/* 鸿鹄计划 · 雁阵版
   五样东西贯穿全页：墨雁、金雁（孩子）、点线航迹、折线标注、沙色地平线。
   全页同一米白底，不做深浅区块交替。 */

:root {
  --bg: #FBF8F3;
  --dawn: #F7EDE1;
  --glow: #F8DDBF;
  --hill: #E7DCCD;
  --hill-far: #EFE5D7;
  --bird: #3B3631;
  --ink: #2D2925;
  --ink-2: #645C53;
  --line: #8C8378;
  --line-soft: rgba(45, 41, 37, .12);
  --gold: #D59A3E;
  --gold-ink: #94601A;
  --card: #FFFDF9;
  --wing: #6E665D;      /* 远侧翅膀：第二种墨色 */
  --wing-gold: #B07A2C;

  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "STSong", "SimSun", serif;
  --head: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;  /* 内页标题：黑体加粗，跟宣传册内页一致 */
  --sans: "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  --wrap: 1200px;
  --gutter: clamp(20px, 5vw, 72px);
  --nav-h: 84px;
  --ease: cubic-bezier(.22, .8, .24, 1);
  --click: cubic-bezier(.3, 1.4, .5, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: var(--nav-h); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.8 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
h1, h2, h3, p, ol, ul, dl, dd { margin: 0; }
p, li, h3, dd, small { text-wrap: pretty; }
ol, ul { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; color: inherit; }
svg { display: block; }
[hidden] { display: none !important; }
::selection { background: #F3DEBE; }
:focus-visible { outline: 2px solid var(--gold-ink); outline-offset: 3px; border-radius: 6px; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; padding: 8px 14px; background: var(--card); border-radius: 8px; }
.skip:focus { top: 12px; }
.wrap { width: min(100% - 2 * var(--gutter), var(--wrap)); margin-inline: auto; }

/* ---------- 按钮：全圆角，按下轻沉 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; height: 50px; padding: 0 28px; border-radius: 999px;
  font-size: 15px; letter-spacing: .05em; white-space: nowrap; cursor: pointer; border: 1px solid transparent;
  transition: transform .3s var(--click), background-color .25s, border-color .25s, color .25s;
}
.btn:active { transform: translateY(1px) scale(.97); transition-duration: .08s; }
.btn-solid { background: var(--ink); color: var(--bg); }
.btn-solid:hover { background: #45403A; }
.btn-line { border-color: rgba(45, 41, 37, .32); background: rgba(251, 248, 243, .86); }
.btn-line:hover { border-color: var(--ink); }
.btn-block { width: 100%; height: 56px; }

/* ---------- 导航 ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: 50; height: var(--nav-h); transition: background-color .4s, box-shadow .4s; }
.nav.is-scrolled { background: rgba(251, 248, 243, .82); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); box-shadow: 0 1px 0 var(--line-soft); }
.nav-inner { height: 100%; width: min(100% - 2 * var(--gutter), var(--wrap)); margin-inline: auto; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand svg { width: 34px; height: 15px; fill: var(--bird); }
.brand b { font: 700 21px/1 var(--serif); letter-spacing: .16em; }
.nav-menu { display: flex; align-items: center; gap: 30px; }
.nav-menu ul { display: flex; gap: 30px; font-size: 15px; }
.nav-menu ul a { position: relative; padding: 6px 0; }
.nav-menu ul a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--ink); transform: scaleX(0); transform-origin: left; transition: transform .4s var(--ease); }
.nav-menu ul a:hover::after, .nav-menu ul a.is-active::after { transform: scaleX(1); }
.nav-menu .btn { height: 44px; padding: 0 22px; font-size: 15px; }
.nav-login { font-size: 15px; color: var(--ink); padding: 6px 2px; border-bottom: 1px dashed rgba(45, 41, 37, .4); margin-left: -6px; }
.nav-login:hover { border-bottom-style: solid; }
.text-link { color: var(--gold-ink); border-bottom: 1px solid rgba(148, 96, 26, .35); }
.text-link:hover { border-bottom-color: var(--gold-ink); }
.nav-toggle { display: none; position: relative; width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(251, 248, 243, .8); cursor: pointer; }
.nav-toggle span { position: absolute; left: 13px; right: 13px; height: 1.6px; background: var(--ink); transition: transform .35s var(--ease), top .35s var(--ease); }
.nav-toggle span:first-child { top: 18px; } .nav-toggle span:last-child { top: 25px; }
.nav-toggle[aria-expanded="true"] span { top: 21.5px; }
.nav-toggle[aria-expanded="true"] span:first-child { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: rotate(-45deg); }

/* ---------- 1 首屏 ---------- */
.hero { position: relative; height: 150vh; }
.hero-stage { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
.hero-sky { position: absolute; inset: 0; background: radial-gradient(80% 80% at 18% 96%, var(--glow) 0%, rgba(248, 221, 191, 0) 62%), linear-gradient(180deg, var(--bg) 0%, var(--dawn) 100%); }
.hero-scene { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-ground { position: absolute; left: 0; right: 0; bottom: 0; width: 100%; height: clamp(90px, 15vh, 140px); }
.hero-tall { display: none; }
.hill-far { fill: var(--hill-far); }
.hill-near { fill: var(--hill); }
.trail { fill: none; stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 8; opacity: .6; }
.handoff { fill: none; stroke: var(--line); stroke-width: 1.2; stroke-dasharray: 2 8; opacity: 0; }
.flock use { fill: var(--bird); }
.flock .is-child { fill: var(--gold); --wing: var(--wing-gold); }
.tags path { fill: none; stroke: var(--line); stroke-width: 1; }
.tags circle { fill: var(--line); }
.tags .child-dot { fill: var(--gold-ink); }
.tag { font: 400 15px/1 var(--sans); fill: var(--ink-2); }
.tag .k { font-weight: 600; fill: var(--ink); }
.tag.child .k { fill: var(--gold-ink); }

