/* ============================================================
   AI赋能储能并网保护整定与选型虚拟仿真实验
   Institutional landing page · 2026
   ============================================================ */

:root {
  --navy: #071d33;
  --navy-2: #0a2a46;
  --navy-3: #0d3a59;
  --ink: #16324a;
  --ink-soft: #38536a;
  --muted: #6b8095;
  --muted-2: #8fa3b5;
  --teal: #0e8fa3;
  --teal-bright: #24b8c8;
  --teal-pale: #e9f7f9;
  --gold: #d99a28;
  --gold-soft: #f4c766;
  --paper: #f4f7fa;
  --line: #dbe6ef;
  --line-strong: #c4d5e2;
  --white: #ffffff;
  --shadow-sm: 0 8px 24px rgba(10, 42, 70, .06);
  --shadow-md: 0 18px 48px rgba(10, 42, 70, .11);
  --shadow-lg: 0 28px 80px rgba(4, 20, 34, .22);
  --serif: "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --container: 1180px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-open { overflow: hidden; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
p, h1, h2, h3, h4, figure, dl, dd, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }

::selection { background: #bdeef3; color: var(--navy); }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 16px;
  background: var(--navy);
  color: var(--white);
  transform: translateY(-160%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}

/* ---------- header ---------- */
.utility-bar {
  background: #041421;
  color: #8fa8b8;
  font-size: 12px;
  letter-spacing: .03em;
}
.utility-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 32px;
}
.utility-links {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #b4c8d5;
}
.utility-links a:hover { color: var(--gold-soft); }
.utility-links span { color: #3d5668; }

.masthead {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.masthead-inner {
  display: flex;
  align-items: center;
  gap: 22px;
  min-height: 94px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
.brand-logo { width: 56px; height: 56px; flex: 0 0 auto; }
.brand-copy { display: flex; flex-direction: column; min-width: 0; }
.brand-copy strong {
  color: var(--navy);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .01em;
}
.brand-copy em {
  margin-top: 3px;
  color: var(--teal);
  font-size: 11px;
  font-style: normal;
  font-weight: 500;
  letter-spacing: .2em;
}
.masthead-note {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-left: auto;
  padding-left: 28px;
  border-left: 1px solid var(--line);
  text-align: right;
}
.masthead-note span {
  color: var(--teal);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .14em;
}
.masthead-note b {
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--white);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: var(--navy);
  transition: transform .25s var(--ease), opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.main-nav {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--navy-2);
  box-shadow: 0 8px 24px rgba(4, 20, 34, .13);
}
.main-nav::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: rgba(255, 255, 255, .08);
}
.main-nav.is-scrolled { box-shadow: 0 12px 34px rgba(4, 20, 34, .24); }
.nav-inner {
  display: flex;
  align-items: stretch;
  min-height: 52px;
}
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0 17px;
  color: rgba(255, 255, 255, .78);
  font-size: 14px;
  white-space: nowrap;
  transition: color .2s, background .2s;
}
.nav-link::after {
  content: "";
  position: absolute;
  right: 17px;
  bottom: 0;
  left: 17px;
  height: 2px;
  background: var(--gold-soft);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .25s var(--ease);
}
.nav-link:hover,
.nav-link.is-active { color: var(--white); background: rgba(255, 255, 255, .035); }
.nav-link:hover::after,
.nav-link.is-active::after { transform: scaleX(1); }
.nav-platform {
  display: inline-flex;
  align-items: center;
  align-self: center;
  gap: 6px;
  height: 32px;
  margin-left: auto;
  padding: 0 15px;
  border: 1px solid rgba(244, 199, 102, .6);
  color: var(--gold-soft);
  font-size: 12.5px;
  transition: background .2s, color .2s;
}
.nav-platform:hover { background: var(--gold-soft); color: var(--navy); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 660px;
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
}
.hero-media,
.hero-shade { position: absolute; inset: 0; }
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.015);
}
.hero-shade {
  background:
    radial-gradient(ellipse at 50% 42%, rgba(8, 47, 69, .08), rgba(3, 17, 29, .55) 74%),
    linear-gradient(180deg, rgba(3, 17, 29, .66) 0%, rgba(3, 17, 29, .35) 42%, rgba(3, 17, 29, .88) 100%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 980px;
  padding: 94px 0 112px;
  text-align: center;
}
.hero-eyebrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #9ed9e2;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .18em;
}
.hero-eyebrow span {
  width: 34px;
  height: 1px;
  background: var(--gold-soft);
}
.hero h1 {
  margin-top: 22px;
  font-family: var(--serif);
  font-size: clamp(38px, 4.6vw, 58px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: .02em;
  text-shadow: 0 4px 34px rgba(0, 0, 0, .38);
}
.hero h1 em {
  color: #f7dc9b;
  font-style: normal;
}
.hero-lead {
  margin-top: 20px;
  color: #e4f4f6;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: .08em;
}
.hero-desc {
  max-width: 800px;
  margin: 14px auto 0;
  color: #bfd6e1;
  font-size: 13.5px;
  line-height: 1.95;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 30px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 24px;
  border: 1px solid transparent;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  transition: transform .2s var(--ease), background .2s, border-color .2s, color .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
  color: #172d3e;
  box-shadow: 0 10px 28px rgba(217, 154, 40, .2);
}
.btn-primary:hover { background: #ffdc93; border-color: #ffdc93; box-shadow: 0 14px 34px rgba(217, 154, 40, .28); }
.btn-ghost {
  border-color: rgba(255, 255, 255, .38);
  background: rgba(255, 255, 255, .04);
  color: var(--white);
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, .75); background: rgba(255, 255, 255, .1); }
.btn-outline {
  border-color: var(--teal);
  color: var(--teal);
  background: transparent;
}
.btn-outline:hover { background: var(--teal); color: var(--white); }
.btn-small { min-height: 40px; padding: 0 18px; font-size: 12.5px; }
.hero-stats {
  display: flex;
  justify-content: center;
  margin-top: 42px;
  border-top: 1px solid rgba(255, 255, 255, .17);
}
.hero-stats > div {
  min-width: 128px;
  padding: 20px 30px 0;
  border-right: 1px solid rgba(255, 255, 255, .13);
  text-align: center;
}
.hero-stats > div:last-child { border-right: 0; }
.hero-stats dt {
  color: var(--white);
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
}
.hero-stats dd {
  margin-top: 5px;
  color: #9fb9c7;
  font-size: 11px;
  letter-spacing: .14em;
}
.hero-scroll {
  position: absolute;
  right: 26px;
  bottom: 28px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, .44);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .18em;
  writing-mode: vertical-rl;
}
.hero-scroll span {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, .55), transparent);
}

