/* reset + 타이포 */
*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }
/* 가로 스크롤바 깜빡임 방지 — clip은 hidden보다 안전(스크롤 컨테이너 미생성, position:sticky 비파괴) */
html, body { overflow-x: clip; }
body {
  font-family: var(--font-sans);
  font-size: var(--fz-16);
  line-height: var(--lh-base);
  color: var(--ink);
  background:
    radial-gradient(1000px 650px at 10% -10%, rgba(31,58,138,0.10), transparent 60%),
    radial-gradient(800px 550px at 110% 110%, rgba(31,58,138,0.08), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:root[data-theme="dark"] body {
  background:
    radial-gradient(1100px 600px at 12% -10%, rgba(138,180,248,0.10), transparent 60%),
    radial-gradient(900px 500px at 110% 110%, rgba(46,80,181,0.08), transparent 55%),
    var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }
input, select, textarea, button { font-family: inherit; color: inherit; }
hr { border: 0; border-top: 1px solid var(--line); margin: var(--space-6) 0; }

ul, ol { padding-left: 1.2em; }
.list-bare { list-style: none; padding: 0; margin: 0; }

/* Typo classes */
.t-display    { font-family: var(--font-serif); font-size: clamp(36px, 5.4vw, var(--fz-56)); line-height: var(--lh-tight); font-weight: 600; letter-spacing: -.02em; }
.t-h1         { font-family: var(--font-serif); font-size: clamp(28px, 4vw, var(--fz-40)); line-height: 1.18; font-weight: 600; letter-spacing: -.015em; }
.t-h2         { font-size: var(--fz-28); line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
.t-h3         { font-size: var(--fz-20); line-height: var(--lh-snug); font-weight: 600; }
.t-body-lg    { font-size: var(--fz-18); line-height: 1.75; }
.t-body       { font-size: var(--fz-16); line-height: var(--lh-base); }
.t-body-sm    { font-size: var(--fz-14); line-height: 1.6; }
.t-caption    { font-size: var(--fz-12); line-height: 1.5; font-weight: 500; color: var(--ink-mute); letter-spacing: 0.02em; }
.t-mono       { font-family: var(--font-mono); font-size: var(--fz-13); }
.editor-prose { font-family: var(--font-serif); font-size: var(--fz-18); line-height: 1.85; color: var(--ink); }

.muted { color: var(--ink-mute); }
.accent-text { color: var(--accent); }
.copper { color: var(--brand-copper); }
:root[data-theme="dark"] .copper { color: var(--accent-soft); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2);
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--fz-14);
  cursor: pointer;
  text-decoration: none !important;
  transition:
    transform var(--dur-3) var(--easing-emphasis),
    box-shadow var(--dur-3) var(--easing-emphasis),
    background var(--dur-2) var(--easing-standard),
    border-color var(--dur-2) var(--easing-standard),
    color var(--dur-2) var(--easing-standard);
  white-space: nowrap;
  user-select: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55; cursor: not-allowed; transform: none !important;
  box-shadow: none !important;
}
.btn--primary {
  background: var(--accent); color: var(--accent-on);
  box-shadow: 0 8px 20px rgba(31,58,138,0.40), 0 1px 0 rgba(255,255,255,0.18) inset;
  border-color: var(--brand-indigo);
}
.btn--primary:hover { box-shadow: 0 12px 28px rgba(31,58,138,0.50), 0 1px 0 rgba(255,255,255,0.22) inset; }
:root[data-theme="dark"] .btn--primary { box-shadow: 0 8px 22px rgba(138,180,248,0.35), 0 1px 0 rgba(255,255,255,0.10) inset; }
.btn--accent {
  background: var(--brand-indigo);
  color: #FFFFFF;
  box-shadow: 0 10px 26px rgba(31,58,138,0.40), 0 1px 0 rgba(255,255,255,0.18) inset;
  border-color: var(--brand-indigo-deep);
}
.btn--accent:hover {
  background: var(--brand-indigo-deep);
  box-shadow: 0 14px 34px rgba(31,58,138,0.55), 0 1px 0 rgba(255,255,255,0.22) inset;
}
:root[data-theme="dark"] .btn--accent {
  background: var(--accent);
  color: #0A1226;
  border-color: rgba(138,180,248,0.65);
}
:root[data-theme="dark"] .btn--accent:hover {
  background: #A6C3FA;
}
.btn--ghost {
  background: var(--surface-glass-2);
  color: var(--ink);
  border-color: var(--line-strong);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 8px rgba(14,28,64,0.08);
}
.btn--ghost:hover { border-color: var(--accent); background: var(--surface); box-shadow: 0 6px 16px rgba(14,28,64,0.14); }
.btn--lg { padding: 14px 24px; font-size: var(--fz-15); }
.btn--sm { padding: 6px 12px; font-size: var(--fz-13); }
.btn--icon { padding: 8px; aspect-ratio: 1; }

.badge {
  display: inline-flex; align-items: center; padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(31,58,138,0.08);
  color: var(--accent);
  font-size: var(--fz-12); font-weight: 600; letter-spacing: 0.02em;
}
:root[data-theme="dark"] .badge { background: rgba(138,180,248,0.14); }
.badge--copper {
  background: rgba(31,58,138,0.16); color: var(--brand-copper);
}
:root[data-theme="dark"] .badge--copper {
  background: rgba(46,80,181,0.18); color: var(--accent-soft);
}
.badge--soft {
  background: var(--surface-glass-2);
  color: var(--ink-mute);
  border: 1px solid var(--line);
}

/* Skip link */
.skip {
  position: absolute; left: -9999px; top: auto;
  background: var(--accent); color: #fff; padding: 8px 12px; border-radius: 6px;
  z-index: 999;
}
.skip:focus { left: 12px; top: 12px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--space-6); }
.container--narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--space-6); }

.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;
}

/* Page fade */
.page { animation: pageIn var(--dur-4) var(--easing-enter) both; }
@keyframes pageIn { from { opacity: 0; transform: translateY(4px);} to { opacity: 1; transform: none; } }

/* Hero text accent — 단일 진파랑 (그라디언트 제거) */
.text-gradient { color: var(--brand-indigo); }
:root[data-theme="dark"] .text-gradient { color: var(--accent); }