.hero-copy { position: absolute; left: max(var(--gutter), calc((100vw - var(--wrap)) / 2)); bottom: 13vh; z-index: 2; }
.hero-title { font: 700 clamp(46px, 5.2vw, 80px)/1.16 var(--serif); letter-spacing: .06em; transform-origin: 0 100%; }
.hero-sub { margin-top: 22px; font-size: 18px; color: #554D45; letter-spacing: .03em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

/* ---------- 章节通用 ---------- */
.sec { position: relative; padding: clamp(80px, 8.5vw, 120px) 0 0; }
.kicker { font-size: 15px; letter-spacing: .14em; color: var(--gold-ink); margin-bottom: 18px; }
.sec-title { font: 600 clamp(30px, 3.2vw, 44px)/1.36 var(--head); letter-spacing: .02em; }
.sec-lead { margin-top: 16px; font-size: 18px; color: var(--ink-2); }
.sec-body { margin-top: 28px; max-width: 640px; font-size: 18px; color: var(--ink-2); }

/* 出场：默认可见，有 JS 时由 GSAP 接管 */
.js .reveal { opacity: 0; }
.no-motion .reveal { opacity: 1 !important; transform: none !important; }
.no-motion .hero { height: auto; }
.no-motion .hero-stage { position: relative; }

/* ---------- 家长常问：六条原话，每条带一句回答和去处 ---------- */
.worries { display: grid; gap: 30px; max-width: 1140px; margin-top: 60px; }
.worries li { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: 12px 56px; align-items: start; }
.worries q { position: relative; quotes: "“" "”"; font: 500 21px/1.6 var(--head); color: var(--ink); text-wrap: pretty; line-break: strict; }
.worries q::before { position: absolute; right: 100%; margin-right: 2px; color: var(--gold); }
.ans { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 14px; padding-top: 5px; }
.ans svg { width: 34px; height: 15px; margin-top: 6px; fill: var(--gold); --wing: var(--wing-gold); transform: rotate(-8deg); }
.ans p { font-size: 17px; color: var(--ink); text-wrap: pretty; }
.ans a { display: inline-block; margin-top: 6px; font-size: 15px; color: var(--gold-ink); }
.ans a::after { content: " →"; transition: margin .3s var(--ease); }
.ans a:hover::after { margin-left: 4px; }
.worries-end { margin-top: 48px; padding: 18px 24px; border-radius: 999px; background: rgba(213, 154, 62, .12); font: 600 18px/1.5 var(--head); color: #7E5115; display: inline-block; }

/* ---------- 区块内的小节 ---------- */
.sub { margin-top: 120px; }
.sub-title { font: 600 clamp(24px, 2.3vw, 32px)/1.42 var(--head); letter-spacing: .02em; }
.sub-gap { margin-top: 104px; }
.rhythm-line { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 22px; margin-top: 36px; padding-top: 20px; border-top: 1px dashed rgba(140, 131, 120, .5); font-size: 17px; }
.rhythm-line b { font-weight: 600; color: var(--ink-2); font-size: 15px; margin-right: 6px; }
.rhythm-line span + span::before { content: "·"; margin-right: 22px; color: var(--line); }

/* ---------- 家长端预览 ---------- */
.portal-peek { display: grid; grid-template-columns: 5fr 6fr; gap: 64px; align-items: center; }
.peek-text p { margin-top: 18px; max-width: 30em; color: var(--ink-2); }
.peek-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 30px; }
.peek-shot { display: block; padding: 26px 28px 24px; border-radius: 20px; background: var(--card); box-shadow: 0 0 0 1px var(--line-soft), 0 24px 50px -36px rgba(59, 54, 49, .5); transition: transform .5s var(--ease), box-shadow .5s var(--ease); }
.peek-shot:hover { transform: translateY(-4px); box-shadow: 0 0 0 1px rgba(45, 41, 37, .18), 0 30px 60px -36px rgba(59, 54, 49, .55); }
.peek-head { display: flex; align-items: baseline; gap: 14px; }
.peek-head b { font: 600 21px/1.3 var(--head); }
.peek-head span { font-size: 15px; color: var(--ink-2); }
.peek-route { width: 100%; height: auto; margin: 14px 0 6px; overflow: visible; }
.peek-done { fill: none; stroke: var(--gold); stroke-width: 3.2; stroke-linecap: round; }
.peek-todo { fill: none; stroke: var(--line); stroke-width: 1.4; stroke-dasharray: 2 7; stroke-linecap: round; }
.peek-terms circle { fill: var(--bg); stroke: var(--line); stroke-width: 1.2; }
.peek-terms .now { fill: var(--gold); stroke: var(--gold-ink); }
.peek-bird { fill: var(--gold); --wing: var(--wing-gold); }
.peek-list { display: grid; gap: 8px; padding: 14px 0; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); font-size: 15px; }
.peek-list li { display: flex; align-items: center; gap: 10px; color: var(--ink-2); }
.peek-list i { flex: none; width: 10px; height: 10px; border-radius: 50%; box-shadow: inset 0 0 0 1.4px var(--line); }
.peek-list .done { color: var(--ink); } .peek-list .done i { background: var(--ink); box-shadow: none; }
.peek-list .doing { color: var(--ink); } .peek-list .doing i { box-shadow: inset 0 0 0 1.6px var(--gold-ink); background: linear-gradient(90deg, var(--gold) 50%, transparent 50%); }
.peek-report { display: flex; justify-content: space-between; gap: 12px; margin-top: 14px; font-size: 15px; color: var(--ink-2); }
.peek-report b { color: var(--ink); font-weight: 600; }