/* ---------- quick links ---------- */
.quick-section { position: relative; z-index: 5; margin-top: -48px; }
.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  box-shadow: var(--shadow-md);
  border-top: 3px solid var(--teal);
}
.quick-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  min-height: 92px;
  padding: 18px 20px;
  border-right: 1px solid var(--line);
  transition: background .2s;
}
.quick-card:last-child { border-right: 0; }
.quick-card:hover { background: #f2fbfc; }
.quick-index {
  align-self: start;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
}
.quick-copy { display: flex; flex-direction: column; gap: 2px; }
.quick-copy b { color: var(--navy); font-size: 14px; }
.quick-copy em { color: var(--muted); font-size: 11px; font-style: normal; line-height: 1.55; }
.quick-arrow { color: var(--teal); font-size: 18px; transition: transform .2s; }
.quick-card:hover .quick-arrow { transform: translateX(4px); }

/* ---------- section framework ---------- */
.section { padding: 88px 0; }
.about { background: var(--white); }
.projects { background: var(--paper); }
.process { background: var(--white); }
.resources { background: var(--paper); }
.notices { background: var(--white); }

.section-head { max-width: 790px; margin-bottom: 46px; }
.section-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 48px;
  max-width: none;
}
.section-head-row .section-intro { max-width: 460px; margin-bottom: 5px; }
.section-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .18em;
}
.section-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--gold);
}
.section-head h2 {
  position: relative;
  margin-top: 12px;
  padding-bottom: 15px;
  color: var(--navy);
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .03em;
}
.section-head h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--gold);
}
.section-intro {
  margin-top: 17px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.95;
}
.section-head-compact { margin-bottom: 20px; }
.section-head-compact h2 { font-size: 30px; }

/* ---------- about ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 64px;
}
.about-copy .lead {
  color: var(--navy);
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.8;
}
.about-copy > p + p {
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 13.8px;
  line-height: 1.95;
}
.check-list {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.7;
}
.check-list span {
  flex: 0 0 auto;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.9;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--teal);
  color: var(--teal);
  font-size: 13px;
  font-weight: 600;
}
.text-link span { transition: transform .2s; }
.text-link:hover span { transform: translateX(4px); }

