/* ============================================================
   DSH Launcher — 官网样式
   科技感深色主题：网格背景 + 蓝橙辉光 + 玻璃拟态卡片
   ============================================================ */

:root {
  --bg: #05070f;
  --bg-2: #0a0e1c;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-strong: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #eef1f8;
  --text-2: #a7afc4;
  --text-3: #6b7387;
  --blue: #4d6bfe;
  --blue-soft: #7d92ff;
  --cyan: #38d6f5;
  --orange: #ff6a3d;
  --green: #34d399;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(77, 107, 254, 0.4); }

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

.container {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.container-narrow { width: min(820px, calc(100% - 48px)); }

/* ---------- 背景装饰 ---------- */

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
}

.glow {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  pointer-events: none;
}

.glow-a {
  width: 560px; height: 560px;
  top: -220px; left: 8%;
  background: radial-gradient(circle, var(--blue), transparent 70%);
}

.glow-b {
  width: 460px; height: 460px;
  top: 30%; right: -180px;
  background: radial-gradient(circle, var(--orange), transparent 70%);
  opacity: 0.16;
}

/* ---------- 导航 ---------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(5, 7, 15, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-inner {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
}

.nav-brand em {
  font-style: normal;
  font-weight: 400;
  color: var(--text-2);
}

.nav-logo {
  width: 28px; height: 28px;
  border-radius: 7px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 24px;
  margin-left: auto;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-2);
  transition: color 0.2s;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-2);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.lang-toggle:hover { color: var(--text); border-color: var(--border-strong); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease,
    border-color 0.2s ease;
}

.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
  background: linear-gradient(135deg, var(--blue), #6a54f8);
  color: #fff;
  box-shadow: 0 8px 28px rgba(77, 107, 254, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 10px 36px rgba(77, 107, 254, 0.55);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--panel);
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover { background: var(--panel-strong); border-color: var(--border-strong); }

.btn-sm { padding: 8px 14px; font-size: 13px; border-radius: 9px; }

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

.hero {
  padding: 168px 0 96px;
  text-align: center;
}

.hero-badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--blue-soft);
  background: rgba(77, 107, 254, 0.1);
  border: 1px solid rgba(77, 107, 254, 0.32);
  border-radius: 999px;
  padding: 6px 14px;
}

.badge-dim {
  color: var(--text-3);
  background: var(--panel);
  border-color: var(--border);
}

.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero-title {
  font-size: clamp(34px, 5.6vw, 62px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.grad {
  background: linear-gradient(100deg, var(--blue-soft) 0%, var(--cyan) 55%, var(--orange) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  max-width: 680px;
  margin: 0 auto 36px;
  font-size: 17px;
  color: var(--text-2);
}

.hero-cta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 16px;
}

.hero-note {
  font-size: 13px;
  color: var(--text-3);
  font-family: var(--mono);
  letter-spacing: 0.02em;
}

/* Hero 截图窗口 */

.hero-shot { margin-top: 72px; }

.shot-frame {
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  overflow: hidden;
  background: var(--bg-2);
  box-shadow:
    0 40px 120px rgba(0, 0, 0, 0.6),
    0 0 80px rgba(77, 107, 254, 0.12);
  /* 截图为 1520x1024（760pt 窗口的 2x 输出）：760 CSS px 正好是
     2x retina 的 1:1 像素映射，任何放大都会产生模糊，请勿调大 */
  max-width: 760px;
  margin: 0 auto;
}

.shot-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.shot-dot { width: 11px; height: 11px; border-radius: 50%; }
.shot-dot.r { background: #ff5f57; }
.shot-dot.y { background: #febc2e; }
.shot-dot.g { background: #28c840; }

.shot-title {
  margin: 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-3);
  transform: translateX(-22px);
}

.shot-frame img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 通用区块 ---------- */

.section { padding: 96px 0; }

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--blue-soft);
  margin-bottom: 14px;
  text-align: center;
}

.section-title {
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 800;
  letter-spacing: -0.015em;
  text-align: center;
  margin-bottom: 18px;
  line-height: 1.25;
}

.section-sub {
  max-width: 720px;
  margin: 0 auto 56px;
  text-align: center;
  color: var(--text-2);
  font-size: 16px;
}

/* ---------- 「薄，是故意的」 ---------- */

.thin { background: linear-gradient(180deg, transparent, rgba(77, 107, 254, 0.05) 50%, transparent); }

.thin-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.thin-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: border-color 0.25s, transform 0.25s, background 0.25s;
}

.thin-card:hover {
  border-color: rgba(255, 106, 61, 0.4);
  transform: translateY(-4px);
  background: var(--panel-strong);
}

.thin-x {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--orange);
  background: rgba(255, 106, 61, 0.12);
  border: 1px solid rgba(255, 106, 61, 0.3);
  margin-bottom: 18px;
}

.thin-card h3 { font-size: 17px; margin-bottom: 10px; }
.thin-card p { font-size: 14px; color: var(--text-2); }