/* ---------- 2 为什么从大一开始：五条点线航迹，长短就是计分的时间段 ---------- */
.score { position: relative; margin-top: 56px; padding-left: 132px; }
.score-head { display: grid; grid-template-columns: repeat(4, 1fr); padding-bottom: 12px; border-bottom: 1px solid var(--line-soft); font: 600 15px/1 var(--head); letter-spacing: .02em; color: var(--ink-2); }
.score-rows { display: grid; gap: 34px; margin-top: 30px; }
.score-row { position: relative; display: grid; grid-template-columns: repeat(8, 1fr); row-gap: 10px; }
.score-row b { position: absolute; left: -132px; top: 0; font: 600 21px/1.2 var(--head); letter-spacing: .02em; }
.score-row span { grid-column: var(--from) / var(--to); grid-row: 1; font-size: 17px; color: var(--ink); }
.leg-line { grid-column: var(--from) / var(--to); grid-row: 2; height: 14px; margin: 8px 0 4px; border-radius: 999px; background: var(--hill); transform-origin: left; }
.score-note { position: relative; display: flex; align-items: center; gap: 18px; margin: 48px 0 0 calc((100% - 132px) * .5 - 0px); font: 500 21px/1.6 var(--head); }
.late-goose svg { width: 64px; height: 28px; fill: #A39A8F; --wing: #C9C0B4; transform: rotate(-20deg); }

/* ---------- 3 怎么做：倒着画的航线 ---------- */
.route { position: relative; margin-top: 40px; }
.route-wide { width: 100%; height: auto; overflow: visible; }
.route-tall { display: none; }
.route-path { fill: none; stroke: var(--ink); stroke-width: 1.6; stroke-dasharray: 3 9; stroke-linecap: round; }
.route-end circle:first-child { fill: none; stroke: var(--gold-ink); stroke-width: 1.6; }
.route-end circle:nth-child(2) { fill: var(--gold); }
.route-end path { fill: var(--hill); }
.route-start use { fill: var(--gold); --wing: var(--wing-gold); }
.route-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; margin-top: 24px; }
.route-steps .n { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--ink); font: 700 15px/1 var(--serif); }
.route-steps h3 { margin-top: 18px; font: 600 26px/1.3 var(--head); letter-spacing: .02em; }
.route-steps p { margin-top: 8px; color: var(--ink-2); }
.route-label { font: 400 15px/1 var(--sans); letter-spacing: .1em; fill: var(--ink-2); }

/* ---------- 4 五条赛道：扇形航线 ---------- */
.tabs { position: relative; display: inline-flex; gap: 4px; margin-top: 44px; padding: 5px; border-radius: 999px; box-shadow: inset 0 0 0 1px var(--line-soft); background: rgba(255, 253, 249, .7); }
.tab-slider { position: absolute; top: 5px; left: 0; height: calc(100% - 10px); border-radius: 999px; background: var(--ink); transition: transform .5s var(--click), width .5s var(--click); }
.tab { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; padding: 10px 26px 9px; border: 0; border-radius: 999px; background: none; cursor: pointer; line-height: 1.3; transition: color .3s; }
.tab b { font-size: 15px; font-weight: 600; letter-spacing: .06em; }
.tab i { font-style: normal; font-size: 13px; color: var(--ink-2); transition: color .3s; }
.tab[aria-selected="true"] { color: var(--bg); }
.tab[aria-selected="true"] i { color: rgba(251, 248, 243, .7); }
.fan { margin-top: 40px; }
.fan svg { width: 100%; height: auto; overflow: visible; }
.fan-line path { fill: none; stroke: var(--line); stroke-width: 1.4; opacity: .62; transition: opacity .5s var(--ease), stroke .5s, stroke-width .5s; }
.fan-line circle { fill: var(--bg); stroke: var(--line); stroke-width: 1.2; opacity: 0; transition: opacity .5s; }
.fan-line text { font: 400 15px/1 var(--sans); fill: var(--ink-2); transition: opacity .5s; }
.fan-line .yr { opacity: 0; }
.fan-line .nm { opacity: .9; }
.fan-line.is-on path { opacity: 1; stroke: var(--ink); stroke-width: 2; }
.fan-line.is-on circle { opacity: 1; stroke: var(--ink); }
.fan-line.is-on circle:last-of-type { fill: var(--gold); stroke: var(--gold-ink); }
.fan-line.is-on .yr { opacity: 1; fill: var(--ink); }
.fan-line.is-on .nm { opacity: 1; fill: var(--ink); font-weight: 600; }
.fan-bird { fill: var(--gold); --wing: var(--wing-gold); }
.fan-origin svg { fill: var(--bird); }
.track-panels { margin-top: 18px; }
.track-lead { font: 500 21px/1.5 var(--head); }
.years { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line-soft); }
.years li { display: flex; flex-direction: column; gap: 4px; }
.years b { font: 600 21px/1.3 var(--head); letter-spacing: .02em; margin-bottom: 6px; }
.years span { font-size: 15px; color: var(--ink-2); line-height: 1.7; }
.track-extra { display: flex; gap: 20px; margin-top: 24px; padding-top: 18px; border-top: 1px dashed rgba(140, 131, 120, .45); font-size: 15px; color: var(--ink-2); }
.track-extra b { flex: none; color: var(--ink); font-weight: 600; }
.dual { display: grid; grid-template-columns: 4fr 7fr; gap: 64px; margin-top: 96px; padding-top: 48px; border-top: 1px dashed rgba(140, 131, 120, .5); }
.dual-text h3 { font: 600 26px/1.45 var(--head); letter-spacing: .02em; }
.dual-text p { margin-top: 14px; color: var(--ink-2); }
.dual-shared { display: flex; align-items: baseline; gap: 16px; padding: 14px 22px; border-radius: 999px; background: rgba(213, 154, 62, .14); }
.dual-shared b { font: 600 18px/1 var(--head); }
.dual-shared small { margin-left: auto; font-size: 13px; color: var(--ink-2); }
.dual-split { position: relative; display: grid; gap: 14px; margin: 18px 0 0 40px; padding-left: 26px; border-left: 1.4px dashed var(--line); }
.dual-line { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 18px; font-size: 15px; color: var(--ink-2); }
.dual-line b { flex: 0 0 132px; font-size: 15px; font-weight: 600; color: var(--ink); }
.dual-line.is-main b { color: var(--gold-ink); }
.dual-line span::before { content: "·"; margin-right: 8px; color: var(--line); }
.dual-note { margin-top: 22px; max-width: 36em; font-size: 15px; }
.dual-more { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 18px; font-size: 15px; color: var(--ink-2); }
.dual-more i { font-style: normal; padding: 3px 12px; border-radius: 99px; box-shadow: inset 0 0 0 1px var(--line-soft); color: var(--ink); }

