/* Website Design: base styles. Mobile first; one breakpoint at 768px (tablet/PC). */

/* ---------- Tokens ---------- */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #1a1d21;
  --muted: #5f6670;
  --border: #e3e6ea;
  --primary: #2457d6;
  --on-primary: #ffffff;
  --danger: #c62828;
  --radius: 12px;
  --max: 1080px;
  --font: system-ui, -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1a1d23;
    --text: #e7e9ec;
    --muted: #9aa1ab;
    --border: #2a2f37;
    --primary: #6c93ff;
    --on-primary: #0b0d10;
    --danger: #ff6b6b;
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font: 16px/1.6 var(--font);
  color: var(--text);
  background: var(--bg);
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-text-size-adjust: 100%;
}

main { flex: 1 0 auto; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -0.01em; }
h2 { font-size: 20px; }
a { color: var(--primary); }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
.page { padding: 32px 0 56px; }
.section { padding: 8px 0 56px; }
.center { text-align: center; }
.page-title { margin: 0 0 20px; font-size: clamp(24px, 4vw, 32px); }
.page-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.page-head .page-title { margin: 0; }
.muted { color: var(--muted); }
.hint { margin: 8px 0 0; font-size: 13px; color: var(--muted); }
.stack { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; } /* minmax: wide tables scroll instead of widening the page */
.stack > .alert { margin: 0; }

/* ---------- Site header / footer ---------- */
.site-header { border-bottom: 1px solid var(--border); }
.site-nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; min-height: 56px; padding-top: 8px; padding-bottom: 8px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; font-size: 14px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-links form { margin: 0; }

.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 16px; padding-top: 24px; padding-bottom: 24px; }
.footer-links { display: flex; gap: 16px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

/* ---------- Landing ---------- */
.hero { padding: 48px 0 40px; }
.hero h1 { margin: 0 0 16px; font-size: clamp(30px, 7vw, 52px); line-height: 1.2; letter-spacing: -0.02em; }
.lead { margin: 0 0 24px; max-width: 640px; font-size: clamp(16px, 2.4vw, 20px); color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.grid { display: grid; grid-template-columns: 1fr; gap: 16px; }

/* ---------- Components ---------- */
.card { padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.card h2 { font-size: 18px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0 18px;
  font: inherit; font-size: 15px; font-weight: 600; text-decoration: none;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer;
}
.btn:hover { border-color: var(--muted); }
.btn-primary { color: var(--on-primary); background: var(--primary); border-color: var(--primary); }
.btn-primary:hover { border-color: var(--primary); filter: brightness(1.08); }
.btn-small { min-height: 32px; padding: 0 12px; font-size: 13px; }
.btn-danger { color: var(--danger); }
.btn-block { width: 100%; }
.btn-link { padding: 0; font: inherit; color: var(--muted); background: none; border: 0; cursor: pointer; }
.btn-link:hover { color: var(--text); }

.form { display: grid; gap: 16px; }
.field { display: grid; gap: 6px; font-size: 14px; font-weight: 600; }
.input {
  width: 100%; min-height: 44px; padding: 10px 12px;
  font: inherit; font-size: 16px; font-weight: 400; /* 16px stops iOS zoom on focus */
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px;
}
.input:focus { border-color: var(--primary); outline: 2px solid var(--primary); outline-offset: 0; }
.inline-form { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.inline-form .input { flex: 1 1 220px; width: auto; min-width: 0; }

.alert { margin: 0 0 16px; padding: 12px 14px; font-size: 14px; color: var(--danger); border: 1px solid var(--danger); border-radius: 10px; }

.info { display: grid; grid-template-columns: max-content 1fr; gap: 10px 20px; margin: 0; }
.info dt { color: var(--muted); }
.info dd { margin: 0; overflow-wrap: anywhere; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.table { width: 100%; border-collapse: collapse; font-size: 14px; white-space: nowrap; }
.table th, .table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { font-weight: 600; color: var(--muted); background: var(--surface); }
.table tr:last-child td { border-bottom: 0; }
.table form { margin: 0; }
.table .empty { padding: 32px 14px; text-align: center; color: var(--muted); }

.badge { display: inline-block; padding: 2px 8px; font-size: 12px; font-weight: 600; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; vertical-align: middle; }

/* ---------- Login ---------- */
.auth { display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px 64px; }
.auth .card { width: 100%; max-width: 400px; padding: 28px 24px; }
.auth h1 { margin: 0 0 20px; font-size: 24px; }

/* ---------- Admin ---------- */
.admin-topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; padding: 0 16px; background: var(--bg); border-bottom: 1px solid var(--border); }
.topbar-right { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.topbar-right a { color: var(--muted); text-decoration: none; }
.topbar-right a:hover { color: var(--text); }
.topbar-right form { margin: 0; }
.topbar-user { display: none; color: var(--muted); }

.admin-body { flex: 1 0 auto; display: flex; flex-direction: column; }
.admin-sidebar { background: var(--surface); border-bottom: 1px solid var(--border); }
.sidebar-nav { display: flex; gap: 4px; padding: 8px 12px; overflow-x: auto; }
.sidebar-nav a { flex: none; padding: 8px 12px; font-size: 14px; color: var(--muted); text-decoration: none; white-space: nowrap; border-radius: 8px; }
.sidebar-nav a:hover { color: var(--text); }
.sidebar-nav a[aria-current="page"] { font-weight: 600; color: var(--text); background: var(--bg); }
.admin-main { flex: 1; min-width: 0; padding: 24px 16px 48px; }

.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.stat-label { font-size: 13px; color: var(--muted); }
.stat-value { font-size: 28px; font-weight: 700; line-height: 1.2; }

/* ---------- Tablet / PC ---------- */
@media (min-width: 768px) {
  .container { padding: 0 24px; }
  .page { padding: 48px 0 72px; }
  .hero { padding: 80px 0 56px; }
  .section { padding-bottom: 80px; }
  .grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .card { padding: 24px; }
  .nav-links { gap: 4px 20px; font-size: 15px; }
  .auth { padding: 72px 24px 96px; }
  .auth .card { padding: 36px 32px; }

  .admin-topbar { position: sticky; top: 0; z-index: 10; padding: 0 24px; }
  .topbar-user { display: inline; }
  .admin-body { flex-direction: row; }
  .admin-sidebar { flex: none; width: 220px; border-bottom: 0; border-right: 1px solid var(--border); }
  .sidebar-nav { position: sticky; top: 56px; flex-direction: column; padding: 16px 12px; overflow: visible; }
  .admin-main { padding: 32px; }
  .stats { grid-template-columns: repeat(3, 1fr); gap: 16px; }
}