:root {
  --ink: #001e3c;
  --ink-2: #002a4f;
  --mint: #99ffcc;
  --volt: #00ff41;
  --line: rgba(153, 255, 204, 0.24);
  --line-soft: rgba(153, 255, 204, 0.12);
  --text: #e4f7ef;
  --text-dim: rgba(228, 247, 239, 0.74);
  --serif: 'Cormorant Garamond', 'Libre Baskerville', 'Songti SC', 'Noto Serif SC', Georgia, serif;
  --body-serif: 'Libre Baskerville', Georgia, 'Songti SC', 'Noto Serif SC', serif;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--body-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
  background-color: var(--ink);
  background-image:
    radial-gradient(58vw 46vw at 88% -8%, rgba(0, 255, 65, 0.16), transparent 68%),
    radial-gradient(46vw 42vw at 4% 42%, rgba(153, 255, 204, 0.1), transparent 66%),
    radial-gradient(40vw 40vw at 70% 96%, rgba(0, 255, 65, 0.08), transparent 70%);
  background-attachment: fixed;
}

a {
  color: var(--mint);
  text-decoration: none;
}

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

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: 0.01em;
}

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

/* ---------- 顶栏 ---------- */
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px clamp(16px, 4vw, 52px);
}

.sigil {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 62% 38% 55% 45% / 45% 55% 45% 55%;
  color: var(--mint);
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1;
  overflow: hidden;
  animation: morph 14s ease-in-out infinite alternate;
}

.sigil-mark {
  display: block;
  padding-top: 1px;
}

.sigil-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sigil:hover {
  border-color: var(--volt);
  color: var(--volt);
}

.seek {
  display: flex;
  border: 1px solid var(--line);
  background: rgba(0, 30, 60, 0.5);
}

.seek input {
  width: 152px;
  min-height: 42px;
  padding: 0 12px;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 16px;
}

.seek input::placeholder {
  color: rgba(205, 238, 224, 0.55);
}

.seek input:focus {
  outline: 1px solid var(--volt);
  outline-offset: -1px;
}

/* ---------- 锚点条 ---------- */
.jumpbar {
  position: sticky;
  top: 0;
  z-index: 30;
  overflow-x: auto;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line);
  background: rgba(0, 24, 48, 0.93);
  backdrop-filter: blur(9px);
  -webkit-backdrop-filter: blur(9px);
}

.jumpbar ul {
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0 clamp(8px, 3vw, 44px);
  list-style: none;
}

.jumpbar a {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding: 0 13px;
  color: var(--text-dim);
  font-size: 16px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.jumpbar a:hover,
.jumpbar a:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.jumpbar a[hidden] {
  display: none;
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: 64vh;
  padding: 7vh clamp(16px, 4vw, 56px) 13vh;
  overflow: hidden;
  border-bottom-left-radius: 52% 9vw;
  border-bottom-right-radius: 52% 9vw;
  isolation: isolate;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.44;
  filter: saturate(0.75) contrast(1.06);
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(102deg, rgba(0, 30, 60, 0.94) 18%, rgba(0, 30, 60, 0.4) 72%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  margin-left: auto;
  max-width: 640px;
  text-align: right;
}

.hero h1 {
  margin: 0;
  font-size: clamp(32px, 6vw, 62px);
  line-height: 1.12;
  color: #f4fff9;
  text-shadow: 0 2px 30px rgba(0, 30, 60, 0.7);
}

.lead {
  margin: 14px 0 0 auto;
  max-width: 32em;
  color: var(--text-dim);
  font-size: 17px;
}

/* ---------- 主体 ---------- */
.core {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 296px;
  gap: clamp(24px, 4vw, 64px);
  max-width: 1220px;
  margin: 0 auto;
  padding: 8vh clamp(16px, 4vw, 56px);
}

.prose {
  padding-left: 18px;
  min-width: 0;
}

.prose div {
  position: relative;
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: clamp(30px, 4vw, 52px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 128px;
}

.prose div:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.prose h2 {
  position: relative;
  margin: 0.2em 0 0.7em;
  font-size: clamp(24px, 3.4vw, 35px);
  line-height: 1.28;
  color: #f6fffb;
}

.prose h2::before {
  content: '';
  position: absolute;
  left: -18px;
  top: 0.5em;
  width: 10px;
  height: 10px;
  background: var(--volt);
  clip-path: polygon(50% 0, 100% 36%, 82% 100%, 18% 100%, 0 36%);
  animation: pulse 6s ease-in-out infinite alternate;
}

.prose h2 + p {
  margin-top: 0;
}

.prose p {
  margin: 0 0 1.05em;
  color: var(--text);
}

.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.25em;
}

.prose li {
  margin-bottom: 0.5em;
}

.prose img {
  display: block;
  margin: 1.4em 0;
  border: 1px solid var(--line);
}

