/* =========================================================
   K-DFS 2026 — style.css
   하이브리드 테마: Dark(기본) + Light(발표자·일정·경품·전시)
   - 섹션에 .theme-dark / .theme-light 를 붙이면 아래 의미 토큰
     (--bg, --surface, --text, --line ...)이 해당 테마 값으로 바뀝니다.
   - 3부 컬러: [data-part] → --part(선·포인트), --part-ink(글자용)
   ========================================================= */

/* ---------- 1. Palette (컬러 가이드) ---------- */
:root {
  --navy-950: #06111f;
  --navy-900: #0a182b;   /* Dark Navy */
  --navy-850: #0d1e34;
  --navy-800: #112842;   /* Secondary Navy */
  --navy-700: #163352;
  --navy-600: #1c3e63;

  --blue: #2589d0;       /* Primary Blue */
  --blue-strong: #1c76b8;/* 흰 글자 대비 확보용 (버튼 배경) */
  --blue-deep: #1a6ca8;
  --cyan: #55c9f6;       /* Cyan Accent */

  --light-bg: #f5f7fa;   /* Light Background */
  --white: #ffffff;      /* White Surface */
  --ink: #142a43;        /* Primary Text on Light */
  --ink-2: #526477;      /* Secondary Text on Light */
  --ink-3: #5f7084;
  --light-line: #e1e7ef;
  --light-line-strong: #cdd6e1;

  --font: 'NanumSquareNeo', 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --mono: ui-monospace, 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --radius: 14px;
  --radius-lg: 22px;
  --container: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 72px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --tri: linear-gradient(90deg, var(--p-evidence), var(--p-investigation), var(--p-trust));
}

/* ---------- 2. Theme tokens ---------- */
:root, .theme-dark {
  --bg: var(--navy-900);
  --surface: #132d4b;
  --surface-2: #18375a;
  --line: rgba(120, 170, 225, .16);
  --line-strong: rgba(120, 170, 225, .30);
  --text: #eef4fb;
  --text-2: #b5c4d6;
  --text-3: #8a9db4;
  --link: var(--cyan);
  --shadow-card: none;
  --shadow-hover: 0 24px 50px -24px rgba(0, 0, 0, .65);

  --p-evidence: #4ba3e8;
  --p-investigation: var(--cyan);
  --p-trust: #a78bfa;
  --p-evidence-ink: var(--p-evidence);
  --p-investigation-ink: var(--p-investigation);
  --p-trust-ink: var(--p-trust);
}

.theme-light {
  --bg: var(--light-bg);
  --surface: var(--white);
  --surface-2: #f8fafc;
  --line: var(--light-line);
  --line-strong: var(--light-line-strong);
  --text: var(--ink);
  --text-2: var(--ink-2);
  --text-3: var(--ink-3);
  --link: var(--blue-strong);
  --shadow-card: 0 1px 2px rgba(20, 42, 67, .04), 0 8px 24px -12px rgba(20, 42, 67, .12);
  --shadow-hover: 0 2px 4px rgba(20, 42, 67, .05), 0 22px 44px -20px rgba(20, 42, 67, .24);

  --p-evidence: var(--blue);
  --p-investigation: #1fa9dc;
  --p-trust: #8b6ce8;
  --p-evidence-ink: var(--blue-deep);
  --p-investigation-ink: #0a7397;
  --p-trust-ink: #6a4bc9;

  color: var(--text);
}
.theme-dark { color: var(--text); }

[data-part="evidence"]      { --part: var(--p-evidence);      --part-ink: var(--p-evidence-ink); }
[data-part="investigation"] { --part: var(--p-investigation); --part-ink: var(--p-investigation-ink); }
[data-part="trust"]         { --part: var(--p-trust);         --part-ink: var(--p-trust-ink); }

/* ---------- 3. Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 8px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--navy-900);
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
address { font-style: normal; }
[hidden] { display: none !important; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
.theme-light :focus-visible { outline-color: var(--blue-strong); }

.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 200;
  padding: 10px 16px; border-radius: 8px; background: var(--blue-strong); color: #fff; font-weight: 700; text-decoration: none;
}
.skip-link:focus { top: 12px; }

.container { width: 100%; max-width: calc(var(--container) + var(--gutter) * 2); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 20px;
  border: 1px solid transparent; border-radius: 999px;
  font-weight: 800; font-size: 15px; line-height: 1.2; text-decoration: none; white-space: nowrap;
  cursor: pointer;
  transition: transform .2s var(--ease), background-color .2s, border-color .2s, box-shadow .2s, color .2s;
}
.btn-sm { min-height: 40px; padding: 8px 18px; font-size: 14px; }
.btn-lg { min-height: 54px; padding: 14px 28px; font-size: 16px; }
.btn-xl { min-height: 60px; padding: 16px 36px; font-size: 17px; }

.btn-primary { background: var(--blue-strong); color: #fff; box-shadow: 0 10px 30px -12px rgba(37, 137, 208, .9); }
.btn-primary:hover { background: var(--blue-deep); transform: translateY(-1px); box-shadow: 0 14px 34px -12px rgba(37, 137, 208, 1); }

