/* ============================================================
   vercel-overlay.css — Vercel design system overlay
   순서: tokens.css (M3 base) → slide-base.css → vercel-overlay.css (이 파일이 최종 cascade)
   기반: DESIGN.md 원문 토큰 (수정 금지)
   ============================================================ */

/* ---------- Geist font (full weight range 100-900 for thin/heavy contrast) ---------- */
@import url("https://fonts.googleapis.com/css2?family=Geist:wght@100..900&family=Geist+Mono:wght@100..900&display=swap");

:root {
  /* ---------- Font stack — Geist + Pretendard (한글 fallback) ---------- */
  --font-ko-display: "Geist", "Pretendard Variable", "Pretendard", system-ui, sans-serif;
  --font-ko-body: "Geist", "Pretendard", system-ui, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", "Roboto Mono", monospace;

  /* ---------- Type scale v7 — GSHR 가독성 ↑ (slide-base와 동기화) ---------- */
  --fs-chrome: 18px;       /* footer + fine print */
  --fs-min: 22px;          /* labels min */
  --fs-body: 28px;
  --fs-strong: 36px;
  --fs-quote: 44px;
  --fs-title: 54px;
  --fs-governing: 64px;
  --fs-numeric: 80px;
  --fs-stat: 88px;

  /* ---------- Vercel color tokens (DESIGN.md 그대로) ---------- */
  --vc-black: #171717;
  --vc-white: #ffffff;
  --vc-gray-900: #171717;
  --vc-gray-600: #4d4d4d;
  --vc-gray-500: #666666;
  --vc-gray-400: #808080;
  --vc-gray-100: #ebebeb;
  --vc-gray-50: #fafafa;
  --vc-blue: #0a72ef;
  --vc-pink: #de1d8d;
  --vc-red: #ff5b4f;
  --vc-link: #0072f5;
  --vc-focus: hsla(212, 100%, 48%, 1);
  --vc-badge-bg: #ebf5ff;
  --vc-badge-text: #0068d6;

  /* ---------- Override Material 3 tokens to Vercel monochrome ---------- */
  --md-surface: #ffffff;
  --md-on-surface: #171717;
  --md-on-surface-variant: #4d4d4d;
  --md-background: #ffffff;
  --md-on-background: #171717;

  /* primary = black (monochrome philosophy) */
  --md-primary: #171717;
  --md-on-primary: #ffffff;
  --md-primary-container: #fafafa;
  --md-on-primary-container: #171717;

  /* tertiary = Develop Blue (workflow accent only) */
  --md-tertiary: #0a72ef;
  --md-on-tertiary: #ffffff;
  --md-tertiary-container: #ebf5ff;
  --md-on-tertiary-container: #0068d6;

  /* secondary = Preview Pink */
  --md-secondary: #de1d8d;
  --md-secondary-container: #fce7f3;
  --md-on-secondary-container: #831843;

  --md-outline: #808080;
  --md-outline-variant: #ebebeb;

  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #fafafa;
  --md-surface-container: #f3f3f3;
  --md-surface-container-high: #ebebeb;
  --md-surface-container-highest: #e5e5e5;

  --md-inverse-surface: #171717;
  --md-inverse-on-surface: #ffffff;
  --md-inverse-primary: #fafafa;
}

/* ---------- Body base ---------- */
body.slide-body {
  font-family: var(--font-ko-body);
  -webkit-font-feature-settings: "liga", "calt";
  font-feature-settings: "liga", "calt";
}

/* ============================================================
   Slide canvas — clean white, no fills
   ============================================================ */
.slide {
  background: var(--vc-white);
}

/* ============================================================
   Header — pushed down + tighter gap + no divider line
   ============================================================ */
.slide-header-zone {
  padding: 48px 80px 0;
  gap: 0;
}

/* Meta strip — bigger, NO bottom line, tighter gap to governing */
.slide-meta {
  display: flex !important;
  align-items: center;
  gap: 24px;
  margin: 0 0 24px;     /* tighter — was 56 */
  padding: 0;            /* no bottom padding — line removed */
  box-shadow: none;      /* divider line removed */
}

/* Workflow dot — bigger anchor */
.slide-meta::before {
  content: "";
  width: 16px;
  height: 16px;
  background: var(--vc-blue);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 5px var(--vc-badge-bg);
}

