/* ============================================================
   toklight 托卡光源 · 官网样式
   暖纸底色 / 墨蓝正文 / 细线 / 大留白 / 单紫主色 + 青红点缀
   ============================================================ */

:root {
  --bg:          #f6f5f1;
  --bg-soft:     #eeefeb;
  --text:        #132640;
  --text-2:      #627087;
  --text-3:      #9db0c1;
  --line:        #ccd1d4;
  --line-soft:   #e5e7e5;
  --violet:      #8063c7;
  --violet-soft: #a78fd9;
  --aqua:        #69b8b5;
  --aqua-soft:   #9ad9d5;
  --red:         #b52b48;
  --navy:        #071a30;
  --nav-h:       110px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI",
          -apple-system, "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background .3s linear;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

::selection { background: var(--violet); color: #fff; }

.container { width: min(1120px, 90%); margin: 0 auto; }

/* ---------- 通用板块 ---------- */
.section { padding: 120px 0; border-top: 1px solid var(--line-soft); }

.sec-head {
  display: flex; align-items: baseline; gap: 20px;
  margin-bottom: 20px;
}
.sec-index {
  font-size: 14px; letter-spacing: 0.3em; font-weight: 600;
  color: var(--violet); white-space: nowrap;
}
.sec-title {
  font-size: clamp(30px, 3.8vw, 44px);
  font-weight: 700; letter-spacing: 0.01em;
}
.sec-lead {
  color: var(--text-2); font-size: 18.5px;
  max-width: 760px; margin-bottom: 72px;
}

/* ---------- 渐入动画（有 JS 时才先隐藏） ---------- */
.reveal { transition: opacity .7s ease, transform .7s ease; }
.js .reveal { opacity: 0; transform: translateY(22px); }
.js .reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal, .js .reveal.visible { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   导航
   ============================================================ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(246, 245, 241, 0.88);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  width: min(1240px, 93%); margin: 0 auto; height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo { display: inline-flex; align-items: center; }
.nav-logo img { height: 86px; width: auto; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text-2);
  border-radius: 6px;
  transition: color .25s;
  position: relative;
}
.nav-link .en {
  display: block;
  font-size: 9.5px; letter-spacing: 0.22em;
  color: var(--text-3);
  line-height: 1.3;
  transition: color .25s;
}
.nav-link:hover { color: var(--text); }
.nav-link:hover .en { color: var(--violet); }
.nav-link.active { color: var(--text); }
.nav-link.active .en { color: var(--violet); }
.nav-link.active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 1.5px; background: var(--violet);
}
.nav-cta {
  margin-left: 12px;
  border: 1px solid var(--text);
  border-radius: 999px;
  padding: 9px 22px;
  color: var(--text);
  transition: background .25s, color .25s;
}
.nav-cta .en { color: var(--text-3); }
.nav-cta:hover { background: var(--text); color: #fff; }
.nav-cta:hover .en { color: rgba(255, 255, 255, 0.65); }
.nav-cta.active::after { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  width: 22px; height: 1.5px; background: var(--text);
  transition: transform .3s, opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--nav-h) + 48px) 0 100px;
  overflow: hidden;
}
.hero-inner {
  width: min(1240px, 93%); margin: 0 auto;
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  align-items: center; gap: 64px;
}

.hero-eyebrow {
  font-size: 13.5px; letter-spacing: 0.38em; font-weight: 600;
  color: var(--violet); margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(46px, 6vw, 74px);
  line-height: 1.25; font-weight: 800;
  letter-spacing: 0.02em; margin-bottom: 28px;
}
.hero-title em { font-style: normal; color: var(--violet); }
.hero-sub {
  color: var(--text-2); font-size: 18px;
  max-width: 560px; margin-bottom: 44px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 52px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 34px; border-radius: 999px;
  font-size: 15.5px; font-weight: 600; letter-spacing: 0.04em;
  transition: background .25s, color .25s, border-color .25s, transform .25s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--text); color: #fff; }
.btn-primary:hover { background: var(--violet); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--text); }

