트 로딩 전 리가처 원문 노출(FOUT) 방지 — main.js가 fonts-loaded 부여 */
  opacity: 0;
  transition: opacity 0.2s;
}
html.fonts-loaded .material-symbols-outlined { opacity: 1; }
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--text-1); font-size: 15px; }

/* ---------- chips / tags ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(148, 180, 255, 0.05);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--text-1);
  white-space: nowrap;
}
.chip.hl { color: var(--cyan); border-color: rgba(45, 217, 255, 0.35); }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 6px;
  color: var(--cyan);
  background: rgba(45, 217, 255, 0.08);
  border: 1px solid rgba(45, 217, 255, 0.22);
}
.tag.gold { color: var(--ci-bright); background: rgba(224, 85, 97, 0.08); border-color: rgba(224, 85, 97, 0.28); }

/* ---------- stats ---------- */
.stats-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(6, 15, 31, 0.5);
  backdrop-filter: blur(6px);
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat {
  padding: clamp(28px, 5vw, 44px) 16px;
  text-align: center;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: none; }
.stat .num {
  font-family: var(--font-display);
  font-size: clamp(32px, 5.5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat .num sub, .stat .num sup { font-size: 0.5em; }
.stat .label { margin-top: 6px; color: var(--text-2); font-size: 13.5px; letter-spacing: 0.02em; }


/* ---------- metric inline (in cards) ---------- */
.metric {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}
.metric .v {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}
.metric .k { font-size: 13px; color: var(--text-2); }

/* ---------- timeline ---------- */
.timeline {
  position: relative;
  margin-left: 8px;
  padding-left: 36px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(77, 141, 255, 0.15));
}
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -41px; top: 7px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 12px rgba(45, 217, 255, 0.5);
}
.tl-item .year {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan);
}
.tl-item .desc { color: var(--text-1); font-size: 15px; margin-top: 4px; }
.tl-item .desc b { color: var(--text-0); font-weight: 600; }

/* ---------- marquee (client wall) ---------- */
.marquee {
  overflow: hidden;
  position: relative;
  padding: 10px 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 42s linear infinite;
}
.marquee-track .client-pill { margin-right: 18px; }
.marquee.reverse .marquee-track { animation-direction: reverse; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.client-pill {
  padding: 13px 28px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(148, 180, 255, 0.04);
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  background: rgba(4, 10, 22, 0.85);
  padding: 64px 0 36px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}
.footer .slogan { color: var(--text-1); margin-top: 14px; font-size: 14.5px; max-width: 330px; }
.footer h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 18px;
}
.footer li { margin-bottom: 10px; font-size: 14.5px; color: var(--text-1); }
.footer li a:hover { color: var(--cyan); }
.footer .info li { font-size: 13.5px; line-height: 1.65; color: var(--text-2); }
.footer .info b { color: var(--text-1); font-weight: 500; }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--text-2);
  font-size: 13px;
}

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  border-radius: 24px;
  border: 1px solid rgba(77, 141, 255, 0.3);
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(31, 94, 255, 0.25), transparent 60%),
    radial-gradient(500px 260px at 85% 100%, rgba(45, 217, 255, 0.14), transparent 60%),
    linear-gradient(160deg, rgba(10, 24, 48, 0.9), rgba(6, 15, 31, 0.9));
  padding: clamp(40px, 7vw, 72px) clamp(22px, 5vw, 72px);
  text-align: center;
  overflow: hidden;
}
.cta-band h2 { font-size: clamp(26px, 5vw, 38px); }
.cta-band p { color: var(--text-1); margin: 16px auto 34px; max-width: 560px; }

/* ---------- reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.6, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.6, 0.2, 1);
}
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.12s; }
.reveal[data-delay="2"] { transition-delay: 0.24s; }
.reveal[data-delay="3"] { transition-delay: 0.36s; }
.reveal[data-delay="4"] { transition-delay: 0.48s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .marquee-track { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- section divider watermark ---------- */
.watermark {
  position: absolute;
  top: 40px; right: 0;
  font-family: var(--font-display);
  font-size: clamp(72px, 16vw, 160px);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(148, 180, 255, 0.07);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

/* ---------- misc ---------- */
.divider-glow {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(77, 141, 255, 0.5), transparent);
  border: none;
}

/* dark autofill (Chrome) */
input:-webkit-autofill, textarea:-webkit-autofill {
  -webkit-box-shadow: 0 0 0 1000px #081020 inset;
  -webkit-text-fill-color: var(--text-0);
}

.kbd-list { margin-top: 20px; }
.kbd-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 9px 0;
  color: var(--text-1);
  font-size: 14.5px;
  border-bottom: 1px dashed rgba(148, 180, 255, 0.08);
}
.kbd-list li:last-child { border-bottom: none; }
.kbd-list li::before {
  content: "▸";
  color: var(--cyan);
  font-size: 12px;
  margin-top: 3px;
  flex-shrink: 0;
}

/* ============================================================
   Responsive — 태블릿·모바일
   ============================================================ */

@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  /* 나브: 메뉴를 햄버거 드롭다운으로 전환 */
  .nav-toggle { display: inline-flex; }
  .menu {
    display: none;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px 24px 22px;
    background: rgba(4, 10, 22, 0.96);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    max-height: calc(100svh - var(--nav-h));
    overflow-y: auto;
  }
  .nav.menu-open .menu { display: flex; }
  .menu a { padding: 13px 16px; border-radius: 12px; font-size: 16px; }

  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  /* 통계 밴드: 4열 → 2×2 */
  .stats-row { grid-template-columns: 1fr 1fr; }
  .stat { border-left: none; }
  .stat:nth-child(even) { border-left: 1px solid var(--line); }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }

  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
  .timeline { margin-left: 4px; padding-left: 28px; }
  .tl-item::before { left: -33px; }
  .card { padding: 26px 22px; }
  .scroll-hint { display: none; }
}

@media (max-width: 420px) {
  /* 초소형 화면: 나브 CTA 버튼 축소 */
  .nav-cta .btn { padding: 8px 14px; font-size: 13.5px; }
  .wrap { width: calc(100% - 36px); }
  .nav-inner { width: calc(100% - 36px); }
}