:root {
  color-scheme: light;
  --ink: #173654;
  --secondary: #52677f;
  --muted: #708096;
  --accent: #2664d8;
  --blue: #f1f6fd;
  --blue-strong: #eaf2ff;
  --line: #e6edf5;
  --radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: #f0f4fa;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body { margin: 0; padding: 20px; height: 100dvh; overflow: hidden; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
button, a { touch-action: manipulation; }
button:focus-visible, a:focus-visible { outline: 3px solid #7ea9f7; outline-offset: 4px; }
button:disabled { cursor: default; opacity: .38; }
button svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.app-shell { max-width: 1640px; height: 100%; margin: 0 auto; background: #fff; border-radius: 20px; box-shadow: 0 4px 32px #233d6110; display: flex; flex-direction: column; overflow: hidden; }
.app-header { height: 78px; flex-shrink: 0; display: flex; align-items: center; justify-content: space-between; padding: 0 32px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; gap: 23px; align-items: center; font-size: 29px; letter-spacing: -1.5px; font-weight: 750; }
.brand span { font-size: 16px; font-weight: 550; letter-spacing: .2px; color: var(--secondary); }
.button { min-height: 38px; border: 1px solid #dce6f5; background: #f5f8fd; color: var(--ink); border-radius: 9px; padding: 8px 13px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-size: 13px; font-weight: 550; transition: background .15s, border-color .15s; }
.home-link { white-space: nowrap; }
.button:hover:not(:disabled) { background: #eaf2ff; border-color: #bdcff0; }
.button.quiet { background: #fff; border-color: transparent; }
.button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.button.primary:hover { background: #1c53ba; border-color: #1c53ba; }
.workspace { display: flex; flex: 1; min-height: 0; }
.sidebar { width: 228px; flex-shrink: 0; padding: 32px 16px 24px 20px; display: flex; flex-direction: column; justify-content: space-between; gap: 28px; }
#navigation { display: flex; flex-direction: column; gap: 7px; }
.nav-link { display: flex; align-items: center; gap: 14px; min-height: 45px; padding: 12px 15px; border-radius: 9px; color: var(--secondary); font-size: 14px; line-height: 1.4; transition: background .15s; }
.nav-link:hover { background: #f5f8fc; }
.nav-link[aria-current="page"] { background: var(--blue-strong); color: #245ec4; font-weight: 600; }
.nav-number { width: 21px; font-size: 12px; font-variant-numeric: tabular-nums; color: var(--muted); }
.nav-link[aria-current="page"] .nav-number { color: var(--accent); }
.nav-label { margin: 19px 15px 6px; color: var(--muted); font-size: 11px; letter-spacing: 1px; }
.sidebar-note { padding: 0 15px; font-size: 11px; line-height: 1.8; color: var(--muted); }
.sidebar-note > span { color: var(--secondary); font-weight: 600; font-size: 12px; }
.sidebar-note p { margin: 6px 0 16px; }
.sidebar-note time { font-variant-numeric: tabular-nums; }
.reading-area { display: flex; flex-direction: column; min-width: 0; flex: 1; }
#content { flex: 1; overflow-y: auto; overscroll-behavior: contain; padding: 34px clamp(28px, 4vw, 64px) 36px; outline: none; scrollbar-gutter: stable; }
.page { max-width: 1090px; margin: 0 auto; animation: arrive .22s ease-out; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(26px, 2.3vw, 35px); line-height: 1.4; letter-spacing: -.7px; font-weight: 650; }
.intro { color: var(--secondary); font-size: 14px; line-height: 1.85; margin-top: 12px; max-width: 800px; }
.section-heading { font-size: 15px; font-weight: 650; line-height: 1.6; }
.section-heading-row { display: flex; gap: 18px; align-items: center; justify-content: space-between; margin-bottom: 17px; }
.section-note { color: var(--muted); font-size: 12px; line-height: 1.7; }