.btn-accent { background: var(--cyan); color: var(--navy-900); box-shadow: 0 0 0 1px rgba(85, 201, 246, .4), 0 14px 40px -12px rgba(85, 201, 246, .75); }
.btn-accent:hover { background: #7ad6f9; transform: translateY(-2px); }

.btn-ghost { border-color: var(--line-strong); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--text-3); background: color-mix(in srgb, var(--text) 6%, transparent); }

.btn.is-disabled { background: var(--surface-2); color: var(--text-3); box-shadow: none; cursor: default; transform: none; }

/* ---------- 5. Header (항상 다크) ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 100; height: var(--header-h);
  color: #eef4fb;
  transition: background-color .3s, border-color .3s, box-shadow .3s;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(10, 24, 43, .86);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(120, 170, 225, .16);
  box-shadow: 0 10px 30px -20px rgba(0, 0, 0, .6);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; gap: 24px; }
.header-actions { display: none; align-items: center; gap: 10px; margin-left: auto; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-icon { width: 36px; height: 36px; filter: invert(1); }
.brand-text { font-size: 10px; font-weight: 800; line-height: 1.25; letter-spacing: .04em; color: #fff; }
.brand-text b { color: var(--cyan); }

.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav ul { display: flex; gap: 4px; }
.site-nav ul a {
  display: block; padding: 8px 12px; border-radius: 8px;
  font-size: 15px; font-weight: 700; color: #b5c4d6; text-decoration: none;
  transition: color .2s, background-color .2s;
}
.site-nav ul a:hover { color: #fff; background: rgba(255, 255, 255, .06); }
.site-nav ul a[aria-current="true"] { color: #fff; }
.site-nav ul a[aria-current="true"]::after {
  content: ''; display: block; height: 2px; margin-top: 4px; border-radius: 2px; background: var(--tri);
}

.menu-toggle {
  display: none; position: relative; width: 44px; height: 44px;
  border: 1px solid rgba(120, 170, 225, .3); border-radius: 10px; background: transparent; cursor: pointer;
}
.menu-toggle-bar, .menu-toggle-bar::before, .menu-toggle-bar::after {
  position: absolute; left: 12px; width: 18px; height: 2px; border-radius: 2px; background: #fff;
  transition: transform .25s var(--ease), opacity .2s;
}
.menu-toggle-bar { top: 21px; }
.menu-toggle-bar::before, .menu-toggle-bar::after { content: ''; left: 0; }
.menu-toggle-bar::before { transform: translateY(-6px); }
.menu-toggle-bar::after { transform: translateY(6px); }
.nav-open .menu-toggle-bar { background: transparent; }
.nav-open .menu-toggle-bar::before { transform: rotate(45deg); background: #fff; }
.nav-open .menu-toggle-bar::after { transform: rotate(-45deg); background: #fff; }

/* ---------- 6. Hero (Dark) ---------- */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  min-height: 100svh; display: flex; align-items: center;
  padding: calc(var(--header-h) + 48px) 0 72px;
  background: var(--navy-900);
}
.hero-bg { position: absolute; inset: 0; z-index: -3; }
/* 지문 이미지: 존재감을 소폭 높임 (오버레이와 분리해 필터가 네이비 톤에 영향 주지 않도록) */
.hero-bg::before {
  content: ''; position: absolute; inset: 0;
  background: url('../assets/images/hero-bg.jpg') center right / cover no-repeat;
  filter: brightness(1.16) contrast(1.06);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background:
    linear-gradient(to bottom, transparent 60%, var(--navy-900) 100%),
    radial-gradient(ellipse 34% 40% at 56% 50%, rgba(85, 201, 246, .08), transparent 70%),
    radial-gradient(ellipse 60% 55% at 78% 45%, rgba(37, 137, 208, .2), transparent 70%),
    linear-gradient(90deg, var(--navy-900) 0%, rgba(10, 24, 43, .9) 36%, rgba(10, 24, 43, .42) 68%, rgba(10, 24, 43, .5) 100%);
}
.hero-grid {
  position: absolute; inset: 0; z-index: -2; opacity: .45;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  /* 텍스트(왼쪽) 영역은 비우고 오른쪽 그래픽 쪽에만 노출 */
  -webkit-mask-image: radial-gradient(ellipse 55% 70% at 78% 45%, #000 20%, transparent 75%);
          mask-image: radial-gradient(ellipse 55% 70% at 78% 45%, #000 20%, transparent 75%);
}

.hero-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(24px, 3.5vw, 56px); align-items: center; }

.eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 28px; font-size: 15px; font-weight: 700; color: var(--text-2); }
.eyebrow-tag {
  font-family: var(--mono); font-size: 13px; letter-spacing: .08em; color: #fff;
  padding: 6px 12px; border-radius: 6px; background: rgba(37, 137, 208, .22); border: 1px solid rgba(37, 137, 208, .6);
}

