:root {
  --bg: #f6f7fb; --surface: #fff; --surface-2: #f1f3f8; --text: #1b2333; --muted: #5b6578; --line: #dde2ec;
  --nav: #141b2b; --nav-text: #e8ecf4; --accent: #2f6fde; --accent-soft: #e6eefc;
  --practice: #c2410c; --practice-soft: #fde9df;
  --yes: #1f8a4c; --yes-soft: #e3f4ea; --part: #b7791f; --part-soft: #fcf1dc;
  --no: #6b7486; --no-soft: #eceef3; --unseen: #8a5cc2; --unseen-soft: #f1eafb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141e; --surface: #171e2c; --surface-2: #1e2637; --text: #e6eaf2; --muted: #9aa4b8; --line: #2b3446;
    --nav: #0a0e16; --nav-text: #e6eaf2; --accent: #6c9ef5; --accent-soft: #1f2c47;
    --practice: #f08a5d; --practice-soft: #3a2418;
    --yes: #4cc185; --yes-soft: #16302a; --part: #e0a948; --part-soft: #33291a;
    --no: #9aa4b8; --no-soft: #232b3b; --unseen: #b48ef0; --unseen-soft: #2a2240;
  }
}

* { box-sizing: border-box; }
html { scroll-padding-top: 64px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }

/* thanh trên cùng */
.nav { position: sticky; top: 0; z-index: 10; background: var(--nav); }
.nav .wrap { display: flex; align-items: center; gap: 12px; height: 52px; }
.nav b { color: var(--nav-text); white-space: nowrap; }
.nav nav { display: flex; gap: 2px; margin-left: auto; overflow-x: auto; }
.nav nav a { color: var(--nav-text); text-decoration: none; padding: 6px 10px; border-radius: 7px; font-size: 14px; white-space: nowrap; opacity: .85; }
.nav nav a:hover { background: rgba(255, 255, 255, .1); opacity: 1; }

/* phần đầu */
.hero { display: grid; grid-template-columns: 1fr 330px; gap: 24px; padding: 28px 0 8px; align-items: start; }
.eyebrow { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
h1 { font-size: 34px; line-height: 1.2; margin: 6px 0 10px; }
.lead { color: var(--muted); font-size: 16px; margin: 0 0 8px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.rhythm { padding: 14px 18px; }
.rhythm h3 { margin: 0 0 6px; font-size: 15px; }
.rhythm table td { padding: 4px 0; border: 0; }
.rhythm table td:last-child { text-align: right; color: var(--muted); white-space: nowrap; }

section { padding: 26px 0 6px; }
h2 { font-size: 22px; margin: 0 0 4px; }
.sub { color: var(--muted); margin: 0 0 14px; }

/* lộ trình */
.phase-label { font-size: 13px; font-weight: 700; margin: 0 0 8px; }
.phase-label.learn { color: var(--accent); }
.phase-label.practice { color: var(--practice); }
.nodes { display: grid; gap: 12px; margin-bottom: 16px; }
.nodes.five { grid-template-columns: repeat(5, 1fr); }
.nodes.three { grid-template-columns: repeat(3, 1fr); }
.nodes.four { grid-template-columns: repeat(4, 1fr); }
td.extra { color: var(--muted); }
.node { display: block; padding: 12px 14px; text-decoration: none; color: inherit; border-left: 4px solid var(--accent); }
.node.practice { border-left-color: var(--practice); }
.node:hover { border-color: var(--accent); }
.node small { color: var(--muted); font-weight: 600; }
.node strong { display: block; margin: 2px 0 6px; line-height: 1.3; }
.chip { display: inline-block; font-size: 11.5px; background: var(--surface-2); border-radius: 99px; padding: 1px 8px; margin: 0 2px 4px 0; color: var(--muted); }

/* lịch từng tuần */
.week { margin-bottom: 14px; overflow: hidden; }
.week-head { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; padding: 14px 16px 4px; }
.badge { font-weight: 700; font-size: 13px; border-radius: 8px; padding: 3px 9px; background: var(--accent-soft); color: var(--accent); }
.week.practice .badge { background: var(--practice-soft); color: var(--practice); }
.week-head strong { font-size: 16px; }
.week-head span { color: var(--muted); font-size: 13px; }
.goal { color: var(--muted); font-size: 14px; margin: 0; padding: 0 16px 8px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 16px; border-top: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); background: var(--surface-2); }
td.day { white-space: nowrap; width: 120px; font-weight: 600; }
td.day small { display: block; color: var(--muted); font-weight: 400; }
td.min { white-space: nowrap; width: 60px; color: var(--muted); }
td p { margin: 0 0 4px; }
td p:last-child { margin: 0; }
.links { font-size: 13px; }
.links a { margin-right: 10px; }
.tag { font-size: 11px; font-weight: 700; border-radius: 5px; padding: 0 6px; margin-right: 4px; vertical-align: 1px; text-decoration: none; }
.tag.pre { background: var(--yes-soft); color: var(--yes); }
.tag.claude { background: var(--unseen-soft); color: var(--unseen); }
.tag.ddia { background: var(--part-soft); color: var(--part); }

