:root {
  --ink: #1a2430;
  --ink-soft: #3a4654;
  --paper: #f3efe6;
  --mist: #d7e2ea;
  --sea: #2f6f7e;
  --sea-deep: #1f4f5a;
  --line: rgba(26, 36, 48, 0.12);
  /* 本机字体：macOS / Windows / Linux 常见中文字体，不依赖外网 */
  --font-display: "Songti SC", "STSong", "SimSun", "Noto Serif CJK SC", serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei",
    "Noto Sans CJK SC", sans-serif;
}

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

/*
  Chromium 121+：只要 scrollbar-width/color 不是 auto，就会忽略 ::-webkit-scrollbar。
  scrollbar-color 还会继承，必须显式设回 auto，再用 webkit 伪元素定宽度。
*/
* {
  scrollbar-width: auto;
  scrollbar-color: auto;
}

::-webkit-scrollbar {
  width: 2px;
  height: 2px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(26, 36, 48, 0.35);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(26, 36, 48, 0.55);
}

::-webkit-scrollbar-corner {
  background: transparent;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 12% -10%, #e8f1f4 0%, transparent 55%),
    radial-gradient(900px 500px at 90% 10%, #efe6d8 0%, transparent 50%),
    linear-gradient(165deg, #eef3f6 0%, var(--paper) 48%, #e7ecef 100%);
}

.page {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 1.25rem clamp(1.25rem, 4vw, 3.5rem) 1.5rem;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.brand-mark > span {
  /* 宋体字形视觉重心偏上，略下移与图标光学对齐 */
  transform: translateY(0.05em);
}

.brand-icon {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 0.28rem;
  display: block;
  flex-shrink: 0;
}

.top-nav {
  display: flex;
  gap: 1.25rem;
}

.top-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
}

.top-nav a:hover {
  color: var(--sea-deep);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  padding: clamp(1.5rem, 5vh, 4rem) 0;
}

.brand-line {
  margin: 0 0 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sea-deep);
}

.brand-line .brand-icon {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 0.32rem;
}

.hero h1 {
  margin: 0;
  max-width: 12em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4.2vw, 3.15rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.lede {
  margin: 1.15rem 0 0;
  max-width: 28em;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.cta-row {
  margin-top: 1.75rem;
}

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

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.35rem;
  border-radius: 0.55rem;
  background: var(--sea);
  color: #f7fbfc;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 10px 24px rgba(31, 79, 90, 0.22);
  transition: background 160ms ease, transform 160ms ease, box-shadow 160ms ease,
    border-color 160ms ease, color 160ms ease;
}

.cta:hover {
  background: var(--sea-deep);
  color: #f7fbfc;
  transform: translateY(-1px);
  box-shadow: 0 14px 28px rgba(31, 79, 90, 0.28);
}

.cta:active {
  transform: translateY(0);
  box-shadow: 0 6px 16px rgba(31, 79, 90, 0.2);
}

.cta-secondary {
  background: transparent;
  color: var(--sea-deep);
  border: 1.5px solid rgba(31, 79, 90, 0.35);
  box-shadow: none;
}

.cta-secondary:hover {
  background: rgba(47, 111, 126, 0.08);
  color: var(--sea-deep);
  border-color: var(--sea-deep);
  box-shadow: none;
}

.cta-secondary:active {
  box-shadow: none;
}

.cta-note {
  margin: 0.7rem 0 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

@media (prefers-reduced-motion: reduce) {
  .desk-glow,
  .manuscript,
  .side-card {
    animation: none;
  }
}

.hero-visual {
  min-height: 280px;
}

.desk {
  position: relative;
  height: min(52vh, 420px);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.55), rgba(243, 239, 230, 0.35)),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 14px,
      rgba(47, 111, 126, 0.03) 14px,
      rgba(47, 111, 126, 0.03) 15px
    );
  overflow: hidden;
}

.desk-glow {
  position: absolute;
  inset: auto -10% -30% 20%;
  height: 70%;
  background: radial-gradient(circle at center, rgba(47, 111, 126, 0.18), transparent 68%);
  pointer-events: none;
  animation: drift 10s ease-in-out infinite alternate;
}

.manuscript {
  position: absolute;
  left: 8%;
  top: 12%;
  width: min(68%, 280px);
  padding: 1.1rem 1.15rem 1.25rem;
  background: #fffaf2;
  border: 1px solid rgba(26, 36, 48, 0.1);
  box-shadow: 0 18px 40px rgba(26, 36, 48, 0.08);
  transform: rotate(-1.5deg);
  animation: settle 900ms ease both;
}

.ms-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--sea);
  margin-bottom: 0.35rem;
}

.ms-title {
  display: block;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.7rem;
}

.ms-body {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.side-card {
  position: absolute;
  right: 8%;
  top: 22%;
  display: grid;
  gap: 0.2rem;
  min-width: 7.5rem;
  padding: 0.75rem 0.9rem;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  font-size: 0.82rem;
  animation: rise 1100ms 120ms ease both;
}

.side-card span:first-child {
  font-weight: 600;
  color: var(--ink);
}

.side-card span:last-child {
  color: var(--ink-soft);
}

.side-card--late {
  top: auto;
  bottom: 16%;
  right: 14%;
  animation-delay: 220ms;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.85rem;
}

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

.foot a:hover {
  color: var(--sea-deep);
}

/* Secondary pages */
.simple {
  max-width: 42rem;
  margin: 0 auto;
  padding: clamp(2rem, 6vh, 4rem) 0;
}

.simple h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

.simple h2 {
  margin: 1.75rem 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
}

.simple-lead {
  margin: 0 0 0.25rem;
  font-size: 1.02rem;
  color: var(--ink) !important;
}

.simple p,
.simple li {
  line-height: 1.75;
  color: var(--ink-soft);
}

.simple-hint {
  margin: 0;
  font-size: 0.9rem;
}

.simple-meta {
  margin-top: 2rem;
  font-size: 0.85rem;
}

.simple a {
  color: var(--sea-deep);
  text-decoration: none;
}

.simple a[data-ext="feedback"]:not([hidden]) {
  display: inline;
  margin-left: 0.25rem;
}

.simple a[data-ext="feedback"]:not([hidden])::before {
  content: "也可发邮件至 ";
  color: var(--ink-soft);
}

/* .simple a 会盖过 .cta 的浅色字，必须单独抬回主按钮对比度 */
.simple a.cta,
.simple .cta {
  color: #f7fbfc;
}

.simple a.cta:hover,
.simple .cta:hover {
  color: #f7fbfc;
}

.simple a.cta-secondary,
.simple .cta-secondary {
  color: var(--sea-deep);
}

.simple a.cta-secondary:hover,
.simple .cta-secondary:hover {
  color: var(--sea-deep);
}

.simple-status {
  margin: 0 0 1.35rem;
  font-size: 1rem;
  color: var(--ink-soft);
}

.simple-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 1.75rem;
}

.cta.is-disabled,
.cta[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
  box-shadow: none;
}

@keyframes settle {
  from {
    opacity: 0;
    transform: translateY(12px) rotate(-1.5deg);
  }
  to {
    opacity: 1;
    transform: translateY(0) rotate(-1.5deg);
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-4%);
  }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

  .desk {
    height: 280px;
  }
}