.prose strong {
  color: var(--mint);
  font-weight: 700;
}

.prose blockquote {
  margin: 1.4em 0;
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--mint);
  color: var(--text-dim);
  font-style: italic;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
}

.prose th,
.prose td {
  border: 1px solid var(--line);
  padding: 9px 12px;
  text-align: left;
}

.prose a {
  border-bottom: 1px solid rgba(153, 255, 204, 0.5);
}

/* ---------- 侧栏 ---------- */
.rail {
  position: sticky;
  top: 132px;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 0;
  background: rgba(0, 24, 48, 0.55);
  padding: 20px 18px 22px;
}

.rail small {
  display: block;
  margin-bottom: 2px;
  color: var(--mint);
  font-family: var(--body-serif);
  font-size: 16px;
  letter-spacing: 0.24em;
}

.rail h2 {
  margin: 0 0 10px;
  font-size: 25px;
  line-height: 1.2;
  color: #f4fff9;
}

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

.rail-list li {
  animation: rise 0.55s ease both;
  animation-delay: calc(var(--i, 0) * 55ms);
}

.rail-list a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 4px 0;
  color: #c3e8d8;
  font-size: 16px;
  border-bottom: 1px dotted var(--line-soft);
  transition: padding-left 0.22s ease, color 0.22s ease;
}

.rail-list a:hover {
  padding-left: 7px;
  color: var(--volt);
}

/* ---------- 页脚 ---------- */
.floor {
  margin-top: 9vh;
  padding: 6vh clamp(16px, 4vw, 56px) 4vh;
  border-top: 1px solid var(--line);
  background: rgba(0, 16, 32, 0.62);
}

.floor-top,
.floor-mid,
.floor-bottom {
  max-width: 1220px;
  margin-left: auto;
  margin-right: auto;
}

.floor-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.who {
  display: flex;
  align-items: center;
  gap: 14px;
}

.who-brand {
  margin: 0;
  font-family: var(--serif);
  font-size: 24px;
  color: #f4fff9;
}

.signup {
  display: grid;
  gap: 8px;
}

.signup label {
  color: var(--mint);
  font-size: 16px;
  letter-spacing: 0.22em;
}

.signup-row {
  display: flex;
  gap: 8px;
  border: 1px solid var(--line);
  padding: 6px;
}

.signup input {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 42px;
  padding: 0 10px;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 16px;
}

.signup input::placeholder {
  color: rgba(205, 238, 224, 0.55);
}

.signup button {
  min-height: 42px;
  padding: 0 20px;
  border: 1px solid var(--mint);
  background: var(--mint);
  color: var(--ink);
  font: inherit;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.signup button:hover {
  background: var(--volt);
  border-color: var(--volt);
}

.floor-mid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.floor-mid dl {
  margin: 0;
}

.floor-mid dt {
  color: var(--mint);
  font-size: 16px;
  letter-spacing: 0.22em;
}

.floor-mid dd {
  margin: 4px 0 0;
}

.floor-mid dd a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 2px 0;
  color: var(--text-dim);
  font-size: 16px;
}

.floor-mid dd a:hover {
  color: var(--volt);
}

.floor-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 16px;
}

.floor-bottom p {
  margin: 0;
  color: var(--text-dim);
}

.floor-bottom .tail a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 4px;
}

/* ---------- 动效 ---------- */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes pulse {
  from {
    transform: scale(1);
    opacity: 0.75;
  }
  to {
    transform: scale(1.35);
    opacity: 1;
  }
}

@keyframes morph {
  0% {
    border-radius: 62% 38% 55% 45% / 45% 55% 45% 55%;
  }
  100% {
    border-radius: 42% 58% 38% 62% / 58% 42% 58% 42%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .sigil,
  .prose h2::before,
  .rail-list li {
    animation: none;
  }
  .rail-list a,
  .jumpbar a,
  .signup button {
    transition: none;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 900px) {
  .core {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
    padding-top: 6vh;
  }
  .rail {
    position: static;
    order: 2;
  }
  .floor-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 17px;
  }
  .hero {
    min-height: 52vh;
    padding: 5vh 18px 9vh;
    border-bottom-left-radius: 46% 7vw;
    border-bottom-right-radius: 46% 7vw;
  }
  .hero h1 {
    font-size: clamp(30px, 9vw, 42px);
  }
  .prose {
    padding-left: 15px;
  }
  .prose h2::before {
    left: -15px;
    width: 9px;
    height: 9px;
  }
  .floor-mid {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }
  .floor-bottom {
    flex-wrap: wrap;
  }
  .seek input {
    width: 128px;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}