/* ============================================================
   LOFTBEAR  v1.0
   loftbear.com 과 모든 방(서브도메인)이 함께 쓰는 토큰 · 기본 스타일 · 컴포넌트.

   규칙
   - 색은 이 파일의 토큰에서만 온다. 페이지에서 새 hex 를 만들지 않는다.
   - 모서리는 0. border-radius 는 원형(타원) 요소에만 50%.
   - 테마는 <html data-lb-theme="dark|light">. 기본은 dark(밤).
     prefers-color-scheme 은 따르지 않는다.
   ============================================================ */

/* ---------- 1. 원재료 팔레트 (모드와 무관) ---------- */
:root {
  /* 나무 */
  --wood-950: #0d0906;
  --wood-900: #140e09;
  --wood-850: #1b130c;
  --wood-800: #231910;
  --wood-700: #312318;
  --wood-600: #463424;

  /* 황동 */
  --brass-bright: #e2c07a;
  --brass: #c49b58;
  --brass-deep: #93713f;
  --brass-dark: #6b502b;

  /* 브라운 */
  --brand-brown: #5e3b1f;
  --walnut: #3b2515;

  /* 램프 초록 유리 */
  --lamp-green: #2f4c3c;
  --lamp-green-deep: #1b2e24;
  --lamp-green-bright: #6f9a7e;

  /* 동판화: 잉크 · 해칭 */
  --ink: #2b2013;
  --hatch: #5c4a32;

  /* 빛 */
  --bulb: #fff3d1;
  --glow: #f2c56f;

  /* 밤의 글자 (양피지) */
  --parchment-100: #ede3d0;
  --parchment-300: #bcab8d;
  --parchment-500: #978569;

  /* 낮의 나무 (라임 오크) */
  --oak-50: #efe9de;
  --oak-100: #e4dccf;
  --oak-200: #d7cdbc;
  --oak-300: #bcae97;
  --oak-700: #65543f;
  --oak-800: #4a3a29;
  --oak-900: #22170d;

  /* 판면 종이 */
  --plate-night: #cdbf9f;
  --plate-night-edge: #a89878;
  --plate-day: #f1eadd;
  --plate-day-edge: #cdbfa6;

  /* ---------- 서체 ---------- */
  --font-display: "Nanum Myeongjo", "Noto Serif KR", "AppleMyungjo", "Batang", serif;
  --font-body: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --font-mono: "IBM Plex Mono", "IBM Plex Sans KR", "Consolas", monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: clamp(1.75rem, 3.4vw, 2.625rem);
  --fs-hero: clamp(2.35rem, 5.4vw, 4.25rem);

  /* ---------- 간격 · 틀 ---------- */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;
  --sp-10: 128px;

  --container: 1180px;
  --gutter: clamp(20px, 4vw, 40px);
  --header-h: 68px;

  --radius-round: 50%;
  --hair: 1px;
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
}

/* ---------- 2. 의미 토큰 : 밤 (기본) ---------- */
:root,
:root[data-lb-theme="dark"] {
  color-scheme: dark;
  --bg: var(--wood-900);
  --bg-raised: var(--wood-850);
  --bg-sunken: var(--wood-950);
  --surface: var(--wood-800);
  --line: var(--wood-600);
  --line-strong: var(--brass-dark);
  --text: var(--parchment-100);
  --text-muted: var(--parchment-300);
  --text-faint: var(--parchment-500);
  --accent: var(--brass-bright);
  --accent-strong: var(--brass);
  --on-accent: var(--wood-950);
  --logo: var(--brass-bright);
  --plate: var(--plate-night);
  --plate-edge: var(--plate-night-edge);
  --grain: color-mix(in srgb, var(--wood-700) 38%, transparent);
  --shadow: color-mix(in srgb, var(--wood-950) 85%, transparent);
  --lamp-intensity: 1;
  --bulb-on: 1;
}

/* ---------- 3. 의미 토큰 : 낮 ---------- */
:root[data-lb-theme="light"] {
  color-scheme: light;
  --bg: var(--oak-100);
  --bg-raised: var(--oak-50);
  --bg-sunken: var(--oak-200);
  --surface: var(--oak-50);
  --line: var(--oak-300);
  --line-strong: var(--brass-deep);
  --text: var(--oak-900);
  --text-muted: var(--oak-800);
  --text-faint: var(--oak-700);
  --accent: var(--brand-brown);
  --accent-strong: var(--walnut);
  --on-accent: var(--oak-50);
  --logo: var(--brand-brown);
  --plate: var(--plate-day);
  --plate-edge: var(--plate-day-edge);
  --grain: color-mix(in srgb, var(--oak-300) 26%, transparent);
  --shadow: color-mix(in srgb, var(--walnut) 35%, transparent);
  --lamp-intensity: 0.22;
  --bulb-on: 0.3;
}

