/* =========================================================
   DeepSeek Harness Desktop 下载站
   设计语言：DeepSeek 蓝 + 终端青（Agent 会话质感）+ 咖啡琥珀（付费时刻）
   深色为默认，[data-theme="light"] 覆盖
   ========================================================= */

/* ===== 主题变量 ===== */
:root {
  --bg: #060a14;
  --bg-soft: #0b1220;
  --card: #0f1830;
  --card-2: #131e3a;
  --border: #1c2a4a;
  --text: #e8ecf6;
  --text-dim: #8595b0;
  --accent: #4d6bfe;
  --accent-strong: #3a5bf5;
  --cyan: #38bdf8;
  --coffee: #e7a94c;
  --success: #34d399;
  --danger: #f87171;
  --wx-green: #07c160;
  --ali-blue: #1677ff;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(2, 6, 18, 0.5);
  --glow: 0 0 0 1px rgba(77, 107, 254, 0.35), 0 12px 44px rgba(56, 128, 254, 0.16);
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

[data-theme="light"] {
  --bg: #f5f7fc;
  --bg-soft: #ffffff;
  --card: #ffffff;
  --card-2: #f0f4fb;
  --border: #dde4f0;
  --text: #15203a;
  --text-dim: #5c6b88;
  --accent: #3b5bf5;
  --accent-strong: #2b4bf0;
  --cyan: #0ea5e9;
  --coffee: #c47f1e;
  --success: #0d9f6e;
  --danger: #dc2626;
  --shadow: 0 12px 40px rgba(20, 40, 90, 0.1);
  --glow: 0 0 0 1px rgba(59, 91, 245, 0.25), 0 12px 40px rgba(59, 91, 245, 0.12);
}

/* ===== 基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
::selection { background: color-mix(in srgb, var(--accent) 40%, transparent); color: #fff; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== 导航栏 ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 16px; letter-spacing: 0.01em; }
.nav-logo svg { display: block; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-dim); font-size: 14px; font-weight: 500; transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }
.theme-toggle {
  background: var(--card); border: 1px solid var(--border); color: var(--text-dim);
  border-radius: 999px; padding: 8px 10px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.15s, color 0.15s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }

/* ===== Hero ===== */
.hero { padding: 92px 0 56px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto -10%; height: 560px;
  background:
    radial-gradient(560px 280px at 50% 0%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 70%),
    radial-gradient(420px 200px at 72% 12%, color-mix(in srgb, var(--cyan) 12%, transparent), transparent 70%);
  pointer-events: none;
}
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.22em;
  color: var(--cyan); text-transform: uppercase;
  background: color-mix(in srgb, var(--cyan) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--cyan) 28%, transparent);
  border-radius: 999px; padding: 6px 16px; margin-bottom: 26px;
}
.hero .eyebrow::before { content: "●"; font-size: 8px; color: var(--cyan); animation: pulse 2.2s ease-in-out infinite; }
.hero h1 {
  font-size: clamp(34px, 5.4vw, 58px); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.14;
}
.grad-text {
  background: linear-gradient(120deg, var(--accent) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .subtitle {
  color: var(--text-dim); font-size: clamp(16px, 2vw, 19px);
  margin: 22px auto 14px; max-width: 620px;
}
.dl-stats {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
  gap: 8px; margin: 0 auto 30px; font-size: 13px; color: var(--text-dim);
}
.dl-stats svg { width: 15px; height: 15px; opacity: 0.85; }
.dl-stats .dl-num { color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.dl-stats .dl-sep { opacity: 0.5; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #fff; font-weight: 700;
  border: none; border-radius: 999px; padding: 17px 48px; font-size: 17px;
  cursor: pointer; box-shadow: var(--glow);
  transition: transform 0.16s, box-shadow 0.16s, opacity 0.16s;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--glow), 0 16px 44px rgba(77, 107, 254, 0.28); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
.hero-badges { display: flex; gap: 12px; justify-content: center; margin-top: 26px; flex-wrap: wrap; }
.badge {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; padding: 6px 16px; font-size: 13px; color: var(--text-dim);
}