/* Label — bigger + heavy weight 700, black */
.slide-meta-label {
  flex: 1;
  font: 700 26px/1 var(--font-mono);
  color: var(--vc-black);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  margin: 0;
}

.slide-meta-label::before {
  display: none;
}

/* Id 제거 — 우측 상단 페이지 표시 */
.slide-meta-id {
  display: none;
}

/* ============================================================
   Governing — weight contrast (light setup + heavy emphasis)
   "얇고 굵음" 적극 활용
   ============================================================ */
.slide-governing {
  font: 300 var(--fs-governing)/1.1 var(--font-ko-display);
  color: var(--vc-black);
  letter-spacing: -2.5px;
  margin: 0;
  max-width: 1640px;
  -webkit-font-feature-settings: "liga", "ss01";
  font-feature-settings: "liga", "ss01";
}

/* Heavy emphasis word — Pretendard 800 vs 300 surrounding */
.slide-governing strong,
.slide-governing em {
  font-weight: 800;
  font-style: normal;
  color: var(--vc-black);
  background: transparent;
  padding: 0;
  border-radius: 0;
  box-shadow: none;
  letter-spacing: -2.8px;
}

/* ============================================================
   Footer — page number right-aligned, no brand text
   ============================================================ */
.slide-footer-zone {
  background: var(--vc-white);
  box-shadow: rgba(0, 0, 0, 0.08) 0px 1px 0px 0px inset;
  padding: 22px 80px;
  justify-content: flex-end;
  position: relative;
}

/* ============================================================
   IMPACT BOOST — slide-wide enhancements
   ============================================================ */

/* (1) Big slide-number background — REMOVED per feedback */

/* 2. Workflow color signposting via data-act */
.slide[data-act="1"] .slide-meta::before { background: var(--vc-blue); }
.slide[data-act="2"] .slide-meta::before { background: var(--vc-pink); }
.slide[data-act="3"] .slide-meta::before { background: var(--vc-red); }

/* Top edge color strip per Act */
.slide[data-act]::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 4px;
  width: 100%;
  z-index: 5;
  pointer-events: none;
}
.slide[data-act="1"]::after { background: var(--vc-blue); }
.slide[data-act="2"]::after { background: var(--vc-pink); }
.slide[data-act="3"]::after { background: var(--vc-red); }

/* Progress bar — REMOVED per feedback */

/* 3. Stagger reveal animation on slide load */
@keyframes stagger-rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.slide-header-zone .slide-meta {
  animation: stagger-rise 600ms cubic-bezier(0.2, 0.8, 0.2, 1) 80ms both;
}
.slide-header-zone .slide-governing {
  animation: stagger-rise 700ms cubic-bezier(0.2, 0.8, 0.2, 1) 200ms both;
}
.slide-body-zone {
  animation: stagger-rise 700ms cubic-bezier(0.2, 0.8, 0.2, 1) 320ms both;
}
.slide-footer-zone {
  animation: stagger-rise 500ms cubic-bezier(0.2, 0.8, 0.2, 1) 460ms both;
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
  .slide-header-zone .slide-meta,
  .slide-header-zone .slide-governing,
  .slide-body-zone,
  .slide-footer-zone {
    animation: none;
  }
}

/* (4) Italic em — REMOVED per feedback */

/* 5. Voice-slide treatment — Crystal voice 강조 슬라이드 */
.voice-slide .slide-governing,
.voice-slide .layout-message .message-main {
  position: relative;
}

.voice-slide .slide-governing::before {
  content: "“";
  position: absolute;
  top: -64px;
  left: -24px;
  font: 900 240px/1 var(--font-ko-display);
  color: rgba(10, 114, 239, 0.08);
  letter-spacing: -8px;
  z-index: -1;
  pointer-events: none;
}

/* 6. Strong divider (Act transition) */
.slide.l-divider {
  position: relative;
}

.slide.l-divider::before {
  content: attr(data-slide);
  position: absolute;
  top: 24%;
  right: 80px;
  font: 100 480px/0.85 var(--font-mono);
  color: rgba(255, 255, 255, 0.06);
  letter-spacing: -20px;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  z-index: 0;
}

.divider-act {
  font-size: 22px;
  letter-spacing: 1px;
}

.divider-title {
  font-size: 128px;
  letter-spacing: -3.5px;
  line-height: 1;
}

