/* hwp2md V3 — 공통 토큰·기반 스타일. 색·반경·그림자는 Stitch V2 토큰을 그대로 잇는다. */

:root {
  --bg-page: #F6F9FF;
  --surface-main: #FFFFFF;
  --surface-secondary: #EEF4FF;
  --surface-tertiary: #E3EDFC;
  --surface-hover: #F0F6FF;

  --text-primary: #172B4D;
  --text-muted: #5B6B82;
  --text-subtle: #899BB3;
  --text-inverse: #FFFFFF;

  --border-subtle: #E0E8F4;
  --border-strong: #CBD7E8;
  --border-focus: #276EF1;

  --accent-primary: #276EF1;
  --accent-hover: #1E5ED8;
  --accent-active: #154EB8;
  --accent-soft: #E9F2FF;
  --accent-soft-hover: #D9E8FF;
  --accent-text: #1B58C9;

  --status-success: #047857;
  --status-success-soft: #ECFDF5;
  --status-warning: #B45309;
  --status-warning-soft: #FFFBEB;
  --status-error: #DC2626;
  --status-error-soft: #FEF2F2;

  /* 포맷 배지: HWP 파랑, HWPX 에메랄드, Markdown 앰버 (Precision Slate) */
  --badge-hwp: #1B58C9;
  --badge-hwp-soft: #E9F2FF;
  --badge-hwpx: #047857;
  --badge-hwpx-soft: #E7F8F1;
  --badge-md: #A15C07;
  --badge-md-soft: #FFF4E0;

  --code-bg: #F7FAFF;
  --paper: #FFFFFF;
  --paper-line: #DCE5F2;

  --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(16, 24, 40, 0.06), 0 2px 4px -2px rgba(16, 24, 40, 0.03);
  --shadow-lg: 0 12px 24px -4px rgba(16, 24, 40, 0.08), 0 4px 8px -4px rgba(16, 24, 40, 0.04);
  --shadow-drag: 0 0 0 4px rgba(39, 110, 241, 0.16);

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-pill: 9999px;

  --font-base: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-std: cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast: 120ms;
  --t-normal: 200ms;

  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg-page: #0F1624;
  --surface-main: #172133;
  --surface-secondary: #1E2A40;
  --surface-tertiary: #26354F;
  --surface-hover: #213049;
  --text-primary: #F3F7FF;
  --text-muted: #A7B5CA;
  --text-subtle: #8D9EB5;
  --text-inverse: #0F1624;
  --border-subtle: #2C3A52;
  --border-strong: #42526C;
  --border-focus: #81ADFF;
  --accent-primary: #81ADFF;
  --accent-hover: #A4C4FF;
  --accent-active: #BFD6FF;
  --accent-soft: #1E2E4A;
  --accent-soft-hover: #283C60;
  --accent-text: #96BDFF;
  --status-success: #34D399;
  --status-success-soft: #0B3B2E;
  --status-warning: #FBBF24;
  --status-warning-soft: #3D2A0B;
  --status-error: #F87171;
  --status-error-soft: #431B1B;
  --badge-hwp: #96BDFF;
  --badge-hwp-soft: #1E2E4A;
  --badge-hwpx: #5EE0B0;
  --badge-hwpx-soft: #0E3328;
  --badge-md: #F5C064;
  --badge-md-soft: #3A2A10;
  --code-bg: #131C2C;
  --paper: #1B263A;
  --paper-line: #33445F;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.5);
  --shadow-drag: 0 0 0 4px rgba(129, 173, 255, 0.22);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-page: #0F1624;
    --surface-main: #172133;
    --surface-secondary: #1E2A40;
    --surface-tertiary: #26354F;
    --surface-hover: #213049;
    --text-primary: #F3F7FF;
    --text-muted: #A7B5CA;
    --text-subtle: #8D9EB5;
    --text-inverse: #0F1624;
    --border-subtle: #2C3A52;
    --border-strong: #42526C;
    --border-focus: #81ADFF;
    --accent-primary: #81ADFF;
    --accent-hover: #A4C4FF;
    --accent-active: #BFD6FF;
    --accent-soft: #1E2E4A;
    --accent-soft-hover: #283C60;
    --accent-text: #96BDFF;
    --status-success: #34D399;
    --status-success-soft: #0B3B2E;
    --status-warning: #FBBF24;
    --status-warning-soft: #3D2A0B;
    --status-error: #F87171;
    --status-error-soft: #431B1B;
    --badge-hwp: #96BDFF;
    --badge-hwp-soft: #1E2E4A;
    --badge-hwpx: #5EE0B0;
    --badge-hwpx-soft: #0E3328;
    --badge-md: #F5C064;
    --badge-md-soft: #3A2A10;
    --code-bg: #131C2C;
    --paper: #1B263A;
    --paper-line: #33445F;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.5);
    --shadow-drag: 0 0 0 4px rgba(129, 173, 255, 0.22);
    color-scheme: dark;
  }
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
html, body { margin: 0; }
body {
  background: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  word-break: keep-all;
  overflow-wrap: break-word;
}
img, svg { display: block; max-width: 100%; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; letter-spacing: -0.02em; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
a { color: var(--accent-text); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
code, kbd, pre, .mono { font-family: var(--font-mono); font-variant-ligatures: none; }