.hero-title {
  /* 4줄 고정: 각 줄은 줄바꿈 없이, 칼럼 폭에 맞춰 글자 크기만 조정 */
  font-size: clamp(36px, 5.3vw, 73px); font-weight: 900; line-height: 1.14; letter-spacing: -.035em;
  margin-bottom: 32px; text-shadow: 0 2px 24px rgba(10, 24, 43, .6);
}
.hero-title .t-line { display: block; white-space: nowrap; }
.hero-title em {
  font-style: normal; text-shadow: none;
  background: linear-gradient(100deg, var(--p-evidence) 0%, var(--cyan) 55%, var(--p-trust) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.hero-parts { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.part-chip {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 16px 9px 12px; border-radius: 999px;
  font-size: 15px; font-weight: 800;
  background: color-mix(in srgb, var(--part) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--part) 45%, transparent);
}
.part-chip::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--part);
  box-shadow: 0 0 10px var(--part);
}

.hero-meta { display: grid; gap: 10px; margin-bottom: 40px; }
.hero-meta div { display: flex; gap: 16px; align-items: baseline; }
.hero-meta dt {
  flex: none; width: 44px; font-family: var(--mono); font-size: 12px; font-weight: 700;
  letter-spacing: .06em; color: var(--text-3);
}
.hero-meta dd { font-size: 17px; font-weight: 700; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Hero key visual: Evidence → Investigation → Trust ---------- */
.kv {
  /* 데스크톱: 칼럼보다 살짝 크게(양옆 24px), 칼럼 가운데 정렬 */
  position: relative; width: min(calc(100% + 48px), 660px); justify-self: center; aspect-ratio: 1;
  transform: translate3d(0, var(--kv-scroll, 0px), 0);
}
.kv svg { display: block; width: 100%; height: 100%; overflow: visible; }

.kv-orbits circle { fill: none; stroke: rgba(120, 170, 225, .10); stroke-width: 1; }
.kv-orbits .kv-orbit-inner { stroke: rgba(120, 170, 225, .07); }
.kv-link { fill: none; stroke: rgba(75, 163, 232, .22); stroke-width: 1; }

/* 01 증거 레이어 */
.kv-plane path:first-child { fill: url(#kvPlane); stroke: rgba(75, 163, 232, .55); stroke-width: 1.2; stroke-linejoin: round; }
.kv-p2 path { stroke: rgba(75, 163, 232, .38) !important; opacity: .85; }
.kv-p3 path { stroke: rgba(75, 163, 232, .24) !important; opacity: .7; }
.kv-hatch { fill: none !important; stroke: rgba(75, 163, 232, .28) !important; stroke-width: 1 !important; }
.kv-frag { fill: #8fc8f5; animation: kv-twinkle 6s ease-in-out infinite alternate; }
.kv-plane { animation: kv-float 7s ease-in-out infinite alternate; }
.kv-p2 { animation-delay: -2.3s; }
.kv-p3 { animation-delay: -4.6s; }

/* 흐름선 + 빛의 이동 */
.kv-flow { fill: none; stroke: url(#kvFlow); stroke-width: 1.2; opacity: .5; }
/* 빛 구슬(SVG animateMotion) — 위치·투명도는 SVG 안에서 애니메이션 */
.kv-orb { pointer-events: none; }

/* 02 조사 네트워크 */
.kv-edge {
  stroke: rgba(85, 201, 246, .5); stroke-width: 1.1;
  stroke-dasharray: 1; stroke-dashoffset: 1;
  animation: kv-draw 1.4s var(--ease) forwards; animation-delay: calc(var(--i) * .12s + .3s);
}
.kv-node {
  fill: #0a182b; stroke: var(--cyan); stroke-width: 1.6; opacity: 0;
  animation: kv-in .8s var(--ease) var(--d, 1.5s) forwards;
}
.kv-hub { fill: var(--cyan); stroke: #c9eefd; }
.kv-hub-ring { fill: none; stroke: rgba(85, 201, 246, .35); stroke-width: 1; transform-box: fill-box; transform-origin: center; animation: kv-breathe 5s ease-in-out infinite; }

/* 03 신뢰의 인장 */
.kv-ring, .kv-ridge { fill: none; }
.kv-ring-outer { stroke: rgba(167, 139, 250, .22); stroke-width: 1; animation: kv-glow 7s ease-in-out infinite; }
.kv-ring-main { stroke: rgba(167, 139, 250, .6); stroke-width: 1.4; stroke-dasharray: 64 6 20 10; }
.kv-ridge { stroke: rgba(205, 190, 255, .62); stroke-width: 1.6; stroke-linecap: round; }
/* 인장은 회전하지 않고, 결이 은은하게 숨 쉬듯 밝아졌다 어두워짐 */
.kv-ridges { animation: kv-glow 7s ease-in-out infinite; animation-delay: -3.5s; }
.kv-core { transform-box: fill-box; transform-origin: center; animation: kv-breathe 7s ease-in-out infinite; }

/* 라벨: 짧고 절제된 표기 */
.kv-labels text { font-family: var(--font); }
.kv-ko { font-size: 15px; font-weight: 800; fill: #eef4fb; }

@keyframes kv-float   { from { transform: translateY(0); } to { transform: translateY(-7px); } }
@keyframes kv-twinkle { from { opacity: 1; } to { opacity: .45; } }
@keyframes kv-draw    { to { stroke-dashoffset: 0; } }
@keyframes kv-in      { to { opacity: 1; } }
@keyframes kv-breathe { 0%, 100% { transform: scale(1); opacity: .9; } 50% { transform: scale(1.12); opacity: 1; } }
@keyframes kv-glow    { 0%, 100% { opacity: .7; } 50% { opacity: 1; } }

