/* ===========================================================
   KODE LMS — Clay design system (cream canvas · rounded · saturated cards)
   ref: DESIGN.md
   =========================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* surface */
  --canvas: #fffaf0;
  --surface-soft: #faf5e8;
  --surface-card: #f5f0e0;
  --surface-strong: #ebe6d6;
  --white: #fffdf8;
  /* ink */
  --ink: #0a0a0a;
  --body: #3a3a3a;
  --muted: #6a6a6a;
  --muted-soft: #9a9a9a;
  --hairline: #e7e2d4;
  --hairline-strong: #d9d3c2;
  /* primary */
  --primary: #0a0a0a;
  --primary-active: #1f1f1f;
  --on-primary: #ffffff;
  /* brand */
  --pink: #ff4d8b;
  --teal: #1a3a3a;
  --lavender: #b8a4ed;
  --peach: #ffb084;
  --ochre: #e8b94a;
  --mint: #a4d4c5;
  --coral: #ff6b5a;
  /* semantic */
  --success: #1f9d57;
  --warning: #b7791f;
  --error: #d6453d;
  /* radius */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
  --pill: 9999px;
  --shadow: 0 1px 2px rgba(20, 14, 0, .04);
  --shadow-lift: 0 8px 24px rgba(40, 30, 0, .08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--canvas);
  color: var(--body);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--lavender); color: var(--ink); }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 64px;
  border-bottom: 1px solid var(--hairline);
  background: var(--canvas);
  position: sticky; top: 0; z-index: 10;
}
.topbar .brand { font-weight: 700; letter-spacing: -.02em; font-size: 17px; color: var(--ink);
  display: flex; gap: 10px; align-items: center; }
.topbar .brand .dot { width: 14px; height: 14px; border-radius: 50%;
  background: linear-gradient(135deg, var(--pink), var(--lavender)); }
.topbar .who { color: var(--muted); font-size: 14px; display: flex; gap: 10px; align-items: center; }

.container { max-width: 1180px; margin: 0 auto; padding: 28px 24px 72px; }
.center-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px;
  background:
    radial-gradient(520px 360px at 12% 0%, #fdeef5 0, transparent 60%),
    radial-gradient(560px 380px at 92% 8%, #efeafe 0, transparent 60%),
    var(--canvas); }

/* ---------- card ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 24px;
}

/* ---------- type ---------- */
.h1 { font-size: 26px; font-weight: 700; letter-spacing: -.03em; color: var(--ink); margin: 0 0 4px; }
.sub { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.section-title { font-size: 16px; font-weight: 700; letter-spacing: -.01em; color: var(--ink);
  margin: 0 0 14px; display: flex; gap: 8px; align-items: center; }

/* ---------- form ---------- */
label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin: 14px 0 6px; }
input[type=text], input[type=password], input[type=number], textarea, select {
  width: 100%; padding: 0 14px; height: 44px;
  background: var(--white); color: var(--ink);
  border: 1px solid var(--hairline-strong); border-radius: var(--r-md);
  font-size: 15px; font-family: inherit; outline: none; transition: border-color .15s, box-shadow .15s;
}
textarea { padding: 12px 14px; height: auto; min-height: 96px; resize: vertical; line-height: 1.5; }
input::placeholder, textarea::placeholder { color: var(--muted-soft); }
input:focus, textarea:focus, select:focus { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(10,10,10,.06); }
input[type=file] { padding: 9px 12px; height: auto; background: var(--surface-soft); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 44px; padding: 0 18px; border-radius: var(--r-md);
  border: 1px solid var(--hairline-strong); background: var(--white); color: var(--ink);
  cursor: pointer; font-size: 14px; font-weight: 600; letter-spacing: -.01em;
  transition: .15s; white-space: nowrap;
}
.btn:hover { border-color: var(--ink); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.btn.primary:hover { background: var(--primary-active); border-color: var(--primary-active); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.ghost:hover { background: var(--surface-card); border-color: transparent; color: var(--ink); }
.btn.danger { background: transparent; border-color: var(--error); color: var(--error); }
.btn.danger:hover { background: var(--error); color: #fff; border-color: var(--error); }
.btn.sm { height: 34px; padding: 0 12px; font-size: 13px; }
.btn.block { width: 100%; }

/* ---------- tabs (pill) ---------- */
.tabs { display: inline-flex; gap: 4px; background: var(--surface-card); padding: 4px;
  border-radius: var(--pill); margin-bottom: 8px; }
.tabs button { padding: 9px 18px; border: none; background: transparent; color: var(--muted);
  border-radius: var(--pill); cursor: pointer; font-weight: 600; font-size: 14px; letter-spacing: -.01em; transition: .15s; }
.tabs button:hover { color: var(--ink); }
.tabs button.active { background: var(--white); color: var(--ink); box-shadow: var(--shadow); }

