:root {
  --ink: #13231f;
  --muted: #65716d;
  --line: #dce4e0;
  --paper: #f5f7f3;
  --card: #ffffff;
  --green: #10b981;
  --green-dark: #087a58;
  --green-pale: #dff7ed;
  --navy: #142925;
  --mono: "DM Mono", monospace;
  --sans: "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    linear-gradient(rgba(19, 35, 31, .032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 35, 31, .032) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.page-shell { max-width: 1440px; margin: 0 auto; padding: 0 40px; }
.topbar {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--ink);
}
.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.35;
  letter-spacing: .08em;
}
.brand strong { font-size: 12px; }
.brand-mark {
  width: 35px;
  height: 35px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  align-items: end;
  padding: 6px;
  background: var(--ink);
}
.brand-mark i { display: block; background: var(--green); height: 50%; }
.brand-mark i:nth-child(2) { height: 100%; }
.brand-mark i:nth-child(3) { height: 72%; }
.topbar-meta {
  font: 500 11px/1 var(--mono);
  letter-spacing: .03em;
  display: flex;
  align-items: center;
  gap: 9px;
}
.live-dot {
  width: 8px;
  height: 8px;
  display: inline-block;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, .13);
}

.hero {
  min-height: 600px;
  display: grid;
  grid-template-columns: minmax(0, .94fr) minmax(440px, .82fr);
  align-items: center;
  gap: 8vw;
  padding: 88px 0 96px;
  border-bottom: 1px solid var(--ink);
}
.eyebrow, .section-kicker {
  margin: 0 0 22px;
  font: 500 11px/1.4 var(--mono);
  letter-spacing: .1em;
  color: var(--green-dark);
}
h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(56px, 6.4vw, 98px);
  line-height: .98;
  letter-spacing: -.065em;
  font-weight: 700;
}
h1 em { color: var(--green-dark); font-style: normal; }
.hero-description {
  max-width: 580px;
  margin: 32px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
  word-break: keep-all;
}
.hero-actions { display: flex; gap: 10px; margin-top: 34px; flex-wrap: wrap; }
.button {
  min-height: 52px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  border: 1px solid var(--ink);
  border-radius: 0;
  text-decoration: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: transform .16s ease, background .16s ease, color .16s ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible {
  outline: 3px solid rgba(16, 185, 129, .4);
  outline-offset: 2px;
}
.button-primary { background: var(--ink); color: white; }
.button-primary:hover { background: var(--green-dark); }
.button-secondary { background: transparent; color: var(--ink); }
.button-secondary:hover { background: white; }

.hero-status { border: 1px solid var(--ink); background: rgba(255,255,255,.64); box-shadow: 14px 14px 0 var(--green-pale); }
.status-grid { display: grid; grid-template-columns: repeat(2, 1fr); }
.status-cell { min-height: 154px; padding: 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.status-cell:nth-child(2n) { border-right: 0; }
.status-cell:nth-last-child(-n+2) { border-bottom: 0; }
.status-label { display: block; margin-bottom: 26px; color: var(--muted); font: 500 10px/1 var(--mono); letter-spacing: .1em; }
.status-cell strong { display: block; font: 500 30px/1 var(--mono); letter-spacing: -.04em; }
.status-cell small { display: block; margin-top: 10px; color: var(--muted); font-size: 11px; }
.status-main strong { color: var(--green-dark); }
.accent-cell { background: var(--navy); color: white; }
.accent-cell .status-label, .accent-cell small { color: #a8beb7; }
.accent-cell strong { display: flex; align-items: center; gap: 12px; font-size: 18px; letter-spacing: .03em; }
.status-strip { height: 34px; padding: 0 12px; display: flex; align-items: center; justify-content: space-between; color: #71817b; background: var(--green-pale); border-top: 1px solid var(--ink); font: 500 8px/1 var(--mono); letter-spacing: .06em; }

.workspace, .archive-section { padding: 88px 0; border-bottom: 1px solid var(--ink); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 38px; }
.section-heading h2 { margin: 0; font-size: clamp(34px, 4vw, 54px); letter-spacing: -.045em; line-height: 1; }
.section-heading p:last-child { margin: 0; color: var(--muted); font-size: 12px; }
.section-heading .section-kicker { margin-bottom: 15px; }

.toolbar { display: grid; grid-template-columns: minmax(280px, 1fr) 220px 180px; gap: 10px; margin-bottom: 14px; }
.search-field, .select-field {
  min-height: 50px;
  display: flex;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
}
.search-field { gap: 8px; padding: 0 16px; }
.search-field > span { font: 22px/1 var(--mono); transform: rotate(-20deg); color: var(--muted); }
.search-field input, .select-field select { width: 100%; height: 48px; border: 0; outline: 0; background: transparent; color: var(--ink); }
.select-field { padding-left: 14px; }
.select-field span { flex: 0 0 auto; color: var(--muted); font: 500 9px/1 var(--mono); letter-spacing: .08em; }
.select-field select { padding: 0 14px; cursor: pointer; }