/* ---------- 7. Countdown (Dark) ---------- */
.countdown-band {
  position: relative;
  background: linear-gradient(90deg, var(--navy-800), #15406b 50%, var(--navy-800));
  border-block: 1px solid rgba(37, 137, 208, .4);
}
.countdown-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 28px; }
.countdown-label { font-size: 17px; font-weight: 800; }
.countdown { display: flex; gap: clamp(10px, 2vw, 20px); }
.cd-unit { display: flex; align-items: baseline; gap: 6px; }
.cd-num {
  min-width: 2ch; font-family: var(--mono); font-size: clamp(30px, 4vw, 44px); font-weight: 700; line-height: 1;
  font-variant-numeric: tabular-nums; text-align: right;
}
.cd-txt { font-size: 14px; font-weight: 700; color: var(--text-2); }
.countdown-done { font-size: 18px; font-weight: 800; }

/* ---------- 8. Sections (shared) ---------- */
.section { padding: clamp(80px, 11vw, 140px) 0; position: relative; }
.section-head { max-width: 760px; margin-bottom: clamp(40px, 5vw, 64px); }
.section-title { font-size: clamp(30px, 4vw, 46px); font-weight: 900; line-height: 1.25; letter-spacing: -.03em; color: var(--text); }
.section-desc { margin-top: 14px; font-size: 17px; line-height: 1.75; color: var(--text-2); }
.section-desc strong { color: var(--text); font-weight: 800; }

.noscript { padding: 24px; border: 1px dashed var(--line-strong); border-radius: var(--radius); color: var(--text-2); }

/* reveal */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* 라이트 → 다크 경계(참가 등록 상단): 3부 컬러 헤어라인 */
.register::before {
  content: ''; position: absolute; inset: 0 0 auto; height: 2px; background: var(--tri); opacity: .8;
}

/* ---------- 9. About + 3부 구성 (Dark, Hero 보다 한 단계 밝게) ---------- */
.about {
  overflow: hidden;
  background: linear-gradient(180deg, var(--navy-850) 0%, var(--navy-850) 45%, var(--navy-800) 100%);
  padding-bottom: clamp(96px, 12vw, 160px);
}
.about::after {
  /* 다크 → 라이트 전환 직전 하단의 절제된 그라데이션 */
  content: ''; position: absolute; inset: auto 0 0; height: 120px; pointer-events: none;
  background: linear-gradient(to bottom, transparent, rgba(85, 201, 246, .05));
}
.about-copy { max-width: 720px; margin-bottom: clamp(48px, 6vw, 72px); }
.about-copy .section-title { margin-bottom: 28px; }
.about-copy .lead { font-size: clamp(19px, 2vw, 22px); font-weight: 700; line-height: 1.7; color: var(--text); margin-bottom: 20px; }
.about-copy p { color: var(--text-2); font-size: 17px; line-height: 1.85; }
.about-copy p + p { margin-top: 14px; }
.about-copy strong { color: var(--text); font-weight: 800; }

.part-grid { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
/* 세 카드를 잇는 스토리 라인 */
.part-grid::before {
  content: ''; position: absolute; left: 32px; right: 32px; top: 60px; height: 1px; z-index: 0;
  background: var(--tri); opacity: .35;
}
.part-card {
  position: relative; z-index: 1; overflow: hidden; display: flex; flex-direction: column;
  padding: 32px 30px 30px; border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 70% at 100% 0%, color-mix(in srgb, var(--part) 20%, transparent), transparent 60%),
    var(--surface);
  border: 1px solid var(--line);
  box-shadow: 0 0 0 0 transparent;
  transition: border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.part-card::before { content: ''; position: absolute; inset: 0 0 auto; height: 3px; background: var(--part); }
.part-card:hover {
  border-color: color-mix(in srgb, var(--part) 55%, transparent); transform: translateY(-4px);
  box-shadow: 0 24px 60px -28px color-mix(in srgb, var(--part) 70%, transparent);
}
.part-no {
  font-family: var(--mono); font-size: 72px; font-weight: 700; line-height: 1; letter-spacing: -.04em;
  color: transparent; -webkit-text-stroke: 1.5px var(--part);
  margin-bottom: 22px;
}
.part-name { font-size: 26px; font-weight: 900; letter-spacing: -.02em; margin-bottom: 8px; }
.part-lead { color: var(--text-2); font-size: 16px; font-weight: 700; line-height: 1.6; }

/* ---------- 11. Speakers (Light) ---------- */
.speakers {
  /* 다크 섹션에서 내려올 때 부드럽게 밝아지도록 */
  background: linear-gradient(180deg, #e8eef5 0, #f5f7fa 180px, var(--white) 520px);
  padding-top: clamp(96px, 12vw, 150px);
  /* 다크 섹션이 위에 얹힌 듯한 깊이감 */
  box-shadow: inset 0 28px 48px -32px rgba(10, 24, 43, .45);
}
.speakers::before {
  content: ''; position: absolute; inset: 0 0 auto; height: 2px; background: var(--tri); opacity: .8;
}
.speaker-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 24px; }
.speaker-card {
  display: flex; flex-direction: column; overflow: hidden;
  border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: border-color .3s, transform .3s var(--ease), box-shadow .3s;
}
.speaker-card:hover { border-color: var(--line-strong); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
/* 사진은 얼굴이 잘리지 않도록 위쪽 기준으로 자름 */
.speaker-card > .avatar { width: 100%; aspect-ratio: 1 / .82; object-fit: cover; object-position: center 20%; }

