/* ============================================================
   about.css · 桥接 v1 class 到 v2 设计语言
   颜色 token 继承 ../style.css (--blue / --ink / --bg ...)
   ============================================================ */

/* === Layout primitives === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 8px;
  z-index: 200;
  padding: 8px 16px;
  background: var(--ink, #1d1d1f);
  color: white;
  border-radius: 8px;
  font-size: 13px;
  transition: top 0.2s var(--ease, ease);
}
.skip-link:focus { top: 8px; }

/* === Site Header === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.nav-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 4px;
  text-decoration: none;
  color: inherit;
}
.brand__logo {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink, #1d1d1f);
  letter-spacing: 0.01em;
}
.brand__divider {
  color: var(--ink-4, #86868b);
  font-size: 14px;
  margin: 0 2px;
}
.brand__name {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink-2, #424245);
}
.brand__r {
  font-size: 9px;
  color: #c8a85b;
  vertical-align: super;
  margin-left: 1px;
}
.brand__sub {
  font-size: 12px;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0.05em;
}
.primary-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
  list-style: none;
  padding: 0;
}
.primary-nav > ul {
  display: flex;
  gap: 22px;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: nowrap;
}
.primary-nav li {
  list-style: none;
  display: inline-block;
}
.primary-nav a {
  font-size: 13px;
  color: var(--ink-2, #424245);
  letter-spacing: 0.02em;
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
  white-space: nowrap;
  text-decoration: none;
  display: inline-block;
}
.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--ink, #1d1d1f);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
}
.primary-nav a:hover { color: var(--ink, #1d1d1f); }
.primary-nav a:hover::after { transform: scaleX(1); }
.primary-nav a.is-hot { color: var(--blue, #0071e3); }
.primary-nav a.is-hot::after { background: var(--blue, #0071e3); }

.nav-cta {
  font-size: 13px;
  color: var(--blue, #0071e3);
  font-weight: 500;
  padding: 7px 14px;
  border: 1px solid transparent;
  border-radius: 980px;
  transition: all 0.2s ease;
}
.nav-cta:hover {
  background: var(--blue, #0071e3);
  color: white;
}
.nav-toggle {
  display: none;
  width: 32px; height: 32px;
  flex-direction: column; justify-content: center; gap: 4px;
  align-items: center; margin-left: auto;
  background: none; border: 0; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 18px; height: 1.5px;
  background: var(--ink, #1d1d1f);
}
@media (max-width: 720px) {
  .primary-nav, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
}

/* === Archive Hero === */
.archive-hero {
  padding: 100px 24px 60px;
  background: var(--bg, #ffffff);
  position: relative;
  overflow: hidden;
}
.archive-hero__bg {
  position: absolute; inset: 0; pointer-events: none;
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 0%, transparent 80%);
}
.hero__noise {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at top right, rgba(0, 113, 227, 0.07), transparent 60%);
}
.archive-hero__inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  text-align: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--blue, #0071e3);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 20px;
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--blue, #0071e3);
}
.archive-hero__title {
  font-family: var(--serif);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 16px;
  color: var(--ink, #1d1d1f);
}
.archive-hero__sub {
  font-size: 18px;
  color: var(--ink-2, #424245);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.archive-hero__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 0 auto;
  max-width: 880px;
}
.archive-hero__nav a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--ink-2, #424245);
  background: var(--bg-2, #f5f5f7);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 980px;
  transition: all 0.2s ease;
}
.archive-hero__nav a:hover {
  background: var(--ink, #1d1d1f);
  color: white;
  border-color: var(--ink, #1d1d1f);
  transform: translateY(-1px);
}

/* === Section generic === */
.section {
  padding: 100px 24px;
  background: var(--bg, #ffffff);
  position: relative;
}
.section--alt {
  background: var(--bg-2, #f5f5f7);
}
.section-head {
  max-width: 1200px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-head--left { text-align: left; }
.section-head--left .section-sub { margin-left: 0; margin-right: 0; }
.section-sub {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0;
  text-transform: none;
  font-weight: 400;
  max-width: 720px;
  margin: 16px auto 0;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin: 0;
  color: var(--ink, #1d1d1f);
}

