/* ==========================================================================
   赵曼辰 · 个人主页
   视觉参考：PRISM（Deep Navy & Gold 学术配色）+ esther-design-system（布局方法论）
   ========================================================================== */

:root {
  /* 底色：近纯白，论文纸感 */
  --paper:      #FDFDFD;
  --paper-alt:  #F5F6F7;
  --paper-warm: #FAFAFA;

  /* 文字：近黑，带极轻冷调，不用纯黑 */
  --ink:        #0A0C0F;
  --ink-soft:   #3F4750;
  --ink-faint:  #767E88;

  /* 强调：深石板灰蓝 */
  --accent:     #2E3A46;
  --accent-soft:#8A939E;

  --rule:       #E4E6E8;
  --rule-dark:  #C6CAD0;

  --serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans:  "Inter", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --w: 1040px;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html, body { max-width: 100%; overflow-x: clip; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
}

::selection { background: var(--ink); color: var(--paper); }

img { max-width: 100%; display: block; }

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--rule-dark);
  transition: border-color .2s ease, color .2s ease;
}
a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- 排版基础 ---------- */

.container {
  width: 100%;
  max-width: var(--w);
  margin: 0 auto;
  padding: 0 clamp(22px, 5vw, 52px);
}

.section { padding: clamp(64px, 9vh, 116px) 0; }

.eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin: 0 0 1.1em;
  font-weight: 500;
  text-transform: uppercase;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(1.42rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.01em;
  margin: 0 0 clamp(24px, 3.2vw, 36px);
}

h3 {
  font-family: var(--serif);
  font-size: clamp(1.02rem, 1.8vw, 1.16rem);
  font-weight: 600;
  line-height: 1.6;
  margin: 0 0 0.55em;
}

p { margin: 0 0 1.25em; }
p:last-child { margin-bottom: 0; }

.lead {
  font-size: 1.02rem;
  color: var(--ink-soft);
  line-height: 1.9;
}

.strong-line {
  font-family: var(--serif);
  font-size: clamp(1.06rem, 2.2vw, 1.24rem);
  line-height: 1.85;
  color: var(--ink);
}

.mark {
  background-color: rgba(46, 58, 70, 0.09);
}

.hairline { height: 1px; background: var(--rule); border: 0; margin: 0; }

/* ---------- 图片位（放图自动生效，无图显示占位） ---------- */

.photo-frame {
  position: relative;
  margin: 0;
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  overflow: hidden;
}

.photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.photo-ph {
  display: none;
  position: absolute;
  inset: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  text-align: center;
  padding: 12px;
  background:
    repeating-linear-gradient(45deg, transparent 0 7px, rgba(15,23,42,0.02) 7px 8px),
    var(--paper-alt);
  border: 1px dashed var(--rule-dark);
}

.photo-frame.is-empty .photo-ph { display: flex; }

.ph-idx {
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.ph-label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.ph-hint {
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  line-height: 1.6;
}

.ratio-1-1  { aspect-ratio: 1 / 1; }
.ratio-4-3  { aspect-ratio: 4 / 3; }
.ratio-3-2  { aspect-ratio: 3 / 2; }
.ratio-16-10{ aspect-ratio: 16 / 10; }

.photo-caption {
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  margin-top: 10px;
}

/* ---------- 01 Hero（学术主页版：左像右文） ---------- */

.hero {
  padding: clamp(56px, 9vh, 96px) 0 clamp(48px, 7vh, 80px);
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
  position: relative;
  z-index: 2;
}

.hero-portrait {
  width: 100%;
}

.hero-portrait .photo-frame { aspect-ratio: 3 / 4; }

.hero-info { padding-top: 6px; }

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.04em;
  margin: 0 0 0.3em;
}

.hero-role {
  font-size: 0.94rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin: 0 0 1.6em;
}

.hero-quote {
  font-family: var(--serif);
  font-size: clamp(1.04rem, 2.2vw, 1.22rem);
  line-height: 1.85;
  color: var(--ink);
  letter-spacing: 0.02em;
  margin: 0 0 clamp(28px, 4vh, 40px);
  padding-left: 18px;
  border-left: 2px solid var(--accent-soft);
  max-width: min(26em, 100%);
}