.avatar-initial {
  position: relative; display: grid; place-items: center; overflow: hidden;
  background:
    repeating-radial-gradient(circle at 50% 120%, transparent 0 10px, color-mix(in srgb, var(--part) 22%, transparent) 10px 11px),
    radial-gradient(circle at 50% 100%, color-mix(in srgb, var(--part) 35%, transparent), transparent 70%),
    var(--surface-2);
}
.avatar-initial span { font-size: 64px; font-weight: 900; color: #fff; text-shadow: 0 0 30px var(--part); }
/* 라이트 테마: 글로우 대신 절제된 톤 */
.theme-light .avatar-initial {
  background:
    repeating-radial-gradient(circle at 50% 120%, transparent 0 10px, color-mix(in srgb, var(--part) 12%, transparent) 10px 11px),
    linear-gradient(180deg, color-mix(in srgb, var(--part) 6%, #f8fafc), color-mix(in srgb, var(--part) 14%, #f8fafc));
}
.theme-light .avatar-initial span { color: var(--part-ink); text-shadow: none; }
.speaker-card.is-tba .avatar-initial span { color: var(--text-3); text-shadow: none; }

.speaker-body { display: flex; flex-direction: column; gap: 6px; padding: 22px 22px 24px; flex: 1; border-top: 1px solid var(--line); }
.badge {
  align-self: flex-start; padding: 3px 10px; border-radius: 999px; margin-bottom: 6px;
  font-size: 12px; font-weight: 800; color: var(--part-ink);
  background: color-mix(in srgb, var(--part) 12%, transparent);
}
.speaker-name { font-size: 22px; font-weight: 900; color: var(--text); }
.speaker-name small { font-size: 15px; font-weight: 700; color: var(--text-2); }
.speaker-org { color: var(--text-2); font-weight: 700; font-size: 15px; }
.speaker-topic {
  margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line);
  font-size: 14px; font-weight: 700; line-height: 1.6; color: var(--text);
}

/* 기조연설자: 가로형 대형 카드 */
.speaker-card.is-keynote { grid-column: span 2; flex-direction: row; border-color: color-mix(in srgb, var(--part) 35%, var(--line)); }
.speaker-card.is-keynote > .avatar { width: 46%; aspect-ratio: auto; min-height: 280px; }
.speaker-card.is-keynote .speaker-body { border-top: 0; border-left: 1px solid var(--line); padding: 28px; }
.speaker-card.is-keynote .speaker-name { font-size: 28px; }
.speaker-card.is-keynote .speaker-topic { font-size: 16px; }
.keynote-label {
  align-self: flex-start; font-family: var(--mono); font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: #fff; background: var(--navy-800); padding: 4px 10px; border-radius: 6px; margin-bottom: 4px;
}

/* ---------- 12. Schedule (Light) ---------- */
.schedule { background: var(--light-bg); border-top: 1px solid var(--line); }
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 36px;
}
.filter-btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 8px 18px;
  border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface); cursor: pointer;
  font-weight: 800; font-size: 15px; color: var(--text-2);
  transition: background-color .2s, color .2s, border-color .2s, box-shadow .2s;
}
.filter-btn:hover { color: var(--text); border-color: var(--text-3); }
.filter-btn[aria-pressed="true"] {
  color: #fff; background: var(--part-ink, var(--ink)); border-color: var(--part-ink, var(--ink));
  box-shadow: 0 6px 16px -8px color-mix(in srgb, var(--part-ink, var(--ink)) 80%, transparent);
}
.filter-no { font-family: var(--mono); font-size: 12px; opacity: .75; }

.timeline { display: grid; gap: 12px; }
.tl-part {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 36px; padding: 0 0 12px; border-bottom: 2px solid var(--part);
}
.timeline > li:first-child { margin-top: 0; }
.tl-part-no {
  font-family: var(--mono); font-weight: 700; font-size: 13px; color: #fff;
  background: var(--part-ink); padding: 2px 8px; border-radius: 6px;
}
.tl-part-name { font-size: 24px; font-weight: 900; color: var(--text); }