/* ---------- 4. 기본 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.5s var(--ease), color 0.5s var(--ease);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }
p { margin: 0; }
h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

::selection { background: var(--brass-dark); color: var(--parchment-100); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.visually-hidden {
  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: var(--sp-4); top: -60px; z-index: 100;
  padding: var(--sp-2) var(--sp-4);
  background: var(--accent); color: var(--on-accent);
  font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: var(--sp-3); }

/* SVG 패턴 정의만 담는 숨은 svg. display:none 을 쓰면 패턴이 깨진다. */
.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

/* ---------- 5. 틀 ---------- */
.page {
  position: relative;
  min-height: 100vh;
  overflow-x: clip;
  background-color: var(--bg);
  background-image:
    repeating-linear-gradient(90deg,
      transparent 0 13px, var(--grain) 13px 14px,
      transparent 14px 29px, var(--grain) 29px 29.5px,
      transparent 29.5px 47px);
  transition: background-color 0.5s var(--ease);
}

.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

.section { padding-block: clamp(80px, 11vw, 136px); position: relative; }

.section-head { max-width: 760px; margin-bottom: clamp(40px, 5vw, 64px); }
.section-title { font-size: var(--fs-2xl); margin-top: var(--sp-4); }
.section-lede { margin-top: var(--sp-4); color: var(--text-muted); font-size: var(--fs-md); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; }

/* ---------- 6. 헤더 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.site-header.is-stuck {
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  border-bottom-color: var(--line-strong);
  box-shadow: 0 10px 30px -22px var(--shadow);
}
.site-header__inner { display: flex; align-items: center; gap: var(--sp-5); height: 100%; }

.brand {
  display: inline-flex; align-items: center;
  color: var(--logo);
  text-decoration: none;
  transition: color 0.5s var(--ease);
}
.brand svg { height: 24px; width: auto; }

.brand-rule {
  width: 1px; height: 28px; flex: none; align-self: center;
  background: linear-gradient(to bottom, transparent, var(--brass) 25%, var(--brass-bright) 50%, var(--brass) 75%, transparent);
}

.nav { display: flex; align-items: center; gap: var(--sp-5); margin-right: auto; }
.nav a {
  position: relative;
  padding: 6px 0;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.nav a:hover { color: var(--text); }
.nav a:hover::after { transform: scaleX(1); }

/* 밤/낮 세그먼트 */
.theme-switch {
  display: inline-flex; flex: none;
  padding: 2px; gap: 2px;
  background: var(--bg-sunken);
  border: 1px solid var(--line-strong);
}
.theme-switch button {
  appearance: none; border: 0; margin: 0; cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 32px; padding: 6px 12px;
  background: transparent;
  color: var(--text-muted);
  font: 600 var(--fs-xs)/1 var(--font-body);
  letter-spacing: 0.04em;
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease);
}
.theme-switch button:hover { color: var(--text); }
.theme-switch button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); }
.theme-switch svg { width: 14px; height: 14px; }

/* ---------- 7. 버튼 · 링크 · 아이콘 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 50px; padding: 14px 24px;
  font: 600 var(--fs-sm)/1 var(--font-body);
  letter-spacing: 0.03em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: filter 0.25s var(--ease), background-color 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn svg { width: 18px; height: 18px; transition: transform 0.3s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

.btn--brass {
  color: var(--wood-950);
  background: linear-gradient(to bottom, var(--brass-bright), var(--brass));
  border-color: var(--brass-dark);
  box-shadow:
    inset 0 1px 0 color-mix(in srgb, var(--bulb) 55%, transparent),
    inset 0 -2px 0 color-mix(in srgb, var(--brass-dark) 45%, transparent),
    0 12px 28px -18px var(--shadow);
}
.btn--brass:hover { filter: brightness(1.07); }

.btn--ghost { color: var(--text); background: transparent; border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.link-more {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding-bottom: 2px;
  transition: border-color 0.25s var(--ease), gap 0.25s var(--ease);
}
.link-more:hover { border-bottom-color: var(--accent); gap: 10px; }

.icon {
  width: 24px; height: 24px;
  fill: none; stroke: currentColor;
  stroke-width: 1.5; stroke-linecap: square; stroke-linejoin: miter;
}

/* ---------- 8. 동판화 판면 ---------- */
.plate {
  position: relative;
  display: block;
  color: var(--ink);
  background: radial-gradient(120% 95% at 50% 42%, var(--plate) 58%, var(--plate-edge) 150%);
  box-shadow:
    0 0 0 1px var(--plate-edge),
    0 0 0 6px var(--bg-sunken),
    0 0 0 7px var(--line-strong),
    0 30px 50px -30px var(--shadow);
}