/* ---------- 5 六大能力底座：六块立在沙色地平线上 ---------- */
.base { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(6, 1fr); margin-top: 64px; }
.base li { display: flex; flex-direction: column; gap: 14px; padding: 0 16px 26px 0; }
.base li + li { padding-left: 20px; border-left: 1px solid var(--line-soft); }
.base span { font: 400 15px/1 var(--serif); color: var(--ink-2); letter-spacing: .1em; }
.base b { font: 600 clamp(18px, 1.35vw, 20px)/1.35 var(--head); letter-spacing: .02em; white-space: nowrap; }
.base li:last-child span { color: var(--gold-ink); }
.base-ground { width: 100%; height: 70px; margin-top: -34px; }

/* ---------- 6 具体怎么做：卡片排成 V 字两翼 ---------- */
.vee { position: relative; height: 800px; margin-top: 56px; }
.job { position: absolute; width: 240px; padding: 18px 0 0; border-top: 1px solid var(--line-soft); }
.job::before { content: ""; position: absolute; left: 0; top: -7px; width: 30px; height: 13px; background: var(--bird);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 44'%3E%3Cpath d='M6 25C14 22 26 20.5 40 20.5 54 20.5 64 20 72 18.6L86 15.2C90 14.2 93.5 14 96 15L100 16.4 95.8 17.4C93 18 90.5 18.8 88 20L76 24.6C68 28.4 56 31 42 31 28 31 15 29 6 25Z'/%3E%3Cpath d='M57 21.5C49 12.5 37 4.5 14 .5 22 6.5 27 11.5 29.5 15 31 17.2 33 19.6 35 22Z'/%3E%3C/svg%3E") center/contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 44'%3E%3Cpath d='M6 25C14 22 26 20.5 40 20.5 54 20.5 64 20 72 18.6L86 15.2C90 14.2 93.5 14 96 15L100 16.4 95.8 17.4C93 18 90.5 18.8 88 20L76 24.6C68 28.4 56 31 42 31 28 31 15 29 6 25Z'/%3E%3Cpath d='M57 21.5C49 12.5 37 4.5 14 .5 22 6.5 27 11.5 29.5 15 31 17.2 33 19.6 35 22Z'/%3E%3C/svg%3E") center/contain no-repeat; }
.job h3 { font: 600 26px/1.3 var(--head); letter-spacing: .02em; }
.job p { margin-top: 8px; font-size: 15px; line-height: 1.7; color: var(--ink); }
.job small { display: block; margin-top: 10px; font-size: 15px; color: var(--gold-ink); font-weight: 600; }
/* V 字：头在右，上翼往左上、下翼往左下 */
.job:nth-of-type(1) { left: 0; top: 0; }
.job:nth-of-type(2) { left: 256px; top: 76px; }
.job:nth-of-type(3) { left: 512px; top: 152px; }
.job:nth-of-type(4) { left: 768px; top: 228px; }
.job:nth-of-type(5) { left: 768px; top: 452px; }
.job:nth-of-type(6) { left: 512px; top: 528px; }
.job:nth-of-type(7) { left: 256px; top: 604px; }
.job:nth-of-type(8) { left: 0; top: 680px; }
.vee-child { position: absolute; left: 380px; top: 384px; display: flex; align-items: center; gap: 14px; }
.vee-child svg { width: 92px; height: 40px; fill: var(--gold); --wing: var(--wing-gold); transform: rotate(-6deg); }
.vee-child span { font: 600 21px/1 var(--head); color: var(--gold-ink); letter-spacing: .02em; }