.hero-badges {
  display: flex; gap: 26px; flex-wrap: wrap; list-style: none;
}
.hero-badges li {
  font-size: 11.5px; letter-spacing: 0.22em; font-weight: 600;
  color: var(--text-3);
  padding-left: 14px; position: relative;
}
.hero-badges li::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--violet); transform: translateY(-50%);
}

.hero-scroll {
  position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%);
  font-size: 11px; letter-spacing: 0.32em; color: var(--text-3);
  text-align: center; transition: color .25s;
}
.hero-scroll:hover { color: var(--violet); }
.hero-scroll i { display: block; font-style: normal; margin-top: 8px; animation: bob 2s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(5px); } }

/* ---------- Hero 插画 ---------- */
.hero-visual { margin: 0; min-width: 0; }
.hero-visual img {
  display: block; width: 100%; height: auto;
  /* 图片白底已在素材层面烘焙为暖纸白（assets/tokamak-paper.png），此处仅软化最外圈边缘 */
  mask-image: radial-gradient(ellipse 92% 90% at 50% 50%, #000 84%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 92% 90% at 50% 50%, #000 84%, transparent 100%);
}

/* ---------- 板块头与说明 ---------- */
.section-heading {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 28px; flex-wrap: wrap;
  margin-bottom: 56px;
}
.section-heading .sec-head { margin-bottom: 0; }
.section-note {
  max-width: 400px;
  color: var(--text-2); font-size: 15.5px;
  margin: 0;
}
.section-bottom {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 24px; flex-wrap: wrap;
  margin-top: 44px;
}
.note { color: var(--text-3); font-size: 13.5px; margin: 0; }
.section-soft { background: var(--bg-soft); }

/* ---------- 工作原理：横向四步 ---------- */
.how-steps {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.how-step { padding: 34px 28px 22px 0; }
.how-step + .how-step { padding-left: 28px; border-left: 1px solid var(--line); }
.step-number {
  display: block;
  color: var(--violet);
  font-size: 13px; letter-spacing: 0.08em; font-weight: 600;
  margin-bottom: 26px;
}
.how-step h3 { font-size: 21px; margin: 0 0 12px; }
.how-step p { font-size: 15.5px; color: var(--text-2); margin: 0; }

/* ---------- 团队与联系 ---------- */
.team-intro { margin-bottom: 26px; }
.team-copy {
  color: var(--text-2); font-size: 16.5px;
  max-width: 640px;
  margin: 0 0 46px;
}
.partners {
  display: flex; flex-wrap: wrap; gap: 16px 34px;
  align-items: baseline;
  margin: 0 0 48px;
  font-size: 17.5px; font-weight: 600;
}
.partners-label { font-size: 12px; font-weight: 500; letter-spacing: 0.2em; color: var(--text-3); }

/* ============================================================
   01 技术方案（悬停展开细节）
   ============================================================ */
.tech-list { border-top: 1px solid var(--line); }
.tech-item {
  display: grid; grid-template-columns: 132px 1fr;
  gap: 32px; align-items: start;
  padding: 40px 8px 44px;
  border-bottom: 1px solid var(--line);
  transition: background .3s, padding-left .3s;
  outline: none;
}
.tech-item:hover, .tech-item:focus-visible { background: var(--bg-soft); padding-left: 20px; }
.tech-side { display: flex; flex-direction: column; gap: 18px; }
.tech-num {
  font-size: 17px; font-weight: 700; letter-spacing: 0.1em;
  color: var(--violet);
}
.tech-svg { width: 84px; height: 84px; color: #3d4f66; }
.tech-body h3 {
  font-size: 21.5px;
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  margin-bottom: 14px;
}
.tech-en {
  font-size: 10.5px; letter-spacing: 0.2em; font-weight: 500;
  color: var(--text-3);
}
.tech-flag {
  font-size: 11.5px; font-weight: 600;
  color: var(--violet);
  border: 1px solid rgba(124, 92, 252, 0.4);
  border: 1px solid color-mix(in srgb, var(--violet) 40%, transparent);
  border-radius: 999px; padding: 1px 12px;
}
.tech-formula {
  font-size: 16px; color: var(--text); font-weight: 600;
  margin-bottom: 6px;
}
.tech-formula b { color: var(--violet); font-weight: 700; padding: 0 2px; }
.tech-desc { color: var(--text-2); font-size: 15.5px; }