/* ===== Agent 会话面板（签名元素） ===== */
.agent-panel {
  max-width: 600px; margin: 56px auto 0; text-align: left;
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  box-shadow: var(--shadow); overflow: hidden;
}
.agent-panel-head {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 18px; border-bottom: 1px solid var(--border);
  background: var(--card-2);
}
.agent-panel-head .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.agent-panel-head .dot:nth-child(1) { background: color-mix(in srgb, var(--danger) 70%, transparent); }
.agent-panel-head .dot:nth-child(2) { background: color-mix(in srgb, var(--coffee) 70%, transparent); }
.agent-panel-head .dot:nth-child(3) { background: color-mix(in srgb, var(--success) 70%, transparent); }
.agent-title {
  margin-left: auto; font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim); letter-spacing: 0.04em;
}
.agent-lines { padding: 18px 20px 20px; font-family: var(--font-mono); font-size: 13.5px; }
.agent-line {
  display: flex; align-items: center; gap: 10px;
  color: var(--text-dim); padding: 6px 0; opacity: 0; animation: lineIn 0.45s ease forwards;
}
.agent-line:nth-child(1) { animation-delay: 0.35s; }
.agent-line:nth-child(2) { animation-delay: 0.65s; }
.agent-line:nth-child(3) { animation-delay: 0.95s; }
.agent-line:nth-child(4) { animation-delay: 1.25s; }
.agent-mark { width: 18px; text-align: center; font-size: 12px; }
.agent-line.is-done .agent-mark { color: var(--success); }
.agent-line.is-run { color: var(--text); }
.agent-line.is-run .agent-mark { color: var(--cyan); animation: pulse 1.6s ease-in-out infinite; }
.agent-cursor {
  display: inline-block; width: 8px; height: 15px; margin-left: 2px;
  background: var(--cyan); animation: blink 1.1s steps(1) infinite;
}

/* ===== 通用区块 ===== */
.section { padding: 76px 0; }
.section-head { text-align: center; margin-bottom: 46px; }
.section-eyebrow {
  font-size: 12px; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px; display: block;
}
.section-title { font-size: clamp(24px, 3vw, 34px); font-weight: 800; letter-spacing: -0.01em; margin-bottom: 12px; }
.section-sub { color: var(--text-dim); max-width: 560px; margin: 0 auto; }

/* ===== 特性卡片 ===== */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.feature-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: transform 0.16s, border-color 0.16s, box-shadow 0.16s;
}
.feature-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); box-shadow: var(--shadow); }
.feature-card .icon {
  width: 46px; height: 46px; border-radius: 12px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: var(--text-dim); font-size: 14px; }

/* ===== 截图区 ===== */
.screenshots { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.screenshot {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; aspect-ratio: 16 / 10;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim); font-size: 14px;
  transition: border-color 0.16s;
}
.screenshot img { width: 100%; height: 100%; object-fit: cover; }
.screenshot:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }

/* ===== 下载区 ===== */
.download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(195px, 1fr)); gap: 18px; max-width: 900px; margin: 0 auto; }
.platform-card {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 18px 24px; text-align: center;
  transition: border-color 0.16s, transform 0.16s, box-shadow 0.16s;
}
.platform-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.platform-card .icon {
  width: 52px; height: 52px; margin: 0 auto 14px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--cyan) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--cyan) 24%, transparent);
}
.platform-card .icon svg { width: 26px; height: 26px; }
.platform-card[data-platform="windows"] .icon svg { fill: #00adef; }
.platform-card[data-platform="macos_arm"] .icon svg,
.platform-card[data-platform="macos_intel"] .icon svg { fill: var(--text); }
.platform-card[data-platform="ios"] .icon svg { fill: var(--cyan); }
.platform-card[data-platform="android"] .icon svg { fill: #3ddc84; }
.platform-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.platform-card .meta { color: var(--text-dim); font-size: 12px; margin-bottom: 16px; }
.platform-card .download-btn {
  width: 100%; background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #fff; border: none; border-radius: 999px; padding: 11px 0; font-size: 14px;
  font-weight: 700; cursor: pointer; transition: opacity 0.15s, transform 0.15s;
}
.platform-card .download-btn:hover { opacity: 0.92; }
.platform-card .download-btn:disabled {
  background: var(--card-2); color: var(--text-dim); border: 1px dashed var(--border); cursor: not-allowed;
}
.platform-card.is-highlight { border-color: var(--accent); box-shadow: var(--glow); }
.platform-card.is-highlight::before {
  content: "推荐下载"; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(120deg, var(--accent), var(--cyan)); color: #fff;
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  border-radius: 999px; padding: 3px 14px; white-space: nowrap;
  box-shadow: 0 4px 14px rgba(77, 107, 254, 0.35);
}
.platform-card.is-soon { opacity: 0.72; }