/* === Info Grid (basic info cards) === */
.info-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.info-card {
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 16px;
  padding: 20px;
  transition: all 0.25s ease;
}
.info-card:hover {
  border-color: var(--blue, #0071e3);
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -16px rgba(0, 113, 227, 0.12);
}
.info-card__label {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 8px;
}
.info-card__value {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink, #1d1d1f);
  line-height: 1.3;
}
.info-card__hint {
  font-size: 12px;
  color: var(--ink-3, #6e6e73);
  margin: 6px 0 0;
}
@media (max-width: 1024px) { .info-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .info-grid { grid-template-columns: 1fr; } }

/* === Timeline (vertical) === */
.timeline {
  display: block;
  max-width: 880px;
  margin: 0 auto;
  list-style: none;
  padding: 0;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 16px; bottom: 16px;
  left: 100px;
  width: 2px;
  background: linear-gradient(180deg, var(--line, #d2d2d7), var(--line-3, #f0f0f3));
}
.timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 40px;
  padding: 16px 0 16px 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  text-align: left;
}
.timeline__item--now .timeline__year { color: var(--blue, #0071e3); }
.timeline__year {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink, #1d1d1f);
  text-align: right;
  padding-top: 4px;
  position: relative;
  z-index: 1;
}
.timeline__body {
  position: relative;
  padding-left: 32px;
}
.timeline__body::before {
  content: "";
  position: absolute;
  left: -9px; top: 8px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--line, #d2d2d7);
  z-index: 1;
}
.timeline__item--now .timeline__body::before {
  background: var(--blue, #0071e3);
  border-color: var(--blue, #0071e3);
  box-shadow: 0 0 0 6px rgba(0, 113, 227, 0.15);
}
.timeline__body h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--ink, #1d1d1f);
}
.timeline__body p {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-2, #424245);
  margin: 0 0 12px;
}
.timeline__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--blue, #0071e3);
  background: rgba(0, 113, 227, 0.08);
  padding: 3px 10px;
  border-radius: 980px;
  letter-spacing: 0.05em;
  margin-top: 4px;
}
.timeline__tag--now {
  background: var(--blue, #0071e3);
  color: white;
  animation: pulse 2s ease infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 113, 227, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(0, 113, 227, 0); }
}
@media (max-width: 720px) {
  .timeline::before { left: 16px; }
  .timeline__item { grid-template-columns: 1fr; gap: 0; }
  .timeline__year { text-align: left; padding-left: 32px; }
}

/* === Google Block === */
.google-block {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 24px;
  padding: 56px;
  position: relative;
  overflow: hidden;
}
.google-block::before {
  content: "";
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0, 113, 227, 0.06), transparent 70%);
  pointer-events: none;
}
.google-block__sub {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue, #0071e3);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.google-block__copy h3 {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  color: var(--ink, #1d1d1f);
}
.google-block__copy p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2, #424245);
  margin: 0 0 16px;
}
.google-block__list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.google-block__list li {
  padding-left: 24px;
  position: relative;
  font-size: 14.5px;
  color: var(--ink-2, #424245);
}
.google-block__list li::before {
  content: "→";
  position: absolute; left: 0; top: 0;
  color: var(--blue, #0071e3);
  font-weight: 600;
}
.google-block__panel {
  position: relative;
  z-index: 1;
  background: var(--bg-2, #f5f5f7);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 18px;
  padding: 32px;
  text-align: center;
}
.google-block__big {
  font-family: var(--serif);
  font-size: clamp(72px, 8vw, 120px);
  font-weight: 900;
  color: var(--blue, #0071e3);
  line-height: 1;
  letter-spacing: -0.04em;
  margin: 0 0 8px;
  background: linear-gradient(180deg, var(--blue, #0071e3) 0%, #005bb5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.google-block__sub {
  font-size: 14px;
  color: var(--ink-2, #424245);
  margin: 0 0 20px;
  font-weight: 500;
}
.google-block__timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid var(--line-3, #f0f0f3);
  padding-top: 20px;
}
.google-block__timeline li {
  font-size: 13.5px;
  color: var(--ink-2, #424245);
  display: flex;
  justify-content: space-between;
}
.google-block__timeline li b {
  font-family: var(--serif);
  color: var(--ink, #1d1d1f);
  font-weight: 700;
}
@media (max-width: 720px) {
  .google-block { grid-template-columns: 1fr; padding: 32px 24px; gap: 32px; }
}