.engraving {
  display: block; width: 100%; height: auto;
  color: var(--ink);
  fill: none; stroke: currentColor;
  stroke-width: 1.1; stroke-linecap: round; stroke-linejoin: round;
}
.engraving .thin { stroke-width: 0.6; }
.engraving .bold { stroke-width: 1.8; }
.engraving .nos { stroke: none; }
.engraving .solid { fill: currentColor; stroke: none; }
.engraving .paper { fill: var(--plate); }
.engraving .hatch { fill: url(#hatch); }
.engraving .hatch-fine { fill: url(#hatch-fine); }
.engraving .hatch-cross { fill: url(#hatch-cross); }
.engraving .hatch-h { fill: url(#hatch-h); }
.engraving .ticks { stroke-linecap: butt; }
.engraving text {
  fill: currentColor; stroke: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
}
.hatch-stroke { stroke: var(--hatch); fill: none; }

/* ---------- 9. 광고 액자 ---------- */
.frame {
  position: relative;
  display: grid; place-items: center;
  min-height: 120px;
  padding: 34px var(--sp-4) var(--sp-4);
  background:
    linear-gradient(var(--brass), var(--brass)) top left / 14px 2px no-repeat,
    linear-gradient(var(--brass), var(--brass)) top left / 2px 14px no-repeat,
    linear-gradient(var(--brass), var(--brass)) top right / 14px 2px no-repeat,
    linear-gradient(var(--brass), var(--brass)) top right / 2px 14px no-repeat,
    linear-gradient(var(--brass), var(--brass)) bottom left / 14px 2px no-repeat,
    linear-gradient(var(--brass), var(--brass)) bottom left / 2px 14px no-repeat,
    linear-gradient(var(--brass), var(--brass)) bottom right / 14px 2px no-repeat,
    linear-gradient(var(--brass), var(--brass)) bottom right / 2px 14px no-repeat,
    var(--bg-sunken);
  border: 1px solid var(--line);
  outline: 1px solid var(--line-strong);
  outline-offset: 5px;
  margin: 6px;
}
.frame__label {
  position: absolute; top: 10px; left: 14px;
  font: 500 10px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.frame__slot { width: 100%; min-height: 60px; display: grid; place-items: center; }
.frame__slot:empty::after {
  content: "광고 액자";
  font: 500 var(--fs-xs)/1 var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--text-faint);
}
.frame--square {
  aspect-ratio: 1 / 1;
  width: 336px;
  max-width: calc(100% - 12px);
  min-height: 0;
  margin-inline: auto;
}

/* ---------- 10. 뱅커스 램프 ---------- */
/* .page 의 첫 자식. 빛은 네 겹: halo(번짐) · beam(빛기둥) · pool(빛웅덩이) · bulb(전구) */
.lamp-rig {
  position: absolute;
  top: var(--lamp-top, 96px);
  right: var(--lamp-right, 24px);
  width: var(--lamp-w, 220px);
  height: calc(var(--lamp-w, 220px) * 0.8636);
  z-index: 5;
  pointer-events: none;
}
.lamp-rig > * { position: absolute; }
.lamp-rig .lamp { inset: 0; width: 100%; height: 100%; z-index: 3; }