/* 学术信息表 */
.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 7px clamp(16px, 2.4vw, 30px);
  font-size: 0.84rem;
  line-height: 1.7;
  max-width: 560px;
}

.facts dt {
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.facts dd {
  margin: 0;
  color: var(--ink-soft);
}

.facts dd b { color: var(--ink); font-weight: 500; }

/* Hero 装饰线 */
.hero-motif {
  position: absolute;
  right: -6vw;
  top: 50%;
  transform: translateY(-50%);
  width: clamp(340px, 40vw, 540px);
  opacity: 0.04;
  pointer-events: none;
  z-index: 1;
}

/* ---------- 02 故事 ---------- */

.story-layout {
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: clamp(32px, 5.5vw, 76px);
  align-items: start;
}

.story-nav {
  position: sticky;
  top: clamp(64px, 10vh, 92px);
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.story-nav button {
  appearance: none;
  background: none;
  border: 0;
  border-left: 1px solid var(--rule);
  padding: 7px 0 7px 13px;
  text-align: left;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  transition: color .25s ease, border-color .25s ease;
}

.story-nav button:hover { color: var(--ink-soft); }

.story-nav button.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.story-nav .idx {
  font-family: var(--serif);
  font-size: 0.8rem;
  margin-right: 7px;
  opacity: 0.7;
}

.story-item {
  padding-bottom: clamp(38px, 5.5vw, 58px);
  margin-bottom: clamp(38px, 5.5vw, 58px);
  border-bottom: 1px solid var(--rule);
}
.story-item:last-child { border-bottom: 0; margin-bottom: 0; padding-bottom: 0; }

.story-item p { color: var(--ink-soft); }
.story-item p.first { color: var(--ink); }

.story-time {
  font-family: var(--serif);
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.9em;
  font-variant-numeric: tabular-nums;
}

.story-big {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2.6vw, 1.5rem);
  line-height: 1.7;
  color: var(--ink);
  font-weight: 600;
  margin: 0 0 1em;
}

/* 故事内嵌图 */
.story-figure {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
}

.story-figure .photo-frame { aspect-ratio: 11 / 10; }

/* 照片组（北大生活） */
.photo-set {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(12px, 1.8vw, 18px);
  margin: clamp(26px, 3.6vw, 36px) 0 0;
}

.photo-set .photo-frame { aspect-ratio: 4 / 3; }

.photo-set .photo-frame.is-wide {
  grid-column: 1 / -1;
  aspect-ratio: 16 / 9;
}

.photo-set-note {
  grid-column: 1 / -1;
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  line-height: 1.7;
  margin: 0;
}

/* ---------- 02 履历 ---------- */

.cv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
}

.cv-col {
  border-top: 2px solid var(--ink);
  padding-top: clamp(14px, 2vw, 18px);
}

.cv-col h3 {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin: 0;
  text-transform: uppercase;
}

.cv-item { margin-top: clamp(14px, 2vw, 20px); }

.cv-main {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  margin: 0;
  line-height: 1.6;
}

.cv-sub {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 2px 0 0;
  line-height: 1.7;
}

.cv-date {
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin: 3px 0 0;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 04 培养计划 ---------- */

.program-lead {
  font-family: var(--serif);
  font-size: clamp(1.08rem, 2.4vw, 1.3rem);
  line-height: 1.95;
  color: var(--ink);
  max-width: 30em;
  margin: 0 0 1.05em;
  text-wrap: pretty;
}

.program-pivot {
  font-family: var(--serif);
  font-size: clamp(1.18rem, 2.9vw, 1.55rem);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  padding-top: clamp(20px, 2.6vw, 28px);
  border-top: 1px solid var(--rule);
}

.module-block { margin-top: clamp(34px, 4.6vw, 56px); }

.module-title {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--accent);
  text-transform: uppercase;
  margin: 0 0 12px;
}

.module-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 clamp(26px, 4vw, 56px);
  max-width: 700px;
}

.module-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dotted var(--rule-dark);
  font-size: 0.9rem;
  line-height: 1.5;
}