.about-figure { margin: 0; }
.figure-frame {
  position: relative;
  padding: 10px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
}
.figure-frame img { width: 100%; height: auto; }
.figure-tag {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 7px 12px;
  background: rgba(4, 20, 34, .84);
  color: #c8edf2;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .08em;
  backdrop-filter: blur(6px);
}
.about-figure figcaption {
  margin-top: 13px;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.75;
}

.data-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 62px;
  padding: 28px 0;
  background:
    linear-gradient(120deg, rgba(14, 143, 163, .13), transparent 48%),
    var(--navy);
  color: var(--white);
}
.data-band > div {
  padding: 0 30px;
  border-right: 1px solid rgba(255, 255, 255, .12);
}
.data-band > div:last-child { border-right: 0; }
.data-band span {
  display: block;
  color: #94b2c3;
  font-size: 10.5px;
  letter-spacing: .08em;
}
.data-band strong {
  display: block;
  margin-top: 7px;
  color: var(--white);
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
  line-height: 1.25;
}
.data-band small {
  margin-left: 4px;
  color: var(--gold-soft);
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
}
.data-band em {
  display: block;
  margin-top: 3px;
  color: #7694a8;
  font-size: 10.5px;
  font-style: normal;
}

/* ---------- project cards ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 330px;
  padding: 28px 26px 24px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  transition: transform .3s var(--ease), box-shadow .3s, border-color .3s;
}
.project-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), #58c8d2 55%, var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: #c3dce4;
  box-shadow: var(--shadow-md);
}
.project-card:hover::before { transform: scaleX(1); }
.project-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.project-top img { width: 60px; height: 60px; }
.project-no {
  color: #c2d1dd;
  font-family: var(--mono);
  font-size: 12px;
}
.project-overline {
  margin-top: 19px;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .15em;
}
.project-card h3 {
  margin-top: 7px;
  color: var(--navy);
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
}
.project-card > p:not(.project-overline) {
  margin-top: 11px;
  color: var(--muted);
  font-size: 12.8px;
  line-height: 1.85;
}
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 16px;
}
.tag-row span {
  padding: 3px 8px;
  background: #f2f8fa;
  border: 1px solid #e1edf1;
  color: #527185;
  font-size: 10px;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 22px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 600;
}
.card-link span { transition: transform .2s; }
.card-link:hover span { transform: translate(3px, -3px); }

/* ---------- features ---------- */
.features {
  position: relative;
  overflow: hidden;
  background-color: var(--navy);
  background-image:
    linear-gradient(120deg, rgba(7, 29, 51, .97), rgba(7, 40, 58, .9)),
    url("../img/pattern-blueprint.svg");
  background-size: auto, 480px 480px;
}
.features::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -120px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(36, 184, 200, .16), transparent 68%);
  pointer-events: none;
}
.section-head-light h2 { color: var(--white); }
.section-head-light .section-intro { color: #a9c1d2; }
.section-head-light .section-kicker { color: #70d6df; }
.feature-layout {
  position: relative;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  gap: 58px;
}
.feature-item {
  display: flex;
  gap: 22px;
  padding: 23px 0;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.feature-item:first-child { padding-top: 0; }
.feature-item:last-child { border-bottom: 0; padding-bottom: 0; }
.feature-item > span {
  flex: 0 0 auto;
  padding-top: 2px;
  color: var(--gold-soft);
  font-family: var(--mono);
  font-size: 10px;
}
.feature-item h3 {
  color: var(--white);
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
}
.feature-item p {
  margin-top: 7px;
  color: #a9c1d2;
  font-size: 12.8px;
  line-height: 1.9;
}
.topology-figure {
  padding: 22px 22px 18px;
  background: var(--white);
  box-shadow: var(--shadow-lg);
}
.topology-head {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 8px;
}
.topology-head span {
  color: var(--teal);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .16em;
}
.topology-head b {
  color: var(--navy);
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
}
.topology-figure img { width: 100%; height: auto; }
.topology-figure figcaption {
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 10.5px;
  line-height: 1.7;
}

