/* ============================================================
   航空发动机课题组 · 对外展示页 科技风设计系统
   深蓝夜空基底 + 霓虹青/尾焰橙 + 玻璃拟态 + 滚动联动
   ============================================================ */

:root {
  --bg: #04070f;
  --bg-2: #070d1c;
  --ink: #e8f1ff;
  --muted: #8ea3c4;
  --cyan: #22d3ee;
  --cyan-soft: rgba(34, 211, 238, .14);
  --blue: #3b82f6;
  --flame: #ff6b35;
  --line: rgba(120, 170, 255, .12);
  --glass: rgba(13, 24, 46, .55);
  --glass-brd: rgba(120, 180, 255, .16);
  --radius: 18px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.pub {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.75;
  overflow-x: hidden;
  animation: pageIn .7s ease both;
}

@keyframes pageIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

::selection { background: rgba(34, 211, 238, .35); }

/* ---------- 全局背景层：星空粒子 + 网格 + 光晕 ---------- */
#bg-stars {
  position: fixed; inset: 0; z-index: -3;
  width: 100%; height: 100%;
}

body.pub::before {           /* 科技网格 */
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    linear-gradient(rgba(80, 140, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(80, 140, 255, .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 100%);
}

body.pub::after {            /* 顶部极光光晕 */
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(ellipse 55% 40% at 18% -5%, rgba(34, 211, 238, .16), transparent 65%),
    radial-gradient(ellipse 50% 38% at 85% 0%, rgba(59, 130, 246, .14), transparent 65%),
    radial-gradient(ellipse 40% 30% at 60% 110%, rgba(255, 107, 53, .07), transparent 70%);
}

/* ---------- 顶部导航 ---------- */
.pub-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 56px); height: 68px;
  transition: background .35s, box-shadow .35s, backdrop-filter .35s;
}

.pub-nav.scrolled {
  background: rgba(5, 10, 22, .78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line), 0 12px 40px rgba(0, 0, 0, .45);
}

.pub-nav .brand {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--ink);
}

.pub-nav .brand svg { width: 34px; height: 34px; filter: drop-shadow(0 0 8px rgba(34, 211, 238, .6)); }

.pub-nav .brand b { font-size: 16px; letter-spacing: .06em; display: block; line-height: 1.25; }

.pub-nav .brand small {
  display: block; font-family: var(--mono); font-size: 10px;
  letter-spacing: .32em; color: var(--cyan); text-transform: uppercase;
}

.pub-nav .links { display: flex; align-items: center; gap: 6px; }

.pub-nav .links a {
  position: relative; padding: 8px 16px; border-radius: 99px;
  color: var(--muted); text-decoration: none; font-size: 14px; letter-spacing: .04em;
  transition: color .25s, background .25s;
}

.pub-nav .links a:hover { color: var(--ink); background: rgba(120, 170, 255, .08); }

.pub-nav .links a.active { color: var(--cyan); }

.pub-nav .links a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 2px; height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 10px var(--cyan);
}

.pub-nav .links a.entry {
  margin-left: 10px; color: #031018; font-weight: 600;
  background: linear-gradient(120deg, var(--cyan), #60a5fa);
  box-shadow: 0 0 18px rgba(34, 211, 238, .4);
}

.pub-nav .links a.entry:hover { background: linear-gradient(120deg, #67e8f9, #93c5fd); color: #031018; }

/* ---------- 首页 Hero ---------- */
.hero {
  min-height: 100vh;
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  align-items: center; gap: clamp(24px, 4vw, 64px);
  padding: 120px clamp(20px, 6vw, 80px) 80px;
  position: relative;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .3em;
  color: var(--cyan); text-transform: uppercase;
  padding: 7px 16px; border: 1px solid rgba(34, 211, 238, .35); border-radius: 99px;
  background: var(--cyan-soft);
  box-shadow: inset 0 0 18px rgba(34, 211, 238, .12);
}

.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan);
  animation: blink 1.8s ease-in-out infinite;
}

@keyframes blink { 50% { opacity: .25; } }

.hero h1 {
  margin: 26px 0 20px;
  font-size: clamp(38px, 5.4vw, 68px); line-height: 1.16;
  letter-spacing: .02em; font-weight: 800;
}