/* ---------- messages ---------- */
.msg { font-size: 13px; margin-top: 12px; min-height: 18px; font-weight: 500; }
.msg.error { color: var(--error); }
.msg.ok { color: var(--success); }

/* ---------- grid ---------- */
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .grid.cols-2 { grid-template-columns: 1fr !important; } }

/* ---------- lecture list ---------- */
.lecture-list { display: grid; gap: 12px; }
.lecture-item {
  display: flex; align-items: center; gap: 16px; padding: 16px;
  background: var(--white); border: 1px solid var(--hairline); border-radius: var(--r-lg);
  cursor: pointer; transition: .15s;
}
.lecture-item:hover { border-color: var(--hairline-strong); box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.lecture-item .idx { width: 40px; height: 40px; flex: none; border-radius: var(--r-md);
  display: grid; place-items: center; font-weight: 700; font-size: 15px; color: var(--ink); }
/* 클레이 감성: 인덱스 칩 색을 순환 */
.lecture-item:nth-child(6n+1) .idx { background: #ffe0ec; }
.lecture-item:nth-child(6n+2) .idx { background: #e4f4ee; }
.lecture-item:nth-child(6n+3) .idx { background: #ece6fb; }
.lecture-item:nth-child(6n+4) .idx { background: #ffe9d8; }
.lecture-item:nth-child(6n+5) .idx { background: #fbf0cf; }
.lecture-item:nth-child(6n+6) .idx { background: #d9f0e7; }
.lecture-item .body { flex: 1; min-width: 0; }
.lecture-item .body .t { font-weight: 600; color: var(--ink); letter-spacing: -.01em; }
.lecture-item .body .d { color: var(--muted); font-size: 13px; margin-top: 1px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lecture-item .meta { text-align: right; min-width: 96px; }

/* ---------- badges ---------- */
.badge { display: inline-block; padding: 4px 11px; border-radius: var(--pill); font-size: 12px; font-weight: 600; }
.badge.done { background: var(--teal); color: #eafff6; }
.badge.prog { background: #ece6fb; color: #5a3aa8; }
.badge.none { background: var(--surface-card); color: var(--muted); }

/* ---------- progress bar ---------- */
.bar { height: 8px; border-radius: var(--pill); background: var(--surface-strong); overflow: hidden; margin-top: 8px; }
.bar > span { display: block; height: 100%; border-radius: var(--pill);
  background: linear-gradient(90deg, var(--pink), var(--lavender)); transition: width .25s; }
.bar.ok > span { background: linear-gradient(90deg, var(--teal), var(--mint)); }

/* ---------- table ---------- */
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { padding: 11px 12px; border-bottom: 1px solid var(--hairline); text-align: left; white-space: nowrap; }
th { color: var(--muted); font-weight: 600; position: sticky; top: 0; background: var(--surface-soft); z-index: 1; }
.table-scroll { overflow: auto; border: 1px solid var(--hairline); border-radius: var(--r-lg);
  max-height: 70vh; background: var(--white); }
td.num, th.num { text-align: center; }
tbody tr:hover td { background: #fdf6ea; }

/* dashboard pill cells */
.pill { font-size: 12px; padding: 2px 9px; border-radius: var(--r-sm); font-weight: 600; }
.pill.o { background: #d6f0e4; color: var(--teal); }
.pill.x { background: #f3eee2; color: var(--muted-soft); }

/* ---------- utility ---------- */
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.spacer { flex: 1; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.hidden { display: none !important; }

/* ---------- toast ---------- */
.toast { position: fixed; right: 18px; bottom: 18px; z-index: 50; display: flex; flex-direction: column; gap: 8px; }
.toast .t { background: var(--white); border: 1px solid var(--hairline-strong);
  padding: 12px 16px; border-radius: var(--r-md); box-shadow: var(--shadow-lift);
  font-size: 14px; font-weight: 500; color: var(--ink); max-width: 360px; }
.toast .t.ok { border-color: var(--mint); }
.toast .t.error { border-color: var(--error); }

/* ---------- player ---------- */
.player-wrap { background: #000; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--hairline-strong); }
video { width: 100%; display: block; max-height: 64vh; background: #000; }
.progress-readout { display: flex; gap: 18px; align-items: center; margin-top: 14px; flex-wrap: wrap; }
.progress-readout .big { font-size: 34px; font-weight: 700; letter-spacing: -.03em; color: var(--ink); line-height: 1; }

/* ---------- upload ---------- */
.uploadbox { border: 1.5px dashed var(--hairline-strong); border-radius: var(--r-md); padding: 22px;
  text-align: center; color: var(--muted); background: var(--surface-soft); }
.progress-line { height: 10px; background: var(--surface-strong); border-radius: var(--pill); overflow: hidden; margin-top: 10px; }
.progress-line > span { display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--pink), var(--lavender)); transition: width .2s; }

/* ---------- key-value ---------- */
.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; font-size: 14px; }
.kv .k { color: var(--muted); }