:root {
  --green: #69ff69;
  --cyan: #00ffff;
  --pink: #ff5fd2;
  --ink: #172617;
  --deep: #0b140d;
  --edge: rgba(105, 255, 105, 0.34);
  --line: rgba(0, 255, 255, 0.24);
  --chrome: linear-gradient(135deg, #f6fff8 0%, #a8c8b2 36%, #ffffff 50%, #8db99b 64%, #e8fff1 100%);
  --font: "Space Grotesk", ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: #e6ffe6;
  background:
    radial-gradient(900px 620px at 92% -12%, rgba(0, 255, 255, 0.18), transparent 62%),
    radial-gradient(760px 520px at 6% 108%, rgba(255, 95, 210, 0.16), transparent 62%),
    var(--ink);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
  background:
    radial-gradient(circle at 18% 22%, #fff 0 1.5px, transparent 2px),
    radial-gradient(circle at 74% 14%, var(--cyan) 0 2px, transparent 2.6px),
    radial-gradient(circle at 88% 68%, #fff 0 1.5px, transparent 2px),
    radial-gradient(circle at 34% 82%, var(--pink) 0 2px, transparent 2.6px),
    radial-gradient(circle at 58% 46%, var(--green) 0 1.5px, transparent 2px);
}

img { max-width: 100%; height: auto; }
p { margin: 0 0 14px; }
a { color: var(--cyan); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ 左侧固定导航 ============ */
.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: 248px;
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 26px 20px 22px;
  background: linear-gradient(180deg, #0a120c 0%, #172617 46%, #0a120c 100%);
  border-right: 2px solid var(--green);
  box-shadow: 8px 0 34px -18px rgba(105, 255, 105, 0.7);
}

.brand {
  display: inline-flex;
  width: 56px;
  height: 56px;
  flex: none;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 26%, #ffffff, #cddcd2 34%, #6d8a78 62%, #ecfff5 100%);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 3px var(--deep), 0 0 20px rgba(0, 255, 255, 0.55);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  top: 20px;
  width: 8px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
}
.brand-mark::before { left: 14px; }
.brand-mark::after { right: 14px; }
.brand:hover .brand-mark,
.brand:focus-visible .brand-mark { filter: drop-shadow(0 0 10px var(--green)); }

.rail-nav { flex: 1 1 auto; min-height: 0; overflow-y: auto; }
.rail-nav p {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  counter-reset: railn;
}

.rail-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 10px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: #d7ffd9;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 14px;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.rail-nav a::before {
  counter-increment: railn;
  content: counter(railn, decimal-leading-zero);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  opacity: 0.85;
}

.rail-nav a:hover,
.rail-nav a:focus-visible {
  color: #fff;
  background: rgba(105, 255, 105, 0.12);
  border-color: var(--green);
}

.rail-search { display: flex; gap: 6px; flex: none; }
.rail-search input { flex: 1 1 auto; }

input[type="search"],
input[type="email"] {
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 16px;
  color: #eaffea;
  background: rgba(255, 255, 255, 0.07);
  border: 2px solid var(--line);
  border-radius: 14px;
}

input::placeholder { color: #9fc0a5; }
input:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }

.rail-search button,
.signup-form button {
  flex: none;
  min-height: 44px;
  padding: 0 16px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  background: var(--chrome);
  border: 2px solid var(--cyan);
  border-radius: 14px;
  cursor: pointer;
}
.rail-search button:hover,
.signup-form button:hover,
.rail-search button:focus-visible,
.signup-form button:focus-visible {
  filter: drop-shadow(0 0 9px var(--cyan));
  outline: none;
}

/* ============ 主体 ============ */
main {
  position: relative;
  z-index: 1;
  margin-left: 248px;
}

.wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 clamp(18px, 3.4vw, 56px);
}

/* ============ 首屏 ============ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px clamp(18px, 3.4vw, 56px) clamp(84px, 12vh, 132px);
  overflow: hidden;
  isolation: isolate;
}

.hero-stage {
  position: absolute;
  inset: 0;
  clip-path: polygon(0 0, 100% 0, 100% 89%, 0 100%);
  background: #0d1a10;
}

.slide {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  transition: opacity 0.85s ease;
}
.slide.is-on { opacity: 1; }