/* ---------- process ---------- */
.timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}
.timeline li {
  position: relative;
  padding: 28px 24px 0 0;
}
.timeline li::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--teal);
}
.timeline li:last-child { padding-right: 0; }
.time-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 18px;
  border: 1px solid #bddce2;
  color: var(--teal);
  font-family: var(--mono);
  font-size: 11px;
  background: #f3fbfc;
}
.time-body p {
  color: var(--gold);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .14em;
}
.time-body h3 {
  margin-top: 5px;
  color: var(--navy);
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
}
.time-body span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 11.8px;
  line-height: 1.8;
}

/* ---------- resources ---------- */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.resource-card {
  display: grid;
  grid-template-columns: 52px 1fr 18px;
  grid-template-rows: auto auto;
  column-gap: 14px;
  row-gap: 4px;
  align-items: center;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  transition: transform .25s var(--ease), box-shadow .25s, border-color .25s;
}
.resource-card:hover {
  transform: translateY(-4px);
  border-color: #bcdce3;
  box-shadow: var(--shadow-sm);
}
.file-type {
  grid-row: 1 / 3;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  color: var(--white);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .04em;
}
.file-type.doc { background: #3c6ca8; }
.file-type.svg { background: #0e8fa3; }
.file-type.png { background: #b67b2e; }
.file-type.zip { background: #6c5bb5; }
.resource-copy { display: flex; flex-direction: column; min-width: 0; }
.resource-copy b { color: var(--navy); font-size: 13.5px; }
.resource-copy em {
  overflow: hidden;
  color: var(--muted);
  font-size: 10.5px;
  font-style: normal;
  line-height: 1.6;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.resource-meta {
  grid-column: 2;
  color: #91a5b6;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: .03em;
}
.download-mark {
  grid-column: 3;
  grid-row: 1 / 3;
  color: var(--teal);
  font-size: 15px;
  opacity: .55;
  transition: opacity .2s, transform .2s;
}
.resource-card:hover .download-mark { opacity: 1; transform: translateY(3px); }
.resource-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line-strong);
}
.resource-footer p {
  max-width: 760px;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.8;
}
.resource-footer b { color: var(--ink-soft); }
.resource-footer code {
  padding: 2px 5px;
  background: #e8f1f5;
  color: #35657b;
  font-family: var(--mono);
  font-size: 10px;
}

/* ---------- notices ---------- */
.notices-grid {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  align-items: start;
  gap: 44px;
}
.notice-list { border-top: 1px solid var(--line-strong); }
.notice-row {
  display: grid;
  grid-template-columns: 86px 1fr 18px;
  align-items: center;
  gap: 18px;
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
  transition: padding .25s var(--ease), background .2s;
}
.notice-row:hover { padding-left: 8px; background: #f8fbfc; }
.notice-row time {
  color: var(--teal);
  font-family: var(--mono);
  font-size: 9.5px;
}
.notice-row span { display: flex; flex-direction: column; gap: 3px; }
.notice-row b { color: var(--navy); font-size: 14px; font-weight: 600; }
.notice-row em {
  color: var(--muted);
  font-size: 11.5px;
  font-style: normal;
  line-height: 1.6;
}
.notice-row i { color: var(--teal); font-style: normal; }
.guide-card {
  padding: 32px 30px 30px;
  background:
    radial-gradient(circle at 100% 0, rgba(36, 184, 200, .18), transparent 45%),
    var(--navy);
  color: var(--white);
}
.guide-kicker {
  color: #71d4de;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .16em;
}
.guide-card h3 {
  margin-top: 8px;
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
}
.guide-card ol { margin-top: 20px; }
.guide-card li {
  display: flex;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid rgba(255, 255, 255, .1);
  color: #b8cdd9;
  font-size: 11.8px;
  line-height: 1.7;
}
.guide-card li span {
  flex: 0 0 auto;
  color: var(--gold-soft);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.9;
}
.guide-card .btn { width: 100%; margin-top: 20px; }

