/* ============================================
   承序电子商务软件商城 — 专业科研工具风格
   ============================================ */

:root {
  --bg: #f4f6f9;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --text: #1a2332;
  --text-secondary: #5a6a7e;
  --text-muted: #8b9aab;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --accent: #1d4ed8;
  --accent-hover: #1e40af;
  --accent-soft: #eff4ff;
  --success: #059669;
  --success-soft: #ecfdf5;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --refund: #b26a00;
  --refund-soft: #fff4e5;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 1px 3px rgba(26, 35, 50, 0.06), 0 4px 16px rgba(26, 35, 50, 0.04);
  --shadow-md: 0 4px 24px rgba(26, 35, 50, 0.08);
  --header-h: 64px;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
  --max-w: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}

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

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

h1,
h2,
h3,
h4 {
  margin: 0 0 0.5em;
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 1em;
  color: var(--text-secondary);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(226, 232, 240, 0.6),
    0 10px 28px -20px rgba(15, 23, 42, 0.28);
}

.header-inner {
  max-width: var(--max-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  white-space: nowrap;
}

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

.logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
}

.logo-mark {
  display: none; /* 图片 logo 已取代文字方块 */
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}

.nav a:hover,
.nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85rem;
}

/* ---------- Main ---------- */
.main {
  flex: 1;
  width: 100%;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px 64px;
}

.page-header {
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.page-header p {
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(29, 78, 216, 0.07), transparent),
    radial-gradient(ellipse 50% 40% at 5% 85%, rgba(29, 78, 216, 0.04), transparent),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 88px 24px 96px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 12px;
  border-radius: 6px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 16px;
  color: var(--text);
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-visual {
  position: relative;
  height: 320px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(160deg, #1e293b 0%, #0f172a 55%, #101b2e 100%);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.03) 50%, transparent 100%);
  background-size: 200% 100%;
  animation: shimmer 8s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0%,
  100% {
    background-position: 100% 0;
  }
  50% {
    background-position: -100% 0;
  }
}

.terminal-bar {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.terminal-dot:nth-child(1) {
  background: #f87171;
}
.terminal-dot:nth-child(2) {
  background: #fbbf24;
}
.terminal-dot:nth-child(3) {
  background: #34d399;
}

.terminal-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #94a3b8;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.terminal-code .kw {
  color: #67e8f9;
}
.terminal-code .str {
  color: #86efac;
}
.terminal-code .cm {
  color: #64748b;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  position: relative;
  z-index: 1;
}

.hero-stat {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}

.hero-stat strong {
  display: block;
  color: #fff;
  font-size: 1.15rem;
  font-weight: 700;
}

.hero-stat span {
  font-size: 0.72rem;
  color: #94a3b8;
}

/* ---------- Features ---------- */
.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.section-title p {
  margin: 0;
  font-size: 0.95rem;
}

/* 不对称网格：打破"三张相同卡片"的模板感
   前两张 1.4fr/0.8fr 并排，第三张通栏（宽度差异 + 焦点卡片） */
.feature-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 24px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.feature {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.feature:last-child {
  grid-column: 1 / -1;
  padding: 24px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.feature:last-child .feature-icon {
  flex-shrink: 0;
  margin-bottom: 0;
}

.feature:last-child h3 {
  margin-bottom: 2px;
}

.feature:hover {
  border-color: #bcd0f2;
  box-shadow: 0 6px 20px -8px rgba(29, 78, 216, 0.18);
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.feature h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.feature p {
  margin: 0;
  font-size: 0.9rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  text-decoration: none;
  line-height: 1.4;
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  color: #fff;
  box-shadow: 0 4px 14px rgba(29, 78, 216, 0.3);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-alt);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  padding: 11px 16px;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--accent-soft);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.85rem;
}

/* ---------- 产品分类导航 ---------- */
.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
}

.category-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.18s, color 0.18s, background 0.18s, box-shadow 0.18s;
}

.category-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.category-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px -5px rgba(29, 78, 216, 0.5);
}

.category-btn .count {
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1;
  background: rgba(15, 23, 42, 0.06);
  border-radius: 999px;
  padding: 3px 8px;
  min-width: 22px;
  text-align: center;
}