/* ---------- 7 陪跑机制 + 给家长 ---------- */
.crew { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 44px; }
.crew li { display: grid; grid-template-columns: 64px 1fr; column-gap: 12px; align-items: baseline; }
.crew-n { grid-row: span 2; font: 400 64px/1 var(--serif); color: var(--ink); }
.crew li:first-child .crew-n { color: var(--gold-ink); }
.crew b { font: 600 21px/1.3 var(--head); letter-spacing: .02em; }
.crew p { font-size: 15px; color: var(--ink-2); text-wrap: balance; }
.parent { margin-top: 88px; max-width: 760px; }
.parent-title { font: 600 30px/1.45 var(--head); letter-spacing: .02em; }
.parent-title::first-line { color: var(--ink-2); }
.parent-then { margin-top: 18px; font-size: 18px; line-height: 1.9; color: var(--ink-2); }

/* ---------- 8 目标可以变：在校准环处转向 ---------- */
.turn { position: relative; margin-top: 40px; }
.turn svg { width: 100%; height: auto; overflow: visible; }
.turn-old { fill: none; stroke: var(--line); stroke-width: 1; opacity: .45; }
.turn-done { fill: none; stroke: var(--gold); stroke-width: 4; stroke-linecap: round; }
.turn-new { fill: none; stroke: var(--ink); stroke-width: 1.8; stroke-linecap: round; }
.turn-ring { fill: var(--bg); stroke: var(--gold-ink); stroke-width: 2; }
.turn-end.old { fill: none; stroke: var(--line); stroke-width: 1.4; opacity: .55; }
.turn-end.new { fill: var(--bg); stroke: var(--ink); stroke-width: 2; }
.turn-bird { fill: var(--bird); }
.turn-tag { position: absolute; font-size: 15px; color: var(--ink-2); white-space: nowrap; }
.turn-tag b { color: var(--ink); font-weight: 600; }
.t-done { left: 6.5%; top: 76%; }
.t-ring { left: 39%; top: 80%; color: var(--gold-ink); }
.t-new { left: 66%; top: 6%; }
.t-old { left: 76%; top: 76%; }

/* ---------- 保研标签页里的八个学期 ---------- */
.terms { margin-top: 26px; }
.terms summary { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; list-style: none; font-size: 15px; font-weight: 600; }
.terms summary::-webkit-details-marker { display: none; }
.terms summary::after { content: "+"; display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--ink); font-weight: 400; transition: transform .3s var(--click); }
.terms[open] summary::after { transform: rotate(45deg); }
.log-grid { display: grid; grid-template-columns: repeat(8, 1fr); margin-top: 20px; border-top: 1px solid var(--line-soft); }
.log-grid li { display: flex; flex-direction: column; gap: 2px; padding: 16px 12px 18px 0; }
.log-grid b { font: 600 15px/1.3 var(--head); letter-spacing: .02em; margin-bottom: 6px; }
.log-grid span { font-size: 15px; line-height: 1.6; color: var(--ink-2); }
.terms-note { margin-top: 6px; font-size: 13px; color: var(--ink-2); }

/* ---------- 10 学生案例 ---------- */
.story { display: grid; grid-template-columns: 3fr 9fr; gap: 56px; margin-top: 52px; }
.story-who { display: flex; flex-direction: column; gap: 14px; }
.story-who > div { display: flex; flex-direction: column; }
.story-who b { font: 600 26px/1.3 var(--head); letter-spacing: .02em; }
.story-who span { font-size: 15px; color: var(--ink-2); }
.story-n { font: 400 72px/1 var(--serif); color: var(--gold-ink); margin-top: 8px; }
.story-n small { font-size: 18px; color: var(--ink); }
.story-years { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.story-years li { display: flex; flex-direction: column; gap: 4px; padding-top: 14px; border-top: 1.6px solid var(--ink); }
.story-years li:last-child { border-top-color: var(--gold); }
.story-years b { font: 600 18px/1.3 var(--head); letter-spacing: .02em; }
.story-years span { font-size: 15px; color: var(--ink-2); }
.story-through { display: grid; gap: 8px; margin-top: 28px; }
.story-through p { display: flex; align-items: center; gap: 16px; font-size: 15px; color: var(--ink-2); }
.story-through b { flex: 0 0 72px; color: var(--ink); font-weight: 600; }
.offers { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 16px; margin-top: 32px; }
.offers li { display: flex; flex-direction: column; gap: 2px; padding: 16px 0 0; border-top: 1px solid var(--line-soft); }
.offers b { font: 600 21px/1.3 var(--head); letter-spacing: .02em; }
.offers i { font-style: normal; font-size: 13px; letter-spacing: .12em; color: var(--ink-2); }
.offers li > span { font-size: 13px; color: var(--ink-2); letter-spacing: .1em; }
.offers .is-chosen > span { color: var(--gold-ink); }
.offers .is-chosen { border-top: 3px solid var(--gold); }