/* ===== 教程 ===== */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.step {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: transform 0.16s, border-color 0.16s;
}
.step:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.step .num {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(120deg, var(--accent), var(--cyan)); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 800; margin-bottom: 16px;
  font-size: 15px;
}
.step h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.step p { color: var(--text-dim); font-size: 14px; }

/* ===== 评价 ===== */
.reviews { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.review {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px;
  transition: border-color 0.16s;
}
.review:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.review .quote { font-size: 14.5px; color: var(--text); margin-bottom: 16px; line-height: 1.8; }
.review .quote::before { content: "“"; color: var(--accent); font-size: 20px; font-weight: 800; }
.review .who { font-size: 13px; color: var(--text-dim); }

/* ===== FAQ ===== */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; background: var(--card); }
.faq-q {
  padding: 17px 22px; font-weight: 700; font-size: 15px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 12px; transition: color 0.15s;
}
.faq-q:hover { color: var(--accent); }
.faq-q::after { content: "+"; color: var(--text-dim); font-size: 19px; font-weight: 400; transition: transform 0.2s; }
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { padding: 0 22px 18px; color: var(--text-dim); font-size: 14px; display: none; }
.faq-item.open .faq-a { display: block; }

/* ===== 支付弹窗 ===== */
.modal-mask {
  position: fixed; inset: 0; background: rgba(3, 6, 16, 0.66); z-index: 100;
  display: none; align-items: center; justify-content: center; padding: 20px;
  backdrop-filter: blur(4px);
}
.modal-mask.open { display: flex; }
.modal {
  background: var(--card); border: 1px solid var(--border); border-radius: 20px;
  max-width: 420px; width: 100%; padding: 34px 32px 30px; position: relative; box-shadow: var(--shadow);
  animation: popIn 0.24s ease;
}
.modal h3 { font-size: 18px; font-weight: 800; margin-bottom: 4px; text-align: center; }
.modal .coffee-icon { font-size: 34px; text-align: center; margin-bottom: 6px; }
.modal .price {
  text-align: center; font-size: 38px; font-weight: 800; color: var(--coffee);
  margin: 8px 0 2px; letter-spacing: -0.02em;
}
.modal .price small { font-size: 15px; color: var(--text-dim); font-weight: 400; }
.modal .note { text-align: center; color: var(--text-dim); font-size: 13px; margin: 8px 0 24px; }
.pay-channels { display: flex; gap: 12px; }
.pay-btn {
  flex: 1; border: none; border-radius: 12px; padding: 13px 0; font-size: 15px;
  font-weight: 700; cursor: pointer; color: #fff; transition: opacity 0.15s, transform 0.15s;
}
.pay-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.pay-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.pay-btn[data-channel="wechat"] { background: var(--wx-green); }
.pay-btn[data-channel="alipay"] { background: var(--ali-blue); }
.pay-qr { text-align: center; }
.pay-channel-badge {
  display: block; width: fit-content; margin: 0 auto 14px;
  font-size: 13px; font-weight: 700; color: #fff;
  border-radius: 999px; padding: 4px 16px; letter-spacing: 0.04em;
}
.pay-channel-badge.wechat { background: var(--wx-green); }
.pay-channel-badge.alipay { background: var(--ali-blue); }
.pay-qr-box { position: relative; display: inline-block; }
.pay-qr-box img {
  width: 208px; height: 208px; border-radius: 12px;