.shot {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  filter: saturate(1.14) contrast(1.06);
}

.stage-fallback {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 400px at 78% 18%, rgba(0, 255, 255, 0.4), transparent 65%),
    radial-gradient(600px 420px at 16% 84%, rgba(255, 95, 210, 0.42), transparent 66%),
    linear-gradient(140deg, #10301a, #172617 55%, #0c1a11);
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    270deg,
    rgba(8, 17, 10, 0.94) 0%,
    rgba(8, 17, 10, 0.7) 46%,
    rgba(8, 17, 10, 0.16) 82%
  );
}

.hero-band {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(44px, 8vh, 92px);
  z-index: 2;
  background: linear-gradient(90deg, var(--pink), var(--cyan) 48%, var(--green));
  clip-path: polygon(0 62%, 100% 0, 100% 44%, 0 100%);
  filter: drop-shadow(0 0 22px rgba(0, 255, 255, 0.4));
}

.hero-copy {
  position: relative;
  z-index: 3;
  text-align: right;
  margin-left: auto;
  max-width: min(760px, 100%);
}

.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(2.5rem, 6.2vw, 4.9rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: #fff;
  text-shadow:
    0 0 26px rgba(105, 255, 105, 0.55),
    4px 4px 0 rgba(0, 255, 255, 0.3);
  overflow-wrap: break-word;
}

.hero-copy .subtitle {
  margin: 0 0 0 auto;
  max-width: 40ch;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  color: #d8ffd9;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.8);
}

/* ============ 正文 + 侧栏 ============ */
.body-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 296px;
  gap: clamp(22px, 3vw, 44px);
  align-items: start;
  padding: clamp(30px, 5vw, 58px) 0 clamp(20px, 3vw, 34px);
}

.prose { min-width: 0; }

.prose > article {
  position: relative;
  margin: 0 0 26px;
  padding: 28px clamp(18px, 2.4vw, 32px) 30px;
  scroll-margin-top: 118px;
  border: 2px solid var(--edge);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.028);
}

.prose > article::before {
  content: "";
  position: absolute;
  left: 28px;
  top: -2px;
  width: 68px;
  height: 7px;
  border-radius: 0 0 9px 9px;
  background: linear-gradient(90deg, var(--pink), var(--cyan));
}

.prose h2 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 2.8vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #fff;
  text-shadow: 0 0 18px rgba(105, 255, 105, 0.42);
  overflow-wrap: break-word;
}

.prose h3 {
  margin: 22px 0 10px;
  font-size: 1.16rem;
  color: var(--green);
  overflow-wrap: break-word;
}

.prose p { color: #dcf6dd; }
.prose ul,
.prose ol { margin: 0 0 16px; padding-left: 1.3em; }
.prose li { margin: 0 0 8px; }
.prose strong { color: #fff; }
.prose img {
  border: 2px solid var(--line);
  border-radius: 20px;
  margin: 16px 0;
}

.prose blockquote {
  margin: 18px 0;
  padding: 14px 18px;
  border-left: 4px solid var(--pink);
  border-radius: 0 18px 18px 0;
  background: rgba(255, 95, 210, 0.09);
}

.prose a { color: var(--cyan); }

.side {
  position: sticky;
  top: 24px;
  align-self: start;
  padding: 22px 18px 24px;
  border: 2px solid var(--line);
  border-radius: 28px;
  background:
    radial-gradient(300px 160px at 84% -10%, rgba(0, 255, 255, 0.18), transparent 70%),
    rgba(255, 255, 255, 0.04);
}

.side h2 {
  margin: 0 0 8px;
  font-size: 1.22rem;
  line-height: 1.3;
  color: #fff;
  text-shadow: 0 0 14px rgba(0, 255, 255, 0.5);
}

.side .subtitle {
  margin: 0 0 16px;
  font-size: 15px;
  color: #a9dcae;
}

.side-links { display: flex; flex-direction: column; gap: 2px; }

.side-links a {
  display: flex;
  align-items: center;
  min-height: 42px;
  padding: 8px 10px;
  font-size: 16px;
  color: #d9ffdb;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 14px;
}
.side-links a:hover,
.side-links a:focus-visible {
  color: #fff;
  border-color: var(--cyan);
  background: rgba(0, 255, 255, 0.1);
}

/* ============ 订阅块 ============ */
.signup {
  max-width: 840px;
  margin: 20px auto clamp(40px, 6vw, 66px);
  padding: clamp(24px, 3vw, 34px);
  text-align: center;
  border: 2px dashed var(--green);
  border-radius: 28px;
  background:
    radial-gradient(620px 190px at 50% -24%, rgba(0, 255, 255, 0.16), transparent 72%),
    rgba(255, 255, 255, 0.035);
}

.signup h2 {
  margin: 0 0 8px;
  font-size: clamp(1.4rem, 2.6vw, 1.8rem);
  color: #fff;
  text-shadow: 0 0 16px rgba(105, 255, 105, 0.45);
}

.signup .subtitle {
  margin: 0 0 18px;
  font-size: 16px;
  color: #b9e6bd;
}

.signup-form {
  display: flex;
  gap: 8px;
  max-width: 460px;
  margin: 0 auto;
}
.signup-form input { flex: 1 1 auto; }

.signup-msg {
  min-height: 24px;
  margin: 14px 0 0;
  font-size: 16px;
  color: var(--green);
}

/* ============ 页脚 ============ */
.foot {
  position: relative;
  z-index: 1;
  max-width: 1240px;
  margin-left: 248px;
  padding: 30px clamp(18px, 3.4vw, 56px) 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 26px;
  border-top: 2px solid rgba(105, 255, 105, 0.28);
}

.foot-brand {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: 0.02em;
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 2px 14px;
  margin: 0;
}

.foot-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 16px;
  color: #cdeed0;
  text-decoration: none;
}
.foot-links a:hover,
.foot-links a:focus-visible { color: var(--cyan); text-decoration: underline; }

.foot small {
  grid-column: 1 / -1;
  display: block;
  padding-top: 10px;
  font-size: 15px;
  text-align: center;
  color: #9dbfa3;
}

/* ============ 动效 ============ */
.prose > article,
.side,
.signup,
.foot {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.prose > article.is-in,
.side.is-in,
.signup.is-in,
.foot.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .prose > article,
  .side,
  .signup,
  .foot { opacity: 1; transform: none; transition: none; }
  .slide { transition: none; }
}

/* ============ 移动端 ============ */
@media (max-width: 900px) {
  body::before { opacity: 0.5; }

  .rail {
    position: sticky;
    inset: 0 0 auto 0;
    width: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-right: 0;
    border-bottom: 2px solid var(--green);
    box-shadow: 0 10px 26px -18px rgba(105, 255, 105, 0.8);
  }

  .brand,
  .brand-mark { width: 44px; height: 44px; }
  .brand-mark::before,
  .brand-mark::after { top: 15px; width: 6px; height: 9px; }
  .brand-mark::before { left: 11px; }
  .brand-mark::after { right: 11px; }

  .rail-nav {
    flex: 1 1 0;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }
  .rail-nav::-webkit-scrollbar { display: none; }

  .rail-nav p {
    flex-direction: row;
    gap: 4px;
    width: max-content;
  }

  .rail-nav a {
    min-height: 44px;
    padding: 8px 12px;
    white-space: nowrap;
  }

  .rail-search {
    order: 3;
    flex: 1 0 100%;
    margin: 0;
  }

  main { margin-left: 0; }

  .hero {
    min-height: calc(100svh - 106px);
    padding-bottom: clamp(64px, 12vh, 96px);
  }

  .body-sec {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 26px;
  }

  .side { position: static; }

  .prose > article { scroll-margin-top: 128px; }

  .foot {
    margin-left: 0;
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .foot-links { justify-content: flex-start; }
  .foot small { text-align: left; }
}

@media (max-width: 460px) {
  body { font-size: 16px; }
  .hero-copy h1 { font-size: clamp(2.1rem, 10vw, 2.8rem); }
  .hero-copy .subtitle { font-size: 16px; }
  .prose > article { padding: 22px 16px 24px; border-radius: 24px; }
  .prose > article::before { left: 18px; width: 52px; }
  .signup-form { flex-wrap: wrap; }
  .signup-form input,
  .signup-form button { flex: 1 0 100%; }
}

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