.table-card { background: var(--card); border: 1px solid var(--ink); }
.table-wrap { overflow-x: auto; }
table { width: 100%; min-width: 1060px; border-collapse: collapse; table-layout: fixed; }
th {
  height: 44px;
  padding: 0 14px;
  color: #81908a;
  background: #f7f9f7;
  border-bottom: 1px solid var(--ink);
  text-align: left;
  font: 500 9px/1 var(--mono);
  letter-spacing: .07em;
}
td { padding: 20px 14px; border-bottom: 1px solid var(--line); vertical-align: top; font-size: 13px; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr { transition: background .14s ease; }
tbody tr:hover { background: #f4fbf8; }
th:nth-child(1), td:nth-child(1) { width: 58px; text-align: center; }
th:nth-child(2), td:nth-child(2) { width: 35%; }
th:nth-child(3), td:nth-child(3) { width: 14%; }
th:nth-child(4), td:nth-child(4) { width: 10%; }
th:nth-child(5), td:nth-child(5) { width: 8%; }
th:nth-child(6), td:nth-child(6) { width: 9%; }
th:nth-child(7), td:nth-child(7) { width: 14%; }
th:nth-child(8), td:nth-child(8) { width: 46px; }
.rank-cell { color: var(--green-dark); font: 500 12px/1 var(--mono); }
.course-title { max-width: 480px; font-size: 14px; line-height: 1.5; font-weight: 600; word-break: keep-all; }
.course-tags { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 9px; }
.course-tags span { padding: 4px 7px; color: var(--green-dark); background: var(--green-pale); font-size: 9px; font-weight: 600; }
.price-cell, .rating-cell, .students-cell, .date-cell { font-family: var(--mono); font-size: 11px; }
.rating-cell::before { content: "★ "; color: var(--green); }
.date-cell { color: var(--muted); line-height: 1.5; }
.link-cell a { width: 28px; height: 28px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--line); text-decoration: none; font-family: var(--mono); transition: background .14s ease, color .14s ease; }
.link-cell a:hover { color: white; background: var(--ink); }
.empty-state { padding: 64px 20px; text-align: center; }
.empty-state strong, .empty-state span { display: block; }
.empty-state span { margin-top: 8px; color: var(--muted); font-size: 13px; }

.archive-heading { align-items: end; }
.archive-list { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.archive-item {
  min-height: 150px;
  padding: 22px 0;
  margin-right: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: color .15s ease;
}
.archive-item:nth-child(3n) { margin-right: 0; }
.archive-item:hover { color: var(--green-dark); }
.archive-item-top { display: flex; justify-content: space-between; align-items: center; font: 500 10px/1 var(--mono); }
.archive-item-top span:last-child { width: 28px; height: 28px; display: grid; place-items: center; background: var(--green-pale); }
.archive-item strong { font: 500 24px/1 var(--mono); letter-spacing: -.03em; }
.archive-item small { display: block; margin-top: 9px; color: var(--muted); font-size: 11px; }

.process { padding: 88px 0 96px; }
.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); }
.process-grid > div { min-height: 190px; padding: 28px 28px 0 0; border-right: 1px solid var(--line); }
.process-grid > div:not(:first-child) { padding-left: 28px; }
.process-grid > div:last-child { border-right: 0; }
.process-grid span { display: block; margin-bottom: 34px; color: var(--green-dark); font: 500 11px/1 var(--mono); }
.process-grid strong { font-size: 17px; }
.process-grid p { max-width: 330px; margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; word-break: keep-all; }

footer { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-top: 1px solid var(--ink); color: var(--muted); font-size: 11px; }
footer a { color: var(--ink); text-decoration: none; font-weight: 600; }
.sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }

@media (max-width: 980px) {
  .page-shell { padding: 0 24px; }
  .hero { grid-template-columns: 1fr; gap: 58px; padding: 72px 0 84px; }
  .hero-status { max-width: 620px; }
  .toolbar { grid-template-columns: 1fr 1fr; }
  .search-field { grid-column: 1 / -1; }
  .archive-list { grid-template-columns: repeat(2, 1fr); }
  .archive-item:nth-child(3n) { margin-right: 28px; }
  .archive-item:nth-child(2n) { margin-right: 0; }
}

@media (max-width: 640px) {
  .page-shell { padding: 0 16px; }
  .topbar { min-height: 72px; }
  .topbar-meta span:last-child { display: none; }
  .hero { min-height: 0; padding: 58px 0 70px; }
  h1 { font-size: clamp(48px, 15.5vw, 74px); }
  .hero-description { font-size: 15px; }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; justify-content: space-between; }
  .status-cell { min-height: 136px; padding: 18px; }
  .status-cell strong { font-size: 22px; }
  .status-label { margin-bottom: 22px; font-size: 8px; }
  .workspace, .archive-section, .process { padding: 64px 0; }
  .section-heading { display: block; }
  .section-heading > p:last-child { margin-top: 16px; }
  .toolbar { grid-template-columns: 1fr; }
  .search-field { grid-column: auto; }
  .archive-list { grid-template-columns: 1fr; }
  .archive-item, .archive-item:nth-child(2n), .archive-item:nth-child(3n) { margin-right: 0; }
  .process-grid { grid-template-columns: 1fr; }
  .process-grid > div, .process-grid > div:not(:first-child) { min-height: 0; padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .process-grid span { margin-bottom: 22px; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; padding: 24px 0; line-height: 1.6; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}