/* ---------- 12 服务方案：一张航程对照，覆盖哪几年一眼看出 ---------- */
.plans { --cols: 260px repeat(5, 1fr) 150px; margin-top: 52px; }
.plans-head, .plan { display: grid; grid-template-columns: var(--cols); column-gap: 0; align-items: center; }
.plans-head { padding-bottom: 12px; border-bottom: 1px solid var(--line-soft); font: 600 15px/1 var(--head); letter-spacing: .02em; color: var(--ink-2); }
.plans-head span { padding-left: 2px; }
.plans-head span:first-child { grid-column: 2; }
.plans-head span:nth-child(5) { color: var(--gold-ink); }
.plan { padding: 30px 0; border-bottom: 1px solid var(--line-soft); }
.plan-name h3 { font: 600 26px/1.3 var(--head); letter-spacing: .02em; }
.plan-name h3 em { font: 400 15px/1 var(--sans); font-style: normal; color: var(--gold-ink); letter-spacing: .12em; vertical-align: middle; margin-left: 8px; }
.plan-name p { margin-top: 4px; font-size: 15px; color: var(--ink-2); text-wrap: balance; }
.plan-bar { grid-column: 2 / 7; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.plan-bar::before { content: ""; grid-column: 1 / -1; grid-row: 1; height: 34px; background: repeating-linear-gradient(90deg, rgba(231, 220, 205, .5) 0 calc(20% - 6px), transparent calc(20% - 6px) 20%); border-radius: 999px; }
.plan-bar i { grid-column: var(--a) / var(--b); grid-row: 1; height: 34px; margin-right: 6px; padding: 0 14px; display: flex; align-items: center; border-radius: 999px; background: var(--hill); font-style: normal; font-size: 15px; color: var(--ink); white-space: nowrap; overflow: hidden; }
.plan-main .plan-bar i { background: var(--ink); color: var(--bg); }
.plan-bar i.sprint { background: transparent; box-shadow: inset 0 0 0 1.6px var(--gold); color: var(--gold-ink); font-size: 13px; padding: 0 10px; }
.plan .btn { justify-self: end; height: 44px; padding: 0 22px; font-size: 15px; }
.plan-main .plan-name h3 { font-size: 30px; }
.plans-note { margin-top: 28px; font: 500 18px/1.6 var(--head); }

/* ---------- 13 加入流程 + 预约 ---------- */
.join { display: grid; grid-template-columns: 6fr 5fr; gap: 64px; margin-top: 48px; align-items: start; }
.join-flock svg { width: 100%; height: auto; overflow: visible; }
.join-flock .trail { opacity: .7; }
.join-flock use { fill: var(--bird); }
.join-flock .slot { color: var(--gold-ink); fill: none; transition: opacity .4s; }
.join-flock .slot-fill { fill: var(--gold); --wing: var(--wing-gold); opacity: 0; }
.join-flock .node-n { font: 700 14px/1 var(--serif); fill: var(--ink); }
.join-flock .slot-tag { fill: none; stroke: var(--gold-ink); stroke-width: 1; }
.join-flock .slot-lbl { font: 400 15px/1 var(--sans); fill: var(--gold-ink); }
.join-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.join-steps li { display: flex; flex-direction: column; gap: 8px; }
.join-steps span { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--ink); font: 700 14px/1 var(--serif); }
.join-steps small { font-size: 13px; color: var(--ink-2); }
.join-steps li:last-child span { box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--ink); }
.join-steps .is-now span { background: var(--gold); border-color: var(--gold-ink); color: var(--ink); }
.join-steps .is-now small { color: var(--gold-ink); }
.join-steps .is-done span { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.join-steps small:empty { display: none; }
.nav-book { display: none; }
.join-steps b { font: 600 18px/1.35 var(--head); letter-spacing: .02em; }
.gift { display: inline-flex; margin-top: 34px; padding: 10px 20px; border-radius: 999px; background: rgba(213, 154, 62, .12); color: #7E5115; font-size: 15px; }
.book-card { padding: 26px 0 0; border-top: 1.6px solid var(--ink); }
.form { display: grid; gap: 20px; }
.field { display: grid; gap: 8px; border: 0; margin: 0; padding: 0; min-width: 0; }
.field label, .field legend { padding: 0; font-size: 15px; font-weight: 600; }
.field label em { font-style: normal; font-weight: 400; color: var(--ink-2); font-size: 13px; margin-left: 6px; }
.field legend { margin-bottom: 8px; }
.field input[type="text"], .field input[type="tel"] { height: 48px; padding: 0 2px; border: 0; border-bottom: 1px solid rgba(45, 41, 37, .28); border-radius: 0; background: transparent; font-size: 17px; transition: border-color .25s, box-shadow .25s; }
.field input::placeholder { color: #A39A8F; }
.field input:focus { outline: none; border-color: var(--ink); box-shadow: 0 1.4px 0 var(--gold); }
.field.has-error input { border-color: #B0563E; }
.err { display: none; font-size: 15px; color: #A24B34; }
.field.has-error .err { display: block; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { position: relative; cursor: pointer; }
.chips input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: pointer; }
.chips span { display: inline-flex; align-items: center; height: 40px; padding: 0 16px; border-radius: 999px; box-shadow: inset 0 0 0 1px rgba(45, 41, 37, .18); font-size: 15px; transition: background-color .25s, color .25s, transform .3s var(--click); }
.chips input:checked + span { background: var(--ink); color: var(--bg); box-shadow: none; }
.chips input:focus-visible + span { outline: 2px solid var(--gold-ink); outline-offset: 3px; }
.chips input:active + span { transform: scale(.95); }
.btn.is-busy { pointer-events: none; opacity: .7; }
.form-error { padding: 12px 16px; border-radius: 12px; background: #FBF0EB; color: #A24B34; font-size: 15px; }
.form-error a { text-decoration: underline; }
.plan-pick { display: flex; align-items: center; gap: 10px; margin: -4px 0 0; padding: 10px 14px; border-radius: 12px; background: rgba(213, 154, 62, .12); font-size: 15px; }
.plan-pick b { color: var(--gold-ink); }
.plan-pick button { margin-left: auto; padding: 4px 10px; border: 0; border-radius: 99px; background: none; font-size: 13px; color: var(--ink-2); text-decoration: underline; cursor: pointer; }
.success { padding: 28px 0 8px; }
.success:focus { outline: none; }
.success h3 { font: 600 26px/1.4 var(--head); letter-spacing: .02em; }
.success p { margin-top: 12px; color: var(--ink-2); }
.success .btn { margin-top: 26px; }