.grad {
  background: linear-gradient(100deg, #67e8f9 5%, #3b82f6 48%, #a78bfa 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(59, 130, 246, .35));
}

.hero .lead { max-width: 560px; color: var(--muted); font-size: 16px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.btn-glow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 12px; text-decoration: none;
  font-size: 15px; font-weight: 600; letter-spacing: .04em;
  transition: transform .25s, box-shadow .25s, background .25s, border-color .25s;
}

.btn-glow.primary {
  color: #031018;
  background: linear-gradient(120deg, var(--cyan), #60a5fa);
  box-shadow: 0 8px 30px rgba(34, 211, 238, .35);
}

.btn-glow.primary:hover { transform: translateY(-3px); box-shadow: 0 14px 42px rgba(34, 211, 238, .5); }

.btn-glow.ghost {
  color: var(--ink); border: 1px solid var(--glass-brd);
  background: rgba(120, 170, 255, .05);
}

.btn-glow.ghost:hover { transform: translateY(-3px); border-color: rgba(34, 211, 238, .55); box-shadow: 0 0 24px rgba(34, 211, 238, .18); }

.hero-hint { margin-top: 22px; font-size: 12.5px; color: var(--muted); opacity: .75; font-family: var(--mono); letter-spacing: .05em; }

/* 3D 发动机舞台 */
.hero-engine { position: relative; }

.engine-stage {
  position: relative; height: clamp(380px, 58vh, 560px);
  border-radius: 24px;
}

.engine-stage::before {       /* 舞台光环 */
  content: ""; position: absolute; inset: -1px; border-radius: 24px; pointer-events: none;
  background: radial-gradient(ellipse 60% 55% at 50% 50%, rgba(34, 211, 238, .1), transparent 70%);
}

.engine-stage canvas { width: 100%; height: 100%; display: block; cursor: pointer; }

.engine-stage .big-fan {
  position: absolute; inset: 0; margin: auto;
  width: min(78%, 440px); height: auto;
  animation: fanSpin 14s linear infinite;
  filter: drop-shadow(0 0 24px rgba(34, 211, 238, .35));
}

@keyframes fanSpin { to { transform: rotate(360deg); } }

/* 下滑提示 */
.scroll-cue {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--muted); font-family: var(--mono); font-size: 10px; letter-spacing: .34em;
  text-transform: uppercase;
}

.scroll-cue i {
  width: 1px; height: 44px; overflow: hidden; position: relative;
  background: rgba(120, 170, 255, .2);
}

.scroll-cue i::after {
  content: ""; position: absolute; left: 0; top: -50%; width: 100%; height: 50%;
  background: linear-gradient(180deg, transparent, var(--cyan));
  animation: cueDrop 1.8s ease-in-out infinite;
}

@keyframes cueDrop { to { top: 110%; } }

/* ---------- 子页页头 ---------- */
.page-hero {
  min-height: 62vh; display: flex; flex-direction: column;
  justify-content: center; align-items: flex-start;
  padding: 150px clamp(20px, 6vw, 80px) 70px;
  position: relative; max-width: 1200px; margin: 0 auto;
}

.page-hero h1 {
  margin: 24px 0 16px;
  font-size: clamp(34px, 4.6vw, 58px); font-weight: 800; line-height: 1.2; letter-spacing: .02em;
}

.page-hero .lead { max-width: 620px; color: var(--muted); font-size: 16px; }

.page-hero .scroll-cue { left: auto; right: clamp(20px, 6vw, 80px); transform: none; }

/* ---------- 连贯滚动分区（纵向能量线串联） ---------- */
.flow {
  position: relative; max-width: 1200px; margin: 0 auto;
  padding: 20px clamp(20px, 6vw, 80px) 40px;
}

.flow::before {               /* 贯穿全页的能量线 */
  content: ""; position: absolute; top: 0; bottom: 0;
  left: calc(clamp(20px, 6vw, 80px) + 13px);
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(34, 211, 238, .4) 8%, rgba(59, 130, 246, .35) 55%, rgba(255, 107, 53, .3) 92%, transparent);
  box-shadow: 0 0 14px rgba(34, 211, 238, .35);
}