.category-btn.active .count {
  background: rgba(255, 255, 255, 0.24);
}

/* ---------- 分类分组展示 ---------- */
.category-group {
  margin-bottom: 44px;
}

.category-group:last-child {
  margin-bottom: 0;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
}

.category-title::before {
  content: "";
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: var(--accent);
}

.category-count {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-alt);
  border-radius: 999px;
  padding: 2px 10px;
}

/* 小屏：分类导航可横向滚动 */
@media (max-width: 640px) {
  .category-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

  .category-nav::-webkit-scrollbar {
    display: none;
  }

  .category-btn {
    flex-shrink: 0;
  }
}

/* ---------- Product cards ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  animation: fadeUp 0.45s ease both;
}

.product-card:hover {
  border-color: #bfdbfe;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.product-card .tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
  width: fit-content;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.product-card h2,
.product-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.product-card .desc {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card .meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.product-card .price {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.product-card .price small {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ---------- Product detail ---------- */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  align-items: start;
}

.detail-main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.detail-main h1 {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.detail-desc {
  font-size: 1rem;
  line-height: 1.75;
  white-space: pre-wrap;
}

.detail-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}

.detail-sidebar .price-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.detail-sidebar .price {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.detail-sidebar .btn {
  margin-bottom: 10px;
}

.detail-info-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.detail-info-list li {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  padding: 8px 0;
  color: var(--text-secondary);
}

.detail-info-list li span:last-child {
  color: var(--text);
  font-weight: 500;
}

/* ---------- Forms / panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 520px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.panel-wide {
  max-width: 640px;
}

.panel h1 {
  font-size: 1.4rem;
  margin-bottom: 8px;
  text-align: center;
}

.panel-sub {
  text-align: center;
  margin-bottom: 28px;
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.form-group .hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
}

input[type="text"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 11px 14px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.12);
  background: var(--surface);
}

/* Platform select ---------- */
.platform-opts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.platform-opt {
  position: relative;
  cursor: pointer;
}

.platform-opt input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.platform-opt .opt-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 18px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color 0.15s, background 0.15s;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.platform-opt input:checked + .opt-card {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.platform-opt .opt-icon {
  font-size: 1.5rem;
  line-height: 1;
}

/* ---------- Payment / QR ---------- */
.qr-box {
  text-align: center;
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: none;
}

.qr-box.visible {
  display: block;
  animation: fadeUp 0.4s ease;
}

.qr-box img {
  width: 220px;
  height: 220px;
  margin: 16px auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  background: #fff;
  object-fit: contain;
}

.qr-box .qr-iframe {
  /* 比支付宝二维码实际尺寸（200×200）大一点，避免容器大于二维码出现间隙 */
  width: 206px;
  height: 206px;
  margin: 16px auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  display: block;
}

.order-id {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg);
  padding: 10px 14px;
  border-radius: 8px;
  word-break: break-all;
  color: var(--text);
  margin: 12px 0;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
}

.status-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.status-pending {
  background: var(--warning-soft);
  color: var(--warning);
}

.status-paid {
  background: var(--success-soft);
  color: var(--success);
}

/* 已退款（全额 / 部分）：琥珀色，区别于待支付/已支付/已超时 */
.status-refunded {
  background: var(--refund-soft);
  color: var(--refund);
}

.status-failed,
.status-closed,
.status-expired {
  background: var(--danger-soft);
  color: var(--danger);
}

.status-unknown {
  background: var(--bg-alt);
  color: var(--text-secondary);
}

.polling-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 12px;
}

.polling-hint .dot {
  display: inline-block;
  animation: blink 1.2s infinite;
}

/* 二维码有效期倒计时条 */
.qr-countdown {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 4px auto 0;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--warning-soft);
  color: var(--warning);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

.qr-countdown .qr-countdown-icon {
  font-size: 0.95rem;
  line-height: 1;
}

.qr-countdown.warning {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: rgba(220, 38, 38, 0.3);
  animation: blink 1.2s infinite;
}

.qr-countdown.expired {
  animation: none;
}

/* 二维码失效：半透明置灰，防止误扫旧订单 */
.qr-img-expired {
  opacity: 0.35;
  filter: grayscale(0.8);
}

/* 二维码失效提示 */
.qr-expired-hint {
  max-width: 420px;
  margin: 12px auto 0;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.6;
  border: 1px solid rgba(220, 38, 38, 0.3);
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}

/* ---------- Result box ---------- */
.result-box {
  margin-top: 24px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  display: none;
}

.result-box.visible {
  display: block;
  animation: fadeUp 0.35s ease;
}

.result-box.success {
  background: var(--success-soft);
  border-color: #a7f3d0;
}

.result-box.error {
  background: var(--danger-soft);
  border-color: #fecaca;
}

/* 查询结果操作区（复制授权码等） */
.result-actions {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  display: flex;
  justify-content: center;
  gap: 10px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.result-row:last-child {
  border-bottom: none;
}

.result-row .label {
  color: var(--text-muted);
  flex-shrink: 0;
}

.result-row .value {
  color: var(--text);
  font-weight: 500;
  text-align: right;
  word-break: break-all;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ---------- Empty / loading / error ---------- */
.state-box {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-muted);
}

.state-box .icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- Success page ---------- */
.success-panel {
  text-align: center;
  padding: 48px 32px;
}

.success-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--success-soft);
  color: var(--success);
  display: grid;
  place-items: center;
  font-size: 2rem;
  margin: 0 auto 24px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 40px 24px 28px;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 8px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: #fff;
}

.footer-copy {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-top: 20px;
  font-size: 0.8rem;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* 注脚备案链接：公司名 / ICP 备案 / 公安备案 样式一致 */
.footer-icp {
  margin-left: 0;
}

.footer-icp a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #64748b;
  font-size: 0.75rem;
  text-decoration: none;
  transition: color 0.15s;
}

.footer-icp a:hover {
  color: #e2e8f0;
}

/* 公安备案图标（国徽）：保持原图比例，小尺寸显示 */
.beian-icon {
  height: 13px;
  width: auto;
  display: inline-block;
  flex-shrink: 0;
  vertical-align: middle;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1e293b;
  color: #fff;
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 1000;
  max-width: 90vw;
}

.toast--show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast--error {
  background: #991b1b;
}

.toast--success {
  background: #065f46;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb span {
  margin: 0 8px;
  color: var(--border-strong);
}

/* ---------- Responsive ---------- */
/* 中屏：内容区随侧边栏（默认已收缩为图标模式）适配 */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    padding: 56px 24px 64px;
  }

  .hero-visual {
    height: 260px;
    order: -1;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .detail-layout {
    grid-template-columns: 1fr;
  }

  .detail-sidebar {
    position: static;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-toggle {
    display: block;
  }

  .nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px;
    gap: 4px;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    width: 100%;
    padding: 12px 16px;
  }

  .logo-text {
    font-size: 0.9rem;
  }

  .container {
    padding: 28px 16px 48px;
  }

  .panel {
    padding: 24px 20px;
  }

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

/* ============================================
   承序软件商城 — v3 视觉美化增强
   ============================================ */

/* ---------- Logo 图片 ----------
   与文字方块共存：图片正常时显示图片，加载失败回退到文字 mark */
.logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
  background: transparent;
}

/* ---------- 注脚 ICP 备案 ---------- */
.footer-icp {
  margin-left: 10px;
}

.footer-icp a {
  color: #64748b;
  font-size: 0.75rem;
  text-decoration: none;
  transition: color 0.15s;
}

.footer-icp a:hover {
  color: #e2e8f0;
}

/* ---------- 全局细节 ---------- */
::selection {
  background: rgba(29, 78, 216, 0.18);
  color: var(--text);
}

/* 页面背景微渐变（科研质感） */
.main {
  background:
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(29, 78, 216, 0.045), transparent),
    radial-gradient(ellipse 50% 36% at 0% 100%, rgba(30, 64, 175, 0.035), transparent);
  animation: pageIn 0.35s ease both;
}

@keyframes pageIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ---------- 主按钮：克制纯色（单一品牌蓝，无渐变噱头） ---------- */
.btn-primary {
  background: var(--accent);
  transition: background-color 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 10px 24px -8px rgba(29, 78, 216, 0.4);
  transform: translateY(-1px);
}

/* ---------- Feature 卡片 ---------- */
.feature {
  position: relative;
  overflow: hidden;
}

.feature::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.feature:hover::after {
  transform: scaleX(1);
}

.feature:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #bfdbfe;
}

/* ---------- 产品卡片顶部高亮 ---------- */
.product-card {
  position: relative;
}

.product-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.25s;
}

.product-card:hover::before {
  opacity: 1;
}

/* ---------- 面板微质感 ---------- */
.panel {
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  border-color: #e2e8f0;
}

/* ---------- 输入框 hover ---------- */
input[type="text"]:hover,
input[type="search"]:hover,
select:hover,
textarea:hover {
  border-color: var(--accent);
}

/* ---------- Footer 渐变顶边 ---------- */
.site-footer {
  background: linear-gradient(180deg, #0f172a 0%, #0b1220 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background-color: #94a3b8;
}

::-webkit-scrollbar-track {
  background: transparent;
}

/* ============================================
   承序软件商城 — 支付页品牌化
   ============================================ */

/* ---------- 支付方式卡片 ---------- */
.platform-opt .opt-card {
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 14px;
}

.platform-opt .opt-icon {
  display: grid;
  place-items: center;
  font-size: 0; /* 图标改为 SVG */
}

.platform-opt .opt-icon svg {
  width: 46px;
  height: 46px;
  display: block;
  border-radius: 12px;
  box-shadow: 0 4px 12px -4px rgba(15, 23, 42, 0.18);
  transition: transform 0.2s;
}

.platform-opt:hover .opt-icon svg {
  transform: translateY(-2px) scale(1.04);
}

.platform-opt .opt-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}

.platform-opt .opt-sub {
  font-size: 0.74rem;
  font-weight: 400;
  color: var(--text-muted);
  line-height: 1.2;
}

/* 支付宝：品牌蓝 */
.platform-opt[data-brand="alipay"] .opt-card:hover {
  border-color: #1677ff;
}

.platform-opt[data-brand="alipay"] input:checked + .opt-card {
  border-color: #1677ff;
  background: #f0f7ff;
  box-shadow: 0 6px 18px -8px rgba(22, 119, 255, 0.45);
}

.platform-opt[data-brand="alipay"] input:checked + .opt-card .opt-name {
  color: #1677ff;
}

/* 微信支付：品牌绿 */
.platform-opt[data-brand="wechat"] .opt-card:hover {
  border-color: #07c160;
}

.platform-opt[data-brand="wechat"] input:checked + .opt-card {
  border-color: #07c160;
  background: #f0fdf6;
  box-shadow: 0 6px 18px -8px rgba(7, 193, 96, 0.45);
}

.platform-opt[data-brand="wechat"] input:checked + .opt-card .opt-name {
  color: #07c160;
}

/* ---------- 二维码品牌徽标 ---------- */
.qr-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
  padding: 10px 18px;
  border-radius: 12px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  animation: fadeUp 0.35s ease both;
}

.qr-brand svg {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  flex-shrink: 0;
}

.qr-box.pay-alipay .qr-brand {
  background: linear-gradient(135deg, #eef6ff 0%, #f7fbff 100%);
  color: #1677ff;
  border: 1px solid rgba(22, 119, 255, 0.2);
}

.qr-box.pay-wechat .qr-brand {
  background: linear-gradient(135deg, #ecfdf4 0%, #f7fefb 100%);
  color: #07c160;
  border: 1px solid rgba(7, 193, 96, 0.22);
}

/* 二维码边框随品牌色 */
.qr-box.pay-alipay img {
  border-color: rgba(22, 119, 255, 0.35);
  box-shadow: 0 8px 24px -12px rgba(22, 119, 255, 0.4);
}

.qr-box.pay-wechat img {
  border-color: rgba(7, 193, 96, 0.35);
  box-shadow: 0 8px 24px -12px rgba(7, 193, 96, 0.4);
}

/* ---------- 支付成功页 ---------- */
.success-icon {
  background: linear-gradient(135deg, #059669 0%, #10b981 60%, #34d399 100%);
  color: #fff;
  box-shadow: 0 14px 32px -10px rgba(5, 150, 105, 0.5);
  animation: popIn 0.5s cubic-bezier(0.2, 1.4, 0.4, 1) both;
}

@keyframes popIn {
  from {
    transform: scale(0.4);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.success-panel .panel-sub {
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   承序软件商城 — taste 精修（设计校准，仅样式层）
   ============================================ */

/* CTA 按钮文案单行（不换行） */
.btn {
  white-space: nowrap;
}

/* 标题层级：用字重 + 字距控制层级，不靠狂放大字号 */
h1 {
  letter-spacing: -0.03em;
  font-weight: 700;
}
h2 {
  letter-spacing: -0.025em;
  font-weight: 650;
}
h3 {
  letter-spacing: -0.02em;
  font-weight: 600;
}

/* 键盘焦点可见环（无障碍） */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 阴影统一带品牌色调（非纯黑，提升质感） */
.panel,
.detail-sidebar,
.detail-main,
.product-card,
.feature,
.toast {
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05),
    0 8px 24px -12px rgba(29, 78, 216, 0.12);
}

/* 状态徽章：inner-ring 层次，圆点加光晕 */
.status-badge {
  box-shadow: inset 0 0 0 1px currentColor;
}
.status-badge::before {
  box-shadow: 0 0 0 3px currentColor;
  opacity: 0.35;
}

/* 分割线更轻，避免"每条都画线"的密集感 */
.result-row {
  border-bottom-color: rgba(15, 23, 42, 0.05);
}

/* 动效克制：尊重系统"减少动态"偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* 触摸反馈：按下轻压，松手回弹 */
.btn:active:not(:disabled) {
  transform: translateY(1px) scale(0.98);
}
.product-card:active {
  transform: translateY(0) scale(0.995);
}

/* ============================================================
   承序 · v4「精密工程 Precision」视觉重塑（仅样式层）
   —— 目标：脱离"模板站"观感，建立 科研仪器 / 工程蓝图 品牌语言
   —— 原则：只覆盖样式；不改 HTML 结构、不改 JS 逻辑、不改 class / id
   ============================================================ */

/* ---------- 1) 设计令牌：单一品牌色 + 冷调中性 + 工程母题 ---------- */
:root {
  /* 品牌主线：精密工程蓝（冷、沉、克制，替代偏"AI 蓝"的 indigo） */
  --accent: #0e5d94;
  --accent-hover: #0a4a77;
  --accent-soft: #e9f3fa;
  --accent-line: rgba(14, 93, 148, 0.28);
  --accent-ink: #07304f;

  /* 全站冷调中性（统一色相，避免冷暖灰混用） */
  --bg: #f2f5f8;
  --bg-alt: #e8eef4;
  --surface: #ffffff;
  --text: #111c2b;
  --text-secondary: #4b5a6d;
  --text-muted: #7c8a9b;
  --border: #dce4ee;
  --border-strong: #c2cddb;

  /* 工程网格母题（浅底叠纹） */
  --grid-line: rgba(17, 28, 43, 0.05);
  --grid-bg:
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 26px 26px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 26px 26px;

  /* 阴影：统一冷调品牌色，单一光源（上柔下重） */
  --shadow: 0 1px 2px rgba(9, 30, 66, 0.05),
    0 10px 26px -16px rgba(14, 93, 148, 0.22);
  --shadow-md: 0 2px 4px rgba(9, 30, 66, 0.06),
    0 18px 40px -22px rgba(14, 93, 148, 0.32);

  /* 圆角收紧，更"工程"而非"圆润卡片" */
  --radius: 8px;
  --radius-lg: 12px;

  --max-w: 1160px;
}

/* ---------- 2) 页面底纹：极淡工程网格，替代原"双径向 AI 渐变" ---------- */
body {
  background-color: var(--bg);
  background-image: var(--grid-bg);
}

.main {
  background: transparent;
}

/* ---------- 3) Header：顶部品牌标线 + 精密分隔 ---------- */
.site-header {
  background: rgba(252, 253, 255, 0.86);
  border-bottom: 1px solid var(--border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 12px 30px -22px rgba(14, 93, 148, 0.35);
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #1f8ac9 60%, var(--accent));
  opacity: 0.9;
  pointer-events: none;
}