/* 能力指标行（并入各技术条目） */
.tech-cap {
  display: flex; align-items: baseline; gap: 12px;
  margin-top: 14px; padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 15px; color: var(--text); font-weight: 600;
}
.tech-cap-label {
  font-size: 10px; letter-spacing: 0.22em; font-weight: 600;
  color: var(--violet); white-space: nowrap;
}

.cap-title {
  font-size: 12px; letter-spacing: 0.28em; font-weight: 600;
  color: var(--violet); padding-top: 6px; line-height: 2;
}

/* ---------- 技术优势（WHY TOKAMAK） ---------- */
.why-block { margin-top: 96px; }
.why-block > .cap-title { margin-bottom: 32px; }
.why-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  transition: background .3s linear;
}
.why-item {
  padding: 44px 38px 48px;
  transition: background .3s;
}
.why-item:not(:last-child) { border-right: 1px solid var(--line); }
.why-item:hover { background: rgba(0, 0, 0, 0.03); }
.why-num {
  font-size: 13px; font-weight: 700; letter-spacing: 0.14em;
  color: var(--violet); margin-bottom: 26px;
}
.why-svg {
  width: 88px; height: 88px;
  color: #3d4f66;
  margin-bottom: 30px;
}
.why-item h3 { font-size: 21.5px; margin-bottom: 12px; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.why-en {
  font-size: 10.5px; letter-spacing: 0.2em; font-weight: 500;
  color: var(--text-3);
}
.why-item p:last-child { color: var(--text-2); font-size: 15.5px; }

/* ============================================================
   02 工程规划
   ============================================================ */
.timeline {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px;
  position: relative; padding-top: 36px;
}
.timeline::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0;
  height: 1px; background: var(--line);
}
.tl-item { position: relative; }
.tl-item::before {
  content: ""; position: absolute; top: -36px; left: 0;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--violet);
  transform: translateY(-4px);
}
.tl-phase {
  font-size: 12px; letter-spacing: 0.22em; font-weight: 700;
  color: var(--violet); margin-bottom: 14px;
}
.tl-item h3 { font-size: 21.5px; margin-bottom: 10px; line-height: 1.5; }
.tl-item > p { color: var(--text-2); font-size: 16px; }
.tl-tag {
  display: inline-block; margin-top: 16px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.08em;
  color: #fff; background: var(--text);
  border-radius: 999px; padding: 4px 14px;
}

/* ============================================================
   03 团队与合作伙伴
   ============================================================ */
.team-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  margin-bottom: 72px;
}
.team-item {
  padding: 40px 36px 44px;
  border-bottom: 1px solid var(--line);
  transition: background .3s;
}
.team-item:not(:last-child) { border-right: 1px solid var(--line); }
.team-item:hover { background: var(--bg-soft); }
.team-en {
  font-size: 11px; letter-spacing: 0.26em; font-weight: 600;
  color: var(--violet); margin-bottom: 12px;
}
.team-item h3 { font-size: 20px; margin-bottom: 10px; }
.team-item p:last-child { color: var(--text-2); font-size: 15.5px; }