/* ---------- 页脚 ---------- */
.footer { position: relative; margin-top: 24px; padding-bottom: 36px; }
.footer-sky { width: 100%; height: 220px; }
.footer-sky .flock use { fill: var(--line); --wing: #B5AC9F; }
.footer-sky .flock .is-child { fill: var(--gold); --wing: var(--wing-gold); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr auto; gap: 48px; align-items: end; margin-top: 24px; }
.footer-title { font: 700 clamp(30px, 3.6vw, 48px)/1.3 var(--serif); letter-spacing: .1em; }
.footer-sub { margin-top: 8px; font-size: 13px; letter-spacing: .22em; color: var(--ink-2); }
.contact { display: grid; gap: 10px; font-size: 15px; }
.contact div { display: grid; grid-template-columns: 52px 1fr; }
.contact dt { color: var(--ink-2); }
.qr { display: grid; justify-items: center; gap: 8px; margin: 0; text-align: center; }
.qr img { display: block; width: 128px; height: 128px; padding: 6px; border-radius: 12px; background: #fff; box-shadow: 0 0 0 1px var(--line-soft); }
.qr figcaption { font-size: 13px; line-height: 1.5; color: var(--ink-2); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 52px; padding-top: 20px; border-top: 1px solid var(--line-soft); font-size: 13px; color: var(--ink-2); }

/* ---------- 窄屏 ---------- */
@media (max-width: 1080px) {
  :root { --nav-h: 66px; }
  .nav-toggle { display: block; }
  .nav-menu { position: fixed; inset: var(--nav-h) 0 auto; flex-direction: column; align-items: stretch; gap: 18px; padding: 10px var(--gutter) 26px;
    background: rgba(251, 248, 243, .96); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); box-shadow: 0 1px 0 var(--line-soft), 0 24px 40px -28px rgba(59, 54, 49, .4);
    opacity: 0; visibility: hidden; transform: translateY(-10px); transition: opacity .3s var(--ease), transform .4s var(--ease), visibility 0s .4s; }
  .nav.is-open .nav-menu { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }
  .nav.is-open { background: rgba(251, 248, 243, .96); }
  .nav-menu ul { flex-direction: column; gap: 0; font-size: 17px; }
  .nav-menu ul a { display: block; padding: 14px 2px; border-bottom: 1px solid var(--line-soft); }
  .nav-menu ul a::after { display: none; }
  .nav-menu .btn { height: 50px; font-size: 15px; }
  .vee { height: auto; display: grid; grid-template-columns: 1fr 1fr; gap: 34px 28px; }
  .job { position: relative; left: auto !important; top: auto !important; width: auto; }
  /* 窄屏：金雁放在八件事中间，前四件在前、后四件在后，仍是“被护在队伍中间” */
  .vee-child { position: static; grid-column: 1 / -1; justify-self: center; order: 1; padding: 6px 0; }
  .job:nth-of-type(n+5) { order: 2; }
  .dual, .join, .story, .portal-peek { grid-template-columns: 1fr; gap: 36px; }
  .worries li { gap: 12px 36px; }
  .nav-login { display: block; margin: 0; padding: 14px 2px; border-bottom: 1px solid var(--line-soft); font-size: 17px; }
  /* 雁阵紧挨着表单：提交后金雁入列和成功文字在同一屏 */
  .join-left { display: contents; }
  .join-steps { order: 1; } .gift { order: 2; justify-self: start; } .join-flock { order: 3; max-width: 520px; margin: 0 -8px -18px; } .book-card { order: 4; }
  .log-grid { grid-template-columns: repeat(4, 1fr); row-gap: 8px; }
  .plans { --cols: 200px repeat(5, 1fr) 132px; }
  .base { grid-template-columns: repeat(3, 1fr); row-gap: 28px; }
  .base li:nth-child(4) { padding-left: 0; border-left: 0; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-motto { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  .brand b { font-size: 21px; }
  .nav-inner { gap: 10px; }
  .nav-inner .brand { margin-right: auto; }
  .nav-book { display: inline-flex; height: 38px; padding: 0 14px; font-size: 15px; opacity: 0; pointer-events: none; transition: opacity .3s; }
  .nav.is-scrolled .nav-book { opacity: 1; pointer-events: auto; }
  .hero { height: 140vh; }
  .hero-wide { display: none; } .hero-tall { display: block; }
  .hero-copy { left: var(--gutter); right: var(--gutter); bottom: 9vh; }
  .hero-title { font-size: clamp(42px, 12.5vw, 56px); }
  .hero-sub { font-size: 15px; margin-top: 14px; }
  .br-wide { display: none; }
  .hero-cta { margin-top: 22px; }
  .hero-cta .btn { flex: 1 1 0; padding: 0 10px; height: 48px; font-size: 15px; }
  .tag { font-size: 13px; }
  .sec { padding-top: 76px; }
  .sec-title { font-size: 27px; }
  .sec-lead { font-size: 15px; }
  .worries { gap: 30px; margin-top: 36px; }
  .worries li { grid-template-columns: 1fr; }
  .worries q { font-size: 18px; padding-left: .55em; }
  .worries q::before { right: auto; left: -.05em; }
  .ans { grid-template-columns: 28px minmax(0, 1fr); gap: 10px; padding-top: 0; }
  .ans svg { width: 28px; height: 12px; }
  .ans p { font-size: 15px; color: var(--ink-2); }
  .worries-end { border-radius: 18px; font-size: 16px; padding: 14px 18px; }
  .sub, .sub-gap { margin-top: 80px; }
  .sub-title { font-size: 21px; }
  .rhythm-line { font-size: 15px; gap: 6px 14px; }
  .rhythm-line span + span::before { margin-right: 14px; }
  .peek-shot { padding: 20px 18px; }