.tl-item { display: grid; grid-template-columns: 140px 1fr; gap: 24px; align-items: start; }
.tl-time {
  padding-top: 24px; font-family: var(--mono); font-size: 14px; font-weight: 700;
  color: var(--text-2); font-variant-numeric: tabular-nums; white-space: nowrap;
}
.tl-session .tl-body {
  position: relative; padding: 24px 28px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--part);
  box-shadow: var(--shadow-card);
  transition: box-shadow .25s, transform .25s var(--ease);
}
.tl-session .tl-body:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.tl-title { font-size: 20px; font-weight: 900; line-height: 1.5; letter-spacing: -.015em; color: var(--text); }
.tl-sub { margin-top: 6px; color: var(--text-2); font-size: 15px; line-height: 1.65; }
.tl-sub::before { content: '— '; color: var(--part); }
.tl-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px;
  margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line);
}
.tl-speaker { display: flex; align-items: center; gap: 12px; font-size: 14px; line-height: 1.45; color: var(--text-2); }
.tl-speaker strong { color: var(--text); font-weight: 800; }
.tl-speaker .avatar { flex: none; width: 40px; height: 40px; border-radius: 50%; object-fit: cover; object-position: center 20%; }
.tl-speaker .avatar-initial span { font-size: 17px; }
.tl-slides {
  margin-left: auto; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line-strong);
  font-size: 13px; font-weight: 800; text-decoration: none; color: var(--text);
}
.tl-slides:hover { border-color: var(--part); color: var(--part-ink); }

.tl-break .tl-time { padding-top: 14px; color: var(--text-3); }
.tl-break .tl-body {
  display: flex; align-items: center; gap: 12px; padding: 12px 20px;
  border-radius: var(--radius); border: 1px dashed var(--line-strong); color: var(--text-2);
  background: color-mix(in srgb, var(--surface) 50%, transparent);
}
.tl-break .tl-title { font-size: 15px; font-weight: 700; color: var(--text-2); }
.tl-note { margin-left: 6px; font-size: 13px; font-weight: 800; color: var(--link); }
.tl-icon svg { width: 20px; height: 20px; fill: none; stroke: var(--text-3); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- 13. Gift (Light) ---------- */
.gift { background: var(--light-bg); padding-top: 0; }
.gift-box {
  display: grid; grid-template-columns: 1fr; gap: 32px;
  padding: clamp(28px, 5vw, 56px); border-radius: var(--radius-lg);
  background:
    radial-gradient(70% 140% at 100% 50%, color-mix(in srgb, var(--p-trust) 10%, transparent), transparent 60%),
    linear-gradient(120deg, var(--surface), #f3f7fc);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}
.gift-copy .section-title { margin-bottom: 14px; }
.gift-copy p { color: var(--text-2); font-size: 17px; }
.gift-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.gift-item {
  display: flex; flex-direction: column; gap: 6px;
  padding: 20px 18px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--p-trust);
  box-shadow: var(--shadow-card);
  font-size: 14px; color: var(--text-2);
}
.gift-media {
  position: relative; display: grid; place-items: center; aspect-ratio: 1;
  margin: -20px -18px 10px; padding: 18px;
  background: #fff; border-bottom: 1px solid var(--line);
  border-radius: var(--radius) var(--radius) 0 0;
}
.gift-media img { width: 100%; height: 100%; object-fit: contain; transition: transform .35s var(--ease); }
.gift-item:hover .gift-media img { transform: scale(1.04); }
.gift-media svg { display: none; }
.gift-media.is-empty {
  background:
    radial-gradient(circle at 50% 55%, color-mix(in srgb, var(--p-trust) 10%, transparent), transparent 65%),
    #fafbfd;
}
.gift-media.is-empty svg {
  display: block; width: 34%; height: auto; fill: none;
  stroke: color-mix(in srgb, var(--p-trust) 55%, var(--ink-3)); stroke-width: 1.2; stroke-linecap: round; stroke-linejoin: round;
}
.gift-item { overflow: hidden; }
.gift-name { font-size: 16px; font-weight: 800; line-height: 1.45; color: var(--text); min-height: 2.9em; }
.gift-count { color: var(--text-2); font-weight: 700; }
.gift-count strong { font-family: var(--mono); font-size: 30px; line-height: 1; margin-right: 2px; color: var(--p-trust-ink); }
.gift-split { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.gift-split span {
  padding: 2px 8px; border-radius: 6px; font-size: 12px; font-weight: 800;
  color: var(--text-2); background: var(--light-bg); border: 1px solid var(--line);
}
.gift-item img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 10px; margin-bottom: 12px; background: #fff; }
.gift-item strong { color: var(--text); }
.gift-item.is-tba { width: 220px; }
.gift-q {
  display: grid; place-items: center; width: 64px; height: 64px; margin: 0 auto 12px; border-radius: 50%;
  font-size: 30px; font-weight: 900; color: var(--p-trust-ink);
  border: 1px dashed color-mix(in srgb, var(--p-trust) 60%, transparent);
}

/* ---------- 14. Exhibition & Partners (Light) ---------- */
.exhibitors {
  background: linear-gradient(180deg, var(--white) 0, var(--white) calc(100% - 200px), #eef2f7 100%);
  border-top: 1px solid var(--line);
}
.partner-group + .partner-group { margin-top: 56px; }
.group-title {
  display: flex; align-items: center; gap: 14px; margin-bottom: 20px;
  font-size: 15px; font-weight: 800; color: var(--text-2);
}
.group-title::after { content: ''; flex: 1; height: 1px; background: var(--line); }