/* ---------- contact ---------- */
.contact {
  position: relative;
  padding: 72px 0;
  overflow: hidden;
  color: var(--white);
  background: linear-gradient(118deg, #071d33 0%, #0a354c 52%, #0b5160 100%);
}
.contact::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -260px;
  width: 620px;
  height: 620px;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 50%;
  box-shadow: 0 0 0 80px rgba(255, 255, 255, .025), 0 0 0 160px rgba(255, 255, 255, .018);
  pointer-events: none;
}
.contact-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  align-items: center;
  gap: 60px;
}
.contact .section-kicker { color: #8ee2e8; }
.contact h2 {
  max-width: 720px;
  margin-top: 12px;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 600;
  line-height: 1.35;
}
.contact-copy > p:not(.section-kicker) {
  margin-top: 17px;
  color: #b9d1dd;
  font-size: 13.5px;
  line-height: 1.9;
}
.contact-actions { display: flex; gap: 12px; margin-top: 28px; }
.contact-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid rgba(255, 255, 255, .18);
  border-left: 1px solid rgba(255, 255, 255, .18);
}
.contact-facts > div {
  min-height: 94px;
  padding: 18px;
  border-right: 1px solid rgba(255, 255, 255, .18);
  border-bottom: 1px solid rgba(255, 255, 255, .18);
}
.contact-facts span {
  display: block;
  color: #7fa4b7;
  font-size: 9.5px;
  letter-spacing: .08em;
}
.contact-facts b {
  display: block;
  margin-top: 7px;
  color: #e9f4f7;
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.6;
}

/* ---------- footer ---------- */
.site-footer {
  padding: 46px 0 20px;
  background: #041421;
  color: #8fa8b8;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr .7fr .7fr;
  gap: 56px;
  padding-bottom: 34px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer-brand { display: flex; gap: 13px; align-items: flex-start; }
.footer-brand img { width: 44px; height: 44px; }
.footer-brand div { display: flex; flex-direction: column; gap: 5px; }
.footer-brand b { color: #dcecf2; font-size: 13.5px; font-weight: 600; }
.footer-brand span { color: #6e8b9d; font-size: 11px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links b {
  margin-bottom: 3px;
  color: #dcecf2;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
}
.footer-links a { color: #7f9aab; font-size: 11px; }
.footer-links a:hover { color: var(--gold-soft); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 17px;
  color: #587183;
  font-size: 9.5px;
}

/* ---------- back top ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, .16);
  background: var(--navy);
  color: var(--white);
  font-size: 16px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  visibility: hidden;
  transition: opacity .25s, transform .25s, background .2s;
}
.back-top.is-visible { opacity: 1; transform: none; visibility: visible; }
.back-top:hover { background: var(--teal); }

/* ---------- reveal ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .nav-link { padding: 0 12px; font-size: 13px; }
  .nav-link::after { right: 12px; left: 12px; }
  .nav-platform { padding: 0 12px; }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .resource-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { gap: 40px; }
  .feature-layout { gap: 36px; }
  .footer-grid { gap: 36px; }
}

@media (max-width: 900px) {
  .container { width: min(var(--container), calc(100% - 36px)); }
  .masthead-note { display: none; }
  .nav-toggle { display: block; flex: 0 0 auto; }
  .brand { flex: 1 1 auto; min-width: 0; }
  .brand-copy { min-width: 0; }
  .brand-copy strong { overflow-wrap: anywhere; }
  .main-nav { position: sticky; }
  .nav-inner {
    display: block;
    min-height: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s var(--ease);
  }
  .main-nav.is-open .nav-inner { max-height: 620px; }
  .nav-link {
    display: flex;
    padding: 12px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, .07);
  }
  .nav-link::after { display: none; }
  .nav-platform {
    display: flex;
    justify-content: center;
    margin: 13px 0 16px;
  }
  .hero { min-height: 620px; }
  .hero-inner { padding: 80px 0 98px; }
  .hero h1 { font-size: clamp(34px, 6.4vw, 48px); }
  .hero-desc { max-width: 660px; }
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
  .quick-card:nth-child(2) { border-right: 0; }
  .quick-card:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .about-grid { grid-template-columns: 1fr; }
  .about-figure { order: -1; }
  .about-figure .figure-frame { max-width: 720px; }
  .data-band { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .data-band > div:nth-child(2) { border-right: 0; }
  .data-band > div:nth-child(3) { padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .12); }
  .data-band > div:nth-child(4) { padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .12); }
  .feature-layout { grid-template-columns: 1fr; }
  .topology-figure { max-width: 760px; }
  .timeline { grid-template-columns: 1fr; border-top: 0; }
  .timeline li {
    display: grid;
    grid-template-columns: 62px 1fr;
    column-gap: 18px;
    padding: 0 0 26px;
    border-left: 1px solid var(--line);
  }
  .timeline li::before {
    top: 18px;
    left: -5px;
  }
  .timeline li:last-child { padding-bottom: 0; }
  .time-no { margin: 0 0 0 -1px; grid-row: 1 / 3; background: var(--white); }
  .time-body { padding-top: 8px; }
  .notices-grid { grid-template-columns: 1fr; }
  .guide-card { max-width: 620px; }
  .contact-grid { grid-template-columns: 1fr; gap: 38px; }
  .contact-facts { max-width: 620px; }
  .footer-grid { grid-template-columns: 1.4fr .8fr .8fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 5px; }
}