.partner-block {
  display: flex; align-items: center; gap: 40px; flex-wrap: wrap;
  padding: 36px 0 0;
  border-top: 1px solid var(--line-soft);
}
.partner-title {
  font-size: 12px; letter-spacing: 0.28em; font-weight: 600;
  color: var(--text-3);
}
.partner-row { display: flex; gap: 48px; flex-wrap: wrap; }
.partner-logo { font-size: 19px; font-weight: 700; letter-spacing: 0.02em; }
.partner-logo span {
  display: block;
  font-size: 10px; letter-spacing: 0.26em; font-weight: 500;
  color: var(--text-3); margin-top: 2px;
}

/* ============================================================
   04 新闻
   ============================================================ */
.news-list { border-top: 1px solid var(--line); }
.news-item {
  display: grid; grid-template-columns: 200px 1fr auto;
  align-items: baseline; gap: 28px;
  padding: 26px 8px;
  border-bottom: 1px solid var(--line);
  transition: background .3s, padding-left .3s;
}
.news-item:hover { background: var(--bg-soft); padding-left: 20px; }
.news-cat {
  font-size: 11.5px; letter-spacing: 0.22em; font-weight: 600;
  color: var(--violet);
}
.news-item h3 { font-size: 18px; font-weight: 600; }
.news-date { font-size: 12px; letter-spacing: 0.14em; color: var(--text-3); white-space: nowrap; }

/* ============================================================
   05 联系我们（人才招聘 + 产业合作）
   ============================================================ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 28px;
}
.contact-card {
  position: relative;
  border: 1px solid var(--line);
  padding: 52px 48px 48px;
  transition: border-color .3s, transform .3s;
  cursor: pointer;
  outline: none;
}
.contact-card:focus-visible { border-color: var(--violet); }
.contact-card:hover { border-color: #b5bcc2; transform: translateY(-4px); }
.contact-card-dark {
  background: var(--navy); border-color: var(--navy);
  color: #fff;
}
.contact-card-dark:hover { border-color: #1c3353; }
.cc-arrow {
  position: absolute; top: 26px; right: 28px;
  font-size: 19px; color: var(--text-3);
  transition: color .3s, transform .3s;
}
.contact-card:hover .cc-arrow { color: var(--violet); transform: translate(3px, -3px); }
.contact-card-dark .cc-arrow { color: rgba(255, 255, 255, 0.5); }
.contact-card-dark:hover .cc-arrow { color: var(--violet-soft); }
.cc-index {
  font-size: 12px; letter-spacing: 0.26em; font-weight: 600;
  color: var(--violet); margin-bottom: 40px;
}
.contact-card h3 { font-size: 31px; font-weight: 700; margin-bottom: 16px; }
.cc-desc { color: var(--text-2); font-size: 16.5px; margin-bottom: 28px; max-width: 440px; }
.contact-card-dark .cc-desc { color: rgba(255, 255, 255, 0.72); }
.cc-tags {
  font-size: 13px; letter-spacing: 0.06em; color: var(--text-3);
  margin-bottom: 40px;
}
.contact-card-dark .cc-tags { color: rgba(255, 255, 255, 0.5); }
.cc-link {
  display: inline-block;
  font-size: 15.5px; font-weight: 600;
  padding-bottom: 3px;
  border-bottom: 1.5px solid var(--text);
  transition: color .25s, border-color .25s;
}
.cc-link:hover { color: var(--violet); border-bottom-color: var(--violet); }
.contact-card-dark .cc-link { border-bottom-color: #fff; }
.contact-card-dark .cc-link:hover { color: var(--violet-soft); border-bottom-color: var(--violet-soft); }

/* ============================================================
   页脚
   ============================================================ */
.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 72px 0 36px;
  transition: background .3s linear;
}
.footer-main {
  display: flex; justify-content: space-between; align-items: center;
  gap: 32px; flex-wrap: wrap;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
}
.footer-brand { display: inline-flex; align-items: center; }
.footer-brand img { height: 82px; width: auto; }
.footer-slogan {
  font-size: 16px; letter-spacing: 0.3em; line-height: 2.1;
  font-weight: 600;
  color: var(--text-3);
  text-align: right;
}
.footer-legal {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding-top: 28px;
  font-size: 13px; color: var(--text-3);
}

