:root {
  --brand: #e11d48;
  --brand-dark: #be123c;
  --brand-soft: #fff1f2;
  --ink: #1c1917;
  --ink-soft: #44403c;
  --muted: #78716c;
  --line: #e7e5e4;
  --paper: #fafaf9;
  --surface: #ffffff;
  --accent: #f43f5e;
  --max: 1120px;
  --radius: 4px;
  --shadow: 0 12px 40px rgba(28, 25, 23, 0.08);
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Serif SC", "Songti SC", serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(244, 63, 94, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(225, 29, 72, 0.08), transparent 50%),
    linear-gradient(180deg, #fff7f8 0%, var(--paper) 28%, #f5f5f4 100%);
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--brand-dark);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--brand);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.04em;
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.logo span {
  color: var(--brand);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  align-items: center;
}

.nav a {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  color: var(--brand);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  border-radius: var(--radius);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  flex-shrink: 0;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  min-height: clamp(420px, 72vh, 640px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    180deg,
    rgba(28, 25, 23, 0.15) 0%,
    rgba(28, 25, 23, 0.35) 40%,
    rgba(28, 25, 23, 0.82) 100%
  );
}

.hero-content {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: 3.5rem 0 3rem;
  color: #fff;
  animation: rise 0.9s ease both;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  letter-spacing: 0.06em;
  margin: 0 0 0.6rem;
  line-height: 1.15;
}

.hero-brand em {
  font-style: normal;
  color: #fda4af;
}

.hero-lead {
  max-width: 36em;
  margin: 0 0 1.5rem;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.9);
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-dark);
  color: #fff;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

/* Sections */
.section {
  padding: 3.5rem 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.55);
  border-block: 1px solid var(--line);
}

.section-head {
  margin-bottom: 1.75rem;
  max-width: 42rem;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin: 0 0 0.55rem;
  letter-spacing: 0.03em;
  line-height: 1.3;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: start;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.media-frame {
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: var(--surface);
  animation: fadein 0.8s ease both;
}

.media-frame img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.45s ease;
}

.media-frame:hover img {
  transform: scale(1.03);
}

.media-frame.wide img {
  aspect-ratio: 16 / 10;
}

.media-caption {
  padding: 0.75rem 0.9rem 0.95rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
}

.feature-list li {
  position: relative;
  padding: 0.55rem 0 0.55rem 1.35rem;
  border-bottom: 1px dashed var(--line);
  color: var(--ink-soft);
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--accent);
  border-radius: 1px;
}

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  letter-spacing: 0.02em;
  line-height: 1.35;
  margin: 2rem 0 0.85rem;
}

.prose h2 {
  font-size: 1.55rem;
  color: var(--ink);
}

.prose h3 {
  font-size: 1.25rem;
  color: var(--ink-soft);
}

.prose p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
}

.prose ul {
  margin: 0 0 1.2rem;
  padding-left: 1.25rem;
  color: var(--ink-soft);
}

.prose li {
  margin-bottom: 0.4rem;
}

.toc {
  background: var(--brand-soft);
  border: 1px solid #fecdd3;
  padding: 1.1rem 1.25rem;
  margin: 0 0 2rem;
  border-radius: var(--radius);
}

.toc strong {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
}

.toc a {
  display: inline-block;
  margin: 0.2rem 0.75rem 0.2rem 0;
  font-size: 0.95rem;
}

.crumb {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 1.25rem 0 0;
}

.page-hero {
  padding: 2.25rem 0 0.5rem;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0.4rem 0 0.6rem;
  letter-spacing: 0.03em;
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

.legal-box {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.75rem 1.5rem 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 5rem);
  margin: 0;
  color: var(--brand);
  letter-spacing: 0.08em;
}

.error-page p {
  color: var(--muted);
  max-width: 28rem;
  margin: 0.75rem auto 1.5rem;
}

/* Footer */
.site-footer {
  margin-top: 2rem;
  background: #1c1917;
  color: #d6d3d1;
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.site-footer h3 {
  font-family: var(--font-display);
  color: #fff;
  margin: 0 0 0.85rem;
  font-size: 1.1rem;
}

.site-footer p,
.site-footer a {
  color: #a8a29e;
  font-size: 0.92rem;
}

.site-footer a:hover {
  color: #fda4af;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.45rem;
}

.footer-bottom {
  border-top: 1px solid #292524;
  padding-top: 1rem;
  font-size: 0.85rem;
  color: #78716c;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  justify-content: space-between;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadein {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.reveal {
  animation: rise 0.7s ease both;
}

.reveal-delay-1 { animation-delay: 0.12s; }
.reveal-delay-2 { animation-delay: 0.24s; }
.reveal-delay-3 { animation-delay: 0.36s; }

.about-intro {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: start;
  margin-bottom: 1.5rem;
}

.subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
}

.subnav a {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  border-radius: 999px;
  font-size: 0.88rem;
  line-height: 1.2;
}

.subnav a:hover,
.subnav a.active {
  border-color: #fecdd3;
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.page-main {
  padding-bottom: 2rem;
}