.flow-section {
  position: relative; padding: 64px 0 64px 64px;
}

.flow-section::before {       /* 节点光环 */
  content: ""; position: absolute; left: 4px; top: 86px;
  width: 19px; height: 19px; border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--bg);
  box-shadow: 0 0 0 5px rgba(34, 211, 238, .12), 0 0 18px rgba(34, 211, 238, .55);
}

.flow-section::after {
  content: ""; position: absolute; left: 9.5px; top: 92px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 12px var(--cyan);
}

.sec-head { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; margin-bottom: 28px; }

.sec-index {
  font-family: var(--mono); font-size: 13px; letter-spacing: .2em;
  color: var(--flame); text-shadow: 0 0 14px rgba(255, 107, 53, .6);
}

.sec-head h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 750; letter-spacing: .02em; }

.sec-head .count {
  font-family: var(--mono); font-size: 13px; color: var(--muted);
  padding: 3px 12px; border: 1px solid var(--line); border-radius: 99px;
}

.sec-desc { max-width: 640px; color: var(--muted); font-size: 15px; margin: -14px 0 28px; }

/* ---------- 玻璃面板 / 卡片 ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-brd);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 18px 50px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(160, 200, 255, .08);
}

.panel { padding: clamp(24px, 3.4vw, 44px); }

.panel p + p { margin-top: 12px; }

.panel .muted { color: var(--muted); }

.panel a { color: var(--cyan); }

/* 研究方向卡片 */
.dir-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }

.dir-card {
  padding: 26px 24px; border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--glass-brd);
  position: relative; overflow: hidden;
  transition: transform .3s, border-color .3s, box-shadow .3s;
}

.dir-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0; transition: opacity .3s;
}

.dir-card:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, .45); box-shadow: 0 20px 46px rgba(0, 0, 0, .5), 0 0 30px rgba(34, 211, 238, .12); }

.dir-card:hover::before { opacity: 1; }

.dir-card .ico { font-size: 26px; margin-bottom: 12px; filter: drop-shadow(0 0 10px rgba(34, 211, 238, .5)); }

.dir-card h3 { font-size: 17px; margin-bottom: 8px; }

.dir-card p { font-size: 13.5px; color: var(--muted); }

/* 统计带 */
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 18px; }

.stat {
  text-align: center; padding: 30px 16px;
  border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--glass-brd);
}

.stat b {
  display: block; font-family: var(--mono);
  font-size: clamp(30px, 3.6vw, 44px); font-weight: 700;
  background: linear-gradient(120deg, #67e8f9, #60a5fa);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: none;
}

.stat span { font-size: 13px; color: var(--muted); letter-spacing: .1em; }

/* 成员卡片 */
.member-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }

.member-card {
  padding: 22px; border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--glass-brd);
  transition: transform .3s, border-color .3s, box-shadow .3s;
  position: relative; overflow: hidden;
}

.member-card::after {
  content: ""; position: absolute; right: -30px; top: -30px;
  width: 90px; height: 90px; border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 211, 238, .16), transparent 70%);
}

.member-card:hover { transform: translateY(-5px); border-color: rgba(34, 211, 238, .5); box-shadow: 0 16px 40px rgba(0, 0, 0, .5), 0 0 26px rgba(34, 211, 238, .12); }

.member-card .name { font-size: 17px; font-weight: 700; letter-spacing: .04em; }

.member-card .year {
  font-family: var(--mono); font-size: 12px; color: var(--cyan);
  margin: 4px 0 8px; letter-spacing: .08em;
}

.member-card .research { font-size: 13px; color: var(--muted); }

/* 成果数据行 */
.rowline {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 20px;
  align-items: baseline;
  padding: 16px 20px; border-radius: 12px;
  border: 1px solid transparent;
  transition: background .25s, border-color .25s, transform .25s;
}

.rowline + .rowline { margin-top: 6px; }

.rowline:hover {
  background: rgba(34, 211, 238, .06);
  border-color: rgba(34, 211, 238, .25);
  transform: translateX(6px);
}

.rowline .t { font-size: 15px; font-weight: 600; }

.rowline .v { font-size: 13px; color: var(--muted); }

.rowline .d {
  font-family: var(--mono); font-size: 13px; color: var(--cyan);
  white-space: nowrap; letter-spacing: .05em;
}

