:root {
  --ink: #143247;
  --muted: #7b92a3;
  --blue: #0a5cf5;
  --blue-deep: #02163f;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--blue-deep);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: #fff;
  background: #02163f;
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

button,
a {
  touch-action: manipulation;
}

.content-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 12% 12%, rgba(35, 176, 255, 0.16), transparent 40%),
    radial-gradient(ellipse at 90% 45%, rgba(35, 226, 255, 0.09), transparent 36%),
    url("/assets/hero-latest-blur.webp") center bottom / cover no-repeat,
    linear-gradient(180deg, #02173f 0%, #052b70 50%, #031b4d 100%);
  opacity: 0.28;
  filter: blur(16px);
  transform: scale(1.06);
}

.content-nav {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  padding: calc(12px + env(safe-area-inset-top)) 18px 12px;
}

.nav-back {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 50%;
  background: rgba(2, 24, 77, 0.2);
  color: #fff;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.nav-back svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-title {
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 0.12em;
  text-shadow: 0 2px 12px rgba(0, 15, 60, 0.35);
}

.nav-spacer {
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
}

.nav-invite {
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 16px;
  color: rgba(238, 252, 255, 0.82);
  font-size: 9px;
  letter-spacing: 0.06em;
  background: rgba(2, 24, 77, 0.16);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.content-shell {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  padding: 0 18px;
}

.content-hero {
  position: relative;
  height: clamp(215px, 40vw, 330px);
  overflow: hidden;
  border-radius: 0 0 24px 24px;
  background: #0637a8;
  isolation: isolate;
}

.content-hero picture,
.content-hero img {
  display: block;
  width: 100%;
  height: 100%;
}

.content-hero img {
  object-fit: cover;
  object-position: center 42%;
  transform: scale(1.015);
  animation: contentHeroIn 1.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.content-hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 13, 55, 0.32) 0%, transparent 32%, rgba(2, 22, 63, 0.78) 100%),
    linear-gradient(90deg, rgba(0, 15, 60, 0.16), transparent 28%, transparent 72%, rgba(0, 15, 60, 0.16));
}

.content-hero-copy {
  position: absolute;
  right: 20px;
  bottom: 43px;
  left: 20px;
  z-index: 2;
  text-align: center;
}

.content-hero-copy p {
  margin: 0 0 5px;
  color: rgba(219, 248, 255, 0.64);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 8.5px;
  letter-spacing: 0.24em;
}

.content-hero-copy h1 {
  margin: 0;
  color: #fff;
  font-family: var(--serif);
  font-size: clamp(27px, 7.5vw, 36px);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-indent: 0.14em;
  text-shadow: 0 3px 18px rgba(0, 18, 75, 0.45);
}

.content-hero-copy span {
  display: block;
  margin-top: 6px;
  color: rgba(227, 249, 255, 0.54);
  font-size: 9px;
  letter-spacing: 0.16em;
}

.paper {
  position: relative;
  z-index: 3;
  margin: -27px auto 0;
  padding: 25px 22px 23px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 17px;
  background: rgba(252, 254, 255, 0.98);
  color: var(--ink);
  box-shadow: 0 25px 60px rgba(0, 12, 52, 0.32);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.paper-head {
  margin-bottom: 15px;
}

.paper-eyebrow {
  display: block;
  margin-bottom: 5px;
  color: #7e9bad;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 8px;
  letter-spacing: 0.26em;
}

.paper-head h2 {
  margin: 0;
  color: #0d304d;
  font-family: var(--serif);
  font-size: clamp(21px, 5.4vw, 26px);
  letter-spacing: 0.09em;
}

.about-lead {
  margin: 0 0 18px;
  color: #4d687a;
  font-family: var(--serif);
  font-size: clamp(13px, 3.5vw, 15px);
  line-height: 1.95;
  text-align: justify;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-bottom: 19px;
}

.fact {
  padding: 11px 12px;
  border: 1px solid rgba(17, 101, 190, 0.08);
  border-radius: 9px;
  background: #f4faff;
}

.fact span {
  display: block;
  margin-bottom: 4px;
  color: #8ba1b0;
  font-size: 8.5px;
  letter-spacing: 0.06em;
}

.fact strong {
  display: block;
  color: #1a4059;
  font-family: var(--serif);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.45;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 11px;
  color: #1b4f80;
  font-family: var(--serif);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.section-label::before,
.section-label::after {
  content: "";
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, transparent, rgba(19, 98, 177, 0.23));
}

.section-label::after {
  background: linear-gradient(90deg, rgba(19, 98, 177, 0.23), transparent);
}

.section-label span {
  flex: 0 0 auto;
  padding: 4px 10px;
  border-radius: 3px;
  background: linear-gradient(100deg, #0b4ec8, #0d6de2);
  color: #fff;
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.org-list {
  margin: 0;
  padding: 0;
}

.org-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(23, 74, 130, 0.12);
}

.org-row:last-child {
  border-bottom: 0;
}

.org-row dt {
  align-self: start;
  margin-top: 1px;
  padding: 3px 5px;
  border-radius: 2px;
  background: #edf6ff;
  color: #24669e;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: center;
}