.m-name { color: var(--ink-soft); }
.m-fill { flex: 1; min-width: 12px; }

.m-num {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.program-goal {
  margin-top: clamp(30px, 4vw, 44px);
  font-family: var(--serif);
  font-size: clamp(1rem, 2.2vw, 1.14rem);
  line-height: 1.85;
  color: var(--ink);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule);
}

.program-goal strong { font-weight: 600; }

.program-close {
  margin-top: clamp(24px, 3.2vw, 34px);
  color: var(--ink-soft);
  max-width: 36em;
}

.program-tail {
  margin-top: clamp(26px, 3.4vw, 38px);
  font-family: var(--serif);
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  font-weight: 600;
  color: var(--ink);
}


.photo-slider {
  display: flex;
  gap: clamp(10px, 1.6vw, 14px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 10px;
  margin: clamp(26px, 3.6vw, 36px) 0 0;
  scrollbar-width: thin;
}
.photo-slider::-webkit-scrollbar { height: 2px; }
.photo-slider::-webkit-scrollbar-thumb { background: var(--rule-dark); }
.photo-slider .photo-frame {
  flex: 0 0 calc(50% - 7px);
  aspect-ratio: 2 / 3;
  scroll-snap-align: start;
}

/* ---------- 03 地图 ---------- */

.map-layout {
  display: grid;
  grid-template-columns: 0.78fr 1fr;
  gap: clamp(32px, 6vw, 84px);
  align-items: center;
}

.map-figure {
  border-top: 2px solid var(--ink);
  padding-top: clamp(18px, 2.6vw, 24px);
}

.map-number {
  font-family: var(--serif);
  font-size: clamp(3.2rem, 9vw, 6.4rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.01em;
  display: block;
  font-variant-numeric: tabular-nums;
}

.map-unit {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
  margin-top: 12px;
}

.map-body p { color: var(--ink-soft); }
.map-body .strong-line { color: var(--ink); }

/* ---------- 04 三个标记 ---------- */

.marks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 38px);
}

.mark-card {
  border-top: 1px solid var(--rule-dark);
  padding-top: clamp(16px, 2.2vw, 22px);
}

.mark-idx {
  display: block;
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 12px;
}

.mark-card h3 { margin-bottom: 0.6em; }

.mark-card p {
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.85;
}

.mark-wide {
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--paper-alt);
  padding: clamp(24px, 3.4vw, 38px);
}

.mark-wide h3 { margin-bottom: 0.5em; }
.mark-wide p { color: var(--ink-soft); font-size: 0.9rem; }

/* 资料下载条 */
.doc-row {
  margin-top: clamp(26px, 3.6vw, 40px);
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
}

.doc-label {
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.doc-link {
  font-family: var(--serif);
  font-size: clamp(0.96rem, 1.9vw, 1.06rem);
  font-weight: 600;
  border-bottom: 1px solid var(--accent-soft);
}

.doc-sep { color: var(--rule-dark); }

/* ---------- 05 方法 ---------- */

.steps {
  position: relative;
  padding-left: clamp(40px, 5.4vw, 56px);
}

.steps::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--rule);
}

.step {
  position: relative;
  padding-bottom: clamp(28px, 3.8vw, 42px);
}
.step:last-child { padding-bottom: 0; }

.step-num {
  position: absolute;
  left: calc(clamp(40px, 5.4vw, 56px) * -1);
  top: 0;
  width: 35px;
  height: 35px;
  border: 1px solid var(--rule-dark);
  border-radius: 50%;
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
}

.step h3 { margin-bottom: 0.45em; }
.step p { color: var(--ink-soft); font-size: 0.9rem; max-width: 34em; }

/* ---------- 06 行程 ---------- */

.trip-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 32px);
}

.trip-hint {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.trip-scroll {
  display: flex;
  gap: clamp(12px, 1.8vw, 18px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 18px;
  -webkit-overflow-scrolling: touch;
}

.trip-scroll::-webkit-scrollbar { height: 2px; }
.trip-scroll::-webkit-scrollbar-track { background: var(--rule); }
.trip-scroll::-webkit-scrollbar-thumb { background: var(--accent-soft); }

