/* ============================================================
   金博中心 · Site Kit 共享样式 /assets/site.css
   01 reset  02 tokens  03 基础排版  04 布局工具
   05 头部   06 页脚    07 通用组件  08 响应式  09 动效偏好
   ============================================================ */

/* 01 reset ---------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 32px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--graphite);
  background-color: var(--frost);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { display: block; }

h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, fieldset {
  margin: 0;
}

ul, ol { margin: 0; padding: 0; list-style: none; }

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

::selection { background: var(--amber-200); color: var(--ink-900); }

/* 02 tokens --------------------------------------------------- */
:root {
  --ink-950: #07131F;
  --ink-900: #0B1B2B;
  --ink-700: #14314D;
  --ice-300: #7FB6D9;
  --ice-100: #DCEBF4;
  --amber-500: #D99A2B;
  --amber-200: #F3D9A4;
  --frost: #F6F2E9;
  --graphite: #22272E;
  --steel: #8E9AA6;
  --red: #B94736;

  --line-on-ink: rgba(127, 182, 217, 0.24);
  --line-on-paper: rgba(34, 39, 46, 0.14);
  --line-soft: rgba(142, 154, 166, 0.32);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "Roboto Mono", monospace;

  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 48px;
  --s6: 64px;
  --s7: 96px;
  --s8: 144px;

  --shell: 1240px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* 03 基础排版 -------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
  border-radius: 1px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 400;
  display: inline-block;
  padding: 12px 20px;
  background: var(--amber-500);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: top 0.22s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* 04 布局工具 -------------------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--ink { background: var(--ink-900); color: var(--ice-100); }
.section--paper { background: var(--frost); color: var(--graphite); }
.section--cool { background: var(--ice-100); color: var(--ink-900); }

.grid {
  display: grid;
  gap: clamp(16px, 2.5vw, 32px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--split-rev { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

/* 05 头部 ----------------------------------------------------- */
.site-header {
  position: relative;
  z-index: 120;
  background: var(--ink-900);
  color: var(--frost);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line-on-ink);
}

.site-header__top {
  position: relative;
  background: linear-gradient(180deg, #0E2135 0%, var(--ink-900) 100%);
}

.site-header__top::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--amber-500) 0 22px,
    transparent 22px 44px
  );
  opacity: 0.55;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  min-height: 88px;
  padding-block: 14px;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
  min-width: 0;
}

.brand-mark {
  position: relative;
  display: block;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border: 1.5px solid var(--ice-300);
  border-radius: 1px;
}

.brand-mark::before {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
  background: var(--amber-500);
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: rgba(127, 182, 217, 0.55);
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.12;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--frost);
  white-space: nowrap;
}

.brand-line {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.26em;
  color: var(--ice-300);
  text-transform: uppercase;
  white-space: nowrap;
}

.site-nav { margin-left: auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.9vw, 10px);
}

.site-nav__item { display: block; }

.site-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 10px;
  color: rgba(220, 235, 244, 0.72);
  transition: color 0.25s var(--ease);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--ice-300);
  opacity: 0.7;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

.site-nav__label {
  font-size: 13.5px;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  background: var(--amber-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s var(--ease);
}

.site-nav__link:hover { color: var(--frost); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--frost);
  font-weight: 700;
}

.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--amber-500);
  opacity: 1;
}

.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.site-header__aside {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  margin-left: clamp(8px, 2vw, 24px);
}

.site-utility {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid rgba(217, 154, 43, 0.7);
  border-radius: 2px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--amber-200);
  white-space: nowrap;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease),
    border-color 0.25s var(--ease);
}

.site-utility::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 6px;
  background: var(--amber-500);
  transform: rotate(45deg);
  transition: background-color 0.25s var(--ease);
}

.site-utility:hover {
  background: var(--amber-500);
  border-color: var(--amber-500);
  color: var(--ink-900);
}

.site-utility:hover::before { background: var(--ink-900); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--line-on-ink);
  border-radius: 2px;
  color: var(--ice-100);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
}

.nav-toggle:hover { border-color: var(--ice-300); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
  flex: 0 0 18px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.25s var(--ease), top 0.25s var(--ease),
    bottom 0.25s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  bottom: 5px;
  transform: rotate(-45deg);
}

.service-bar {
  background: var(--ink-700);
  border-top: 1px solid rgba(127, 182, 217, 0.16);
}

.service-bar__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px clamp(12px, 2vw, 24px);
  min-height: 50px;
  padding-block: 9px;
}

.service-bar__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ice-300);
  white-space: nowrap;
}

.service-bar__label::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--amber-500);
}

.service-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.service-switch__btn {
  padding: 6px 14px;
  border: 1px solid rgba(127, 182, 217, 0.32);
  border-radius: 2px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(220, 235, 244, 0.8);
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
    border-color 0.22s var(--ease);
}

.service-switch__btn:hover {
  border-color: var(--amber-500);
  color: var(--amber-200);
}

.service-switch__btn[aria-pressed="true"] {
  background: var(--amber-500);
  border-color: var(--amber-500);
  color: var(--ink-900);
  font-weight: 700;
}

.service-bar__toggle {
  margin-left: auto;
  padding: 4px 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--steel);
  border-bottom: 1px dotted currentColor;
  transition: color 0.22s var(--ease);
}

.service-bar__toggle:hover { color: var(--frost); }

.service-bar[data-collapsed] .service-switch { display: none; }

.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 300;
  pointer-events: none;
  background: transparent;
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--amber-500);
  box-shadow: 0 0 10px rgba(217, 154, 43, 0.6);
  transition: width 0.1s linear;
}

/* 06 页脚 ----------------------------------------------------- */
.site-footer {
  position: relative;
  background: var(--ink-950);
  color: var(--ice-100);
  padding-top: var(--s6);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    rgba(217, 154, 43, 0.75) 0 18px,
    transparent 18px 40px
  );
}

.site-footer__inner { padding-bottom: var(--s4); }

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 0.85fr 0.85fr 1.35fr;
  gap: clamp(24px, 4vw, 56px);
  padding-top: var(--s3);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--frost);
}

.footer-brand__rule {
  display: block;
  width: 44px;
  height: 2px;
  margin: 14px 0 10px;
  background: var(--amber-500);
}

.footer-brand__line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ice-300);
}

.footer-note {
  margin-top: 18px;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(220, 235, 244, 0.62);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-col__title::before {
  content: "";
  width: 12px;
  height: 2px;
  background: var(--amber-500);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-col__link {
  display: inline-block;
  padding: 7px 0;
  font-size: 14px;
  color: rgba(220, 235, 244, 0.78);
  transition: color 0.22s var(--ease), transform 0.22s var(--ease);
}

.footer-col__link:hover {
  color: var(--amber-200);
  transform: translateX(4px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-contact__value {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ice-100);
  word-break: break-word;
}

.footer-contact__value--mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--amber-200);
}

.footer-record {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: var(--s5);
  padding: 12px 16px;
  border: 1px dashed rgba(142, 154, 166, 0.45);
  border-radius: 2px;
  background: rgba(20, 49, 77, 0.55);
}

.footer-record__label {
  padding: 3px 8px;
  border-radius: 1px;
  background: var(--amber-200);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.footer-record__text {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--amber-200);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  margin-top: var(--s4);
  padding-top: var(--s3);
  border-top: 1px solid rgba(142, 154, 166, 0.24);
  font-size: 12.5px;
  color: var(--steel);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-left: auto;
}

.footer-legal__link {
  padding-bottom: 1px;
  color: rgba(220, 235, 244, 0.72);
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.footer-legal__link:hover {
  color: var(--frost);
  border-bottom-color: var(--amber-500);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* 07 通用组件 -------------------------------------------------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: clamp(16px, 3vw, 40px);
  padding-bottom: var(--s3);
  margin-bottom: var(--s5);
  border-bottom: 1px solid var(--line-on-paper);
}

.section--ink .section-head,
.section--ink .section-head { border-bottom-color: var(--line-on-ink); }

.section-num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--amber-500);
}

.section-titles {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--steel);
}

.section--ink .section-kicker { color: var(--ice-300); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.display {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(44px, 8vw, 120px);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 38em;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.75;
}

.prose {
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.78;
}

.prose p { margin-bottom: 1.15em; }
.prose p:last-child { margin-bottom: 0; }

.prose h3 {
  margin: 1.6em 0 0.6em;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

.prose ul { margin-bottom: 1.15em; padding-left: 1.3em; list-style: disc; }
.prose ol { margin-bottom: 1.15em; padding-left: 1.3em; list-style: decimal; }
.prose li { margin-bottom: 0.45em; }

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--amber-500);
}

.prose strong { font-weight: 700; }

.panel {
  position: relative;
  padding: clamp(20px, 3vw, 40px);
  border: 1px solid var(--line-on-paper);
  border-radius: 2px;
  background: var(--frost);
  color: var(--graphite);
}

.panel--ink {
  background: var(--ink-700);
  color: var(--ice-100);
  border-color: var(--line-on-ink);
}

.panel--deep {
  background: var(--ink-900);
  color: var(--ice-100);
  border-color: var(--line-on-ink);
}

.panel--cool {
  background: var(--ice-100);
  color: var(--ink-900);
  border-color: rgba(20, 49, 77, 0.18);
}

.panel--gold {
  background: var(--amber-200);
  color: var(--ink-900);
  border-color: rgba(217, 154, 43, 0.55);
}

.paper-stack {
  position: relative;
  isolation: isolate;
}

.paper-stack::before,
.paper-stack::after {
  content: "";
  position: absolute;
  z-index: -1;
  border-radius: 2px;
}

.paper-stack::before {
  inset: 10px -10px -10px 10px;
  background: rgba(20, 49, 77, 0.16);
}

.paper-stack::after {
  inset: 5px -5px -5px 5px;
  background: var(--ice-100);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.04em;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
    border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--amber-500);
  color: var(--ink-900);
}

.btn--primary:hover { background: var(--amber-200); }

.btn--ghost {
  border-color: currentColor;
  color: inherit;
  background: transparent;
}

.btn--ghost:hover { background: rgba(127, 182, 217, 0.14); }

.btn--cool {
  background: var(--ice-300);
  color: var(--ink-900);
}

.btn--cool:hover { background: var(--ice-100); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.tag--amber { color: var(--amber-500); }
.tag--cool { color: var(--ice-300); }
.tag--alert { color: var(--red); }

.tag--solid {
  background: var(--amber-500);
  border-color: var(--amber-500);
  color: var(--ink-900);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.breadcrumb__link {
  color: inherit;
  transition: color 0.2s var(--ease);
}

.breadcrumb__link:hover { color: var(--amber-500); }

.breadcrumb__sep { opacity: 0.6; }

.breadcrumb__current { color: var(--graphite); }

.breadcrumb--ink { color: var(--ice-300); }
.breadcrumb--ink .breadcrumb__current { color: var(--frost); }

.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(127, 182, 217, 0.22);
  border-radius: 2px;
  background: var(--ink-700);
}

.figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.figure--wide .figure__img { aspect-ratio: 21 / 9; }
.figure--tall .figure__img { aspect-ratio: 4 / 5; }
.figure--square .figure__img { aspect-ratio: 1 / 1; }

.figure__ph {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background-image: repeating-linear-gradient(
      135deg,
      rgba(127, 182, 217, 0.14) 0 12px,
      transparent 12px 24px
    ),
    linear-gradient(160deg, var(--ink-700), var(--ink-950));
}

.figure__tag {
  position: absolute;
  left: 12px;
  top: 12px;
  padding: 4px 8px;
  background: var(--amber-500);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.price {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.price__value {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.4vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber-500);
}

.price__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  opacity: 0.7;
}

.price__note {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

.panel--ink .price__note,
.panel--deep .price__note { color: rgba(220, 235, 244, 0.62); }

.index-rail {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.index-rail__link {
  display: flex;
  gap: 10px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  color: var(--steel);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.index-rail__link:hover {
  color: var(--graphite);
  border-left-color: var(--ice-300);
}

.index-rail__link[aria-current="true"] {
  color: var(--ink-900);
  border-left-color: var(--amber-500);
  background: rgba(217, 154, 43, 0.12);
  font-weight: 700;
}

.reveal-init {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.reveal-init.is-visible {
  opacity: 1;
  transform: none;
}

/* 08 响应式 --------------------------------------------------- */
@media (max-width: 1180px) {
  .site-nav__index { display: none; }
  .brand-line { letter-spacing: 0.18em; }
}

@media (max-width: 1023px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-note { max-width: none; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 959px) {
  .site-header__inner {
    min-height: 70px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 130;
    max-height: min(70vh, 520px);
    overflow-y: auto;
    padding: 8px clamp(20px, 4vw, 48px) 18px;
    background: var(--ink-700);
    border-top: 1px solid var(--line-on-ink);
    border-bottom: 1px solid var(--line-on-ink);
    box-shadow: 0 24px 40px -20px rgba(0, 0, 0, 0.7);
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item { border-bottom: 1px solid rgba(127, 182, 217, 0.14); }
  .site-nav__item:last-child { border-bottom: 0; }

  .site-nav__link {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 14px 4px;
  }

  .site-nav__index { display: inline; opacity: 0.8; }

  .site-nav__link::after {
    left: 0;
    right: auto;
    bottom: 0;
    width: 0;
    transform: none;
    transition: width 0.3s var(--ease);
  }

  .site-nav__link:hover::after,
  .site-nav__link[aria-current="page"]::after { width: 100%; }

  .nav-toggle { display: inline-flex; }

  .site-header__aside { margin-left: auto; }

  .grid--2,
  .grid--3,
  .grid--split,
  .grid--split-rev { grid-template-columns: minmax(0, 1fr); }

  .index-rail { position: static; }
}

@media (max-width: 720px) {
  .brand-name { font-size: 17px; letter-spacing: 0.1em; }
  .brand-line { font-size: 9.5px; letter-spacing: 0.16em; }
  .brand-mark { width: 28px; height: 28px; flex: 0 0 28px; }
  .site-utility { padding: 8px 11px; font-size: 11.5px; gap: 6px; }
  .site-utility::before { width: 5px; height: 5px; flex: 0 0 5px; }
  .nav-toggle { padding: 8px 10px; gap: 7px; }
  .nav-toggle__text { display: none; }

  .service-bar__label { letter-spacing: 0.16em; }
  .service-switch__btn { padding: 5px 11px; font-size: 12px; }

  .footer-bottom { gap: 8px 16px; }
  .footer-legal { margin-left: 0; }
  .footer-copy { margin-left: auto; }
}

@media (max-width: 640px) {
  .site-footer { padding-top: var(--s5); }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); gap: var(--s4); }
  .section-head { align-items: flex-start; }
  .footer-record { padding: 12px 14px; }
}

@media (max-width: 460px) {
  .brand-line { display: none; }
  .site-header__inner { min-height: 64px; }
  .service-bar__toggle { margin-left: 0; }
}

/* 09 动效偏好 -------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .progress__bar { transition: none; }

  .reveal-init,
  .reveal-init.is-visible {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .footer-col__link:hover { transform: none; }
}