.btn-outline {
  background: #fff;
  color: var(--brand);
  border-color: var(--brand);
}

.btn-outline:hover {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.error-actions {
  justify-content: center;
}

.page-links {
  margin-top: 1.5rem;
}

/* Mobile */
@media (max-width: 900px) {
  .grid-2,
  .grid-3,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .nav {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1rem 1rem;
    gap: 0.15rem;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    z-index: 120;
  }

  .nav a {
    padding: 0.65rem 0.35rem;
    border-bottom: 1px dashed var(--line);
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .nav.open {
    display: flex;
    position: absolute;
  }

  .header-inner {
    flex-wrap: nowrap;
  }

  .hero {
    min-height: 520px;
  }

  .media-frame img {
    aspect-ratio: 3 / 4;
  }

  /* 非首页内页移动端重排 */
  .page-inner {
    font-size: 16px;
    line-height: 1.75;
  }

  .page-inner .page-main {
    padding: 0 0 2.5rem;
  }

  .page-inner .page-main > .container {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0;
  }

  .page-inner .crumb {
    margin: 0;
    padding: 0.85rem 1rem 0;
    font-size: 0.82rem;
  }

  .page-inner .page-hero {
    padding: 0.65rem 1rem 1rem;
    background: linear-gradient(180deg, rgba(255, 241, 242, 0.95), rgba(255, 255, 255, 0));
    border-bottom: 1px solid var(--line);
  }

  .page-inner .page-hero h1 {
    font-size: 1.55rem;
    margin: 0.15rem 0 0.45rem;
    line-height: 1.25;
  }

  .page-inner .page-hero p {
    font-size: 0.92rem;
    line-height: 1.65;
    max-width: none;
  }

  .page-inner .subnav {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 0.45rem;
    margin: 0;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.88);
    scrollbar-width: none;
  }

  .page-inner .subnav::-webkit-scrollbar {
    display: none;
  }

  .page-inner .subnav a {
    flex: 0 0 auto;
    padding: 0.5rem 0.9rem;
    font-size: 0.84rem;
  }

  .page-inner .legal-box {
    margin: 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 1.15rem 1rem 2rem;
    background: transparent;
  }

  .page-inner .legal-box.section {
    padding-top: 1.15rem;
    padding-bottom: 2rem;
  }

  .page-inner .prose h2 {
    font-size: 1.2rem;
    margin: 1.45rem 0 0.55rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid #fecdd3;
  }

  .page-inner .prose h2:first-child {
    margin-top: 0.25rem;
  }

  .page-inner .prose h3 {
    font-size: 1.05rem;
    margin: 1.1rem 0 0.4rem;
  }

  .page-inner .prose p,
  .page-inner .prose li {
    font-size: 0.95rem;
    line-height: 1.8;
  }

  .page-inner .prose ul {
    margin: 0 0 1rem;
    padding-left: 1.1rem;
  }

  .page-inner .about-intro {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 0 0 0.5rem;
  }

  .page-inner .about-intro .media-frame {
    order: -1;
    max-width: 220px;
    margin: 0 auto;
    box-shadow: var(--shadow);
  }

  .page-inner .about-intro .media-frame img {
    aspect-ratio: 3 / 4;
  }

  .page-inner .about-intro .media-caption {
    text-align: center;
    font-size: 0.82rem;
    padding: 0.55rem 0.65rem 0.7rem;
  }

  .page-inner .page-links {
    display: grid;
    gap: 0.55rem;
    margin-top: 1.35rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--line);
  }

  .page-inner .page-links a {
    display: block;
    padding: 0.75rem 0.9rem;
    background: var(--brand-soft);
    border: 1px solid #fecdd3;
    border-radius: var(--radius);
    color: var(--brand-dark);
    font-size: 0.92rem;
  }

  .page-inner .site-footer {
    margin-top: 0;
    padding: 1.5rem 0 1.25rem;
  }

  .page-inner .footer-grid {
    gap: 1.15rem;
    margin-bottom: 1.15rem;
  }

  .page-inner .footer-grid > div:first-child p {
    font-size: 0.88rem;
    line-height: 1.6;
  }

  .page-inner .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    font-size: 0.8rem;
  }

  .page-inner .error-page {
    min-height: calc(100vh - 220px);
    padding: 2.5rem 1.15rem 3rem;
    align-content: center;
  }

  .page-inner .error-page h1 {
    font-size: 4rem;
    line-height: 1;
  }

  .page-inner .error-page p {
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 0.85rem auto 1.35rem;
  }

  .page-inner .error-actions {
    width: min(100%, 320px);
    margin-inline: auto;
    flex-direction: column;
  }

  .page-inner .error-actions .btn {
    width: 100%;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .grid-4 {
    grid-template-columns: 1fr 1fr;
    gap: 0.65rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .cta-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .page-inner .logo {
    font-size: 1.25rem;
  }

  .page-inner .logo img {
    width: 34px;
    height: 34px;
  }

  .page-inner .page-hero h1 {
    font-size: 1.4rem;
  }
}