@media (max-width: 640px) {
  .container { width: calc(100% - 32px); }
  .utility-inner { min-height: 30px; font-size: 10.5px; }
  .utility-links { display: none; }
  .masthead-inner { min-height: 78px; gap: 12px; }
  .brand-logo { width: 46px; height: 46px; }
  .brand-copy strong { font-size: 15px; line-height: 1.4; }
  .brand-copy em { font-size: 8px; letter-spacing: .14em; }
  .nav-toggle { width: 38px; height: 38px; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 32px; }
  .section-head-row { display: block; }
  .section-head h2 { font-size: 29px; }
  .section-head-compact h2 { font-size: 26px; }
  .section-intro { font-size: 12.5px; }
  .hero { min-height: 690px; }
  .hero-inner { padding: 64px 0 88px; }
  .hero-eyebrow { font-size: 8px; letter-spacing: .12em; }
  .hero-eyebrow span { width: 18px; }
  .hero h1 { margin-top: 17px; font-size: 27px; line-height: 1.45; }
  .hero-lead { margin-top: 15px; font-size: 15px; letter-spacing: .03em; }
  .hero-desc { font-size: 11.5px; line-height: 1.85; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 10px; margin-top: 24px; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { flex-wrap: wrap; margin-top: 30px; }
  .hero-stats > div { width: 50%; min-width: 0; padding: 14px 0 0; border-right: 0; }
  .hero-stats > div:nth-child(odd) { border-right: 1px solid rgba(255, 255, 255, .13); }
  .hero-stats > div:nth-child(n+3) { margin-top: 12px; }
  .hero-stats dt { font-size: 24px; }
  .hero-stats dd { font-size: 9px; }
  .hero-scroll { display: none; }
  .quick-section { margin-top: -34px; }
  .quick-grid { grid-template-columns: 1fr; }
  .quick-card { min-height: 78px; border-right: 0; border-bottom: 1px solid var(--line); }
  .quick-card:nth-child(3) { border-bottom: 1px solid var(--line); }
  .quick-card:last-child { border-bottom: 0; }
  .about-copy .lead { font-size: 17px; }
  .about-copy > p + p { font-size: 12.5px; }
  .data-band { grid-template-columns: 1fr; padding: 24px 0; }
  .data-band > div { padding: 0 24px; border-right: 0; }
  .data-band > div + div { margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .12); }
  .data-band > div:nth-child(3) { padding-top: 18px; }
  .data-band strong { font-size: 26px; }
  .project-grid { grid-template-columns: 1fr; gap: 16px; }
  .project-card { min-height: 0; padding: 24px 22px 22px; }
  .feature-item { gap: 16px; }
  .feature-item h3 { font-size: 17px; }
  .topology-figure { padding: 14px 12px 12px; }
  .resource-grid { grid-template-columns: 1fr; gap: 12px; }
  .resource-card { padding: 15px; }
  .resource-footer { flex-direction: column; align-items: flex-start; }
  .resource-footer .btn { width: 100%; }
  .notice-row { grid-template-columns: 1fr 18px; gap: 10px; }
  .notice-row time { grid-column: 1 / 3; }
  .notice-row b { font-size: 13px; }
  .guide-card { padding: 26px 22px; }
  .contact { padding: 56px 0; }
  .contact h2 { font-size: 29px; }
  .contact-actions { flex-direction: column; align-items: stretch; }
  .contact-actions .btn { width: 100%; }
  .contact-facts { grid-template-columns: 1fr; }
  .contact-facts > div { min-height: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px; }
  .footer-brand { grid-column: 1 / 3; }
  .footer-bottom { font-size: 8.5px; line-height: 1.7; }
  .back-top { right: 16px; bottom: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}