/* trạng thái ở trang PRE */
.st { font-size: 12px; font-weight: 700; border-radius: 99px; padding: 2px 9px; white-space: nowrap; }
.st.yes { background: var(--yes-soft); color: var(--yes); }
.st.partial { background: var(--part-soft); color: var(--part); }
.st.no { background: var(--no-soft); color: var(--no); }
.st.unseen { background: var(--unseen-soft); color: var(--unseen); }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.box { padding: 16px 18px; }
.box h3 { margin: 0 0 6px; font-size: 16px; }
.box ul, .box ol { margin: 6px 0 0; padding-left: 20px; }
.note { font-size: 13px; color: var(--muted); }
footer { color: var(--muted); font-size: 13px; padding: 30px 0 40px; }

@media (max-width: 860px) {
  .hero, .grid2 { grid-template-columns: 1fr; }
  .nodes.five, .nodes.three, .nodes.four { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 28px; }
}
@media (max-width: 560px) {
  .nav b { display: none; }
  .nav nav { margin-left: 0; }
  .nodes.five, .nodes.three, .nodes.four { grid-template-columns: 1fr; }
  /* bảng thành dạng thẻ trên điện thoại */
  table.stack thead { display: none; }
  table.stack tr { display: block; border-top: 1px solid var(--line); padding: 8px 16px; }
  table.stack td { display: block; border: 0; padding: 2px 0; width: auto; }
  table.stack td.day small, table.stack td.min { display: inline; margin-left: 6px; }
}
@media print { .nav { display: none; } .week { break-inside: avoid; } }

/* mức độ quan trọng */
:root { --core: #c62828; --core-soft: #fde7e7; }
@media (prefers-color-scheme: dark) { :root { --core: #f07178; --core-soft: #3a1d22; } }
.pri { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 5px; padding: 0 6px; margin-right: 6px; vertical-align: 1px; white-space: nowrap; }
.pri.core { background: var(--core-soft); color: var(--core); }
.pri.know { background: var(--accent-soft); color: var(--accent); }
.pri.skim { background: var(--no-soft); color: var(--no); }

.legend { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.legend .box { padding: 12px 14px; }
.legend .box p { margin: 4px 0 0; font-size: 13px; color: var(--muted); }

/* ô tuần trong lộ trình */
.node small { display: flex; justify-content: space-between; }
.node ul { list-style: none; margin: 6px 0 8px; padding: 0; font-size: 13px; }
.node li { padding: 1px 0; }
.node li::before { display: inline-block; width: 16px; }
.node li.core { font-weight: 600; }
.node li.core::before { content: "★"; color: var(--core); }
.node li.know::before { content: "●"; color: var(--accent); font-size: 10px; }
.node li.skim { color: var(--muted); }
.node li.skim::before { content: "○"; color: var(--no); font-size: 10px; }
.node .out { font-size: 12.5px; color: var(--muted); margin: 0; line-height: 1.45; border-top: 1px dashed var(--line); padding-top: 6px; }
.count { font-size: 12px; font-weight: 700; color: var(--muted); }
.count.full { color: var(--yes); }

/* việc có ô tick */
.task { display: flex; gap: 8px; align-items: flex-start; margin: 0 0 6px; cursor: pointer; }
.task input { margin-top: 4px; width: 16px; height: 16px; accent-color: var(--yes); flex: none; }
.task.core > span { font-weight: 600; }
.task.done > span { color: var(--muted); text-decoration: line-through; font-weight: 400; }
.task + .links { margin: -4px 0 6px 24px; }

/* ghi chú từng tuần */
.notes { margin: 0 16px 12px; padding: 10px 14px; background: var(--surface-2); border-radius: 10px; font-size: 14px; }
.notes b { font-size: 13px; }
.notes ul { margin: 4px 0 6px; padding-left: 18px; }
.notes p { margin: 0; color: var(--muted); font-size: 13px; }

.progress { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 13.5px; }
.bar { height: 6px; background: var(--surface-2); border-radius: 99px; overflow: hidden; margin-top: 6px; }
.bar i { display: block; height: 100%; width: 0; background: var(--yes); }

@media (max-width: 860px) { .legend { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .legend { grid-template-columns: 1fr; } .notes { margin: 0 12px 12px; } }