/* 공통 로고 박스: 같은 비율·여백·정렬 */
/* 로고 영역 높이는 비율로만 정해지고, 로고 이미지는 그 안에 고정 배치 → 파일 형식과 무관하게 카드 정렬 유지 */
.org-logo, .exh-logo {
  position: relative; display: grid; place-items: center; aspect-ratio: 25 / 10;
  background: var(--white);
}
.org-logo img, .exh-logo img {
  position: absolute; left: 22px; top: 14px; width: calc(100% - 44px); height: calc(100% - 28px);
  object-fit: contain;
}
/* 여백 없는 SVG 로고는 PNG 로고(여백 포함)와 시각적 크기를 맞춤 */
.exh-logo img[src$=".svg"] { left: 22%; top: 25%; width: 56%; height: 50%; }
.exh-wordmark { text-align: center; font-size: 19px; font-weight: 900; letter-spacing: -.01em; color: var(--ink); }

.org-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.org-card {
  position: relative; display: flex; flex-direction: column; overflow: hidden;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-card);
}
.org-role {
  align-self: flex-start; margin: 12px 0 0 12px;
  font-size: 12px; font-weight: 800; color: #fff; background: var(--navy-800);
  padding: 2px 10px; border-radius: 999px;
}
.org-name { padding: 10px 16px 14px; border-top: 1px solid var(--line); font-size: 14px; font-weight: 800; }

.exhibitor-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.exh-card {
  display: flex; flex-direction: column; overflow: hidden;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  transition: border-color .25s, transform .25s var(--ease), box-shadow .25s;
}
.exh-card:hover { border-color: var(--line-strong); transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.exh-logo { border-bottom: 1px solid var(--line); }
.exh-body { padding: 16px 18px 18px; }
.exh-name { font-size: 15px; font-weight: 800; color: var(--text); }
.exh-products { margin-top: 6px; font-size: 13px; line-height: 1.6; color: var(--text-2); }

/* ---------- 15. Registration (Dark) ---------- */
.register {
  overflow: hidden; isolation: isolate;
  background: linear-gradient(180deg, var(--navy-800) 0%, var(--navy-900) 100%);
  padding-block: clamp(96px, 12vw, 150px);
}
.register-glow {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(40% 60% at 15% 30%, rgba(37, 137, 208, .22), transparent 70%),
    radial-gradient(35% 55% at 90% 80%, rgba(85, 201, 246, .12), transparent 70%);
}
.register-glow::after {
  content: ''; position: absolute; inset: 0; opacity: .35;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 50% 70% at 85% 50%, #000 10%, transparent 70%);
          mask-image: radial-gradient(ellipse 50% 70% at 85% 50%, #000 10%, transparent 70%);
}
.register-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(40px, 6vw, 88px); align-items: center; }
.register-title { font-size: clamp(30px, 4.2vw, 50px); font-weight: 900; line-height: 1.3; letter-spacing: -.03em; margin-bottom: 18px; }
.register-sub { font-size: 17px; color: var(--text-2); margin-bottom: 28px; }

.register-card {
  padding: clamp(24px, 3vw, 36px); border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--surface) 75%, transparent);
  border: 1px solid var(--line-strong);
  box-shadow: 0 30px 70px -30px rgba(0, 0, 0, .6), inset 0 1px 0 rgba(255, 255, 255, .05);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.register-facts div { display: grid; grid-template-columns: 84px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.register-facts div:first-child { padding-top: 0; }
.register-facts dt { font-size: 14px; font-weight: 700; color: var(--text-3); }
.register-facts dd { font-weight: 800; }
.register-facts small { display: block; margin-top: 4px; font-size: 14px; font-weight: 600; color: var(--text-2); }
.register-maps { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }

/* ---------- 16. Footer (Dark) ---------- */
.site-footer { background: var(--navy-950); border-top: 1px solid var(--line); padding: 52px 0 28px; font-size: 14px; color: var(--text-2); }
.footer-inner { display: grid; grid-template-columns: auto 1fr auto; gap: 48px; align-items: start; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
.footer-logos { display: flex; align-items: center; gap: 20px; margin-bottom: 10px; }
/* 어두운 푸터: 로고를 모두 흰색 단색으로 */
.footer-logos img { width: 120px; filter: brightness(0) invert(1); }
.footer-logos .footer-logo-plainbit { width: 116px; }
.footer-logos .footer-logo-playdaum { width: 112px; padding-left: 20px; border-left: 1px solid var(--line-strong); box-sizing: content-box; }
.footer-brand p { color: var(--text-2); font-weight: 700; }
.footer-address p { line-height: 1.7; }
.footer-links { display: grid; gap: 6px; text-align: right; }
.footer-links a { text-decoration: none; color: var(--text-2); }
.footer-links a:hover { color: var(--text); text-decoration: underline; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; color: var(--text-3); }
.to-top { text-decoration: none; font-weight: 700; color: var(--text-2); }
.to-top:hover { color: var(--text); }