/* === Founder block === */
.founder {
  max-width: 1200px;
  margin: 0 auto;
}
.founder__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 48px;
  padding: 32px 28px;
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 18px;
}
.founder__stats > div {
  text-align: center;
  border-right: 1px solid var(--line-3, #f0f0f3);
  padding: 0 8px;
}
.founder__stats > div:last-child { border-right: 0; }
.founder__stats b {
  display: block;
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 900;
  color: var(--ink, #1d1d1f);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}
.founder__stats span {
  font-size: 12px;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0.04em;
}
.founder__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 18px;
  padding: 40px;
}
.founder__body h3 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--ink, #1d1d1f);
}
.founder__body p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-2, #424245);
  margin: 0 0 12px;
}
.founder__systems {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.founder__systems li {
  font-size: 13.5px;
  color: var(--ink-2, #424245);
  padding: 6px 0 6px 16px;
  position: relative;
}
.founder__systems li::before {
  content: "→";
  position: absolute; left: 0;
  color: var(--blue, #0071e3);
}
@media (max-width: 1024px) {
  .founder__stats { grid-template-columns: repeat(2, 1fr); }
  .founder__stats > div:nth-child(2n) { border-right: 0; }
  .founder__body { grid-template-columns: 1fr; padding: 32px 24px; }
}
@media (max-width: 480px) {
  .founder__stats { grid-template-columns: 1fr 1fr; padding: 24px 16px; }
  .founder__systems { grid-template-columns: 1fr; }
}

/* === Expertise (3 cards) === */
.grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 24px;
}
.grid--expertise {
  grid-template-columns: repeat(3, 1fr);
}
.exp-card {
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 20px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.exp-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue, #0071e3), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.exp-card:hover { transform: translateY(-4px); border-color: var(--blue, #0071e3); box-shadow: 0 20px 50px -20px rgba(0, 113, 227, 0.15); }
.exp-card:hover::before { transform: scaleX(1); }
.exp-card__icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 113, 227, 0.08);
  color: var(--blue, #0071e3);
  margin-bottom: 20px;
}
.exp-card--geo .exp-card__icon { background: rgba(0, 113, 227, 0.12); color: var(--blue, #0071e3); }
.exp-card--seo .exp-card__icon { background: rgba(52, 199, 89, 0.12); color: #34c759; }
.exp-card--ai  .exp-card__icon { background: rgba(175, 82, 222, 0.12); color: #af52de; }
.exp-card__tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue, #0071e3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 8px;
}
.exp-card h3 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  color: var(--ink, #1d1d1f);
}
.exp-card p {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink-2, #424245);
  margin: 0 0 16px;
}
.exp-card__list {
  list-style: none;
  padding: 16px 0 0;
  margin: auto 0 0;
  border-top: 1px solid var(--line-3, #f0f0f3);
}
.exp-card__list li {
  font-size: 13.5px;
  color: var(--ink-2, #424245);
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.exp-card__list li::before {
  content: "";
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--blue, #0071e3);
  flex-shrink: 0;
}
.exp-card__link {
  display: inline-block;
  margin-top: 16px;
  font-size: 13px;
  color: var(--blue, #0071e3);
  font-weight: 500;
}
.exp-card__link:hover { text-decoration: underline; }
@media (max-width: 1024px) { .grid--expertise { grid-template-columns: 1fr; } }