/* ---------- browser surfaces ---------- */
::selection { background: var(--accent-soft-hover); color: var(--text-primary); }
:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; border-radius: var(--radius-xs); }
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; border: 3px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-track { background: transparent; }
input { caret-color: var(--accent-primary); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- header (두 페이지 공통) ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--surface-main) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}
.site-header__inner {
  max-width: 1280px; margin: 0 auto; height: 64px;
  padding: 0 24px; display: flex; align-items: center; gap: 24px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text-primary); text-decoration: none; font-weight: 700; font-size: 18px; letter-spacing: -0.02em;
}
.brand__mark { width: 26px; height: 26px; color: var(--accent-primary); }
.brand__ver {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600; letter-spacing: 0;
  padding: 2px 7px; border-radius: var(--radius-pill);
  color: var(--accent-text); background: var(--accent-soft); border: 1px solid var(--accent-soft-hover);
}
.site-nav { display: flex; gap: 4px; }
.site-nav a {
  color: var(--text-muted); text-decoration: none; font-size: 14px; font-weight: 500;
  padding: 6px 10px; border-radius: var(--radius-sm);
  transition: color var(--t-normal) var(--ease-std), background var(--t-normal) var(--ease-std);
}
.site-nav a:hover { color: var(--text-primary); background: var(--surface-hover); }
.site-nav a[aria-current="page"] { color: var(--text-primary); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 16px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600; text-decoration: none; white-space: nowrap;
  border: 1px solid transparent; background: none;
  transition: background var(--t-fast) var(--ease-std), border-color var(--t-fast) var(--ease-std), color var(--t-fast) var(--ease-std), transform var(--t-fast) var(--ease-std);
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn--primary { background: var(--accent-primary); color: var(--text-inverse); }
.btn--primary:hover { background: var(--accent-hover); }
.btn--primary:active { background: var(--accent-active); transform: translateY(1px); }
.btn--ghost { border-color: var(--border-strong); color: var(--text-primary); background: var(--surface-main); }
.btn--ghost:hover { background: var(--surface-hover); border-color: var(--accent-primary); }
.btn--sm { height: 32px; padding: 0 12px; font-size: 13px; }
.btn:disabled { background: var(--surface-secondary); border-color: var(--border-subtle); color: var(--text-subtle); cursor: not-allowed; transform: none; }

.icon-btn {
  width: 38px; height: 38px; display: inline-grid; place-items: center;
  border-radius: var(--radius-md); border: 1px solid var(--border-subtle);
  background: var(--surface-main); color: var(--text-muted);
  transition: color var(--t-fast) var(--ease-std), border-color var(--t-fast) var(--ease-std), background var(--t-fast) var(--ease-std);
}
.icon-btn:hover { color: var(--text-primary); border-color: var(--border-strong); background: var(--surface-hover); }
.icon-btn svg { width: 18px; height: 18px; }

/* 테마 아이콘: 라이트에서는 달, 다크에서는 해 */
.theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .i-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .i-moon { display: none; }
}

/* ---------- format badges ---------- */
.badge {
  display: inline-flex; align-items: center; height: 20px; padding: 0 7px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600; letter-spacing: 0.02em;
  border-radius: var(--radius-xs); white-space: nowrap;
}
.badge--hwp { color: var(--badge-hwp); background: var(--badge-hwp-soft); }
.badge--hwpx { color: var(--badge-hwpx); background: var(--badge-hwpx-soft); }
.badge--md { color: var(--badge-md); background: var(--badge-md-soft); }

/* ---------- theme transition (View Transitions) ---------- */
::view-transition-old(root), ::view-transition-new(root) { animation: none; mix-blend-mode: normal; }
::view-transition-new(root) { z-index: 2; }

@media (max-width: 720px) {
  .site-header__inner { padding: 0 16px; gap: 12px; }
  .site-nav { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}

/* ---------- language toggle (KO/EN) ---------- */
.lang-toggle { font-family: var(--font-mono); font-size: 12px; font-weight: 650; letter-spacing: 0.04em; }