.milestone { margin-top: 26px; padding: 25px 30px; border-radius: var(--radius); background: var(--blue); display: flex; align-items: center; gap: 36px; }
.milestone-copy { flex: 1; min-width: 0; }
.milestone h2 { font-size: 18px; font-weight: 650; margin-bottom: 13px; }
.journey { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; color: #32597f; font-size: 13px; line-height: 1.7; }
.journey svg { width: 15px; height: 15px; fill: none; stroke: #8aa5c3; stroke-width: 1.5; flex-shrink: 0; }
.date-display { text-align: right; flex-shrink: 0; }
.date-display strong { display: block; color: var(--accent); font-size: 41px; letter-spacing: -1.5px; line-height: 1.15; font-weight: 600; font-variant-numeric: tabular-nums; }
.date-display span { display: block; margin-top: 8px; color: var(--secondary); font-size: 11px; }
.overview-plans { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); column-gap: 64px; row-gap: 44px; align-items: start; margin-top: 36px; }
.roadmap { min-width: 0; }
.timeline-head, .timeline-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2.25fr); align-items: center; column-gap: 20px; }
.timeline-head { padding: 0 18px 8px; color: var(--muted); font-size: 11px; }
.timeline-months { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); color: var(--muted); }
.timeline-months span { padding-left: 8px; border-left: 1px solid #e8eef6; }
.delivery-timeline { display: grid; gap: 4px; }
.timeline-row { background: #f7f9fd; width: 100%; color: var(--ink); padding: 7px 18px; min-height: 48px; text-align: left; border: 0; border-radius: 9px; transition: background .15s; }
.timeline-row:hover { background: var(--blue-strong); }
.timeline-name { display: flex; align-items: center; gap: 12px; }
.timeline-name strong { font-size: 14px; font-weight: 600; }
.timeline-name svg { width: 15px; height: 15px; color: #7c96b5; }
.timeline-track { position: relative; min-width: 0; height: 34px; display: flex; align-items: center; }
.timeline-month-grid { position: absolute; inset: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); pointer-events: none; }
.timeline-month-grid i { border-left: 1px solid #e8eef6; }
.timeline-month-grid i:last-child { border-right: 1px solid #e8eef6; }
.timeline-bar { position: absolute; left: var(--timeline-start); top: 21px; width: var(--timeline-width); height: 8px; border-radius: 999px; background: #d8e5f8; }
.timeline-row[data-go="release"] .timeline-bar { background: #bcd3f6; }
.timeline-row[data-go="push"] .timeline-bar { background: #a8c6f5; }
.timeline-row[data-go="promotion"] .timeline-bar { background: #7da8ef; }
.timeline-range { position: absolute; z-index: 1; left: var(--timeline-range-start); top: 0; padding: 0; font-size: 10.5px; line-height: 1.5; color: var(--secondary); font-variant-numeric: tabular-nums; white-space: nowrap; }
.timeline-range .timeline-period-end { color: var(--accent); font-weight: 600; }
.timeline-period { font-size: 13px; line-height: 1.75; color: var(--secondary); font-weight: 400; font-variant-numeric: tabular-nums; }
.timeline-period-end { color: var(--accent); font-weight: 600; }
.timeline-period small { display: block; font-size: 10px; color: var(--muted); }
.timeline-caption { margin-top: 12px; font-size: 11px; color: var(--muted); line-height: 1.8; }
.release-window { min-width: 0; }
.release-window h2 { display: flex; align-items: center; min-height: 38px; margin-bottom: 17px; color: var(--secondary); font-size: 14px; line-height: 1.7; font-weight: 550; }
.release-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.release-list li { display: grid; grid-template-columns: minmax(0,1fr); gap: 3px; }
.release-window time { color: var(--secondary); font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums; line-height: 1.8; }
.release-window .release-target time { color: var(--accent); font-weight: 650; }
