:root {
  --bg: #070b10;
  --bg-2: #0b1219;
  --card: #0f1720;
  --border: #1d2936;
  --text: #e8f0f7;
  --dim: #9fb0c0;
  --faint: #6b7d8f;
  --accent: #35e6c4;
  --accent-2: #7ef0d8;
  --danger: #ff6b6b;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: radial-gradient(1200px 600px at 70% -10%, rgba(53, 230, 196, 0.12), transparent 60%), var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

.accent {
  color: var(--accent);
}

.muted {
  color: var(--faint);
}

.small {
  font-size: 12px;
}

/* -------------------------------- 顶栏 -------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px clamp(16px, 5vw, 64px);
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 16, 0.72);
  border-bottom: 1px solid rgba(29, 41, 54, 0.7);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.nav {
  display: flex;
  gap: 22px;
  margin-left: 12px;
  color: var(--dim);
  font-size: 14px;
}

.nav a:hover {
  color: var(--text);
}

.topbar .btn {
  margin-left: auto;
}

/* -------------------------------- 按钮 -------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}

.btn:hover {
  border-color: rgba(53, 230, 196, 0.45);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(180deg, #3ff0cd, #27cdae);
  border-color: transparent;
  color: #04211c;
}

.btn-primary:hover {
  background: linear-gradient(180deg, #55f5d6, #2fd8b7);
}

.btn-lg {
  padding: 13px 26px;
  font-size: 15px;
  border-radius: 12px;
}

/* -------------------------------- Hero -------------------------------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 40px;
  align-items: center;
  padding: clamp(40px, 7vw, 90px) clamp(16px, 5vw, 64px);
}

.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(36px, 5.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 0 26px;
  max-width: 34em;
  color: var(--dim);
  font-size: 16px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.version {
  font-size: 13px;
  color: var(--faint);
}

.hero-points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 20px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  color: var(--dim);
  font-size: 13.5px;
}

.hero-points li::before {
  content: '✓';
  color: var(--accent);
  margin-right: 8px;
}

.shot {
  border-radius: 16px;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
  background: var(--bg-2);
}

.shot img {
  width: 100%;
  height: auto;
}

/* -------------------------------- 区块 -------------------------------- */

.section {
  padding: clamp(48px, 7vw, 96px) clamp(16px, 5vw, 64px);
}

.section-alt {
  background: linear-gradient(180deg, rgba(15, 23, 32, 0.65), transparent);
  border-top: 1px solid rgba(29, 41, 54, 0.6);
  border-bottom: 1px solid rgba(29, 41, 54, 0.6);
}

.section h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: -0.01em;
}

.section-sub {
  margin: 0 0 26px;
  color: var(--dim);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.card {
  padding: 20px 22px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.01));
}

.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.card p {
  margin: 0;
  color: var(--dim);
  font-size: 13.5px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

.ticks {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  color: var(--dim);
}

.ticks li {
  margin: 7px 0;
}

.ticks li::before {
  content: '✓';
  color: var(--accent);
  margin-right: 9px;
}

/* -------------------------------- 下载 -------------------------------- */

.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 26px 28px;
  border-radius: 16px;
  border: 1px solid rgba(53, 230, 196, 0.35);
  background: linear-gradient(180deg, rgba(53, 230, 196, 0.1), rgba(53, 230, 196, 0.02));
  margin-top: 22px;
}

.dl-version {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.dl-note {
  margin: 6px 0 0;
  color: var(--dim);
}

.dl-meta {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--faint);
  word-break: break-all;
  font-family: ui-monospace, Consolas, monospace;
}

.fineprint {
  margin: 16px 0 0;
  font-size: 12.5px;
  color: var(--faint);
  max-width: 60em;
}

/* ------------------------------ 更新日志 ------------------------------ */

.changelog {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
}

.release {
  padding: 16px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.025);
}

.release-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.release-version {
  font-weight: 700;
}

.release-date,
.release-size {
  font-size: 12px;
  color: var(--faint);
}

.release-notes {
  margin: 8px 0 0;
  color: var(--dim);
  font-size: 13.5px;
  white-space: pre-wrap;
}

/* -------------------------------- 表单 -------------------------------- */

.form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 720px;
  margin-top: 22px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 12.5px;
  color: var(--dim);
}

.form input,
.form select,
.form textarea {
  width: 100%;
  padding: 11px 13px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  resize: vertical;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: rgba(53, 230, 196, 0.55);
}

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

/* -------------------------------- 页脚 -------------------------------- */

.footer {
  border-top: 1px solid rgba(29, 41, 54, 0.7);
  padding: 30px clamp(16px, 5vw, 64px);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-inner p {
  margin: 4px 0 0;
}

.footer-links {
  display: flex;
  gap: 20px;
  color: var(--dim);
  font-size: 13.5px;
}

.footer-links a:hover {
  color: var(--text);
}

/* -------------------------------- 响应式 -------------------------------- */

@media (max-width: 900px) {
  .hero,
  .split {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .hero-points {
    grid-template-columns: 1fr;
  }
}