/* ---------- 步骤 ---------- */

.steps {
  display: flex;
  align-items: stretch;
  gap: 16px;
  margin-bottom: 64px;
}

.step {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: border-color 0.25s, transform 0.25s;
}

.step:hover { border-color: rgba(77, 107, 254, 0.45); transform: translateY(-4px); }

.step-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.15em;
  margin-bottom: 14px;
}

.step h3 { font-size: 18px; margin-bottom: 10px; }
.step p { font-size: 14px; color: var(--text-2); }

.step-arrow {
  align-self: center;
  color: var(--text-3);
  font-size: 22px;
  flex-shrink: 0;
}

/* 终端 */

.terminal {
  max-width: 760px;
  margin: 0 auto;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  overflow: hidden;
  background: #070a14;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.terminal-title {
  margin: 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-3);
  transform: translateX(-22px);
}

.terminal pre {
  padding: 22px 26px;
  overflow-x: auto;
}

.terminal code {
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 2;
  color: var(--text-2);
}

.t-ok { color: var(--green); }
.t-hl { color: var(--cyan); }
.t-dim { color: var(--text-3); }

/* ---------- 截图画廊 ---------- */

.shot-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.shot-gallery figure {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-2);
  transition: border-color 0.25s, transform 0.25s;
}

.shot-gallery figure:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
}

.shot-gallery img {
  display: block;
  width: 100%;
  height: auto;
}

.shot-gallery figcaption {
  padding: 14px 18px;
  font-size: 13px;
  color: var(--text-3);
  border-top: 1px solid var(--border);
}

/* ---------- 特性卡片 ---------- */

.feat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color 0.25s, transform 0.25s, background 0.25s;
}

.feat-card:hover {
  border-color: rgba(77, 107, 254, 0.45);
  transform: translateY(-4px);
  background: var(--panel-strong);
}

.feat-icon {
  width: 40px; height: 40px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: var(--blue-soft);
  background: rgba(77, 107, 254, 0.12);
  border: 1px solid rgba(77, 107, 254, 0.28);
  margin-bottom: 16px;
}

.feat-icon svg { width: 20px; height: 20px; }

.feat-card h3 { font-size: 16px; margin-bottom: 8px; }
.feat-card p { font-size: 13.5px; color: var(--text-2); }

/* ---------- 下载 ---------- */

.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 26px;
}

.dl-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.dl-card:hover {
  border-color: rgba(77, 107, 254, 0.55);
  transform: translateY(-4px);
  box-shadow: 0 18px 50px rgba(77, 107, 254, 0.18);
}

.dl-card.recommended {
  border-color: rgba(56, 214, 245, 0.55);
  box-shadow: 0 0 40px rgba(56, 214, 245, 0.12);
}

.dl-rec {
  display: none;
  position: absolute;
  top: -11px;
  right: 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #05222b;
  background: var(--cyan);
  border-radius: 999px;
  padding: 3px 12px;
}

.dl-card.recommended .dl-rec { display: inline-block; }

.dl-os { font-size: 20px; font-weight: 700; }
.dl-arch { font-size: 14px; color: var(--text-2); }

.dl-file {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-3);
  margin: 10px 0 18px;
  word-break: break-all;
}

.dl-btn {
  display: inline-flex;
  justify-content: center;
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  padding: 11px 0;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), #6a54f8);
  color: #fff;
  transition: box-shadow 0.2s;
}

.dl-card:hover .dl-btn { box-shadow: 0 6px 22px rgba(77, 107, 254, 0.45); }

.dl-note {
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
  max-width: 720px;
  margin: 0 auto;
}

.dl-note a {
  color: var(--blue-soft);
  display: inline-block;
  margin-top: 6px;
}

.dl-note a:hover { text-decoration: underline; }

/* ---------- FAQ ---------- */

.faq-list { display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0 24px;
  transition: border-color 0.2s;
}

.faq-item[open] { border-color: rgba(77, 107, 254, 0.4); }

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 0;
  font-size: 15.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 18px;
  color: var(--text-3);
  transition: transform 0.2s;
  flex-shrink: 0;
}

.faq-item[open] summary::after { transform: rotate(45deg); color: var(--blue-soft); }

.faq-item p {
  padding: 0 0 20px;
  font-size: 14px;
  color: var(--text-2);
}

/* ---------- 页脚 ---------- */

.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
  background: rgba(255, 255, 255, 0.015);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

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

.footer-note {
  font-size: 13px;
  color: var(--text-3);
  max-width: 640px;
}

.footer-links { display: flex; gap: 22px; }

.footer-links a {
  font-size: 13.5px;
  color: var(--text-2);
  transition: color 0.2s;
}

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

/* ---------- 入场动画 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .thin-grid, .dl-grid { grid-template-columns: 1fr; }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .shot-gallery { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .feat-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 132px; }
  .section { padding: 64px 0; }
  .hero-cta .btn { width: 100%; justify-content: center; }
}