/* (7) Asymmetric variation — REMOVED per feedback */

/* 8. Bigger Mono running head (label) — editorial weight */
.slide-meta-label {
  font-size: 24px;
  font-weight: 600;
}

/* 9. Governing — light base (300) + heavy strong (800) for cover-style contrast (2026-05-06 통일) */
.slide-governing {
  font-weight: 300;
}

.slide-governing strong {
  font-weight: 800;
}

/* 10. Page progress generation via JS-free CSS (counter approach for 46 steps) */
/* Each slide has its progress encoded in an inline style or computed selector */

.slide-brand {
  font: 600 var(--fs-chrome)/1 var(--font-mono);
  color: var(--vc-gray-600);
  letter-spacing: 0;
  text-transform: uppercase;
  gap: 12px;
}

.slide-brand::before {
  background: var(--vc-black);
  width: 8px;
  height: 8px;
}

.slide-page-num {
  font: 700 var(--fs-chrome)/1 var(--font-mono);
  color: var(--vc-black);
  letter-spacing: 0;
}

.slide-page-total {
  font: 400 var(--fs-chrome)/1 var(--font-mono);
  color: var(--vc-gray-500);
  letter-spacing: 0;
}

/* ============================================================
   Cards — shadow-as-border (Vercel signature)
   ============================================================ */
.compare-card.muted,
.stat-block.muted,
.info-card[data-tone="surface"],
.persona-card[data-tone="muted"],
.case-figure,
.curve-viz,
.selection-viz,
.trap-row {
  background: var(--vc-white);
  outline: none;
  border: none;
  box-shadow:
    rgba(0, 0, 0, 0.08) 0px 0px 0px 1px,
    rgba(0, 0, 0, 0.04) 0px 2px 2px,
    rgba(0, 0, 0, 0.04) 0px 8px 8px -8px,
    #fafafa 0px 0px 0px 1px inset;
}

.compare-card.signal,
.stat-block.signal {
  background: var(--vc-black);
  color: var(--vc-white);
  box-shadow:
    rgba(0, 0, 0, 0.18) 0px 0px 0px 1px,
    rgba(0, 0, 0, 0.10) 0px 4px 8px;
}

.info-card[data-tone="primary"] {
  background: var(--vc-black);
  color: var(--vc-white);
}

.info-card[data-tone="tertiary"] {
  background: var(--vc-badge-bg);
  color: var(--vc-badge-text);
}

.info-card[data-tone="secondary"] {
  background: var(--vc-gray-50);
  color: var(--vc-black);
}

/* ============================================================
   Quad / Persona / Compare card icons — bare stroke
   ============================================================ */
.quad-icon,
.persona-icon-frame {
  background: transparent;
  width: 36px;
  height: 36px;
}

.quad-icon svg,
.persona-icon-frame svg {
  stroke-width: 1.5;
  opacity: 0.55;
}

/* ============================================================
   COVER SLIDE PATTERN (LOCKED — DOCUMENTED EXCEPTION)
   ============================================================
   표지 슬라이드는 의도적으로 표준 3-zone 패턴을 벗어남.

   표준 슬라이드:
     header.slide-header-zone   (meta + governing)
     main.slide-body-zone       (layout-x content)
     footer.slide-footer-zone   (page)

   표지 (l-title):
     figure.cover-image         (이미지 영역, 1fr)        ← row 1
     header.slide-header-zone   (meta + governing + speaker) ← row 2
     footer.slide-footer-zone   (page)                    ← row 3

   고정 룰 (변경 금지):
     • Grid: 1fr auto auto (이미지 dominate)
     • 이미지 swap: <figure class="cover-image" style="background-image: url('...')">
     • Speaker chip은 header-zone 안에 (title과 함께)
     • is-cover 모디파이어로 거버닝 사이즈 조정
     • 클래스 prefix: cover-*

   재구조화 금지 — 명시 요청 없이 본 패턴 변경 X.
   ============================================================
   Title cover — IMAGE TOP + title below
   ============================================================ */
.slide.l-title {
  background: var(--vc-white);
  position: relative;
  overflow: hidden;
  grid-template-rows: 1fr auto auto;  /* image / title / footer */
}

/* Image area — fills top portion */
.slide.l-title .cover-image {
  grid-row: 1;
  background-color: var(--vc-gray-50);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 16px;
  margin: 32px 80px 0;
  position: relative;
  overflow: hidden;
  min-height: 0;
}