  /* 2：五条航迹在手机上照样横排，文字在线上方 */
  .score { padding-left: 0; margin-top: 36px; }
  .score-head { font-size: 13px; letter-spacing: .08em; }
  .score-rows { gap: 26px; margin-top: 22px; }
  .score-row b { position: static; grid-column: 1 / -1; grid-row: 1; font-size: 17px; }
  .score-row span { grid-column: 1 / -1; grid-row: 2; font-size: 15px; }
  .leg-line { grid-row: 3; }
  .score-note { margin: 34px 0 0; font-size: 18px; gap: 12px; }
  .late-goose svg { width: 48px; height: 21px; }

  .route-wide { display: none; } .route-tall { display: block; width: 100%; max-width: 340px; margin: 0 auto; height: auto; overflow: visible; }
  .route-steps { grid-template-columns: 1fr; gap: 26px; }
  .route-steps h3 { font-size: 21px; margin-top: 10px; }

  .tabs { display: grid; grid-template-columns: repeat(3, 1fr); width: 100%; border-radius: 22px; }
  .tab { padding: 10px 6px; border-radius: 18px; }
  .tab-slider { border-radius: 18px; }
  .fan { display: none; }
  .track-panels { margin-top: 26px; }
  .track-lead { font-size: 18px; }
  .years { grid-template-columns: 1fr 1fr; gap: 20px 16px; padding: 0; border: 0; }
  .years li { padding-top: 12px; border-top: 1.6px solid var(--ink); }
  .years li:last-child { border-top-color: var(--gold); }
  .years b { font-size: 18px; margin-bottom: 2px; }
  .dual { margin-top: 64px; }
  .dual-text h3 { font-size: 21px; }
  .dual-shared { flex-wrap: wrap; border-radius: 18px; gap: 6px 12px; }
  .dual-shared small { margin-left: 0; }
  .dual-split { margin-left: 14px; padding-left: 18px; }
  .dual-line b { flex-basis: 100%; }

  .base { grid-template-columns: 1fr 1fr; margin-top: 40px; row-gap: 22px; }
  .base li, .base li + li { padding: 0 0 18px 16px; border-left: 1px solid var(--line-soft); }
  .base b { font-size: 18px; white-space: normal; }
  .base-ground { height: 48px; margin-top: -26px; }

  .vee { grid-template-columns: 1fr; gap: 30px; margin-top: 40px; }
  .job { padding: 18px 0 0; }
  .job h3 { font-size: 18px; }

  .crew { grid-template-columns: 1fr; gap: 18px; margin-top: 30px; }
  .crew-n { font-size: 52px; }
  .parent { margin-top: 72px; }
  .parent-title { font-size: 21px; }
  .parent-then { font-size: 15px; }

  .turn { margin: 30px -6px 0; }
  .turn-tag { position: static; display: block; margin-top: 6px; font-size: 15px; }
  .turn-tag::before { content: ""; display: inline-block; width: 10px; height: 10px; margin-right: 8px; border-radius: 50%; vertical-align: middle; }
  .t-done::before { background: var(--gold); } .t-ring::before { border: 2px solid var(--gold-ink); } .t-new::before { border: 1.8px solid var(--ink); } .t-old::before { border: 1px solid var(--line); opacity: .6; }

  .log-grid { grid-template-columns: 1fr 1fr; column-gap: 16px; }
  .log-grid li { padding: 14px 0 14px; border-bottom: 1px solid var(--line-soft); }

  .story { gap: 26px; margin-top: 36px; }
  .story-who { flex-direction: row; align-items: center; flex-wrap: wrap; gap: 14px 16px; }
  .story-n { margin: 0 0 0 auto; font-size: 52px; }
  .story-years { grid-template-columns: 1fr 1fr; gap: 18px 16px; }
  .story-through p { border-radius: 14px; align-items: flex-start; flex-direction: column; gap: 2px; }
  .story-through b { flex: none; }
  .offers { grid-template-columns: 1fr; gap: 10px; }

  .plans-head { display: grid; grid-template-columns: repeat(5, 1fr); font-size: 13px; letter-spacing: .04em; }
  .plans-head span:first-child { grid-column: 1; }
  .plan { grid-template-columns: 1fr auto; row-gap: 14px; padding: 24px 0; }
  .plan-bar { grid-column: 1 / -1; grid-row: 2; }
  .plan-bar i { height: 34px; font-size: 15px; padding: 0 12px; }
  .plan-bar i.short { font-size: 0; padding: 0; }
  .plan-bar i.sprint { font-size: 0; padding: 0; }
  .plan-bar i.sprint::after { content: "冲刺"; font-size: 13px; margin: auto; }
  .plan .btn { grid-column: 2; grid-row: 1; height: 40px; padding: 0 16px; }
  .plan-name h3, .plan-main .plan-name h3 { font-size: 21px; }
  .plans-note { font-size: 15px; }
  .track-extra { flex-direction: column; gap: 4px; }

  .join { gap: 30px; margin-top: 34px; }
  .join-steps { grid-template-columns: 1fr 1fr; gap: 18px 12px; }
  .join-steps b { font-size: 17px; }
  .book-card { padding: 22px 0 0; }
  .chips span { height: 38px; padding: 0 14px; font-size: 15px; }

  .footer { margin-top: 96px; }
  .footer-sky { height: 150px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; margin-top: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  .hero { height: auto; }
  .hero-stage { position: relative; }
  * { transition-duration: .01ms !important; animation: none !important; }
}