.org-row dd {
  margin: 0;
  color: #36566b;
  font-size: 11px;
  line-height: 1.7;
}

.paper-note {
  margin: 16px 0 0;
  padding-top: 13px;
  border-top: 1px dashed rgba(23, 74, 130, 0.12);
  color: #8da1ae;
  font-size: 9px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  text-align: center;
}

.paper-actions {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 16px;
}

.paper-actions--single .ghost-action {
  flex: 1;
}

.primary-action,
.ghost-action {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  border-radius: 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.primary-action {
  flex: 1.35;
  gap: 5px;
  background: linear-gradient(100deg, #0840c6, #0d6eee 55%, #18b4f1);
  color: #fff;
  box-shadow: 0 8px 18px rgba(8, 72, 210, 0.19);
}

.primary-action span {
  font-size: 14px;
  line-height: 1;
}

.ghost-action {
  flex: 1;
  border: 1px solid rgba(18, 97, 255, 0.15);
  background: #fff;
  color: #5b788c;
}

.content-footer {
  position: relative;
  z-index: 1;
  margin-top: 26px;
  padding: 0 18px calc(24px + env(safe-area-inset-bottom));
  color: rgba(193, 235, 255, 0.32);
  font-size: 8.5px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  text-align: center;
}

.content-footer p {
  margin: 0;
}

.content-footer span {
  display: block;
  color: rgba(193, 235, 255, 0.22);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 7.5px;
  letter-spacing: 0.18em;
}

/* 议程 */
.date-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 16px;
  padding: 13px 16px;
  overflow: hidden;
  border-radius: 10px;
  background:
    radial-gradient(ellipse at 90% 10%, rgba(84, 224, 255, 0.26), transparent 42%),
    linear-gradient(105deg, #073bb2, #0b5adc 58%, #0b9be0);
  color: #fff;
}

.date-banner > div {
  display: flex;
  align-items: baseline;
  gap: 11px;
}

.date-banner span {
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 0.08em;
}

.date-banner strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.date-banner p {
  margin: 0;
  color: rgba(224, 250, 255, 0.62);
  font-size: 8.5px;
  letter-spacing: 0.12em;
}

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

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 75px minmax(0, 1fr);
  gap: 11px;
  padding: 10px 0 10px 17px;
  border-left: 1px solid rgba(24, 98, 166, 0.14);
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 17px;
  left: -3.5px;
  width: 7px;
  height: 7px;
  border: 1.5px solid #2a86d8;
  border-radius: 50%;
  background: #fbfdff;
}

.timeline-item time {
  padding-top: 1px;
  color: #3d7da9;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 10px;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.timeline-item h3 {
  margin: 0;
  color: #26485d;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.65;
}

.item-tag {
  display: inline-block;
  margin-bottom: 3px;
  padding: 2px 5px;
  border-radius: 2px;
  background: #edf6ff;
  color: #2b77ad;
  font-size: 8px;
  letter-spacing: 0.04em;
}

.timeline-item.is-key {
  margin: 4px 0;
  padding: 13px 0 13px 17px;
  border-left-color: rgba(20, 116, 208, 0.3);
  background: linear-gradient(90deg, rgba(236, 247, 255, 0.85), rgba(247, 252, 255, 0.2));
}

.timeline-item.is-key::before {
  top: 20px;
  border-color: #0b6bdc;
  background: #0b6bdc;
  box-shadow: 0 0 0 3px rgba(11, 107, 220, 0.1);
}

.timeline-item.is-key h3 {
  color: #14537e;
  font-weight: 600;
}

/* 动画 */
.reveal {
  opacity: 0;
  transform: translate3d(0, 16px, 0);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--d, 0s);
}

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

html:not(.js) .reveal {
  opacity: 1;
  transform: none;
}

@keyframes contentHeroIn {
  from {
    opacity: 0;
    transform: scale(1.07);
  }
  to {
    opacity: 1;
    transform: scale(1.015);
  }
}

@media (min-width: 641px) {
  .content-shell {
    padding: 0 26px;
  }

  .content-hero {
    border-radius: 0 0 28px 28px;
  }

  .paper {
    padding: 30px 30px 27px;
  }

  .org-row {
    grid-template-columns: 82px minmax(0, 1fr);
  }

  .org-row dd,
  .timeline-item h3 {
    font-size: 12.5px;
  }

  .timeline-item {
    grid-template-columns: 84px minmax(0, 1fr);
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .timeline-item time {
    font-size: 10.5px;
  }
}

@media (max-width: 360px) {
  .content-shell {
    padding: 0 12px;
  }

  .paper {
    padding: 21px 16px 19px;
  }

  .fact-grid {
    grid-template-columns: 1fr;
  }

  .org-row {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .timeline-item {
    grid-template-columns: 67px minmax(0, 1fr);
    gap: 8px;
    padding-left: 14px;
  }

  .timeline-item time {
    font-size: 9.5px;
  }

  .timeline-item h3 {
    font-size: 11.5px;
  }

  .paper-actions {
    flex-direction: column;
  }

  .primary-action,
  .ghost-action {
    width: 100%;
    flex: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}