.trip-card {
  flex: 0 0 clamp(200px, 24vw, 248px);
  scroll-snap-align: start;
  border-top: 2px solid var(--ink);
  padding-top: clamp(16px, 2.2vw, 22px);
}

.trip-card .phase {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  display: block;
  margin-bottom: 12px;
}

.trip-card .hours {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 600;
  line-height: 1;
  display: block;
  font-variant-numeric: tabular-nums;
}

.trip-card .hours small {
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-left: 5px;
}

.trip-card p {
  margin-top: 12px;
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.8;
}

.trip-note {
  margin-top: clamp(22px, 3vw, 34px);
  font-family: var(--serif);
  font-size: clamp(0.98rem, 2vw, 1.1rem);
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 07 FAQ ---------- */

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(296px, 1fr));
  gap: clamp(18px, 2.6vw, 30px);
}

.faq-item { border-top: 1px solid var(--rule); padding-top: clamp(16px, 2.2vw, 22px); }

.faq-item h3 {
  font-family: var(--sans);
  font-size: 0.94rem;
  font-weight: 500;
  margin-bottom: 0.55em;
}

.faq-item p { color: var(--ink-soft); font-size: 0.88rem; line-height: 1.85; }

/* ---------- 08 联系 ---------- */

.contact {
  text-align: center;
  padding: clamp(72px, 11vh, 132px) 0;
  border-top: 1px solid var(--rule);
}

.contact .eyebrow { margin-bottom: 1.4em; }

.contact-line {
  font-family: var(--serif);
  font-size: clamp(1.16rem, 2.8vw, 1.6rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  line-height: 1.8;
}

.contact-email {
  font-family: var(--serif);
  font-size: clamp(1.02rem, 2.4vw, 1.24rem);
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}

.contact-note {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--rule);
  padding: clamp(26px, 4vw, 40px) 0 clamp(32px, 5vw, 48px);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  line-height: 1.9;
}

.footer-inner a { border-bottom-color: var(--rule); }

/* ---------- 动效 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .7s cubic-bezier(.22,.61,.36,1), transform .7s cubic-bezier(.22,.61,.36,1);
}
.reveal.in { opacity: 1; transform: none; }

.reveal-d1 { transition-delay: .07s; }
.reveal-d2 { transition-delay: .14s; }

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 132px 1fr;
    gap: 22px;
  }
  .hero h1 { font-size: clamp(1.9rem, 6.5vw, 2.4rem); }
  .facts { grid-template-columns: 1fr; gap: 2px; }
  .facts dt { margin-top: 6px; }

  .story-layout { grid-template-columns: 1fr; }
  .story-nav {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0 14px;
    padding-bottom: 7px;
    border-bottom: 1px solid var(--rule);
    margin-bottom: 26px;
  }
  .story-nav button {
    border-left: 0;
    border-bottom: 1px solid transparent;
    padding: 5px 0;
    margin-bottom: -1px;
  }
  .story-nav button.active { border-bottom-color: var(--accent); }

  .cv-grid { grid-template-columns: 1fr 1fr; }
  .map-layout { grid-template-columns: 1fr; gap: 26px; }
  .marks-grid { grid-template-columns: 1fr; gap: 26px; }

  .steps { padding-left: 36px; }
  .steps::before { left: 13px; }
  .step-num { left: -36px; width: 29px; height: 29px; font-size: 0.72rem; }

  .hero-motif { opacity: 0.03; right: -20vw; }
}

@media (max-width: 600px) {
  body { font-size: 15px; }
  .photo-slider .photo-frame { flex: 0 0 74%; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-portrait { max-width: 168px; }
  .hero-portrait .photo-frame { aspect-ratio: 3 / 4; }
  .hero-quote { padding-left: 14px; }
  .cv-grid { grid-template-columns: 1fr; }
  .photo-set { grid-template-columns: 1fr; }
  .trip-card { flex-basis: 74vw; }
  .faq-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 5px; }
  .doc-row { gap: 6px 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

@media print {
  .hero-motif, .story-nav, .trip-hint { display: none; }
  .section { padding: 26px 0; }
  body { background: #fff; }
  .photo-frame { break-inside: avoid; }
}