/* ============================================================
   右侧滑出联系面板
   ============================================================ */
.drawer-overlay {
  position: fixed; inset: 0; z-index: 150;
  background: rgba(7, 26, 48, 0.32);
  opacity: 0; pointer-events: none;
  transition: opacity .35s;
}
.drawer-overlay.open { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 200;
  width: min(440px, 92vw);
  background: #fff;
  box-shadow: -20px 0 60px rgba(0, 0, 0, 0.12);
  transform: translateX(102%);
  transition: transform .45s cubic-bezier(.22, .8, .3, 1);
  padding: 96px 48px 48px;
  overflow-y: auto;
}
.drawer.open { transform: none; }
.drawer-close {
  position: absolute; top: 20px; right: 22px;
  width: 40px; height: 40px;
  background: none; border: 0; cursor: pointer;
  font-size: 24px; font-weight: 300; line-height: 1;
  color: var(--text-2);
  transition: color .25s, transform .25s;
}
.drawer-close:hover { color: var(--text); transform: rotate(90deg); }
.drawer-en {
  font-size: 12px; letter-spacing: 0.3em; font-weight: 600;
  color: var(--violet); margin-bottom: 20px;
}
.drawer-title { font-size: 37px; font-weight: 700; margin-bottom: 20px; }
.drawer-desc { color: var(--text-2); font-size: 16.5px; margin-bottom: 36px; }
.drawer-line { height: 1px; background: var(--line); margin-bottom: 28px; }
.drawer-mail-label {
  font-size: 11.5px; letter-spacing: 0.24em; font-weight: 600;
  color: var(--text-3); margin-bottom: 8px;
}
.drawer-person {
  font-size: 18.5px; font-weight: 600; color: var(--text);
  margin-bottom: 24px;
}
.drawer-mail { font-size: 18.5px; font-weight: 600; color: var(--violet); margin-bottom: 20px; }
.drawer-note { font-size: 13px; color: var(--red); }

/* ============================================================
   多页：子页页头
   ============================================================ */
.page-hero {
  padding: calc(var(--nav-h) + 96px) 0 72px;
  border-bottom: 1px solid var(--line-soft);
}
.page-hero-title {
  font-size: clamp(40px, 5.4vw, 64px);
  font-weight: 800; letter-spacing: 0.02em; line-height: 1.25;
  margin: 22px 0;
}
.page-hero-title em { font-style: normal; color: var(--violet); }
.page-hero-lead {
  color: var(--text-2); font-size: 18px;
  max-width: 720px;
}

/* ============================================================
   首页：板块预览与 CTA
   ============================================================ */
.preview-head {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 24px; flex-wrap: wrap;
}
.more-link {
  font-size: 15px; font-weight: 600; color: var(--violet);
  white-space: nowrap;
  border-bottom: 1.5px solid transparent;
  transition: border-color .25s;
}
.more-link:hover { border-bottom-color: var(--violet); }

/* 首页技术亮点卡 */
.hl-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.hl-card {
  display: block;
  padding: 40px 36px 44px;
  border-bottom: 1px solid var(--line);
  transition: background .3s;
}
.hl-card:not(:last-child) { border-right: 1px solid var(--line); }
.hl-card:hover { background: var(--bg-soft); }
.hl-en { font-size: 11px; letter-spacing: 0.26em; font-weight: 600; color: var(--violet); margin-bottom: 12px; }
.hl-card h3 { font-size: 20px; margin-bottom: 10px; }
.hl-card p { color: var(--text-2); font-size: 15.5px; margin-bottom: 22px; }
.hl-arrow {
  display: inline-block;
  font-size: 17px; color: var(--text-3);
  transition: color .3s, transform .3s;
}
.hl-card:hover .hl-arrow { color: var(--violet); transform: translateX(6px); }