/* === Honor (certification cards) === */
.honor {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.honor-card {
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 18px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  position: relative;
}
.honor-card:hover {
  transform: translateY(-3px);
  border-color: var(--blue, #0071e3);
  box-shadow: 0 20px 40px -15px rgba(0, 113, 227, 0.12);
}
.honor-card--lead {
  background: linear-gradient(160deg, rgba(212, 168, 87, 0.08), rgba(0, 113, 227, 0.04));
  border-color: rgba(0, 113, 227, 0.25);
}
.honor-card--baike {
  background: linear-gradient(160deg, rgba(46, 95, 230, 0.1), rgba(74, 138, 255, 0.04));
  border-color: rgba(74, 138, 255, 0.3);
}
.honor-card--baike h3 { color: #4a8aff; }
.honor-card__ribbon {
  display: inline-block;
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: white;
  background: linear-gradient(135deg, #c8a85b 0%, #b8932d 100%);
  border-radius: 4px;
  margin-bottom: 12px;
  font-weight: 600;
  align-self: flex-start;
}
.honor-card__ribbon--blue {
  background: linear-gradient(135deg, #2e5fe6 0%, #4a8aff 100%);
}
.honor-card h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--ink, #1d1d1f);
  line-height: 1.3;
}
.honor-card p {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-2, #424245);
  margin: 0 0 12px;
  flex: 1;
}
.honor-card__type {
  display: inline-block;
  font-size: 11px;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.honor-card__id {
  display: inline-block;
  font-family: "SF Mono", Menlo, Monaco, monospace;
  font-size: 12px;
  padding: 1px 6px;
  background: rgba(74, 138, 255, 0.12);
  border: 1px solid rgba(74, 138, 255, 0.3);
  border-radius: 3px;
  color: #4a8aff;
  margin-left: 4px;
}
.honor-card__download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--blue, #0071e3);
  background: rgba(0, 113, 227, 0.06);
  border: 1px solid rgba(0, 113, 227, 0.2);
  border-radius: 980px;
  transition: all 0.2s ease;
  align-self: flex-start;
}
.honor-card__download:hover {
  background: var(--blue, #0071e3);
  color: white;
  border-color: var(--blue, #0071e3);
}
.honor-card__download--blue {
  background: linear-gradient(135deg, #2e5fe6 0%, #4a8aff 100%);
  color: white;
  border-color: transparent;
}
.honor-card__download--blue:hover {
  box-shadow: 0 8px 20px rgba(74, 138, 255, 0.3);
  filter: brightness(1.05);
}
@media (max-width: 1100px) { .honor { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px)  { .honor { grid-template-columns: 1fr; } }

/* === Books (publications) === */
.books {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.book {
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 20px;
  padding: 36px;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  align-items: start;
  transition: all 0.3s ease;
}
.book--feature { border-color: rgba(0, 113, 227, 0.25); }
.book:hover { transform: translateY(-3px); box-shadow: 0 20px 50px -20px rgba(0, 113, 227, 0.15); }
.book__cover {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: 12px;
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: white;
  background: linear-gradient(160deg, #1d1d1f 0%, #424245 100%);
  box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}
.book__cover--geo { background: linear-gradient(160deg, #1d1d1f 0%, #005bb5 100%); }
.book__cover--google { background: linear-gradient(160deg, #1d1d1f 0%, #0a4d8a 100%); }
.book__cover-deco {
  position: absolute;
  top: -10px; right: -10px;
  font-family: var(--serif);
  font-size: 80px;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.06);
  line-height: 1;
  pointer-events: none;
}
.book__cover-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: white;
  background: rgba(255, 255, 255, 0.15);
  padding: 3px 8px;
  border-radius: 3px;
  letter-spacing: 0.15em;
  align-self: flex-start;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.book__cover-sub {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  margin: 12px 0 0;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.book__cover-meta {
  font-size: 10px;
  color: rgba(255, 255, 255, 0.55);
  margin: 12px 0 0;
  letter-spacing: 0.04em;
}
.book__body { display: flex; flex-direction: column; gap: 12px; }
.book__body h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink, #1d1d1f);
  line-height: 1.3;
}
.book__body p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-2, #424245);
  margin: 0;
}
.book__body-list {
  list-style: none;
  padding: 8px 0 0;
  margin: 0;
  border-top: 1px dashed var(--line-3, #f0f0f3);
  columns: 2;
  column-gap: 12px;
}
.book__body-list li {
  font-size: 12.5px;
  color: var(--ink-3, #6e6e73);
  padding: 3px 0 3px 14px;
  line-height: 1.55;
  position: relative;
  break-inside: avoid;
}
.book__body-list li::before {
  content: "·";
  position: absolute; left: 4px; top: 0;
  color: var(--blue, #0071e3);
  font-weight: 700;
}
.book__download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 500;
  color: white;
  background: var(--blue, #0071e3);
  border-radius: 980px;
  transition: all 0.2s ease;
  align-self: flex-start;
  margin-top: 8px;
}
.book__download:hover {
  background: #005bb5;
  transform: translateY(-1px);
  box-shadow: 0 8px 16px -4px rgba(0, 113, 227, 0.3);
}
.books__hint {
  max-width: 1200px;
  margin: 32px auto 0;
  text-align: center;
  font-size: 13px;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0.04em;
}
@media (max-width: 720px) {
  .books { grid-template-columns: 1fr; }
  .book { grid-template-columns: 1fr; padding: 24px; }
  .book__cover { max-width: 200px; }
  .book__body-list { columns: 1; }
}

