/* =========================================================
   Portfolio — 공유 디자인 시스템
   새 프로젝트 페이지를 만들 때 이 파일만 링크하면
   색상·타이포그래피·기본 컴포넌트가 동일하게 적용됩니다.
   ========================================================= */

:root {
  /* palette — light */
  --ground: #eef2f5;
  --surface: #ffffff;
  --surface-2: #f6f9fb;
  --ink: #14212b;
  --ink-soft: #33454f;
  --muted: #5c6f7b;
  --faint: #8698a3;
  --line: #d7e0e6;
  --line-strong: #c2ced6;
  --accent: #0d6e78;
  --accent-ink: #095057;
  --accent-2: #b0531d;
  --good: #2b7a55;
  --warn: #a86a12;
  --crit: #b6443a;
  --shadow: 0 1px 2px rgba(20, 33, 43, .05), 0 8px 24px rgba(20, 33, 43, .06);

  /* type */
  --mono: "SF Mono", "JetBrains Mono", "Cascadia Code", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue", Arial,
          "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;

  /* layout */
  --maxw: 1120px;
  --prose: 66ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0b131a;
    --surface: #121d25;
    --surface-2: #16232c;
    --ink: #e7eef3;
    --ink-soft: #c2d0d9;
    --muted: #899ba7;
    --faint: #667985;
    --line: #23333d;
    --line-strong: #2f414c;
    --accent: #38b6c0;
    --accent-ink: #7fd6dd;
    --accent-2: #e0894a;
    --good: #46b483;
    --warn: #d19a3c;
    --crit: #e0685d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
  }
}

/* 사용자가 토글로 고른 테마가 OS 설정을 이깁니다 (양방향) */
:root[data-theme="dark"] {
  --ground: #0b131a; --surface: #121d25; --surface-2: #16232c;
  --ink: #e7eef3; --ink-soft: #c2d0d9; --muted: #899ba7; --faint: #667985;
  --line: #23333d; --line-strong: #2f414c;
  --accent: #38b6c0; --accent-ink: #7fd6dd; --accent-2: #e0894a;
  --good: #46b483; --warn: #d19a3c; --crit: #e0685d;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
}
:root[data-theme="light"] {
  --ground: #eef2f5; --surface: #ffffff; --surface-2: #f6f9fb;
  --ink: #14212b; --ink-soft: #33454f; --muted: #5c6f7b; --faint: #8698a3;
  --line: #d7e0e6; --line-strong: #c2ced6;
  --accent: #0d6e78; --accent-ink: #095057; --accent-2: #b0531d;
  --good: #2b7a55; --warn: #a86a12; --crit: #b6443a;
  --shadow: 0 1px 2px rgba(20, 33, 43, .05), 0 8px 24px rgba(20, 33, 43, .06);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video { max-width: 100%; }
button { font: inherit; }

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.prose { max-width: var(--prose); }
h1, h2, h3 { text-wrap: balance; line-height: 1.15; letter-spacing: -0.01em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

section { padding: 68px 0; border-bottom: 1px solid var(--line); }
.sec-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 30px; }
.sec-head h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.05rem); font-weight: 750; }
.sec-sub { color: var(--muted); margin: -14px 0 30px; max-width: var(--prose); }

/* ---------- labels ---------- */
.eyebrow {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--accent-ink); font-weight: 600;
}
.section-num { font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; color: var(--faint); }

/* ---------- chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-family: var(--mono); font-size: .8rem; padding: 4px 10px;
  border: 1px solid var(--line-strong); border-radius: 6px;
  background: var(--surface-2); color: var(--ink-soft);
}
.chip.core {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line-strong));
  color: var(--accent-ink);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .88rem; }
th, td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--faint); font-weight: 600; background: var(--surface-2); position: sticky; top: 0;
}
tbody tr:last-child td { border-bottom: 0; }
td.id { font-family: var(--mono); color: var(--accent-ink); white-space: nowrap; font-variant-numeric: tabular-nums; }
td .cat { font-family: var(--mono); font-size: .72rem; color: var(--muted); }

/* ---------- theme toggle ---------- */
.toggle {
  position: fixed; top: 16px; right: 16px; z-index: 50;
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--surface); border: 1px solid var(--line);
  color: var(--muted); border-radius: 999px;
  padding: 7px 13px; font-family: var(--mono); font-size: .72rem;
  letter-spacing: .04em; cursor: pointer; box-shadow: var(--shadow);
}
.toggle:hover { color: var(--ink); border-color: var(--line-strong); }

/* ---------- back nav (프로젝트 상세 페이지 상단) ---------- */
.backnav { border-bottom: 1px solid var(--line); background: var(--surface); }
.backnav .wrap { display: flex; align-items: center; height: 52px; }
.backnav a { font-family: var(--mono); font-size: .8rem; color: var(--muted); }
.backnav a:hover { color: var(--accent); text-decoration: none; }

/* ---------- footer ---------- */
footer { padding: 54px 0 70px; }
.foot-grid { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.foot-grid .big { font-size: 1.3rem; font-weight: 750; }
.foot-links { display: flex; gap: 8px; flex-direction: column; font-family: var(--mono); font-size: .85rem; }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
}