/* 首页 CTA 横幅 */
.cta-band {
  text-align: center;
  padding: 110px 0;
  border-top: 1px solid var(--line-soft);
}
.cta-band h2 {
  font-size: clamp(30px, 4vw, 46px); font-weight: 800;
  margin-bottom: 18px;
}
.cta-band h2 em { font-style: normal; color: var(--violet); }
.cta-band p { color: var(--text-2); font-size: 17.5px; margin-bottom: 40px; }

/* 新闻来源 */
.news-src {
  font-size: 13px; color: var(--text-3); letter-spacing: 0.04em;
  margin-top: 4px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 64px; }
  .hero-visual { max-width: 560px; }
  .how-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .how-step:nth-child(3) { border-left: 0; padding-left: 0; }
  .how-step:nth-child(n+3) { border-top: 1px solid var(--line); }
  .team-grid { grid-template-columns: 1fr; }
  .team-item:not(:last-child) { border-right: 0; }
  .timeline { grid-template-columns: 1fr; gap: 48px; padding-top: 0; padding-left: 24px; }
  .timeline::before { top: 0; bottom: 0; left: 0; right: auto; width: 1px; height: auto; }
  .tl-item::before { top: 8px; left: -24px; transform: translateX(-4px); }
  .news-item { grid-template-columns: 1fr; gap: 6px; }
  .contact-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .why-item:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--line); }
  .hl-grid { grid-template-columns: 1fr; }
  .hl-card:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--line); }
  .footer-main { flex-direction: column; align-items: flex-start; }
  .footer-slogan { text-align: left; }
}

@media (max-width: 720px) {
  .section { padding: 80px 0; }
  .nav-toggle { display: flex; }
  .nav-logo img { height: 62px; }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch;
    background: #fff;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 12px 5% 22px;
    gap: 2px;
    transform: translateY(-10px);
    opacity: 0; pointer-events: none;
    transition: opacity .25s, transform .25s;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-link { padding: 12px 10px; font-size: 16px; }
  .nav-link.active::after { display: none; }
  .nav-cta { margin: 8px 0 0; text-align: center; }
  .tech-item { grid-template-columns: 1fr; gap: 6px; padding: 26px 4px; }
  .tech-item:hover { padding-left: 4px; }
  .tech-hint { display: none; }
  .contact-card { padding: 40px 28px 36px; }
  .hero-scroll { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
}

/* ============================================================
   技术页：系统总览图
   ============================================================ */
.sys-plate {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 44px 48px 20px;
  margin: 0 0 28px;
}
.sys-plate svg { width: 100%; height: auto; display: block; }
.sys-caption {
  display: flex; justify-content: space-between; gap: 12px 24px; flex-wrap: wrap;
  font-size: 11.5px; letter-spacing: 0.18em; color: var(--text-3);
  border-top: 1px dashed var(--line);
  margin-top: 28px; padding-top: 16px; padding-bottom: 6px;
}
.sys-legend {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px 24px; list-style: none;
}
.sys-legend li {
  display: flex; align-items: baseline; gap: 10px;
  font-size: 14.5px; color: var(--text-2);
  border-top: 1px solid var(--line); padding-top: 12px;
}
.sys-legend b { color: var(--violet); font-size: 15px; }

/* ============================================================
   技术页：研发目标参数带
   ============================================================ */
.stat-band {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  background: var(--bg);
  margin-bottom: 24px;
}
.stat-item { padding: 42px 30px 38px; }
.stat-item:not(:last-child) { border-right: 1px solid var(--line); }
.stat-value {
  font-size: 32px; font-weight: 800; letter-spacing: 0.01em;
  color: var(--text); margin-bottom: 12px; line-height: 1.2;
}
.stat-value small {
  font-size: 15px; font-weight: 600;
  color: var(--violet); margin-left: 5px; letter-spacing: 0.04em;
}
.stat-label {
  font-size: 12px; letter-spacing: 0.2em; font-weight: 600;
  color: var(--violet); margin-bottom: 12px;
}
.stat-note { font-size: 13.5px; color: var(--text-2); line-height: 1.7; }

