:root {
  --ink: #17211d;
  --ink-2: #29352f;
  --muted: #68736d;
  --paper: #f5f2e9;
  --paper-2: #ebe7dc;
  --white: #fffef9;
  --acid: #d9f36a;
  --acid-dark: #b7d43f;
  --orange: #f26b3a;
  --blue: #406e8e;
  --red: #c94f45;
  --line: rgba(23, 33, 29, 0.14);
  --shadow: 0 24px 70px rgba(29, 38, 33, 0.12);
  --radius: 22px;
  --shell: min(1180px, calc(100vw - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .25;
  z-index: 20;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E");
}
button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
svg { width: 1.1em; height: 1.1em; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.section-shell { width: var(--shell); margin-inline: auto; }
#app:focus { outline: none; }
.page { display: none; min-height: 72vh; }
.page.active { display: block; animation: page-in .32s ease both; }
@keyframes page-in { from { opacity: 0; transform: translateY(5px); } }

.site-header {
  width: 100%; height: 82px; padding: 0 max(24px, calc((100vw - 1180px) / 2));
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line); background: rgba(245,242,233,.92);
  backdrop-filter: blur(16px); position: sticky; top: 0; z-index: 15;
}
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { position: relative; width: 38px; height: 38px; display: inline-block; }
.brand-mark span { position: absolute; left: 50%; bottom: 5px; border: 2px solid var(--ink); border-bottom: 0; border-radius: 50% 50% 0 0; transform: translateX(-50%); }
.brand-mark span:nth-child(1) { width: 8px; height: 8px; background: var(--ink); border-radius: 50%; border: 0; bottom: 3px; }
.brand-mark span:nth-child(2) { width: 23px; height: 16px; }
.brand-mark span:nth-child(3) { width: 36px; height: 27px; }
.brand-copy { display: flex; flex-direction: column; line-height: 1; }
.brand-copy strong { font-size: 18px; letter-spacing: .08em; }
.brand-copy small { font: 700 9px/1.4 ui-monospace, SFMono-Regular, monospace; color: var(--muted); letter-spacing: .23em; margin-top: 5px; }
.desktop-nav { display: flex; height: 100%; gap: 36px; }
.desktop-nav a { position: relative; display: grid; place-items: center; font-weight: 650; font-size: 14px; color: var(--muted); }
.desktop-nav a::after { content: ""; position: absolute; bottom: -1px; left: 50%; right: 50%; height: 3px; background: var(--ink); transition: .2s ease; }
.desktop-nav a:hover, .desktop-nav a.active { color: var(--ink); }
.desktop-nav a.active::after { left: 0; right: 0; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.edition-pill { border: 1px solid var(--line); border-radius: 99px; padding: 8px 12px; font: 700 11px ui-monospace, SFMono-Regular, monospace; letter-spacing: .08em; background: var(--white); }
.edition-pill i, .eyebrow i { display: inline-block; width: 7px; height: 7px; background: var(--orange); border-radius: 50%; margin-right: 6px; box-shadow: 0 0 0 4px rgba(242,107,58,.13); }
.icon-button { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--line); background: var(--white); border-radius: 50%; cursor: pointer; }
.menu-button { display: none; }

.hero { min-height: 620px; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 70px; padding-block: 72px; }
.eyebrow, .kicker { color: #57625c; font: 750 11px/1 ui-monospace, SFMono-Regular, monospace; letter-spacing: .17em; text-transform: uppercase; }
.hero h1 { max-width: 690px; font-size: clamp(48px, 6.5vw, 82px); line-height: 1.07; letter-spacing: -.055em; margin: 22px 0; font-weight: 760; }
.hero h1 em { font-family: Georgia, "Songti SC", serif; font-weight: 500; color: var(--blue); }
.hero-copy > p { max-width: 600px; font-size: 18px; line-height: 1.9; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; margin-top: 32px; }
.button { min-height: 48px; border-radius: 99px; padding: 0 22px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; border: 1px solid var(--line); cursor: pointer; font-size: 14px; font-weight: 750; transition: transform .18s ease, background .18s ease, box-shadow .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--ink); background: var(--acid); border-color: var(--ink); box-shadow: 4px 4px 0 var(--ink); }
.button-primary:hover { background: #e4fa86; box-shadow: 2px 2px 0 var(--ink); }
.button-ghost { background: transparent; }
.button-ghost:hover { background: var(--white); }
.button-dark { background: var(--ink); color: var(--white); border-color: var(--ink); }
.button-danger { background: #fff5f2; color: var(--red); border-color: rgba(201,79,69,.3); }
.button-wide { width: 100%; }
.hero-proof { margin-top: 29px; display: flex; flex-wrap: wrap; gap: 21px; color: var(--muted); font-size: 12px; font-weight: 650; }
.hero-proof span { display: flex; align-items: center; gap: 6px; }