  border: 2px solid var(--border); background: #fff; padding: 6px;
  transition: border-color 0.2s;
  display: block;
}
.pay-qr[data-channel="wechat"] .pay-qr-box img { border-color: var(--wx-green); }
.pay-qr[data-channel="alipay"] .pay-qr-box img { border-color: var(--ali-blue); }
.pay-qr-expired {
  position: absolute; inset: 0; border-radius: 12px;
  background: rgba(2, 6, 18, 0.92); color: #fff;
  display: none; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; letter-spacing: 0.06em;
}
.pay-qr-expired.show { display: flex; }
.pay-qr-box.is-expired img { filter: blur(20px) saturate(0.2); opacity: 0.2; }
.pay-qr .tip { color: var(--text-dim); font-size: 13px; margin-top: 14px; }
.pay-retry {
  display: none; margin-top: 14px; border: 1px solid var(--border);
  background: var(--card-2); color: var(--text); border-radius: 999px;
  padding: 9px 20px; font-size: 13px; font-weight: 700; cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.pay-retry.show { display: inline-block; }
.pay-retry:hover { border-color: var(--accent); color: var(--accent); }
.pay-status { text-align: center; color: var(--text-dim); font-size: 13px; margin-top: 16px; min-height: 20px; }
.modal-close {
  position: absolute; top: 14px; right: 16px; background: none; border: none;
  color: var(--text-dim); font-size: 22px; cursor: pointer; line-height: 1; transition: color 0.15s;
}
.modal-close:hover { color: var(--text); }
.pay-success { text-align: center; padding: 16px 0 6px; }
.pay-success .emoji { font-size: 54px; animation: popIn 0.4s ease; }
.pay-success h4 { font-size: 21px; font-weight: 800; margin: 14px 0 8px; }
.pay-success p { color: var(--text-dim); font-size: 14px; }

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--card); border: 1px solid var(--border); color: var(--text-dim);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow); opacity: 0; transform: translateY(12px);
  pointer-events: none; transition: opacity 0.2s, transform 0.2s, border-color 0.15s, color 0.15s;
}
.back-to-top svg { width: 19px; height: 19px; }
.back-to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { border-color: var(--accent); color: var(--accent); }

/* ===== 页脚 ===== */
.footer { border-top: 1px solid var(--border); padding: 44px 0 52px; text-align: center; }
.footer p { color: var(--text-dim); font-size: 13px; margin-bottom: 8px; }
.footer .footer-note {
  color: color-mix(in srgb, var(--text-dim) 55%, transparent); font-size: 12px;
}
.footer .disclaimer {
  color: color-mix(in srgb, var(--text-dim) 55%, transparent); font-size: 12px;
  max-width: 640px; margin: 18px auto 0; line-height: 1.8;
}

/* ===== 动效 ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes lineIn {
  from { opacity: 0; transform: translateX(-6px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes blink {
  0%, 55% { opacity: 1; }
  56%, 100% { opacity: 0; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.94) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.hero .eyebrow { animation: fadeUp 0.5s ease both; }
.hero h1 { animation: fadeUp 0.55s ease 0.08s both; }
.hero .subtitle { animation: fadeUp 0.55s ease 0.16s both; }
.hero .btn { animation: fadeUp 0.55s ease 0.24s both; }
.hero .hero-badges { animation: fadeUp 0.55s ease 0.32s both; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links a { display: none; }
  .hero { padding: 64px 0 40px; }
  .section { padding: 52px 0; }
  .agent-panel { margin-top: 40px; }
  .modal { padding: 30px 22px 26px; }
  .back-to-top { right: 16px; bottom: 16px; }
}