/* ---------- 17. Responsive ---------- */
@media (max-width: 1100px) {
  .exhibitor-grid, .org-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
  :root { --header-h: 64px; }
  .header-actions { display: flex; }
  .menu-toggle { display: block; }
  .site-nav .js-register { display: none; } /* 헤더에 이미 노출되므로 메뉴 안 중복 버튼은 숨김 */
  .site-nav {
    position: fixed; inset: var(--header-h) 0 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 24px;
    padding: 24px var(--gutter) 40px; overflow-y: auto;
    background: var(--navy-900);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity .25s, transform .25s var(--ease), visibility .25s;
  }
  .nav-open .site-nav { opacity: 1; visibility: visible; transform: none; }
  .nav-open { overflow: hidden; }
  /* backdrop-filter 는 fixed 자식(모바일 메뉴)의 기준을 헤더로 바꾸므로 모바일에선 끕니다 */
  .site-header.is-scrolled { backdrop-filter: none; -webkit-backdrop-filter: none; background: rgba(10, 24, 43, .97); }
  .nav-open .site-header { background: var(--navy-900); border-bottom-color: rgba(120, 170, 225, .16); }
  .site-nav ul { flex-direction: column; gap: 0; }
  .site-nav ul a { padding: 16px 4px; font-size: 18px; border-bottom: 1px solid rgba(120, 170, 225, .16); border-radius: 0; }
  .site-nav ul a[aria-current="true"]::after { display: none; }
  .site-nav ul a[aria-current="true"] { color: var(--cyan); }
  .site-nav .btn { min-height: 54px; font-size: 16px; }

  .hero { min-height: auto; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-title { font-size: clamp(34px, 7.4vw, 64px); }
  .kv { width: 100%; max-width: 600px; margin-top: 8px; }

  .register-inner { grid-template-columns: 1fr; }
  .part-grid { grid-template-columns: 1fr; }
  .part-grid::before { left: 70px; right: auto; top: 32px; bottom: 32px; width: 1px; height: auto; background: linear-gradient(180deg, var(--p-evidence), var(--p-investigation), var(--p-trust)); }
  .part-card { display: grid; grid-template-columns: auto 1fr; column-gap: 28px; }
  .part-card > * { grid-column: 2; }
  .part-card > .part-no { grid-column: 1; grid-row: 1 / span 5; margin-bottom: 0; }

  .speaker-card.is-keynote { grid-column: 1 / -1; }
  .gift-list { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 760px) {
  .exhibitor-grid, .org-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .countdown-inner { flex-direction: column; align-items: flex-start; gap: 12px; padding-block: 22px; }
  .countdown { width: 100%; justify-content: space-between; }

  .tl-item { grid-template-columns: 1fr; gap: 8px; }
  .tl-time, .tl-break .tl-time { padding-top: 0; font-size: 13px; }
  .tl-session .tl-body { padding: 18px 18px 18px 16px; }
  .tl-title { font-size: 17px; }
  .tl-sub { font-size: 14px; }
  .tl-slides { margin-left: 0; }
  .tl-item + .tl-item { margin-top: 10px; }
  .tl-part-name { font-size: 20px; }

  .speaker-card.is-keynote { flex-direction: column; }
  .speaker-card.is-keynote > .avatar { width: 100%; min-height: 0; aspect-ratio: 1 / .7; }
  .speaker-card.is-keynote .speaker-body { border-left: 0; border-top: 1px solid var(--line); }

  .footer-inner { grid-template-columns: 1fr; gap: 20px; }
  .footer-links { text-align: left; }
}

@media (max-width: 560px) {
  body { font-size: 15px; }
  .hero { padding-top: calc(var(--header-h) + 32px); }
  .hero-meta dd { font-size: 15px; }
  .hero-actions .btn, .register-copy .btn { flex: 1 1 100%; width: 100%; }
  .hero-title { font-size: clamp(30px, 9.2vw, 44px); }
  /* 모바일: 크기와 복잡도 축소 */
  .kv { max-width: 400px; margin-top: 0; }
  .kv-minor { display: none; }
  .kv-ko { font-size: 23px; }
  .header-cta { padding: 6px 14px; min-height: 38px; font-size: 13px; }

  .part-grid::before { display: none; }
  .part-card { display: flex; padding: 28px 22px 22px; }
  .part-no { font-size: 56px; margin-bottom: 16px; }
  .part-name { font-size: 24px; }

  .speaker-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .speaker-card > .avatar { aspect-ratio: 1; }
  .avatar-initial span { font-size: 44px; }
  .speaker-body { padding: 14px 14px 16px; }
  .speaker-name { font-size: 18px; }
  .speaker-name small { display: block; font-size: 14px; }
  .speaker-org { font-size: 13px; }
  .speaker-topic { font-size: 13px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

  .filter-btn { padding: 8px 14px; font-size: 14px; }
  .register-facts div { grid-template-columns: 1fr; gap: 4px; }
  .cd-num { font-size: 30px; }
  .gift-item.is-tba { width: 100%; }
  .gift-list { grid-template-columns: 1fr 1fr; gap: 10px; }
  .gift-item { padding: 16px 14px; }
  .gift-media { margin: -16px -14px 8px; padding: 12px; }
  .gift-name { font-size: 14px; }
  .gift-count strong { font-size: 26px; }
  .footer-bottom { flex-direction: column; gap: 10px; align-items: flex-start; }
}

/* ---------- 18. Motion / Print ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .kv-orb { display: none; }
  .kv { transform: none; }
}

@media print {
  .site-header, .hero-grid, .kv, .filter-bar, .countdown-band, .register-glow { display: none !important; }
  body { background: #fff; color: #000; }
}