.release-window span { font-size: 12px; color: var(--secondary); line-height: 1.8; }
.mainline { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); column-gap: 28px; }
.route-step { display: block; text-align: left; width: 100%; padding: 14px 0 15px; background: none; color: var(--ink); border: 0; border-top: 2px solid #c3d6f4; position: relative; }
.route-step::before { content: ""; position: absolute; width: 8px; height: 8px; background: #85a9e5; border: 3px solid white; box-sizing: content-box; border-radius: 50%; top: -8px; left: 0; }
.route-step:first-child { border-color: var(--accent); }
.route-step:first-child::before { background: var(--accent); }
.route-label { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.route-label strong { font-size: 15px; font-weight: 600; }
.route-label svg { width: 17px; height: 17px; color: var(--muted); transition: transform .18s; }
.route-step:hover .route-label svg, .parallel-link:hover svg { transform: translateX(3px); color: var(--accent); }
.route-step p { font-size: 12px; color: var(--secondary); line-height: 1.85; margin-top: 9px; }
.route-step time { display: block; color: var(--muted); font-size: 11px; margin-top: 9px; }
.parallel-work { margin-top: 18px; background: #f7f9fc; border-radius: var(--radius); padding: 18px 22px; }
.parallel-work .section-heading-row { margin-bottom: 12px; }
.parallel-links { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 25px; }
.parallel-link { background: transparent; text-align: left; border: 0; color: var(--ink); padding: 5px 0; }
.parallel-link strong { font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 9px; }
.parallel-link strong svg { width: 16px; height: 16px; color: var(--muted); transition: transform .18s; }
.parallel-link p { margin-top: 5px; font-size: 12px; line-height: 1.8; color: var(--secondary); }
.overview-end { display: flex; gap: 18px; align-items: center; justify-content: space-between; margin-top: 22px; }
.overview-end p { color: var(--secondary); font-size: 12px; line-height: 1.8; }
.title-row { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 10px 24px; }
.stage-index { font-size: 13px; color: #88a0bd; margin-bottom: 8px; font-variant-numeric: tabular-nums; }
.stage-period { margin-left: auto; color: #225bbf; font-size: clamp(22px, 2vw, 28px); line-height: 1.5; font-weight: 650; letter-spacing: 0; white-space: nowrap; font-variant-numeric: proportional-nums; text-autospace: no-autospace; }
.goal-block { background: var(--blue); padding: 18px 24px; margin: 32px 0 0; border-radius: var(--radius); }
.goal-block h2 { font-size: 12px; color: #486c98; font-weight: 550; margin-bottom: 7px; }
.goal-block p { font-size: 16px; line-height: 1.85; font-weight: 500; }
.feature-list { display: grid; gap: 20px; }
.feature { display: block; }
.feature h3 { font-size: 14px; font-weight: 550; line-height: 1.85; display: flex; align-items: baseline; gap: 12px; padding: 3px 0; }
.feature h3 .feature-number { flex: 0 0 20px; }
.feature-number { font-size: 11px; color: #8c9db1; font-weight: 500; font-variant-numeric: tabular-nums; }
.feature p { font-size: 13px; line-height: 1.9; color: var(--secondary); }
.feature-section > .section-heading-row { justify-content: flex-start; gap: 16px; margin-bottom: 12px; }
.feature-section > .detail-button { margin-top: 20px; }
.detail-button { color: var(--accent); font-size: 12px; }
.stage-lower { display: grid; grid-template-columns: minmax(240px, .8fr) minmax(0, 1.2fr); gap: clamp(28px, 4vw, 56px); align-items: start; margin-top: 40px; }
.stage-lower .schedule, .stage-lower .dependency-note { margin-top: 0; }
.schedule { margin-top: 28px; }
.schedule > .section-heading-row { justify-content: flex-start; align-items: baseline; gap: 16px; margin-bottom: 12px; }
.schedule > .section-heading-row .section-heading { color: var(--secondary); font-size: 14px; font-weight: 550; }
