/* 课迹网页。颜色、圆角、动效来自 tokens.css（从课迹扩展仓库复制，两边同一份）。 */
* { box-sizing: border-box; }
html { background: var(--kj-bg); scroll-behavior: smooth; }
body { margin: 0; background: var(--kj-bg); color: var(--kj-ink); font: 16px/1.7 var(--kj-font); -webkit-text-size-adjust: 100%; }
a { color: var(--kj-green); }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.sp { flex: 1; }
:focus-visible { outline: 2px solid var(--kj-green); outline-offset: 2px; }

/* 柯基 */
.corgi { display: block; overflow: visible; transform-box: fill-box; transform-origin: 50% 80%; }
.corgi .fur { fill: #e8913f; } .corgi .inner { fill: #f6c9a0; } .corgi .face { fill: #fff8ef; }
.corgi .ink { fill: #1c2330; } .corgi .glint { fill: #fff; } .corgi .eyes-shut { display: none; }
.corgi .line { fill: none; stroke: #1c2330; stroke-width: 3; stroke-linecap: round; }
.corgi .ear { transform-box: fill-box; } .corgi .ear-l { transform-origin: 80% 95%; } .corgi .ear-r { transform-origin: 20% 95%; }
@keyframes kj-wag { 0%, 100% { transform: rotate(0); } 30% { transform: rotate(-9deg); } 65% { transform: rotate(7deg); } }
@keyframes kj-perk-l { 50% { transform: rotate(-14deg); } } @keyframes kj-perk-r { 50% { transform: rotate(14deg); } }
.wag .corgi { animation: kj-wag var(--kj-dur-wag) ease-in-out 1; }
.wag .corgi .ear-l { animation: kj-perk-l var(--kj-dur-wag) ease-in-out 1; }
.wag .corgi .ear-r { animation: kj-perk-r var(--kj-dur-wag) ease-in-out 1; }
.paw { fill: var(--kj-paw); }

/* 顶栏 */
.nav { display: flex; align-items: center; gap: 10px; height: 64px; }
.nav .brand { display: flex; align-items: center; gap: 10px; color: var(--kj-ink); text-decoration: none; font-weight: 700; font-size: 18px; }
.nav .brand .corgi { width: 34px; height: 34px; }
.nav .brand small { color: var(--kj-mut); font-weight: 500; font-size: 14px; }
.nav nav { display: flex; gap: 4px; }
.nav nav a { color: var(--kj-mut); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: var(--kj-r-pill); white-space: nowrap; }
.nav nav a:hover { background: var(--kj-soft); color: var(--kj-ink); }
.nav nav a.lang { border: 1px solid var(--kj-line); color: var(--kj-ink); }

/* 首屏 */
.hero { display: grid; grid-template-columns: 1fr 1.08fr; gap: 48px; align-items: center; padding: 40px 0 64px; }
.hero h1 { margin: 0 0 16px; font-size: clamp(30px, 4.4vw, 46px); line-height: 1.22; letter-spacing: -.01em; }
.hero h1 em { font-style: normal; color: var(--kj-accent); }
.hero .lead { margin: 0 0 24px; font-size: 18px; color: var(--kj-mut); max-width: 32em; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 22px; border-radius: var(--kj-r-pill);
  border: 1px solid var(--kj-line); background: var(--kj-card); color: var(--kj-ink); font: 600 16px/1 var(--kj-font); text-decoration: none; cursor: pointer;
  transition: transform var(--kj-dur-fast), border-color var(--kj-dur-fast); }
.btn:hover { border-color: var(--kj-pri); }
.btn:active { transform: scale(.98); }
.btn.primary { background: var(--kj-pri); border-color: var(--kj-pri); color: var(--kj-pri-ink); box-shadow: 0 3px 0 var(--kj-pri-edge); }
.fine { margin: 14px 0 0; font-size: 13.5px; color: var(--kj-mut); }

