/* ===== 设计令牌 ===== */
:root {
  --bg-deep: #0a0e17;
  --bg-card: rgba(15, 23, 42, 0.78);
  --bg-card-hover: rgba(20, 30, 52, 0.92);
  --bg-input: rgba(30, 41, 59, 0.6);
  --border: rgba(148, 163, 184, 0.12);
  --border-focus: rgba(56, 189, 248, 0.45);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --accent-3: #22d3ee;
  --accent-glow: rgba(56, 189, 248, 0.25);
  --success: #34d399;
  --warning: #fbbf24;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 16px 32px rgba(0, 0, 0, 0.3);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
  --header-h: 60px;
  --max-w: 1140px;
  --transition: 0.25s ease;
  /* 间距令牌 */
  --section-y: 48px;
  --section-header-gap: 28px;
  --grid-gap: 16px;
  --card-pad: 20px;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* ===== 背景 ===== */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(56, 189, 248, 0.16), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(129, 140, 248, 0.14), transparent),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(14, 165, 233, 0.08), transparent);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
}

/* ===== 布局 ===== */
.container {
  width: min(var(--max-w), calc(100% - 40px));
  margin: 0 auto;
}

.section {
  position: relative;
  z-index: 1;
  padding: var(--section-y) 0;
  scroll-margin-top: calc(var(--header-h) + 12px);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--section-header-gap);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(56, 189, 248, 0.25);
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(24px, 3.5vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
  background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-desc {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.65;
}

/* ===== 顶栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-image {
  display: block;
  height: 40px;
  width: auto;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.2;
}

.logo-brand {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.logo--footer .logo-brand {
  font-size: 16px;
}

.logo--footer .logo-name {
  font-size: 13px;
}

.logo-image--footer {
  height: 48px;
}

.nav {
  display: flex;
  gap: 8px;
}

.nav a {
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  transition: var(--transition);
}

.nav a:hover,
.nav a.is-active {
  color: var(--text);
  background: rgba(148, 163, 184, 0.08);
}

.header-actions {
  display: flex;
  gap: 10px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0e17;
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(56, 189, 248, 0.35);
}

.btn-ghost {
  background: rgba(148, 163, 184, 0.08);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: rgba(148, 163, 184, 0.14);
  border-color: rgba(148, 163, 184, 0.25);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  z-index: 1;
  padding: 40px 0 36px;
  scroll-margin-top: var(--header-h);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 320px);
  gap: 28px;
  align-items: center;
}

.hero-main {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid rgba(52, 211, 153, 0.3);
  background: rgba(52, 211, 153, 0.08);
  color: var(--success);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 12px var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: clamp(30px, 4.2vw, 44px);
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.hero-title .gradient {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  max-width: 560px;
  margin: 0 0 20px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

.hero-desc strong {
  color: var(--text);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.stat-card {
  padding: 14px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  transition: var(--transition);
}

.stat-card:hover {
  border-color: rgba(56, 189, 248, 0.25);
}

.stat-value {
  font-size: 20px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 2px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-dim);
}

/* ===== Hero 联系卡片 ===== */
.hero-contact {
  position: relative;
}

.contact-card {
  padding: 18px 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(7, 193, 96, 0.22);
  background:
    linear-gradient(160deg, rgba(7, 193, 96, 0.06) 0%, transparent 45%),
    var(--bg-card);
  backdrop-filter: blur(12px);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.03) inset,
    0 16px 32px rgba(0, 0, 0, 0.24),
    0 0 40px rgba(7, 193, 96, 0.05);
}

.contact-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.contact-avatar {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(7, 193, 96, 0.12);
  border: 1px solid rgba(7, 193, 96, 0.25);
  flex-shrink: 0;
}

.contact-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 2px;
}

.contact-subtitle {
  font-size: 12px;
  color: var(--text-dim);
}

.contact-qr-wrap {
  text-align: center;
  margin-bottom: 14px;
}

.contact-qr-frame {
  display: inline-block;
  padding: 8px;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
  margin-bottom: 8px;
}

.contact-qr-frame img {
  display: block;
  width: 148px;
  height: 148px;
  border-radius: 6px;
}

.contact-qr-tip {
  font-size: 12px;
  color: var(--text-muted);
}

.contact-wechat-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.22);
}

.contact-wechat-label {
  font-size: 13px;
  color: var(--text-dim);
  flex-shrink: 0;
}

.contact-wechat-id {
  flex: 1;
  min-width: 0;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: #07C160;
  background: none;
  border: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-copy {
  flex-shrink: 0;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy:hover {
  background: rgba(56, 189, 248, 0.18);
}

.btn-copy.is-copied {
  border-color: rgba(52, 211, 153, 0.4);
  background: rgba(52, 211, 153, 0.12);
  color: var(--success);
}

.contact-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.contact-meta li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
}

.contact-meta-icon {
  font-size: 14px;
  flex-shrink: 0;
}

.btn-wechat {
  width: 100%;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #07C160, #06ae56);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  box-shadow: 0 6px 18px rgba(7, 193, 96, 0.22);
  transition: var(--transition);
}

.btn-wechat:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(7, 193, 96, 0.35);
}

/* ===== 功能卡片 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.feature-card {
  padding: var(--card-pad);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: rgba(56, 189, 248, 0.3);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-size: 20px;
  margin-bottom: 12px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card:nth-child(2) .feature-icon {
  background: rgba(129, 140, 248, 0.1);
  border-color: rgba(129, 140, 248, 0.2);
}

.feature-card:nth-child(3) .feature-icon {
  background: rgba(52, 211, 153, 0.1);
  border-color: rgba(52, 211, 153, 0.2);
}

.feature-card:nth-child(4) .feature-icon {
  background: rgba(251, 191, 36, 0.1);
  border-color: rgba(251, 191, 36, 0.2);
}

.feature-card:nth-child(5) .feature-icon {
  background: rgba(34, 211, 238, 0.1);
  border-color: rgba(34, 211, 238, 0.2);
}

.feature-card:nth-child(6) .feature-icon {
  background: rgba(244, 114, 182, 0.1);
  border-color: rgba(244, 114, 182, 0.2);
}

.feature-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 三种模式 ===== */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.mode-card {
  position: relative;
  padding: var(--card-pad);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: var(--transition);
  overflow: hidden;
}

.mode-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: var(--transition);
}

.mode-card:hover::before,
.mode-card.is-featured::before {
  opacity: 1;
}

.mode-card.is-featured {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 0 40px rgba(56, 189, 248, 0.1);
}

.mode-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 10px;
}

.mode-tag.basic {
  background: rgba(251, 191, 36, 0.12);
  color: var(--warning);
}

.mode-tag.standard {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
}

.mode-tag.channel {
  background: rgba(129, 140, 248, 0.12);
  color: var(--accent-2);
}

.mode-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.mode-sub {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.mode-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.6;
}

.mode-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.mode-list li::before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

.mode-speed {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mode-speed-label {
  font-size: 13px;
  color: var(--text-dim);
}

.mode-speed-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}

/* ===== 流程 ===== */
.flow-section {
  background: rgba(15, 23, 42, 0.4);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.flow-diagram {
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 8px;
}

.flow-step {
  flex: 1;
  min-width: 160px;
  text-align: center;
  position: relative;
  padding: 0 12px;
}

.flow-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -8px;
  top: 22px;
  color: var(--accent);
  font-size: 18px;
  font-weight: 700;
}

.flow-num {
  width: 44px;
  height: 44px;
  margin: 0 auto 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(129, 140, 248, 0.15));
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-size: 18px;
}

.flow-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
}

.flow-desc {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

.flow-code {
  margin-top: 24px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.35);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-3);
  overflow-x: auto;
  text-align: center;
  line-height: 1.5;
}

.flow-code span {
  color: var(--text-muted);
}

/* ===== 安全 ===== */
.security-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.security-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.security-item {
  display: flex;
  gap: 12px;
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.security-item-icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(52, 211, 153, 0.1);
  font-size: 18px;
}

.security-item-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
}

.security-item-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.55;
}

.security-visual {
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.security-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

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

.security-table th {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.security-table td:first-child {
  color: var(--text-muted);
}

.security-table td:last-child {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
}

/* ===== 平台 + FAQ 并排 ===== */
.platform-faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.section-header--left {
  text-align: left;
  max-width: none;
  margin-bottom: 20px;
}

.platform-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-card--compact {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
}

.feature-card--compact .feature-icon {
  width: 40px;
  height: 40px;
  font-size: 18px;
  margin-bottom: 0;
  flex-shrink: 0;
}

.feature-card--compact .feature-body {
  min-width: 0;
}

.feature-card--compact .feature-title {
  margin-bottom: 4px;
}

.feature-card--compact .feature-desc {
  font-size: 12px;
  line-height: 1.55;
}

.platform-col .faq-list,
.faq-col .faq-list {
  max-width: none;
  margin: 0;
}

.faq-col .faq-question {
  font-size: 13px;
  padding: 12px 14px;
}

.faq-col .faq-answer-inner {
  padding: 0 14px 12px;
  font-size: 12px;
}

.faq-item.is-open .faq-answer {
  max-height: 360px;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  background: rgba(148, 163, 184, 0.05);
}

.faq-icon {
  font-size: 20px;
  color: var(--accent);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-item.is-open .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 18px 14px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===== CTA ===== */
.cta-section {
  padding: var(--section-y) 0;
}

.cta-card {
  text-align: center;
  padding: 36px 28px;
  border-radius: var(--radius);
  border: 1px solid rgba(56, 189, 248, 0.25);
  background:
    linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(129, 140, 248, 0.08)),
    var(--bg-card);
  box-shadow: 0 0 48px rgba(56, 189, 248, 0.06);
}

.cta-title {
  font-size: clamp(22px, 3.5vw, 28px);
  font-weight: 800;
  margin-bottom: 10px;
}

.cta-desc {
  max-width: 520px;
  margin: 0 auto 20px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* ===== 页脚 ===== */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 32px 0 24px;
  background: rgba(10, 14, 23, 0.6);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 24px;
}

.footer-brand p {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-dim);
  max-width: 300px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
  transition: var(--transition);
}

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

.footer-bottom {
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
}

/* ===== 移动端菜单 ===== */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(148, 163, 184, 0.08);
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
}

.mobile-nav {
  display: none;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-main {
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-contact {
    max-width: 340px;
    margin: 0 auto;
  }

  .features-grid,
  .modes-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .platform-faq-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav,
  .header-actions .btn-ghost {
    display: none;
  }

  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .mobile-nav.is-open {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    padding: 16px;
    background: rgba(10, 14, 23, 0.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
  }

  .mobile-nav a {
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 15px;
  }

  .features-grid,
  .modes-grid {
    grid-template-columns: 1fr;
  }

  .flow-step:not(:last-child)::after {
    display: none;
  }

  .flow-diagram {
    flex-direction: column;
    gap: 16px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 36px 0;
  }

  .hero {
    padding: 32px 0 28px;
  }
}