.schedule > .section-heading-row .section-note { color: #93a1b1; }
.schedule-grid { display: grid; grid-template-columns: minmax(0,1fr); gap: 0; padding: 8px 24px; border: 1px solid #f0f3f7; border-radius: var(--radius); background: #fafbfd; }
.schedule-item { display: grid; grid-template-columns: 170px minmax(0,1fr); align-items: baseline; column-gap: 24px; row-gap: 4px; padding: 12px 0; }
.schedule-item time { grid-column: 1; grid-row: 1 / 3; font-size: 11px; line-height: 1.8; color: #6e8bab; font-variant-numeric: tabular-nums; }
.schedule-item h3 { grid-column: 2; font-size: 13px; line-height: 1.7; font-weight: 550; color: var(--secondary); }
.schedule-item p { grid-column: 2; font-size: 11px; line-height: 1.8; color: var(--muted); }
.dependency-note { margin-top: 28px; padding: 19px 23px; background: var(--blue); border-radius: var(--radius); font-size: 13px; line-height: 1.9; }
.dependency-note h2 { font-size: 13px; font-weight: 650; margin-bottom: 7px; }
.dependency-note p + p { margin-top: 7px; color: #47617e; }
.page-controls { min-height: 65px; flex-shrink: 0; padding: 10px clamp(28px, 4vw, 64px); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.page-position { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.page-buttons { display: flex; gap: 7px; }
.keyboard-hint { display: none; font-size: 11px; color: var(--muted); }
dialog { width: min(640px, calc(100% - 32px)); max-height: calc(100dvh - 64px); border: 0; border-radius: 20px; padding: 30px 34px 34px; color: var(--ink); box-shadow: 0 22px 90px #16365725; }
dialog::backdrop { background: #15335455; backdrop-filter: blur(4px); }
.dialog-top { display: flex; gap: 20px; align-items: center; justify-content: space-between; margin-bottom: 25px; }
.dialog-top h2 { font-size: 21px; font-weight: 650; }
.icon-button { display: grid; place-items: center; border: 0; background: #f0f5fb; color: var(--secondary); border-radius: 50%; width: 34px; height: 34px; flex-shrink: 0; }
.dialog-section + .dialog-section { margin-top: 26px; }
.dialog-section h3 { font-size: 14px; margin-bottom: 11px; font-weight: 650; }
.dialog-section p, .dialog-section li { font-size: 14px; line-height: 1.9; color: var(--secondary); }
.dialog-section .source-links { margin-top: 10px; font-size: 12px; }
.source-links a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.dialog-section ol { margin: 0; padding-left: 22px; display: grid; gap: 10px; }
.dialog-section:last-child { padding: 19px 22px; background: var(--blue); border-radius: 12px; }
.skip-link { position: fixed; top: -100px; left: 25px; z-index: 10; background: var(--ink); color: #fff; padding: 10px 20px; border-radius: 8px; }
.skip-link:focus { top: 20px; }
@keyframes arrive { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
@media (min-width: 1500px) { .intro { font-size: 15px; } .feature p { font-size: 14px; } }
@media (max-height: 760px) and (min-width: 781px) { body { padding: 14px; } .app-header { height: 65px; } #content { padding-top: 25px; } .sidebar { padding-top: 24px; } .sidebar-note p { margin-bottom: 6px; } .nav-link { min-height: 40px; padding-top: 10px; padding-bottom: 10px; } }
@media (max-width: 1180px) { .overview-plans { grid-template-columns: minmax(0,1fr); gap: 42px; } .release-list li { grid-template-columns: 180px minmax(0,1fr); column-gap: 20px; } }
@media (max-width: 1080px) { .sidebar { width: 197px; padding-left: 12px; } #content { padding-left: 28px; padding-right: 28px; } .mainline { gap: 18px; } .stage-lower { grid-template-columns: minmax(220px, .9fr) minmax(0, 1.1fr); gap: 28px; } .schedule-item { grid-template-columns: 155px minmax(0,1fr); column-gap: 20px; } .parallel-links { gap: 18px; } .milestone { gap: 20px; padding: 23px; } }
@media (max-width: 780px) {
  body { padding: 0; }