/* ============================================================
   技术页：四列优势
   ============================================================ */
.why-grid-4 { grid-template-columns: repeat(4, 1fr); }
.why-grid-4 .why-item { padding: 40px 30px 44px; }
.why-grid-4 .why-svg { width: 72px; height: 72px; margin-bottom: 24px; }

/* ============================================================
   技术页：时间轴明细
   ============================================================ */
.tl-detail { list-style: none; margin-top: 16px; }
.tl-detail li {
  position: relative;
  font-size: 14px; color: var(--text-2);
  padding: 8px 0 8px 18px;
  border-top: 1px dashed var(--line-soft);
}
.tl-detail li:first-child { border-top: 0; }
.tl-detail li::before {
  content: ""; position: absolute; left: 1px; top: 15px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--aqua);
}

/* ============================================================
   新闻页：分类筛选 + 左图右文新闻行（参照 startorus 格式）
   ============================================================ */
.news-tabs {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 44px;
}
.news-tab {
  border: 1px solid var(--line);
  background: none; border-radius: 999px;
  padding: 9px 22px;
  font-family: inherit; font-size: 14.5px; color: var(--text-2);
  cursor: pointer;
  transition: background .25s, color .25s, border-color .25s;
}
.news-tab:hover { border-color: var(--text-3); color: var(--text); }
.news-tab.active {
  background: var(--text); border-color: var(--text); color: #fff;
}
.news-rows { border-top: 1px solid var(--line); }
.news-row {
  display: grid; grid-template-columns: 264px 1fr;
  gap: 36px; align-items: center;
  padding: 34px 8px;
  border-bottom: 1px solid var(--line);
  transition: background .3s, padding-left .3s;
}
.news-row:hover { background: var(--bg-soft); padding-left: 20px; }
.news-row.hide { display: none; }
.news-thumb {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
}
.news-thumb svg { width: 74%; height: auto; color: #3d4f66; display: block; }
.news-row-body h3 { font-size: 20px; line-height: 1.55; margin-bottom: 10px; }
.news-excerpt { color: var(--text-2); font-size: 15px; margin-bottom: 18px; }
.news-meta {
  display: flex; align-items: baseline; gap: 10px 20px; flex-wrap: wrap;
}
.news-meta .news-src { margin-top: 0; }
.news-pending {
  font-size: 11.5px; letter-spacing: 0.14em; font-weight: 600;
  color: var(--text-3);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 3px 12px; white-space: nowrap;
}

/* ============================================================
   响应式：新增组件
   ============================================================ */
@media (max-width: 1024px) {
  .stat-band { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2) { border-right: 0; }
  .stat-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .why-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .why-grid-4 .why-item:nth-child(2) { border-right: 0; }
  .why-grid-4 .why-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .why-grid-4 .why-item:nth-child(3) { border-bottom: 0; }
  .news-row { grid-template-columns: 220px 1fr; gap: 26px; }
}

@media (max-width: 720px) {
  .sys-plate { padding: 24px 18px 12px; }
  .stat-band { grid-template-columns: 1fr; }
  .stat-item:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--line); }
  .why-grid-4 { grid-template-columns: 1fr; }
  .why-grid-4 .why-item:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--line); }
  .tech-item { grid-template-columns: 1fr; gap: 16px; padding: 30px 4px 34px; }
  .tech-item:hover { padding-left: 4px; }
  .tech-side { flex-direction: row; align-items: center; gap: 20px; }
  .tech-svg { width: 64px; height: 64px; }
  .news-row { grid-template-columns: 1fr; gap: 20px; padding: 26px 4px; }
  .news-row:hover { padding-left: 4px; }
  .news-thumb { aspect-ratio: 16 / 9; }
}