.lamp-halo {
  left: 43.6%; top: 36%;
  width: calc(var(--lamp-w, 220px) * 2.7);
  aspect-ratio: 1;
  translate: -50% -50%;
  border-radius: var(--radius-round);
  background: radial-gradient(closest-side,
    color-mix(in srgb, var(--glow) 26%, transparent),
    color-mix(in srgb, var(--glow) 9%, transparent) 48%,
    transparent);
  opacity: var(--lamp-intensity);
  z-index: 0;
  transition: opacity 0.7s var(--ease);
  animation: lamp-breathe 7s ease-in-out infinite;
}
.lamp-beam {
  left: 43.6%; top: 44%;
  width: calc(var(--lamp-w, 220px) * 1.55);
  height: calc(var(--lamp-w, 220px) * 1.4);
  translate: -50% 0;
  clip-path: polygon(39% 0, 61% 0, 100% 100%, 0 100%);
  background: linear-gradient(to bottom,
    color-mix(in srgb, var(--glow) 36%, transparent),
    color-mix(in srgb, var(--glow) 10%, transparent) 70%,
    transparent);
  filter: blur(5px);
  mix-blend-mode: screen;
  opacity: var(--lamp-intensity);
  z-index: 1;
  transition: opacity 0.7s var(--ease);
}
.lamp-pool {
  left: 43.6%;
  top: calc(44% + var(--lamp-w, 220px) * 1.4);
  width: calc(var(--lamp-w, 220px) * 2);
  height: calc(var(--lamp-w, 220px) * 0.46);
  translate: -50% -50%;
  border-radius: var(--radius-round);
  background: radial-gradient(closest-side,
    color-mix(in srgb, var(--glow) 34%, transparent),
    color-mix(in srgb, var(--glow) 12%, transparent) 55%,
    transparent);
  mix-blend-mode: screen;
  opacity: var(--lamp-intensity);
  z-index: 1;
  transition: opacity 0.7s var(--ease);
}
.lamp-bulb {
  left: 43.6%; top: 44.2%;
  width: calc(var(--lamp-w, 220px) * 0.34);
  height: calc(var(--lamp-w, 220px) * 0.06);
  translate: -50% -35%;
  border-radius: var(--radius-round);
  background: radial-gradient(closest-side, var(--bulb), color-mix(in srgb, var(--glow) 70%, transparent) 55%, transparent);
  box-shadow: 0 0 22px 6px color-mix(in srgb, var(--glow) 45%, transparent);
  opacity: var(--bulb-on);
  z-index: 4;
  transition: opacity 0.5s var(--ease);
}

.lamp .stop-glass-hi { stop-color: var(--lamp-green-bright); }
.lamp .stop-glass { stop-color: var(--lamp-green); }
.lamp .stop-glass-lo { stop-color: var(--lamp-green-deep); }
.lamp .stop-brass-lo { stop-color: var(--brass-dark); }
.lamp .stop-brass-hi { stop-color: var(--brass-bright); }
.lamp .lamp-metal { fill: url(#lampBrass); }
.lamp .lamp-metal-dark { fill: var(--brass-dark); }
.lamp .lamp-shade { fill: url(#lampGlass); stroke: var(--lamp-green-deep); stroke-width: 1; }
.lamp .lamp-sheen { fill: none; stroke: var(--lamp-green-bright); stroke-width: 1.4; opacity: 0.55; }
.lamp .lamp-chain { stroke: var(--brass); stroke-width: 1.2; stroke-dasharray: 2 1.6; }

/* 풀체인: 당기면 밤/낮이 바뀐다 */
.chain-pull {
  pointer-events: auto;
  left: 63.6%; top: 43%;
  width: 22px;
  height: calc(var(--lamp-w, 220px) * 0.28);
  translate: -50% 0;
  z-index: 6;
  padding: 0; margin: 0;
  border: 0; background: transparent;
  cursor: pointer;
}
.chain-pull:active { translate: -50% 3px; }

@keyframes lamp-breathe {
  0%, 100% { scale: 1; }
  50% { scale: 1.04; }
}

/* ---------- 11. 아코디언 ---------- */
.accordion { border-top: 1px solid var(--line-strong); }
.accordion details { border-bottom: 1px solid var(--line); }
.accordion summary {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4);
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--text);
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary:hover { color: var(--accent); }
.accordion__mark {
  flex: none;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong);
  color: var(--accent);
}
.accordion__mark .icon { width: 16px; height: 16px; transition: transform 0.35s var(--ease); }
.accordion details[open] .accordion__mark .icon { transform: rotate(45deg); }
.accordion__body { padding: 0 48px 26px 0; color: var(--text-muted); }
.accordion__body p + p { margin-top: var(--sp-3); }

@supports (interpolate-size: allow-keywords) {
  .accordion { interpolate-size: allow-keywords; }
  .accordion details::details-content {
    block-size: 0; overflow: clip;
    transition: block-size 0.4s var(--ease), content-visibility 0.4s allow-discrete;
  }
  .accordion details[open]::details-content { block-size: auto; }
}

/* ---------- 12. 등장 (흐림 → 선명) ---------- */
/* 완전 투명에서 시작하지 않는다. JS가 없으면 lb-motion 클래스가 없어 처음부터 선명하다. */
.lb-motion [data-reveal] {
  transition:
    filter 1s var(--ease) var(--reveal-delay, 0ms),
    opacity 1s var(--ease) var(--reveal-delay, 0ms),
    translate 1s var(--ease) var(--reveal-delay, 0ms);
}
.lb-motion [data-reveal]:not(.is-revealed) {
  filter: blur(8px);
  opacity: 0.38;
  translate: 0 16px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lb-motion [data-reveal],
  .lb-motion [data-reveal]:not(.is-revealed) { filter: none; opacity: 1; translate: none; transition: none; }
  .lamp-halo { animation: none; }
}