.chip {
  display: inline-block; padding: 2px 12px; border-radius: 99px;
  font-size: 12px; font-family: var(--mono);
  border: 1px solid rgba(34, 211, 238, .4); color: var(--cyan);
  background: var(--cyan-soft);
}

.chip.orange { border-color: rgba(255, 107, 53, .45); color: var(--flame); background: rgba(255, 107, 53, .1); }

/* 动态时间轴 */
.timeline { position: relative; }

.news-node {
  position: relative; padding: 26px 28px; margin-bottom: 18px;
  border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--glass-brd);
  transition: transform .3s, border-color .3s, box-shadow .3s;
}

.news-node:hover { transform: translateY(-4px); border-color: rgba(34, 211, 238, .4); box-shadow: 0 16px 40px rgba(0, 0, 0, .45); }

.news-node .date {
  font-family: var(--mono); font-size: 12px; color: var(--flame);
  letter-spacing: .12em; margin-bottom: 8px;
}

.news-node h3 { font-size: 18px; margin-bottom: 8px; }

.news-node p { font-size: 14px; color: var(--muted); white-space: pre-wrap; }

/* 首页动态简表 */
.news-item {
  display: flex; justify-content: space-between; align-items: baseline; gap: 18px;
  padding: 15px 18px; border-radius: 12px;
  transition: background .25s, transform .25s;
}

.news-item + .news-item { border-top: 1px solid var(--line); }

.news-item:hover { background: rgba(34, 211, 238, .06); transform: translateX(6px); }

.news-item a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px; }

.news-item a:hover { color: var(--cyan); }

.news-item .date { font-family: var(--mono); font-size: 12.5px; color: var(--muted); white-space: nowrap; }

/* 快速入口 */
.portal-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }

.portal {
  display: block; padding: 30px 26px; border-radius: var(--radius);
  background: var(--glass); border: 1px solid var(--glass-brd);
  text-decoration: none; color: var(--ink);
  position: relative; overflow: hidden;
  transition: transform .3s, border-color .3s, box-shadow .3s;
}

.portal::after {
  content: "→"; position: absolute; right: 22px; top: 24px;
  font-size: 20px; color: var(--cyan);
  transition: transform .3s;
}

.portal:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, .5); box-shadow: 0 20px 46px rgba(0, 0, 0, .5), 0 0 30px rgba(34, 211, 238, .12); }

.portal:hover::after { transform: translateX(6px); }

.portal h3 { font-size: 18px; margin-bottom: 8px; }

.portal p { font-size: 13.5px; color: var(--muted); }

.empty {
  padding: 34px; text-align: center; color: var(--muted);
  border: 1px dashed var(--glass-brd); border-radius: var(--radius);
  font-family: var(--mono); font-size: 13px; letter-spacing: .1em;
}

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .8s cubic-bezier(.2, .65, .3, 1), transform .8s cubic-bezier(.2, .65, .3, 1); }

.reveal.in { opacity: 1; transform: none; }

/* ---------- 页脚 ---------- */
.pub-footer {
  margin-top: 60px; padding: 44px clamp(20px, 6vw, 80px) 36px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, rgba(8, 14, 30, .9));
  text-align: center;
}

.pub-footer .foot-brand {
  font-family: var(--mono); font-size: 12px; letter-spacing: .3em;
  color: var(--cyan); text-transform: uppercase; margin-bottom: 10px;
}

.pub-footer p { font-size: 13px; color: var(--muted); }

.pub-footer .foot-links { margin-top: 14px; display: flex; justify-content: center; gap: 22px; flex-wrap: wrap; }

.pub-footer .foot-links a { color: var(--muted); text-decoration: none; font-size: 13px; transition: color .25s; }

.pub-footer .foot-links a:hover { color: var(--cyan); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 110px; text-align: center; }
  .hero .lead { margin: 0 auto; }
  .hero-actions { justify-content: center; }
  .engine-stage { height: 340px; }
  .pub-nav .links a { padding: 8px 10px; font-size: 13px; }
  .pub-nav .links a.entry { display: none; }
  .flow::before { left: calc(clamp(20px, 6vw, 80px) + 8px); }
  .flow-section { padding-left: 40px; }
  .flow-section::before { left: 0; width: 15px; height: 15px; }
  .flow-section::after { left: 4.5px; width: 6px; height: 6px; }
  .page-hero .scroll-cue { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}