/* 演示：假视频 + 课迹面板 */
.demo { background: var(--kj-card); border-radius: 22px; padding: 14px; box-shadow: var(--kj-shadow-float); }
.screen { position: relative; aspect-ratio: 16 / 9; border-radius: 14px; overflow: hidden; background: #111; color: #222; }
.slide { position: absolute; inset: 8% 9% 22%; background: #f6f5ef; border-radius: 4px; padding: 5% 6%; font: 700 clamp(12px, 1.6vw, 17px)/1.4 var(--kj-font); }
.slide small { display: block; margin-top: 4px; font-weight: 400; color: #666; font-size: .82em; }
.slide svg { position: absolute; right: 7%; bottom: 10%; width: 40%; height: 60%; }
.slide .dotx { transition: transform var(--kj-dur) var(--kj-ease); }
.vbar { position: absolute; left: 0; right: 0; bottom: 0; padding: 0 14px 10px; display: flex; align-items: center; gap: 10px; color: #fff;
  background: linear-gradient(transparent, rgba(0,0,0,.55)); height: 56px; }
.vbar button { all: unset; cursor: pointer; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; }
.vbar button:hover { background: rgba(255,255,255,.15); }
.vbar button svg { width: 18px; height: 18px; fill: #fff; }
.vbar .vt { font: 600 13px/1 var(--kj-font); font-variant-numeric: tabular-nums; white-space: nowrap; }
.vtrack { position: relative; flex: 1; height: 26px; }
.vtrack::before, .vtrack .fill { content: ""; position: absolute; left: 0; top: 50%; height: 4px; margin-top: -2px; border-radius: 2px; }
.vtrack::before { right: 0; background: rgba(255,255,255,.3); }
.vtrack .fill { background: #f00; }
.vtrack .mark { all: unset; position: absolute; top: 1px; width: 24px; height: 24px; margin-left: -12px; cursor: pointer; display: grid; place-items: center;
  border-radius: 50%; background: #fdead3; box-shadow: 0 0 0 2px rgba(0,0,0,.35); transition: transform var(--kj-dur-fast) var(--kj-ease-spring); }
.vtrack .mark:hover { transform: scale(1.15); }
.vtrack .mark svg { width: 15px; height: 15px; fill: #e8913f; }
@keyframes kj-stamp { 0% { transform: scale(1.8); opacity: 0; } 60% { transform: scale(.9); opacity: 1; } 100% { transform: scale(1); } }
.vtrack .mark.new { animation: kj-stamp var(--kj-dur) var(--kj-ease) 1; }

.mini { margin-top: 12px; background: var(--kj-bg); border-radius: 16px; padding: 12px; position: relative; }
.mini-head { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14px; margin-bottom: 10px; }
.mini-head .corgi { width: 24px; height: 24px; }
.mini-head .state { margin-left: auto; font-weight: 500; font-size: 12.5px; color: var(--kj-mut); font-variant-numeric: tabular-nums; }
.mini-head .state i { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--kj-green); margin-right: 6px; vertical-align: 1px; }
.mini-head .state.paused i { background: var(--kj-mut); }
.compose { display: flex; gap: 8px; }
.compose input { flex: 1; min-width: 0; height: 40px; padding: 0 12px; font: inherit; font-size: 14.5px; color: var(--kj-ink);
  background: var(--kj-card); border: 1px solid var(--kj-line); border-radius: var(--kj-r-sm); }
.compose input::placeholder { color: var(--kj-mut); }
.compose .btn { height: 40px; padding: 0 14px; font-size: 14px; font-variant-numeric: tabular-nums; flex: none; }
.mini ul { list-style: none; margin: 12px 0 0; padding: 0; max-height: 152px; overflow: auto; scrollbar-width: thin; }
.mini li { position: relative; display: flex; gap: 10px; align-items: flex-start; padding: 0 0 10px; font-size: 14.5px; line-height: 1.5; }
.mini li:last-child { padding-bottom: 0; }
.mini li:not(:last-child)::before { content: ""; position: absolute; left: 11px; top: 26px; bottom: 2px; border-left: 2px dotted var(--kj-paw-trail); }
.mini li span { padding-top: 1px; overflow-wrap: anywhere; }
.ts { all: unset; flex: none; cursor: pointer; display: inline-flex; align-items: center; gap: 5px; height: 24px; padding: 0 10px 0 2px; border-radius: var(--kj-r-pill);
  background: var(--kj-paw-soft); color: var(--kj-ts-ink); font: 700 12.5px/1 var(--kj-font); font-variant-numeric: tabular-nums;
  transition: transform var(--kj-dur-fast) var(--kj-ease-spring); }
.ts:hover { transform: translateY(-1px); }
.ts svg { width: 20px; height: 20px; padding: 3px; border-radius: 50%; background: var(--kj-card); }
@keyframes kj-pop { 40% { transform: scale(1.1); } }
@keyframes kj-ring { from { box-shadow: 0 0 0 0 var(--kj-paw); } to { box-shadow: 0 0 0 8px transparent; } }
.ts.on { background: var(--kj-pri); color: var(--kj-pri-ink); animation: kj-pop 280ms var(--kj-ease-spring) 1; }
.ts.on svg { animation: kj-ring 600ms ease-out 1; }
.toast { position: absolute; left: 50%; bottom: 12px; transform: translate(-50%, 8px); opacity: 0; pointer-events: none; white-space: nowrap;
  background: var(--kj-toast-bg); color: var(--kj-toast-ink); padding: 6px 14px; border-radius: var(--kj-r-pill); font-size: 13px; font-weight: 600;
  box-shadow: var(--kj-shadow-toast); transition: opacity var(--kj-dur-fast), transform var(--kj-dur-fast) var(--kj-ease-spring); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.demo-cap { margin: 12px 4px 0; font-size: 13.5px; color: var(--kj-mut); text-align: center; }