/* Header zone now sits BELOW image — holds title + speaker */
.slide.l-title .slide-header-zone {
  grid-row: 2;
  padding: 28px 80px 24px;
  gap: 16px;
}

/* Footer */
.slide.l-title .slide-footer-zone {
  grid-row: 3;
}

/* Placeholder UI when no image */
.cover-image-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--vc-gray-400);
  pointer-events: none;
}

/* Hide placeholder when background-image is set inline */
.cover-image[style*="background-image"] .cover-image-placeholder {
  display: none;
}

.cover-image-placeholder svg {
  width: 72px;
  height: 72px;
  opacity: 0.5;
  stroke-width: 1.5;
}

.cover-image-placeholder .label {
  font: 600 22px/1 var(--font-mono);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.cover-image-placeholder .hint {
  font: 400 16px/1.4 var(--font-mono);
  opacity: 0.7;
  text-align: center;
  max-width: 480px;
}

/* is-cover는 .slide-governing 스펙을 그대로 상속 (별도 override 제거 — Crystal 통일 요청 2026-05-06) */
.slide-governing.is-cover {
  /* 의도적으로 빈 selector — 상속만 받음 */
}
.slide-governing.is-cover strong,
.slide-governing.is-cover em {
  /* 의도적으로 빈 selector — .slide-governing strong/em 그대로 상속 */
}

/* .thin / .medium 클래스가 있어도 무시 (단순화) */
.slide-governing.is-cover .thin,
.slide-governing.is-cover .medium {
  font-weight: inherit;
  letter-spacing: inherit;
}

.cover-sub {
  font: 300 28px/1.5 var(--font-ko-display);
  color: var(--vc-gray-600);
  letter-spacing: -0.4px;
  margin: 0;
}

.cover-speaker {
  background: var(--vc-black);
  color: var(--vc-white);
  border-radius: 8px;
  padding: 18px 28px;
  font: 700 26px/1 var(--font-mono);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: none;
  align-self: flex-start;
}

.cover-speaker::before {
  background: var(--vc-blue);
  width: 12px;
  height: 12px;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.2);
}

.cover-speaker .role {
  font-size: 22px;
}

/* Header/footer in title slide override */
.slide.l-title .slide-meta {
  display: flex !important;
}

.slide.l-title .slide-meta::before {
  background: var(--vc-blue);
}

.slide.l-title .slide-meta-label {
  color: var(--vc-black);
}

.cover-speaker::before {
  background: var(--vc-blue);
}

.cover-speaker .role {
  border-left-color: rgba(255, 255, 255, 0.25);
  font-family: var(--font-mono);
}

/* ============================================================
   Inline emphasis — Vercel pill badge style
   ============================================================ */
.kw {
  color: var(--vc-black);
  font-weight: 600;
}

.mark-hi,
.mark-hi-primary {
  background: var(--vc-badge-bg);
  color: var(--vc-badge-text);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.pill-primary {
  background: var(--vc-black);
  color: var(--vc-white);
  padding: 6px 14px;
  border-radius: 9999px;
  font: 500 16px/1 var(--font-mono);
  letter-spacing: 0;
  text-transform: uppercase;
}

.pill-outline {
  background: transparent;
  color: var(--vc-black);
  border: none;
  box-shadow: rgba(0, 0, 0, 0.08) 0px 0px 0px 1px;
  padding: 6px 14px;
  border-radius: 9999px;
  font: 500 16px/1 var(--font-mono);
  letter-spacing: 0;
  text-transform: uppercase;
}

/* ============================================================
   Memo note — sharper edges, shadow-as-border
   ============================================================ */
.memo-note {
  background: var(--vc-white);
  border: none;
  box-shadow:
    rgba(0, 0, 0, 0.08) 0px 0px 0px 1px,
    rgba(0, 0, 0, 0.04) 0px 2px 2px;
  border-radius: 8px;
}

.memo-note::before {
  background: var(--vc-blue);
  opacity: 0.85;
}

.memo-body {
  color: var(--vc-gray-600);
}

/* ============================================================
   Splitbar / Stage / etc — black emphasis
   ============================================================ */
.splitbar-fill.signal {
  background: var(--vc-black);
}

.splitbar-fill.muted {
  background: var(--vc-gray-50);
  color: var(--vc-gray-600);
}