/* === Media === */
.media {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.media__col {
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 18px;
  padding: 28px;
  transition: all 0.3s ease;
}
.media__col:hover { border-color: var(--blue, #0071e3); transform: translateY(-2px); }
.media__cat {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue, #0071e3);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin: 0 0 8px;
}
.media__col h4 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--ink, #1d1d1f);
}
.media__list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.media__list li {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-2, #424245);
  padding: 8px 0;
  border-top: 1px solid var(--line-3, #f0f0f3);
}
.media__list li:first-child { border-top: 0; }
.media__hint {
  max-width: 1200px;
  margin: 20px auto 0;
  text-align: center;
  font-size: 13px;
  color: var(--ink-3, #6e6e73);
}
@media (max-width: 1024px) { .media { grid-template-columns: 1fr; } }

/* === Contact === */
.contact {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  align-items: start;
}
.contact__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.contact__item {
  background: var(--bg, #ffffff);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 16px;
  padding: 24px;
  transition: all 0.25s ease;
}
.contact__item:hover { border-color: var(--blue, #0071e3); transform: translateY(-2px); }
.contact__label {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink-3, #6e6e73);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 8px;
}
.contact__value {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink, #1d1d1f);
  margin: 0;
  word-break: break-all;
}
.contact__value a { color: inherit; }
.contact__value a:hover { color: var(--blue, #0071e3); }
.contact__hint {
  font-size: 12px;
  color: var(--ink-3, #6e6e73);
  margin: 8px 0 0;
  line-height: 1.5;
}
.contact__qr {
  background: var(--bg-2, #f5f5f7);
  border: 1px solid var(--line-3, #f0f0f3);
  border-radius: 18px;
  padding: 24px;
  text-align: center;
}
.contact__qr img {
  width: 100%;
  max-width: 200px;
  margin: 0 auto 12px;
  border-radius: 8px;
}
.contact__qr p {
  font-size: 12px;
  color: var(--ink-3, #6e6e73);
  margin: 0;
  letter-spacing: 0.05em;
}
@media (max-width: 1024px) {
  .contact { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .contact__cards { grid-template-columns: 1fr; }
}

/* === Site Footer === */
.site-footer {
  background: var(--bg, #ffffff);
  border-top: 1px solid var(--line-3, #f0f0f3);
  padding: 48px 24px 24px;
}
.footer__row {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-3, #f0f0f3);
}
.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer__nav {
  display: flex;
  gap: 20px;
}
.footer__nav a {
  font-size: 13px;
  color: var(--ink-3, #6e6e73);
}
.footer__nav a:hover { color: var(--ink, #1d1d1f); }
.footer__contact {
  font-size: 13px;
  color: var(--ink-2, #424245);
}
.footer__contact a { color: var(--ink-2, #424245); }
.footer__contact a:hover { color: var(--blue, #0071e3); }
.footer__divider {
  color: var(--ink-4, #86868b);
  margin: 0 6px;
}
.footer__legal {
  max-width: 1200px;
  margin: 24px auto 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--ink-3, #6e6e73);
}
.footer__archive-link {
  color: var(--blue, #0071e3);
  font-weight: 500;
}
.footer__archive-link:hover { text-decoration: underline; }
.footer__archive-link::before { content: "← "; }

/* === Float phone === */
.float-phone {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  color: white;
  background: var(--blue, #0071e3);
  border-radius: 980px;
  box-shadow: 0 10px 30px -8px rgba(0, 113, 227, 0.4);
  text-decoration: none;
  transition: all 0.2s ease;
}
.float-phone:hover { background: #005bb5; transform: translateY(-2px); }
@media (max-width: 480px) {
  .float-phone { right: 16px; bottom: 16px; padding: 10px 16px; font-size: 13px; }
}

/* === Misc === */
.dot-sep {
  width: 3px; height: 3px; border-radius: 50%;
  background: var(--ink-3, #6e6e73);
  opacity: 0.5;
  display: inline-block;
  margin: 0 6px;
  vertical-align: middle;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}