.nav a.active {
  color: var(--accent-ink);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--accent-line);
}

/* ---------- 4) Hero：工程蓝图底纹（网格），去掉双径向渐变 ---------- */
.hero {
  background-color: #fbfdff;
  background-image: var(--grid-bg);
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  border: 1px solid var(--accent-line);
  border-radius: 6px;
}

.hero h1 {
  letter-spacing: -0.035em;
}

/* 终端视觉：仪器面板质感（细网格 + 品牌描边） */
.hero-visual {
  background-color: #0c1622;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px) 0 0 / 22px 22px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px) 0 0 / 22px 22px;
  border: 1px solid rgba(120, 180, 226, 0.18);
  box-shadow: 0 24px 60px -30px rgba(9, 30, 66, 0.6);
}

.hero-visual::before {
  animation: none;
  background: linear-gradient(
    120deg,
    transparent 30%,
    rgba(255, 255, 255, 0.05) 50%,
    transparent 70%
  );
}

.hero-stat {
  border-radius: 6px;
}

.hero-stat strong {
  font-family: var(--font-mono);
}

/* ---------- 5) 分区标题：标题下品牌短标线 ---------- */
.section {
  padding: 72px 0;
}

.section-title h2 {
  font-size: 1.6rem;
}

.section-title h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 2px;
  margin: 14px auto 0;
  background: var(--accent);
  opacity: 0.75;
}

/* ---------- 6) Feature 卡片：工程化 ---------- */
.feature {
  background: var(--surface);
  box-shadow: var(--shadow);
}

.feature:hover {
  transform: translateY(-2px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 6px;
  border: 1px solid var(--accent-line);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

/* ---------- 7) 卡片 / 面板：回归纯净表面（去渐变） ---------- */
.product-card,
.panel,
.detail-main,
.detail-sidebar {
  background: var(--surface);
  border-color: var(--border);
}

.product-card:hover {
  border-color: var(--accent-line);
  box-shadow: var(--shadow-md);
}

.product-card::before {
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 0;
  background: var(--accent);
}

.product-card .tag {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.product-card .price,
.detail-sidebar .price {
  font-family: var(--font-mono);
}

/* ---------- 8) 按钮：克制纯色 + 品牌色阴影 ---------- */
.btn-primary {
  background: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 10px 24px -10px rgba(14, 93, 148, 0.5);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent-line);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- 9) 支付页：保留支付宝/微信品牌色，徽标改纯色浅底 ---------- */
.qr-box.pay-alipay .qr-brand {
  background: #f0f7ff;
  color: #1677ff;
  border: 1px solid rgba(22, 119, 255, 0.22);
}

.qr-box.pay-wechat .qr-brand {
  background: #f0fdf6;
  color: #07c160;
  border: 1px solid rgba(7, 193, 96, 0.24);
}

/* ---------- 10) 成功页：去掉三色绿渐变 ---------- */
.success-icon {
  background: var(--success);
  box-shadow: 0 16px 36px -14px rgba(5, 150, 105, 0.55),
    inset 0 0 0 6px rgba(255, 255, 255, 0.14);
}

/* ---------- 11) Footer：纯净深色 + 深色网格（去渐变） ---------- */
.site-footer {
  background-color: #0b1522;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px) 0 0 / 26px 26px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px) 0 0 / 26px 26px;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* ---------- 12) 内容页（关于我们 / 条款 / 隐私）排版 ---------- */
.doc-card {
  max-width: 860px;
  margin: 0 auto;
  padding: 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.doc h1 {
  font-size: 1.7rem;
  text-align: left;
  margin-bottom: 6px;
}

.doc .doc-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.doc h2 {
  font-size: 1.12rem;
  margin-top: 34px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
}

.doc p,
.doc li {
  color: var(--text-secondary);
  line-height: 1.85;
  font-size: 0.94rem;
}

.doc ul {
  padding-left: 20px;
  margin: 0 0 1em;
}

.doc li {
  margin-bottom: 6px;
}

.doc a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 12px 0 20px;
}

.doc th,
.doc td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

.doc th {
  background: var(--bg-alt);
  font-weight: 600;
}

@media (max-width: 640px) {
  .doc-card {
    padding: 24px 20px;
  }
}