.splitbar-track {
  outline: none;
  box-shadow: rgba(0, 0, 0, 0.08) 0px 0px 0px 1px;
}

.splitbar-caption strong {
  color: var(--vc-black);
}

.stage-step.is-current::after {
  background: linear-gradient(to top,
    rgba(23, 23, 23, 0.92) 0%,
    rgba(23, 23, 23, 0.65) 38%,
    rgba(23, 23, 23, 0.25) 70%,
    rgba(23, 23, 23, 0) 100%);
}

.stage-num {
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.stage-step.is-current .stage-num {
  background: var(--vc-white);
  color: var(--vc-black);
  border-color: var(--vc-white);
}

/* ============================================================
   Selection grid — Vercel monochrome
   ============================================================ */
.dot.is-noise {
  background: var(--vc-gray-100);
  opacity: 1;
}

.dot.is-signal {
  background: var(--vc-black);
  box-shadow: 0px 0px 0px 1px var(--vc-black);
}

.dot.is-signal::after {
  border-color: var(--vc-black);
  opacity: 0.2;
}

.selection-list li {
  background: var(--vc-gray-50);
  color: var(--vc-black);
}

.selection-list .rank {
  color: var(--vc-blue);
}

.selection-stat {
  color: var(--vc-black);
}

/* ============================================================
   Stat block — Vercel metric card style
   ============================================================ */
.stat-num {
  letter-spacing: -3px;
  font-weight: 600;
}

/* ============================================================
   Trap table — minimal row
   ============================================================ */
.trap-row.is-key {
  background: var(--vc-black);
  color: var(--vc-white);
  box-shadow: rgba(0, 0, 0, 0.18) 0px 0px 0px 1px;
}

.trap-num {
  background: var(--vc-gray-50);
  color: var(--vc-black);
  font-family: var(--font-mono);
  border-radius: 4px;
  width: 40px;
  height: 40px;
  font-size: 18px;
  font-weight: 600;
}

.trap-row.is-key .trap-num {
  background: var(--vc-white);
  color: var(--vc-black);
}

/* ============================================================
   Curve / Ctx list / etc — refinements
   ============================================================ */
.ctx-bullet {
  width: 8px;
  height: 8px;
  background: var(--vc-black);
  box-shadow: none;
}

.ctx-row:nth-child(2) .ctx-bullet { background: var(--vc-blue); }
.ctx-row:nth-child(3) .ctx-bullet { background: var(--vc-pink); }
.ctx-row:nth-child(4) .ctx-bullet { background: var(--vc-red); }

.ctx-label {
  font: 500 var(--fs-min)/1 var(--font-mono);
  color: var(--vc-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.case-num-mark .num {
  color: var(--vc-black);
  font-weight: 600;
  letter-spacing: -2px;
  opacity: 1;
}

.case-num-mark .lbl {
  font: 500 18px/1.3 var(--font-mono);
  color: var(--vc-gray-500);
  text-transform: uppercase;
  letter-spacing: 0;
}

.case-title {
  color: var(--vc-black);
  font-weight: 600;
  letter-spacing: -1.5px;
}

.case-figure-tag {
  background: var(--vc-black);
  color: var(--vc-white);
  font: 600 16px/1 var(--font-mono);
  letter-spacing: 0;
  padding: 10px 14px;
}

.case-figure-icon {
  color: var(--vc-gray-400);
}

/* ============================================================
   Compare arrow — minimal
   ============================================================ */
.compare-arrow-icon,
.stat-arrow-icon {
  color: var(--vc-black);
  font-weight: 600;
}

.compare-card-eyebrow,
.stat-label {
  font: 500 var(--fs-min)/1 var(--font-mono);
  letter-spacing: 0;
  text-transform: uppercase;
}

/* ============================================================
   Divider (dark) — true black
   ============================================================ */
.slide.l-divider {
  background: var(--vc-black);
}

.divider-title {
  color: var(--vc-white);
  letter-spacing: -2.5px;
}

.divider-act {
  color: var(--vc-blue);
  font-family: var(--font-mono);
  letter-spacing: 0;
  text-transform: uppercase;
}

.divider-act::before {
  background: var(--vc-blue);
}

/* Footer override on dark slide */
.slide.l-divider .slide-footer-zone {
  background: rgba(0, 0, 0, 0.3);
}