/* 区块 */
section.block { padding: 56px 0; }
section.block + section.block { border-top: 1px solid var(--kj-line); }
.block h2 { margin: 0 0 8px; font-size: clamp(24px, 3vw, 30px); line-height: 1.3; }
.block .sub { margin: 0 0 28px; color: var(--kj-mut); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--kj-card); border-radius: var(--kj-r-lg); padding: 22px; box-shadow: var(--kj-shadow-card); }
.card .ic { width: 44px; height: 44px; border-radius: 14px; background: var(--kj-paw-soft); display: grid; place-items: center; margin-bottom: 14px; }
.card .ic svg { width: 24px; height: 24px; }
.card .ic .st { fill: none; stroke: var(--kj-ts-ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--kj-mut); font-size: 15px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.chips li { padding: 6px 14px; border-radius: var(--kj-r-pill); background: var(--kj-soft); font-size: 14px; }

.shots { display: grid; grid-template-columns: 250px 250px 1fr; gap: 24px; align-items: start; }
.shots figure { margin: 0; }
.shots img { border-radius: 16px; box-shadow: var(--kj-shadow-float); background: var(--kj-card); }
.shots figcaption { margin-top: 12px; font-size: 14px; color: var(--kj-mut); text-align: center; }
.shots .tall img { width: 100%; }

.install { display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; align-items: start; }
ol.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; }
ol.steps li { counter-increment: s; position: relative; padding: 0 0 18px 48px; }
ol.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  background: var(--kj-pri); color: var(--kj-pri-ink); font-weight: 700; font-size: 15px; }
ol.steps li:not(:last-child)::after { content: ""; position: absolute; left: 15px; top: 38px; bottom: 6px; border-left: 2px dotted var(--kj-paw-trail); }
ol.steps b { display: block; }
code, kbd { font: 600 .9em/1 ui-monospace, Consolas, monospace; background: var(--kj-soft); border-radius: 6px; padding: 2px 6px; }
.side-card { background: var(--kj-card); border-radius: var(--kj-r-lg); padding: 20px 22px; box-shadow: var(--kj-shadow-card); font-size: 15px; }
.side-card h3 { margin: 0 0 8px; font-size: 16px; }
.side-card ul { margin: 0 0 14px; padding-left: 20px; }
.side-card ul:last-child { margin-bottom: 0; }

.foot { padding: 28px 0 48px; color: var(--kj-mut); font-size: 14px; display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; border-top: 1px solid var(--kj-line); }
.foot .corgi { width: 22px; height: 22px; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 32px; padding-top: 16px; }
  .cards, .shots, .install { grid-template-columns: 1fr; }
  .shots .tall img { max-height: none; width: 100%; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .nav nav a:not(.lang) { display: none; }
  .nav .brand small { display: none; }
  .demo { padding: 10px; border-radius: 18px; }
  .compose { flex-wrap: wrap; }
  .compose .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } html { scroll-behavior: auto; } }