/* ===== Khóa học Tử Vi — Hệ thống thiết kế dùng chung ===== */

:root {
  --bg: #f6f1e7;
  --bg-soft: #fbf7ef;
  --surface: #ffffff;
  --ink: #241c14;
  --ink-soft: #4a3d30;
  --muted: #7a6a58;
  --line: #e4d8c4;
  --primary: #6d1f2e;      /* burgundy */
  --primary-soft: #9c3446;
  --accent: #b8892b;       /* gold */
  --accent-soft: #d9b25a;
  --indigo: #26324f;
  --good: #2f6b4f;
  --bad: #a23a2e;
  --warn: #9a6b16;
  --shadow: 0 8px 30px rgba(43, 33, 25, 0.10);
  --radius: 14px;
  --maxw: 820px;
  --serif: Georgia, "Times New Roman", "Nimbus Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1712;
    --bg-soft: #211d17;
    --surface: #26221b;
    --ink: #ece3d4;
    --ink-soft: #c9bca8;
    --muted: #9c8d78;
    --line: #3a3227;
    --primary: #d98a98;
    --primary-soft: #e0a3ae;
    --accent: #d9b25a;
    --accent-soft: #e6c877;
    --indigo: #9fb0d6;
    --good: #7bc4a1;
    --bad: #e0897c;
    --warn: #d6b060;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.9;
  font-size: 20px;
  letter-spacing: 0.15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px 90px;
}

/* ===== Header / topbar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: .3px;
}
.brand .seal {
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  margin-right: 8px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  vertical-align: middle;
}
.topbar a.home { color: var(--muted); text-decoration: none; font-size: 14px; }
.topbar a.home:hover { color: var(--primary); }

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 64px 0 34px;
}
.hero .kicker {
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  margin: 12px 0 10px;
  color: var(--primary);
}
.hero p { color: var(--ink-soft); max-width: 620px; margin: 0 auto; font-size: 18px; }

/* ===== Lesson header ===== */
.lesson-head { padding: 46px 0 8px; border-bottom: 1px solid var(--line); margin-bottom: 34px; }
.lesson-head .tag {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: #fff; background: var(--accent); padding: 4px 12px; border-radius: 30px;
}
.lesson-head h1 {
  font-family: var(--serif);
  font-size: clamp(28px, 5vw, 42px);
  color: var(--primary);
  margin: 16px 0 6px;
  line-height: 1.15;
}
.lesson-head .lede { color: var(--ink-soft); font-size: 18px; margin: 0; }

/* ===== Typography ===== */
h2 {
  font-family: var(--serif);
  font-size: 27px;
  color: var(--indigo);
  margin: 46px 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-soft);
}
h3 { font-family: var(--serif); font-size: 21px; color: var(--primary); margin: 30px 0 8px; }
p { margin: 16px 0; }
a { color: var(--primary-soft); }
strong { color: var(--ink); }
em { color: var(--ink-soft); }
ul, ol { padding-left: 24px; }
li { margin: 10px 0; }

.hanviet { color: var(--primary); font-weight: 600; }

/* ===== Callouts ===== */
.note, .tip, .warn, .key {
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 22px 0;
  border: 1px solid var(--line);
  background: var(--surface);
}
.note  { border-left: 5px solid var(--indigo); }
.tip   { border-left: 5px solid var(--good); }
.warn  { border-left: 5px solid var(--warn); }
.key   { border-left: 5px solid var(--accent); background: var(--bg-soft); }
.note .h, .tip .h, .warn .h, .key .h {
  font-weight: 700; display: block; margin-bottom: 4px; font-size: 14px;
  text-transform: uppercase; letter-spacing: 1px;
}
.note .h { color: var(--indigo); }
.tip .h  { color: var(--good); }
.warn .h { color: var(--warn); }
.key .h  { color: var(--accent); }

/* ===== Cards ===== */
.grid { display: grid; gap: 16px; margin: 24px 0; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }

/* ===== Lesson list (index) ===== */
.toc { display: grid; gap: 14px; margin: 30px 0; }
.toc-item {
  display: flex; align-items: center; gap: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
}
.toc-item:hover { transform: translateY(-2px); border-color: var(--accent); }
.toc-num {
  flex: none;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--primary); color: #fff;
  font-family: var(--serif); font-size: 20px; font-weight: 700;
}
.toc-body h3 { margin: 0 0 2px; color: var(--primary); font-size: 19px; }
.toc-body p  { margin: 0; color: var(--muted); font-size: 15px; }

/* ===== Tables ===== */
.table-scroll { overflow-x: auto; margin: 22px 0; border-radius: var(--radius); border: 1px solid var(--line); }
table { border-collapse: collapse; width: 100%; font-size: 15.5px; background: var(--surface); }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-soft); color: var(--indigo); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
td .good { color: var(--good); font-weight: 600; }
td .bad  { color: var(--bad); font-weight: 600; }

/* ===== Pills ===== */
.pill {
  display: inline-block; font-size: 13px; font-weight: 600;
  padding: 2px 10px; border-radius: 20px; margin: 2px 3px 2px 0;
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--ink-soft);
}
.pill.good { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, var(--line)); }
.pill.bad  { color: var(--bad);  border-color: color-mix(in srgb, var(--bad) 40%, var(--line)); }
.pill.gold { color: var(--accent); border-color: var(--accent-soft); }

/* ===== Quote / mnemonic ===== */
.saying {
  font-family: var(--serif);
  font-size: 21px;
  font-style: italic;
  color: var(--primary);
  text-align: center;
  margin: 30px auto;
  max-width: 620px;
  padding: 14px 0;
  border-top: 1px solid var(--accent-soft);
  border-bottom: 1px solid var(--accent-soft);
}

/* ===== 12-cung diagram ===== */
.cung-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 24px 0;
}
.cung-cell {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  min-height: 76px;
  font-size: 13.5px;
}
.cung-cell .chi { color: var(--muted); font-size: 12px; font-weight: 700; }
.cung-cell .name { color: var(--primary); font-weight: 700; font-family: var(--serif); font-size: 15px; }
.cung-center {
  grid-column: 2 / 4; grid-row: 2 / 4;
  display: grid; place-items: center; text-align: center;
  background: var(--primary); color: #fff; border-radius: 10px; padding: 14px;
}
.cung-center .name { color: var(--accent-soft); font-family: var(--serif); font-size: 18px; }

/* ===== Steps ===== */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 24px 0; }
.steps li {
  position: relative; padding: 4px 0 18px 52px; margin: 0;
  border-left: 2px solid var(--line); margin-left: 16px;
}
.steps li:last-child { border-left-color: transparent; }
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: -16px; top: 0;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: grid; place-items: center; font-weight: 700; font-family: var(--serif);
}
.steps li strong { display: block; color: var(--primary); }

/* ===== Nav between lessons ===== */
.lesson-nav {
  display: flex; justify-content: space-between; gap: 14px;
  margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--line);
}
.lesson-nav a {
  flex: 1; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 18px; transition: border-color .15s ease;
}
.lesson-nav a:hover { border-color: var(--accent); }
.lesson-nav .dir { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.lesson-nav .ttl { color: var(--primary); font-weight: 700; }
.lesson-nav a.next { text-align: right; }
.lesson-nav a.disabled { opacity: .4; pointer-events: none; }

/* ===== Checklist ===== */
.check { list-style: none; padding: 0; }
.check li { padding-left: 30px; position: relative; }
.check li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--good); font-weight: 700;
}

/* ===== Footer ===== */
footer {
  text-align: center; color: var(--muted); font-size: 14px;
  padding: 40px 20px; border-top: 1px solid var(--line); margin-top: 40px;
}

/* ===== Progress dots (index) ===== */
.meta-row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 20px 0 8px; color: var(--muted); font-size: 14px; }
.meta-row span { display: inline-flex; align-items: center; gap: 6px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .cung-grid { grid-template-columns: repeat(2, 1fr); }
  .cung-center { grid-column: auto; grid-row: auto; }
  .lesson-nav { flex-direction: column; }
}