.hero-proof svg { color: #547c48; }

.radio-stage { position: relative; min-height: 440px; display: grid; place-items: center; }
.air-rings { position: absolute; width: 450px; height: 450px; border: 1px solid rgba(64,110,142,.17); border-radius: 50%; }
.ring-one { animation: pulse-ring 3.5s ease-out infinite; }
.ring-two { width: 360px; height: 360px; animation: pulse-ring 3.5s 1.2s ease-out infinite; }
@keyframes pulse-ring { 0% { transform: scale(.75); opacity: .1; } 45% { opacity: 1; } 100% { transform: scale(1.22); opacity: 0; } }
.radio-card { position: relative; z-index: 2; width: min(100%, 430px); padding: 22px; border-radius: 25px; background: #28312e; border: 2px solid #101714; box-shadow: 13px 16px 0 rgba(64,110,142,.17), var(--shadow); transform: rotate(1.5deg); }
.radio-top { display: flex; justify-content: space-between; align-items: center; color: #aeb8b3; font: 650 9px ui-monospace, monospace; letter-spacing: .15em; padding-bottom: 13px; }
.on-air { color: var(--acid); }.on-air i { display: inline-block; width: 6px; height: 6px; background: var(--acid); border-radius: 50%; box-shadow: 0 0 8px var(--acid); }
.radio-display { background: #b8d487; border: 7px solid #151c19; border-radius: 8px; padding: 12px 15px 10px; box-shadow: inset 0 0 25px rgba(41,53,47,.25); color: #17211d; }
.display-label { display: flex; justify-content: space-between; font: 800 9px ui-monospace, monospace; }
.radio-display strong { display: block; font: 500 59px/1.05 "Courier New", monospace; letter-spacing: -.08em; text-align: center; }
.radio-display strong small { font-size: 34px; }
.meter { display: flex; align-items: end; height: 15px; gap: 3px; font: 700 8px monospace; }
.meter i { display: block; width: 10%; height: 4px; background: #24322a; }
.meter i:nth-last-child(-n+3) { height: 7px; background: #a44233; }
.radio-controls { display: flex; align-items: center; gap: 9px; padding-top: 20px; }
.speaker-grid { width: 100px; height: 60px; margin-right: auto; background: radial-gradient(circle, #101714 0 2px, transparent 2.5px) 0 0/13px 13px; opacity: .8; }
.control-label { color: #9eaaa4; font: 650 7px monospace; align-self: end; margin-bottom: 1px; }
.small-knob, .main-knob { position: relative; border-radius: 50%; background: repeating-conic-gradient(#141b18 0 7deg,#39433f 7deg 14deg); box-shadow: 0 5px 8px #101412; }
.small-knob { width: 42px; height: 42px; }
.main-knob { width: 75px; height: 75px; margin-left: 5px; }
.main-knob span { position: absolute; width: 2px; height: 23px; top: 7px; left: calc(50% - 1px); background: var(--acid); }
.radio-footer { display: flex; justify-content: flex-end; gap: 8px; color: #a6b0ab; font: 650 7px monospace; margin-top: 12px; }
.radio-footer span { padding: 5px 9px; border-radius: 3px; background: #171e1b; }
.frequency-note { position: absolute; z-index: 3; left: -4px; bottom: 24px; background: var(--white); border: 1px solid var(--ink); border-radius: 14px; padding: 11px 14px; display: grid; grid-template-columns: auto auto; gap: 1px 8px; box-shadow: 4px 4px 0 var(--ink); transform: rotate(-3deg); }
.frequency-note svg { grid-row: 1 / 3; align-self: center; color: var(--orange); }
.frequency-note span { font-size: 10px; color: var(--muted); }.frequency-note strong { font: 750 12px monospace; }

.quick-stats { display: grid; grid-template-columns: repeat(4,1fr); background: var(--ink); color: var(--white); border-radius: var(--radius); margin-bottom: 105px; overflow: hidden; }
.quick-stats div { padding: 26px 32px; border-right: 1px solid rgba(255,255,255,.12); }
.quick-stats div:last-child { border: 0; }
.quick-stats strong { display: block; font-size: 30px; font-weight: 680; letter-spacing: -.03em; }
.quick-stats span { color: #a7b2ac; font-size: 11px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 38px; }
.section-heading h2, .question-band h2, .panel-heading h2, .category-panel h2 { font-size: clamp(30px,4vw,48px); letter-spacing: -.045em; margin: 10px 0 0; line-height: 1.15; }
.text-link { display: inline-flex; gap: 5px; align-items: center; background: none; border: 0; border-bottom: 1px solid var(--ink); padding: 7px 0; font-size: 13px; font-weight: 750; cursor: pointer; }
.path-layout { display: grid; grid-template-columns: 1.5fr .72fr; gap: 24px; }
.path-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.path-item { position: relative; min-height: 116px; background: var(--white); display: grid; grid-template-columns: 58px 1fr auto; align-items: center; gap: 18px; padding: 22px 25px; border: 0; text-align: left; cursor: pointer; transition: .2s; }
.path-item:hover { background: #f0f4dc; padding-left: 29px; }
.path-number { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; border: 1px solid var(--line); font: 700 12px monospace; }
.path-item h3 { font-size: 19px; margin: 0 0 7px; }.path-item p { color: var(--muted); margin: 0; font-size: 13px; }.path-item svg { color: var(--muted); }
.path-item.done .path-number { background: var(--ink); color: var(--acid); }.path-item.done::after { content: "已完成"; position: absolute; right: 50px; top: 22px; font: 700 9px monospace; color: #5b784f; }
.daily-card { border-radius: var(--radius); background: var(--blue); color: var(--white); padding: 28px; display: flex; flex-direction: column; align-items: stretch; }
.daily-top { display: flex; justify-content: space-between; font: 700 10px monospace; color: #d9e8f0; letter-spacing: .08em; }
.daily-dial { width: 160px; height: 160px; margin: 28px auto 24px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--acid) var(--progress,0%), rgba(255,255,255,.12) 0); position: relative; }
.daily-dial::before { content: ""; position: absolute; inset: 9px; background: var(--blue); border-radius: 50%; }
.daily-dial div { z-index: 1; text-align: center; }.daily-dial strong { display: block; font-size: 32px; }.daily-dial span { color: #d9e8f0; font-size: 10px; }
.daily-card h3 { margin: 0 0 8px; font-size: 20px; }.daily-card p { color: #d9e8f0; line-height: 1.7; font-size: 13px; flex: 1; }.daily-card .button { background: var(--acid); color: var(--ink); border: 0; margin-top: 15px; }
.question-band { margin-block: 110px; padding: 55px; border-radius: 30px; background: var(--paper-2); display: grid; grid-template-columns: 1fr 1.45fr; gap: 65px; }
.question-band-copy p { color: var(--muted); line-height: 1.8; font-size: 14px; max-width: 370px; }
.class-cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.class-card { min-height: 230px; border-radius: 18px; background: var(--white); border: 1px solid var(--line); padding: 20px; display: flex; flex-direction: column; cursor: pointer; text-align: left; transition: .2s; }
.class-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--ink); }
.class-card > span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--acid); font: 700 17px monospace; }
.class-card h3 { margin: auto 0 7px; font-size: 18px; }.class-card p { color: var(--muted); font-size: 11px; margin: 0 0 18px; }.class-card strong { border-top: 1px solid var(--line); padding-top: 13px; font: 650 11px monospace; }
.source-note { margin-bottom: 100px; display: grid; grid-template-columns: 55px 1fr auto; align-items: center; gap: 20px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 28px 5px; }
.source-note > svg { font-size: 35px; color: var(--blue); }.source-note div { display: grid; grid-template-columns: auto 1fr; column-gap: 13px; align-items: baseline; }.source-note div span { font: 700 10px monospace; color: var(--muted); }.source-note div p { grid-column: 1 / 3; color: var(--muted); font-size: 12px; margin: 5px 0 0; }

.page-hero { padding-top: 88px; padding-bottom: 54px; border-bottom: 1px solid var(--line); }.page-hero.compact { padding-top: 62px; padding-bottom: 36px; }
.page-hero h1 { font-size: clamp(54px,7vw,84px); letter-spacing: -.06em; margin: 16px 0 8px; }.page-hero p { max-width: 650px; color: var(--muted); font-size: 16px; line-height: 1.7; }
.learn-toolbar { display: flex; justify-content: space-between; align-items: center; padding-block: 30px; }
.progress-summary { display: grid; grid-template-columns: auto 200px auto; align-items: center; gap: 13px; font-size: 12px; font-weight: 700; }
.progress-track { height: 7px; background: rgba(23,33,29,.1); border-radius: 10px; overflow: hidden; }.progress-track i { display: block; width: 0; height: 100%; background: var(--orange); border-radius: inherit; transition: width .4s ease; }
.search-box { width: 300px; height: 44px; border: 1px solid var(--line); border-radius: 99px; display: flex; align-items: center; gap: 8px; padding: 0 16px; background: var(--white); }.search-box svg { color: var(--muted); }.search-box input { width: 100%; border: 0; outline: none; background: none; font-size: 13px; }
.lesson-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; padding-bottom: 100px; }
.lesson-card { position: relative; min-height: 330px; border: 1px solid var(--line); background: var(--white); border-radius: var(--radius); padding: 25px; display: flex; flex-direction: column; overflow: hidden; cursor: pointer; text-align: left; transition: .24s ease; }
.lesson-card::before { content: ""; width: 150px; height: 150px; position: absolute; top: -80px; right: -60px; border: 24px solid var(--lesson-color,#dbe8cc); border-radius: 50%; opacity: .7; transition: .3s; }
.lesson-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }.lesson-card:hover::before { transform: scale(1.2); }
.lesson-meta { display: flex; justify-content: space-between; font: 700 9px monospace; color: var(--muted); letter-spacing: .09em; }.lesson-card .lesson-icon { margin-top: 48px; width: 50px; height: 50px; border-radius: 14px; background: var(--lesson-color); display: grid; place-items: center; font: 700 17px monospace; }
.lesson-card h2 { margin: auto 0 10px; font-size: 24px; letter-spacing: -.03em; }.lesson-card p { color: var(--muted); font-size: 13px; line-height: 1.65; margin: 0 0 21px; }.lesson-card footer { border-top: 1px solid var(--line); padding-top: 15px; display: flex; justify-content: space-between; font-size: 11px; font-weight: 750; }.lesson-card footer .complete { color: #547c48; }
.empty-state { padding: 70px 20px; text-align: center; color: var(--muted); grid-column: 1 / -1; }

.article-layout { display: grid; grid-template-columns: 245px minmax(0,780px); gap: 80px; align-items: start; padding-block: 55px 110px; }
.article-aside { position: sticky; top: 120px; }.back-link { padding: 5px 0; border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 12px; font-weight: 700; }
#articleNav { border-left: 1px solid var(--line); display: grid; margin-top: 32px; }#articleNav a { padding: 10px 18px; font-size: 12px; color: var(--muted); }#articleNav a:hover { color: var(--ink); border-left: 2px solid var(--ink); margin-left: -1px; }
.lesson-article header { padding-bottom: 35px; border-bottom: 1px solid var(--line); }.lesson-article header .article-index { font: 700 11px monospace; color: var(--orange); letter-spacing: .1em; }.lesson-article h1 { font-size: clamp(42px,6vw,68px); letter-spacing: -.055em; margin: 14px 0; }.lesson-article .article-lead { font-size: 18px; color: var(--muted); line-height: 1.85; }.lesson-article .article-meta { display: flex; gap: 20px; margin-top: 20px; color: var(--muted); font: 650 11px monospace; }
.article-section { padding-top: 45px; scroll-margin-top: 110px; }.article-section h2 { font-size: 27px; letter-spacing: -.03em; margin: 0 0 20px; }.article-section p { color: #4f5a54; line-height: 2; font-size: 15px; }.key-list { display: grid; gap: 10px; padding: 0; list-style: none; }.key-list li { padding: 15px 17px 15px 45px; background: var(--white); border: 1px solid var(--line); border-radius: 12px; line-height: 1.7; position: relative; font-size: 14px; }.key-list li::before { content: ""; position: absolute; left: 18px; top: 22px; width: 9px; height: 9px; background: var(--acid-dark); border-radius: 50%; }
.article-callout { margin-top: 45px; padding: 25px; background: var(--ink); color: var(--white); border-radius: 18px; }.article-callout span { font: 700 10px monospace; color: var(--acid); }.article-callout p { color: #d1d8d4; margin-bottom: 0; }.article-formula { margin: 25px 0; padding: 24px; border: 1px dashed var(--blue); border-radius: 14px; background: rgba(64,110,142,.06); text-align: center; font: 600 18px Georgia,serif; }.article-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 55px; padding-top: 25px; border-top: 1px solid var(--line); }

.setup-layout { display: grid; grid-template-columns: 1.45fr .7fr; gap: 25px; align-items: start; padding: 38px 0 105px; }.setup-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 5px 32px; }.setup-section { display: grid; grid-template-columns: 215px 1fr; gap: 20px; padding: 28px 0; border-bottom: 1px solid var(--line); }.setup-section:last-child { border: 0; }.setup-label { display: flex; gap: 14px; align-items: flex-start; }.setup-label > span { color: var(--orange); font: 700 10px monospace; margin-top: 4px; }.setup-label div { display: flex; flex-direction: column; gap: 5px; }.setup-label strong { font-size: 14px; }.setup-label small { font-size: 10px; color: var(--muted); }
.segment-control, .count-control { display: grid; grid-template-columns: repeat(3,1fr); background: var(--paper-2); padding: 4px; border-radius: 12px; }.segment-control button, .count-control button { border: 0; background: none; padding: 11px; border-radius: 9px; font-weight: 750; cursor: pointer; }.segment-control button.active, .count-control button.active { background: var(--ink); color: var(--white); box-shadow: 0 4px 10px rgba(23,33,29,.18); }.count-control { grid-template-columns: repeat(4,1fr); }
.select-wrap select { width: 100%; appearance: none; background: var(--paper-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2317211d'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E") no-repeat right 14px center; border: 0; border-radius: 12px; padding: 13px 45px 13px 15px; outline: none; }
.mode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }.mode-grid button { min-height: 84px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); display: grid; grid-template-columns: 34px 1fr; grid-template-rows: auto auto; column-gap: 4px; align-items: center; padding: 13px; text-align: left; cursor: pointer; }.mode-grid button > svg { grid-row: 1/3; font-size: 20px; }.mode-grid button strong { font-size: 12px; }.mode-grid button small { font-size: 9px; color: var(--muted); }.mode-grid button.active { border: 2px solid var(--ink); background: #f0f5d9; padding: 12px; }
.start-panel { position: sticky; top: 112px; background: var(--ink); color: var(--white); border-radius: var(--radius); padding: 30px; overflow: hidden; }.start-panel::after { content: ""; position: absolute; width: 170px; height: 170px; border: 40px solid rgba(217,243,106,.07); border-radius: 50%; right: -95px; top: -90px; }.start-visual { position: relative; height: 120px; display: grid; place-items: center; }.start-visual svg { font-size: 51px; color: var(--acid); fill: var(--acid); }.start-visual span { position: absolute; width: 100%; height: 1px; background: repeating-linear-gradient(90deg, transparent 0 5px, rgba(255,255,255,.2) 5px 9px); }.start-panel h2 { margin: 5px 0 8px; font-size: 19px; }.start-panel h2 strong { font-size: 43px; color: var(--acid); }.start-panel p { font-size: 11px; color: #b4beb9; min-height: 36px; }.start-panel .button { margin: 20px 0 12px; }.start-panel > small { display: block; text-align: center; color: #85918b; font-size: 9px; }

.quiz-view { min-height: calc(100vh - 82px); }.quiz-header { display: grid; grid-template-columns: 160px 1fr 160px; align-items: center; gap: 25px; padding-block: 24px; border-bottom: 1px solid var(--line); }.quiz-progress { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 12px; font: 700 11px monospace; }.quiz-score { text-align: right; }.quiz-score span { display: block; color: var(--muted); font-size: 9px; }.quiz-score strong { font-size: 25px; color: var(--blue); }
.quiz-layout { display: grid; grid-template-columns: 1fr 265px; gap: 25px; align-items: start; padding-block: 38px 95px; }.question-card { min-height: 590px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 36px 40px; }.question-topline { display: flex; justify-content: space-between; align-items: center; gap: 15px; }.question-tags { display: flex; gap: 7px; flex-wrap: wrap; }.question-tag { border: 1px solid var(--line); border-radius: 99px; padding: 5px 9px; font: 700 9px monospace; color: var(--muted); }.question-tag.multi { background: #fff3e5; color: #9a532f; border-color: #f0c6a2; }.bookmark-button { border: 0; background: none; cursor: pointer; color: var(--muted); font-size: 22px; }.bookmark-button.active { color: var(--orange); fill: var(--orange); }.bookmark-button.active svg { fill: currentColor; }
.question-card h2 { font-size: clamp(20px,3vw,28px); line-height: 1.55; letter-spacing: -.02em; margin: 29px 0; }.question-figure { display: grid; place-items: center; min-height: 180px; padding: 15px; margin: -8px 0 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }.question-figure img { max-width: min(100%, 520px); max-height: 300px; object-fit: contain; }.choice-list { display: grid; gap: 10px; }.choice-button { width: 100%; min-height: 62px; border: 1px solid var(--line); background: var(--paper); border-radius: 13px; padding: 13px 17px; display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: center; text-align: left; cursor: pointer; transition: .15s; }.choice-button:hover:not(:disabled) { border-color: var(--blue); background: #f1f6f7; }.choice-button .choice-key { width: 31px; height: 31px; border: 1px solid var(--line); border-radius: 8px; display: grid; place-items: center; font: 750 11px monospace; }.choice-button .choice-text { font-size: 14px; line-height: 1.55; }.choice-button.selected { border: 2px solid var(--ink); background: #edf3d1; padding: 12px 16px; }.choice-button.selected .choice-key { background: var(--ink); color: var(--white); }.choice-button.correct { border: 2px solid #56804e; background: #eaf4e6; padding: 12px 16px; }.choice-button.correct .choice-key { background: #56804e; color: white; }.choice-button.wrong { border: 2px solid var(--red); background: #fff0ed; padding: 12px 16px; }.choice-button.wrong .choice-key { background: var(--red); color: white; }.choice-button:disabled { color: var(--ink); cursor: default; }
.answer-feedback { margin-top: 20px; padding: 18px; border-left: 4px solid #56804e; background: #f0f7ed; border-radius: 0 10px 10px 0; }.answer-feedback.incorrect { border-color: var(--red); background: #fff2ef; }.answer-feedback strong { display: block; font-size: 14px; margin-bottom: 6px; }.answer-feedback p { color: var(--muted); font-size: 12px; line-height: 1.7; margin: 0; }.question-actions { display: flex; justify-content: space-between; margin-top: 27px; }.question-actions .button:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.quiz-map { position: sticky; top: 110px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }.quiz-map-head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 750; }.quiz-map-head button { border: 0; background: none; color: var(--muted); font-size: 10px; cursor: pointer; }.quiz-map-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 6px; margin-block: 18px; }.quiz-map-grid button { aspect-ratio: 1; border: 1px solid var(--line); background: var(--paper); border-radius: 7px; cursor: pointer; font: 650 9px monospace; }.quiz-map-grid button.done { background: var(--ink); color: var(--white); }.quiz-map-grid button.current { outline: 2px solid var(--orange); outline-offset: 2px; }.map-legend { display: flex; gap: 15px; color: var(--muted); font-size: 9px; }.map-legend span { display: flex; align-items: center; gap: 5px; }.map-legend i { width: 8px; height: 8px; border-radius: 2px; background: var(--ink); }.map-legend i.current { background: var(--orange); }.shortcut-note { margin-top: 22px; padding-top: 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: 9px; line-height: 1.6; }
.result-view { padding-block: 70px 110px; }.result-card { max-width: 750px; margin: 0 auto; border-radius: 28px; background: var(--ink); color: var(--white); padding: 45px; text-align: center; box-shadow: var(--shadow); }.result-kicker { color: var(--acid); font: 700 10px monospace; letter-spacing: .14em; }.result-card h1 { font-size: 41px; margin: 12px 0 30px; }.result-score-ring { width: 180px; height: 180px; margin: 0 auto 30px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--acid) var(--score),rgba(255,255,255,.1) 0); position: relative; }.result-score-ring::before { content: ""; position: absolute; inset: 10px; background: var(--ink); border-radius: 50%; }.result-score-ring div { z-index: 1; }.result-score-ring strong { display: block; font-size: 48px; }.result-score-ring span { color: #aab5af; font-size: 10px; }.result-stats { display: grid; grid-template-columns: repeat(3,1fr); border-block: 1px solid rgba(255,255,255,.15); padding: 20px 0; }.result-stats strong { display: block; font-size: 25px; }.result-stats span { color: #aab5af; font-size: 9px; }.result-actions { display: flex; justify-content: center; gap: 10px; margin-top: 28px; }.result-actions .button-ghost { color: white; border-color: rgba(255,255,255,.2); }

.progress-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 15px; padding-block: 35px; }.progress-stat { min-height: 180px; border-radius: var(--radius); padding: 24px; background: var(--white); border: 1px solid var(--line); display: flex; flex-direction: column; }.progress-stat.primary { background: var(--blue); color: var(--white); }.progress-stat span { color: var(--muted); font-size: 11px; }.progress-stat.primary span { color: #d7e3e9; }.progress-stat strong { font-size: 48px; letter-spacing: -.05em; margin: auto 0 6px; }.progress-stat small { font-size: 10px; color: var(--muted); }.progress-stat.primary small { color: #d7e3e9; }
.review-layout { display: grid; grid-template-columns: 1.5fr .75fr; gap: 20px; padding-bottom: 35px; }.review-panel,.category-panel { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }.panel-heading { display: flex; align-items: end; justify-content: space-between; border-bottom: 1px solid var(--line); padding-bottom: 21px; }.panel-heading h2,.category-panel h2 { font-size: 27px; }.review-tabs { background: var(--paper); border-radius: 9px; padding: 3px; }.review-tabs button { border: 0; background: none; padding: 7px 12px; border-radius: 7px; font-size: 10px; cursor: pointer; }.review-tabs button.active { background: var(--ink); color: white; }.review-item { display: grid; grid-template-columns: 1fr auto; gap: 15px; padding: 18px 0; border-bottom: 1px solid var(--line); }.review-item:last-child { border-bottom: 0; }.review-item span { color: var(--orange); font: 700 9px monospace; }.review-item p { margin: 7px 0 0; font-size: 13px; line-height: 1.6; }.review-item button { align-self: center; border: 1px solid var(--line); background: var(--paper); border-radius: 99px; padding: 7px 11px; font-size: 10px; cursor: pointer; }.review-empty { text-align: center; padding: 55px 15px; color: var(--muted); font-size: 12px; }.category-stat { margin-top: 24px; }.category-stat-head { display: flex; justify-content: space-between; font-size: 11px; margin-bottom: 8px; }.category-stat .progress-track i { background: var(--blue); }.category-stat small { display: block; margin-top: 6px; color: var(--muted); font-size: 9px; }
.reset-row { display: flex; justify-content: space-between; align-items: center; border: 1px solid rgba(201,79,69,.25); border-radius: 16px; padding: 22px 25px; margin-bottom: 95px; }.reset-row div { display: flex; flex-direction: column; gap: 5px; }.reset-row strong { font-size: 13px; }.reset-row span { color: var(--muted); font-size: 10px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin-block: 45px; }.about-grid article { background: var(--white); padding: 35px; min-height: 230px; }.about-grid article > span { font: 700 10px monospace; color: var(--orange); }.about-grid h2 { margin: 25px 0 12px; font-size: 23px; }.about-grid p { color: var(--muted); font-size: 13px; line-height: 1.9; }.about-callout { margin-bottom: 100px; background: var(--ink); color: var(--white); border-radius: var(--radius); padding: 38px; display: grid; grid-template-columns: 70px 1fr auto; align-items: center; gap: 20px; }.brand-mark.large { transform: scale(1.4); }.brand-mark.large span { border-color: var(--acid); }.brand-mark.large span:first-child { background: var(--acid); }.about-callout div:nth-child(2) { display: flex; flex-direction: column; gap: 5px; }.about-callout span { color: #aab5af; font-size: 11px; }.about-callout strong { font-size: 23px; }

.site-footer { background: var(--ink); color: var(--white); }.site-footer .section-shell { min-height: 145px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }.footer-brand .brand-mark span { border-color: var(--acid); }.footer-brand .brand-mark span:first-child { background: var(--acid); }.footer-brand .brand-copy small { color: #96a19b; }.site-footer p { color: #929e98; font-size: 12px; }.footer-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 7px; color: #929e98; font: 650 9px monospace; }.footer-meta a { transition: color .18s ease; }.footer-meta a:hover { color: var(--acid); }.public-security-record { display: inline-flex; align-items: center; gap: 5px; }.public-security-record svg { flex: 0 0 auto; }
.mobile-nav { display: none; }
.toast { position: fixed; z-index: 40; left: 50%; bottom: 25px; transform: translate(-50%,20px); padding: 11px 17px; border-radius: 99px; background: var(--ink); color: white; font-size: 11px; opacity: 0; pointer-events: none; transition: .22s; box-shadow: var(--shadow); }.toast.show { opacity: 1; transform: translate(-50%,0); }
.modal { display: none; position: fixed; inset: 0; z-index: 50; place-items: center; padding: 20px; }.modal.open { display: grid; }.modal-backdrop { position: absolute; inset: 0; background: rgba(17,24,21,.65); backdrop-filter: blur(5px); }.modal-card { position: relative; z-index: 1; width: min(430px,100%); border-radius: var(--radius); background: var(--white); padding: 34px; text-align: center; box-shadow: var(--shadow); }.modal-close { position: absolute; right: 15px; top: 15px; border: 0; background: none; cursor: pointer; }.modal-icon { width: 50px; height: 50px; border-radius: 50%; background: #fff0ed; color: var(--red); display: grid; place-items: center; margin: 0 auto; font: 700 24px Georgia; }.modal-card h2 { margin: 18px 0 8px; }.modal-card p { color: var(--muted); font-size: 12px; line-height: 1.7; }.modal-actions { display: flex; justify-content: center; gap: 9px; margin-top: 24px; }

@media (prefers-reduced-motion: no-preference) {
  .reveal { animation: reveal .6s ease both; }.reveal:nth-child(2) { animation-delay: .08s; }
  @keyframes reveal { from { opacity: 0; transform: translateY(18px); } }
}
@media (max-width: 920px) {
  :root { --shell: min(100% - 32px, 760px); }
  .desktop-nav { display: none; }.menu-button { display: grid; }.edition-pill { display: none; }
  .site-header { height: 70px; padding-inline: 16px; }.site-header.menu-open { height: auto; flex-wrap: wrap; padding-block: 14px; }.site-header.menu-open .desktop-nav { display: grid; width: 100%; order: 3; height: auto; gap: 0; padding-top: 12px; }.site-header.menu-open .desktop-nav a { padding: 13px; border-top: 1px solid var(--line); }.site-header.menu-open .desktop-nav a::after { display: none; }
  .hero { grid-template-columns: 1fr; gap: 30px; padding-top: 55px; }.hero h1 { font-size: clamp(47px,11vw,75px); }.radio-stage { min-height: 420px; }.radio-card { max-width: 500px; }.frequency-note { left: 3%; }
  .quick-stats { margin-bottom: 75px; }.quick-stats div { padding: 22px 19px; }
  .path-layout,.question-band,.setup-layout,.review-layout { grid-template-columns: 1fr; }.daily-card { min-height: 410px; }.question-band { gap: 35px; padding: 40px; }.start-panel { position: static; }.quiz-layout { grid-template-columns: 1fr; }.quiz-map { position: static; order: -1; }.quiz-map-grid { grid-template-columns: repeat(10,1fr); }
  .article-layout { grid-template-columns: 1fr; gap: 30px; }.article-aside { position: static; }#articleNav { display: none; }
  .lesson-grid { grid-template-columns: 1fr 1fr; }.progress-grid { grid-template-columns: 1fr 1fr; }.progress-stat.primary { grid-column: 1/-1; }.setup-section { grid-template-columns: 170px 1fr; }
}
@media (max-width: 620px) {
  :root { --shell: calc(100% - 24px); --radius: 18px; }
  body { padding-bottom: 68px; }.site-header { position: relative; }.site-footer { margin-bottom: -68px; padding-bottom: 68px; }
  .menu-button { display: none; }.brand-copy strong { font-size: 16px; }.hero { min-height: 0; padding-block: 45px; }.hero h1 { font-size: 46px; }.hero-copy > p { font-size: 15px; }.hero-actions { align-items: stretch; flex-direction: column; }.hero-proof { gap: 10px 16px; }
  .radio-stage { min-height: 330px; }.radio-card { width: 92%; padding: 16px; }.radio-display strong { font-size: 48px; }.radio-display strong small { font-size: 27px; }.main-knob { width: 58px; height: 58px; }.small-knob { width: 34px; height: 34px; }.speaker-grid { width: 72px; }.air-rings { width: 320px; height: 320px; }.ring-two { width: 260px; height: 260px; }.frequency-note { bottom: 5px; }
  .quick-stats { grid-template-columns: 1fr 1fr; margin-bottom: 65px; }.quick-stats div:nth-child(2) { border-right: 0; }.quick-stats div:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.12); }.quick-stats strong { font-size: 25px; }
  .section-heading { align-items: start; gap: 20px; }.section-heading .text-link { font-size: 0; }.section-heading .text-link svg { font-size: 16px; }.path-item { grid-template-columns: 46px 1fr auto; padding: 18px 16px; }.path-item.done::after { display: none; }.daily-card { min-height: 400px; }.question-band { margin-block: 70px; padding: 27px 20px; }.class-cards { grid-template-columns: 1fr; }.class-card { min-height: 150px; }.class-card h3 { margin-top: 25px; }.source-note { grid-template-columns: 40px 1fr; }.source-note .text-link { display: none; }.source-note div { grid-template-columns: 1fr; }.source-note div p { grid-column: auto; }.source-note div > span { margin-bottom: 5px; }
  .page-hero,.page-hero.compact { padding-top: 50px; }.page-hero h1 { font-size: 50px; }.learn-toolbar { align-items: stretch; flex-direction: column; gap: 18px; }.progress-summary { grid-template-columns: auto 1fr auto; }.search-box { width: 100%; }.lesson-grid { grid-template-columns: 1fr; }.lesson-card { min-height: 280px; }.lesson-card .lesson-icon { margin-top: 35px; }
  .article-layout { padding-top: 28px; }.lesson-article .article-lead { font-size: 16px; }.lesson-article h1 { font-size: 42px; }.article-actions { flex-wrap: wrap; gap: 10px; }
  .setup-card { padding: 2px 18px; }.setup-section { grid-template-columns: 1fr; gap: 15px; }.mode-grid { grid-template-columns: 1fr 1fr; }.quiz-header { grid-template-columns: auto 1fr auto; gap: 10px; }.quiz-header .back-link { font-size: 0; }.quiz-header .back-link::after { content: "退出"; font-size: 11px; }.quiz-score span { display: none; }.question-card { padding: 24px 17px; min-height: 0; }.question-card h2 { font-size: 19px; margin: 22px 0; }.choice-button { padding: 11px; grid-template-columns: 30px 1fr; }.choice-button.selected,.choice-button.correct,.choice-button.wrong { padding: 10px; }.choice-button .choice-text { font-size: 13px; }.quiz-map { overflow: auto; }.quiz-map-grid { grid-template-columns: repeat(10,30px); }.result-card { padding: 35px 18px; }.result-actions { flex-direction: column; }
  .progress-grid { grid-template-columns: 1fr 1fr; }.progress-stat { min-height: 150px; padding: 18px; }.progress-stat strong { font-size: 38px; }.review-panel,.category-panel { padding: 20px 16px; }.reset-row { align-items: stretch; flex-direction: column; gap: 16px; }.about-grid { grid-template-columns: 1fr; }.about-callout { grid-template-columns: 55px 1fr; }.about-callout .button { grid-column: 1/-1; }
  .site-footer .section-shell { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 35px; }.footer-meta { align-items: flex-start; }.mobile-nav { display: grid; grid-template-columns: repeat(4,1fr); position: fixed; z-index: 18; bottom: 0; left: 0; right: 0; height: 68px; background: rgba(255,254,249,.95); border-top: 1px solid var(--line); backdrop-filter: blur(12px); }.mobile-nav a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; font-size: 9px; color: var(--muted); }.mobile-nav svg { font-size: 19px; }.mobile-nav a.active { color: var(--ink); }.mobile-nav a.active svg { color: var(--orange); }
}