  .app-shell { border-radius: 0; box-shadow: none; }
  .app-header { height: 65px; padding: 0 20px; }
  .brand { flex-direction: column; align-items: flex-start; font-size: 22px; line-height: 1.2; letter-spacing: -.6px; gap: 2px; white-space: nowrap; }
  .brand span { font-size: 11px; }
  .workspace { flex-direction: column; }
  .sidebar { width: 100%; padding: 12px 18px; flex-shrink: 0; }
  #navigation { flex-direction: row; overflow-x: auto; gap: 6px; scrollbar-width: none; }
  .nav-link { white-space: nowrap; padding: 10px 12px; min-height: 37px; font-size: 12px; gap: 7px; }
  .nav-number, .nav-label, .sidebar-note { display: none; }
  .reading-area { min-height: 0; }
  #content { padding: 22px 22px 28px; scrollbar-gutter: auto; }
  h1 { font-size: 27px; letter-spacing: -.5px; }
  .intro { font-size: 13px; }
  .milestone { margin-top: 22px; padding: 22px; flex-direction: column; align-items: stretch; gap: 20px; }
  .milestone h2 { font-size: 17px; }
  .date-display { text-align: left; display: flex; align-items: center; gap: 16px; }
  .date-display strong { font-size: 32px; }
  .date-display span { margin: 0; font-size: 11px; }
  .journey { gap: 7px; font-size: 12px; }
  .section-heading-row { align-items: flex-start; gap: 12px; }
  .section-note { font-size: 11px; }
  .mainline { grid-template-columns: 1fr; gap: 16px; padding-left: 6px; }
  .route-step { border-top: 0; border-left: 2px solid #c3d6f4; padding: 0 0 0 23px; }
  .route-step::before { top: 1px; left: -8px; }
  .route-step p { margin-top: 6px; }
  .route-step time { margin-top: 4px; }
  .parallel-work { padding: 20px; margin-top: 26px; }
  .parallel-work .section-heading-row { flex-direction: column; gap: 3px; }
  .parallel-links { grid-template-columns: 1fr; gap: 15px; }
  .overview-end { align-items: flex-start; flex-direction: column; gap: 14px; }
  .title-row { gap: 8px 20px; }
  .overview-plans { margin-top: 30px; }
  .timeline-head, .timeline-row { grid-template-columns: 130px minmax(560px, 1fr); column-gap: 12px; }
  .timeline-head { padding: 0 12px 8px; min-width: 702px; }
  .timeline-row { padding: 15px 12px; min-width: 702px; }
  .timeline-track { height: 40px; }
  .timeline-bar { top: 24px; height: 10px; }
  .timeline-range { font-size: 11px; }
  .roadmap { overflow-x: auto; padding-bottom: 4px; }
  .timeline-name { gap: 6px; }
  .timeline-name strong { font-size: 12px; }
  .timeline-name svg { display: none; }
  .timeline-period { font-size: 11px; }
  .delivery-timeline { gap: 9px; }
  .release-list { gap: 12px; }
  .release-list li { grid-template-columns: minmax(0,1.05fr) minmax(0,1fr); column-gap: 16px; }
  .stage-period { font-size: clamp(18px, 5.2vw, 22px); }
  .stage-index { margin-bottom: 5px; }
  .goal-block { padding: 18px 20px; margin: 28px 0 0; }
  .goal-block p { font-size: 15px; }
  .stage-lower { display: block; margin-top: 30px; }
  .feature-list { gap: 16px; }
  .feature p { padding-left: 28px; }
  .detail-button { min-height: 34px; padding: 6px 9px; font-size: 11px; gap: 5px; }
  .detail-button svg { width: 14px; }
  .schedule > .section-heading-row { flex-wrap: wrap; gap: 4px 12px; }
  .stage-lower .schedule { margin-top: 30px; }
  .schedule-grid { padding: 6px 20px; }
  .schedule-item { grid-template-columns: minmax(0,1fr); padding: 14px 0; row-gap: 5px; }
  .schedule-item time, .schedule-item h3, .schedule-item p { grid-column: 1; grid-row: auto; }
  .dependency-note { padding: 19px 21px; }
  .page-controls { min-height: 64px; padding: 10px 20px max(10px,env(safe-area-inset-bottom)); gap: 10px; }
  .page-position { font-size: 10px; }
  .page-buttons { gap: 2px; }
  .page-buttons .button { padding: 8px 9px; font-size: 12px; }
  dialog { padding: 23px; max-height: calc(100dvh - 32px); }
  .dialog-top h2 { font-size: 19px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }