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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul {
  margin: 0;
}

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

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

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

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

:root {
  --orange: #FF7A1A;
  --teal: #2BB3A3;
  --sand: #F5C24B;
  --ink: #10233F;
  --deep-teal: #0B4A46;
  --wine: #7A1F3D;
  --indigo: #4B3A8F;
  --cream: #FFF7EC;
  --paper: #F4E8D8;
  --mist: #DDF4EF;
  --slate: #5C6573;
  --white: #FFFFFF;

  --ink-06: rgba(16, 35, 63, 0.06);
  --ink-10: rgba(16, 35, 63, 0.1);
  --ink-16: rgba(16, 35, 63, 0.16);
  --cream-55: rgba(255, 247, 236, 0.55);
  --cream-70: rgba(255, 247, 236, 0.72);
  --cream-85: rgba(255, 247, 236, 0.86);
  --cream-16: rgba(255, 247, 236, 0.16);

  --font-display: "HarmonyOS Sans SC", "Alibaba PuHuiTi 3", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "HarmonyOS Sans SC", "Alibaba PuHuiTi 3", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 30px;
  --wrap: 1200px;
  --progress: 0;
}

body {
  background-color: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 17px);
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.015em;
}

strong,
b {
  font-weight: 800;
}

:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
  border-radius: 6px;
}

#main-content {
  scroll-margin-top: 140px;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 200;
  padding: 0.7rem 1.3rem;
  border-radius: 0 0 16px 16px;
  background-color: var(--orange);
  color: var(--ink);
  font-weight: 800;
  font-size: 14px;
  transform: translate(-50%, -130%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

/* ---------- 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

.section {
  padding-block: clamp(42px, 7vw, 100px);
}

.section--tight {
  padding-block: clamp(24px, 4vw, 52px);
}

.section--paper { background-color: var(--paper); }
.section--mist { background-color: var(--mist); color: var(--deep-teal); }
.section--ink { background-color: var(--ink); color: var(--cream); }
.section--deep-teal { background-color: var(--deep-teal); color: var(--cream); }
.section--wine { background-color: var(--wine); color: var(--cream); }
.section--indigo { background-color: var(--indigo); color: var(--cream); }

.section--ink .lede,
.section--deep-teal .lede,
.section--wine .lede,
.section--indigo .lede {
  color: var(--cream-70);
}

.section--ink .kicker,
.section--deep-teal .kicker,
.section--wine .kicker,
.section--indigo .kicker {
  color: rgba(245, 194, 75, 0.92);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

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

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

.grid--mosaic {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--mosaic > * {
  grid-column: span 12;
  min-width: 0;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--gap, 1rem);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--gap, 0.6rem);
}

/* ---------- 字体组件 ---------- */
.display {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 128px);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.035em;
}

.display--slant {
  transform: rotate(-2deg);
  transform-origin: left bottom;
}

.section-title {
  font-size: clamp(28px, 4vw, 56px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.lede {
  max-width: 56ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.78;
  color: var(--slate);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
}

.kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--orange);
}

.vnote {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--slate);
}

.rot-tag {
  display: inline-block;
  transform: rotate(-3deg);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.prose {
  max-width: 62ch;
}

.prose p {
  margin-bottom: 1.1em;
}

.prose h2,
.prose h3 {
  margin-top: 1.7em;
  margin-bottom: 0.6em;
}

.prose ul,
.prose ol {
  margin-bottom: 1.1em;
  padding-left: 1.4em;
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-block: 0.35em;
}

.prose a {
  color: var(--deep-teal);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.prose a:hover {
  color: var(--orange);
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: var(--orange);
  --btn-fg: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.2rem;
  border: 2px solid transparent;
  border-radius: 999px;
  background-color: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 0 -6px rgba(16, 35, 63, 0.35);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  --btn-bg: var(--orange);
  --btn-fg: var(--ink);
}

.btn--teal {
  --btn-bg: var(--teal);
  --btn-fg: var(--ink);
}

.btn--ink {
  --btn-bg: var(--ink);
  --btn-fg: var(--cream);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--cream);
  border-color: rgba(255, 247, 236, 0.34);
}

.btn--ghost:hover {
  --btn-bg: var(--sand);
  --btn-fg: var(--ink);
  border-color: transparent;
}

.btn--sm {
  padding: 0.5rem 0.95rem;
  font-size: 13px;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.26rem 0.72rem;
  border: 1px solid var(--ink-10);
  border-radius: 999px;
  background-color: var(--paper);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.tag--version {
  background-color: var(--sand);
  border-color: transparent;
  color: var(--ink);
}

.tag--orange {
  background-color: var(--orange);
  border-color: transparent;
  color: var(--ink);
}

.tag--teal {
  background-color: var(--mist);
  border-color: rgba(11, 74, 70, 0.18);
  color: var(--deep-teal);
}

.tag--wine {
  background-color: var(--wine);
  border-color: transparent;
  color: var(--white);
}

.tag--indigo {
  background-color: var(--indigo);
  border-color: transparent;
  color: var(--white);
}

.tag--outline {
  background-color: transparent;
  border-color: var(--ink-16);
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  border: 1px solid var(--ink-06);
  border-radius: var(--radius);
  background-color: var(--white);
  box-shadow: 0 20px 44px -38px rgba(16, 35, 63, 0.6);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.card--paper { background-color: var(--paper); }
.card--mist { background-color: var(--mist); border-color: rgba(11, 74, 70, 0.14); }
.card--ink { background-color: var(--ink); color: var(--cream); border-color: transparent; }
.card--wine { background-color: var(--wine); color: var(--white); border-color: transparent; }
.card--indigo { background-color: var(--indigo); color: var(--white); border-color: transparent; }
.card--orange { background-color: var(--orange); color: var(--ink); border-color: transparent; }
.card--sand { background-color: var(--sand); color: var(--ink); border-color: transparent; }
.card--teal { background-color: var(--teal); color: var(--ink); border-color: transparent; }

.card--lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 54px -34px rgba(16, 35, 63, 0.65);
}

.card__eyebrow {
  display: block;
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.card__title {
  margin-bottom: 0.5rem;
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 900;
  line-height: 1.26;
}

.card__text {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--slate);
}

.card__meta {
  display: block;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.card--ink .card__text,
.card--wine .card__text,
.card--indigo .card__text {
  color: var(--cream-70);
}

.card--ink .card__eyebrow,
.card--wine .card__eyebrow,
.card--indigo .card__eyebrow,
.card--ink .card__meta,
.card--wine .card__meta,
.card--indigo .card__meta {
  color: rgba(245, 194, 75, 0.85);
}

/* ---------- 数据 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.stat__num {
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 64px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.035em;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.section--ink .stat__label,
.section--deep-teal .stat__label,
.section--wine .stat__label,
.section--indigo .stat__label {
  color: var(--cream-55);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  color: var(--slate);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb a {
  color: var(--slate);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(92, 101, 115, 0.4);
}

.breadcrumb a:hover {
  color: var(--ink);
  text-decoration-color: currentColor;
}

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

.breadcrumb__sep {
  color: rgba(16, 35, 63, 0.26);
}

/* ---------- 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border-radius: 18px;
  background-image: linear-gradient(135deg, var(--paper) 0%, var(--mist) 55%, #F7E7CE 100%);
  background-color: var(--paper);
}

.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--1x1 { aspect-ratio: 1 / 1; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media--9x16 { aspect-ratio: 9 / 16; }

.media--round { border-radius: 50%; }
.media--soft { border-radius: var(--radius-lg); }

.media__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
}

.media__caption {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--cream);
  border-bottom: 1px solid var(--ink-06);
}

.site-header::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  pointer-events: none;
  background-image: linear-gradient(90deg, var(--orange) 0%, var(--sand) 46%, var(--teal) 100%);
  transform: scaleX(var(--progress));
  transform-origin: 0 50%;
  transition: transform 0.12s linear;
}

.header-top {
  background-color: var(--ink);
  color: var(--cream);
}

.header-top__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 24px);
  padding-block: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.72rem;
  padding-block: 2px;
}

.brand__mark {
  display: grid;
  flex: none;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 15px 15px 15px 5px;
  background-color: var(--orange);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
  transform: rotate(-4deg);
  box-shadow: 0 7px 0 -3px rgba(255, 122, 26, 0.4);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-display);
  font-size: clamp(16px, 1.5vw, 21px);
  font-weight: 900;
  letter-spacing: 0.02em;
}

.brand__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sand);
}

.header-top__meta {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.header-link {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cream-85);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
  text-decoration-color: rgba(255, 247, 236, 0.32);
  transition: color 0.16s ease, text-decoration-color 0.16s ease;
}

.header-link:hover {
  color: var(--sand);
  text-decoration-color: currentColor;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.52rem 0.9rem;
  border: 1px solid rgba(255, 247, 236, 0.3);
  border-radius: 999px;
  background-color: rgba(255, 247, 236, 0.1);
  color: var(--cream);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.nav-toggle:hover {
  background-color: rgba(255, 247, 236, 0.2);
  border-color: rgba(245, 194, 75, 0.7);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
}

.nav-bar {
  background-color: var(--cream);
  border-top: 1px solid var(--ink-06);
}

.nav-bar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: 0.5rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
  padding-block: 0.15rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.nav-list li {
  flex: none;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.nav-list a:hover {
  background-color: var(--paper);
}

.nav-list a[aria-current="page"] {
  background-color: var(--orange);
  color: var(--ink);
  box-shadow: 0 5px 0 -2px rgba(255, 122, 26, 0.38);
  transform: translateY(-1px);
}

.nav-bar__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--slate);
  white-space: nowrap;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(42px, 6vw, 84px);
  padding-block: clamp(38px, 5vw, 66px) 0;
  overflow: hidden;
  background-color: var(--ink);
  color: var(--cream);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -150px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  pointer-events: none;
  background-image: radial-gradient(circle at 42% 42%, rgba(43, 179, 163, 0.34), rgba(43, 179, 163, 0) 68%);
}

.site-footer::after {
  content: "";
  position: absolute;
  bottom: -120px;
  left: -110px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  pointer-events: none;
  background-image: radial-gradient(circle at 50% 50%, rgba(245, 194, 75, 0.2), rgba(245, 194, 75, 0) 70%);
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.15fr;
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand .brand__name {
  color: var(--cream);
}

.footer-brand__text {
  max-width: 34ch;
  margin-top: 1rem;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--cream-70);
}

.footer-brand__meta {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cream-55);
}

.footer-heading {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--sand);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem 1.2rem;
}

.footer-links a {
  font-size: 14.5px;
  color: var(--cream-85);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
  text-decoration-color: transparent;
  transition: color 0.16s ease, text-decoration-color 0.16s ease;
}

.footer-links a:hover {
  color: var(--sand);
  text-decoration-color: currentColor;
}

.contact-list {
  display: grid;
  gap: 0.75rem;
}

.contact-list li {
  display: grid;
  gap: 0.15rem;
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--cream-55);
}

.contact-list__value {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--cream-85);
  overflow-wrap: anywhere;
}

.footer-hint {
  margin-top: 0.95rem;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--cream-55);
}

.manual {
  position: relative;
  z-index: 1;
  margin-top: clamp(28px, 4vw, 48px);
  overflow: hidden;
  border: 1px solid var(--cream-16);
  border-radius: 18px;
  background-color: rgba(255, 247, 236, 0.05);
}

.manual__summary {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 26px);
  list-style: none;
  font-weight: 800;
  cursor: pointer;
  transition: background-color 0.18s ease;
}

.manual__summary::-webkit-details-marker {
  display: none;
}

.manual__summary:hover {
  background-color: rgba(255, 247, 236, 0.07);
}

.manual__index {
  flex: none;
  padding: 0.18rem 0.55rem;
  border: 1px solid rgba(245, 194, 75, 0.45);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--sand);
}

.manual__title {
  font-size: 14.5px;
  letter-spacing: 0.02em;
}

.manual__chev {
  flex: none;
  width: 10px;
  height: 10px;
  margin-left: auto;
  border-right: 2px solid var(--sand);
  border-bottom: 2px solid var(--sand);
  transform: rotate(45deg);
  transition: transform 0.22s ease;
}

.manual[open] .manual__chev {
  transform: rotate(-135deg);
}

.manual__body {
  padding: 0 clamp(16px, 2.4vw, 26px) clamp(16px, 2.4vw, 24px);
  font-size: 14px;
  line-height: 1.8;
  color: var(--cream-70);
}

.manual__list {
  margin-top: 0.6rem;
  padding-left: 1.1rem;
  list-style: disc;
}

.manual__list li {
  margin-block: 0.35rem;
}

.footer-bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-top: clamp(26px, 4vw, 44px);
  padding-block: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--cream-16);
  font-size: 12.5px;
  color: var(--cream-55);
}

.footer-bottom__copy,
.footer-bottom__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
}

.footer-legal a {
  color: var(--cream-70);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: rgba(255, 247, 236, 0.28);
  transition: color 0.16s ease;
}

.footer-legal a:hover {
  color: var(--sand);
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(12px, 2vw, 28px);
  bottom: clamp(12px, 2vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1rem;
  border: 1px solid rgba(255, 247, 236, 0.22);
  border-radius: 999px;
  background-color: var(--ink);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease, background-color 0.2s ease, visibility 0.2s;
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  background-color: var(--deep-teal);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .grid--mosaic > .span-4 { grid-column: span 4; }
  .grid--mosaic > .span-5 { grid-column: span 5; }
  .grid--mosaic > .span-6 { grid-column: span 6; }
  .grid--mosaic > .span-7 { grid-column: span 7; }
  .grid--mosaic > .span-8 { grid-column: span 8; }
}

@media (max-width: 1100px) {
  .nav-bar__meta {
    display: none;
  }
}

@media (max-width: 980px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .header-link,
  .tag--version {
    display: none;
  }

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

  .nav-bar {
    display: none;
    border-top: 1px solid var(--ink-10);
  }

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

  .nav-bar__inner {
    padding-block: 0.6rem;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    max-height: 60vh;
    overflow-x: hidden;
    overflow-y: auto;
  }

  .nav-list a {
    justify-content: flex-start;
    padding: 0.72rem 1rem;
    border-radius: 14px;
  }

  .nav-list a[aria-current="page"] {
    transform: none;
    box-shadow: none;
  }

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

@media (max-width: 720px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }

  .display {
    font-size: clamp(40px, 12vw, 72px);
  }

  .vnote {
    writing-mode: horizontal-tb;
    letter-spacing: 0.16em;
  }
}

@media (max-width: 620px) {
  .header-top__meta {
    display: none;
  }

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

  .brand__mark {
    width: 38px;
    height: 38px;
    font-size: 19px;
    border-radius: 13px 13px 13px 5px;
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-links {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .to-top {
    padding: 0.55rem 0.85rem;
  }
}

@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;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .card--lift:hover,
  .nav-list a[aria-current="page"],
  .to-top[data-visible] {
    transform: none;
  }
}