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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", PingFang SC, "Helvetica Neue", Arial, sans-serif;
  color: #e5f0ff;
  background: radial-gradient(circle at top, #0b1220 0, #020617 55%, #00010a 100%);
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: 1120px;
  padding: 0 20px;
  margin: 0 auto;
}

.section {
  padding: 88px 0;
}

.section-alt {
  background: rgba(10, 15, 35, 0.85);
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
  color: #f5f6ff;
}

.section-header h2 {
  margin: 0 0 14px;
  font-size: 36px;
  line-height: 1.3;
}

.section-header p {
  margin: 0;
  font-size: 17px;
  color: #b0b6d9;
}

.section-kicker {
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #9ca3c8;
  margin: 0 0 6px;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8, #0ea5e9, #2563eb);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all 0.18s ease-out;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fdfcff;
  box-shadow: 0 14px 40px rgba(37, 99, 235, 0.55);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 55px rgba(79, 70, 229, 0.55);
}

.btn-secondary {
  background: rgba(16, 23, 60, 0.7);
  color: #e5e7ff;
  border-color: rgba(99, 102, 241, 0.4);
}

.btn-secondary:hover {
  background: rgba(16, 23, 60, 0.95);
}

.btn-outline {
  background: rgba(7, 12, 32, 0.9);
  border-color: rgba(148, 163, 184, 0.6);
  color: #e5e7eb;
}

.btn-outline:hover {
  border-color: #38bdf8;
  color: #fdfcff;
}

.btn-full {
  width: 100%;
}

.modal-overlay[hidden],
.modal[hidden] {
  display: none;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.72);
  backdrop-filter: blur(10px);
  z-index: 80;
  opacity: 0;
  transition: opacity 0.18s ease-out;
}

.modal-overlay.is-open {
  opacity: 1;
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 90;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.18s ease-out, transform 0.18s ease-out;
}

.modal.is-open {
  opacity: 1;
  transform: translateY(0);
}

.modal-card {
  width: min(520px, 100%);
  border-radius: 18px;
  padding: 16px 16px 14px;
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.25), transparent 55%),
    rgba(10, 16, 40, 0.98);
  border: 1px solid rgba(96, 165, 250, 0.65);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.6);
  color: #e5e7ff;
}

.modal-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.modal-icon {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.75));
  border: 1px solid rgba(129, 140, 248, 0.85);
  box-shadow: 0 14px 40px rgba(37, 99, 235, 0.6);
  filter: drop-shadow(0 0 14px rgba(56, 189, 248, 0.5));
}

.modal-title {
  margin: 0;
  font-size: 18px;
  line-height: 1.2;
}

.modal-desc {
  margin: 2px 0 0;
  font-size: 15px;
  color: #b0b6d9;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.12s ease-out, border-color 0.12s ease-out;
}

.modal-close:hover {
  transform: translateY(-1px);
  border-color: rgba(96, 165, 250, 0.95);
}

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

@media (prefers-reduced-motion: reduce) {
  .modal,
  .modal-overlay,
  .tag-icon {
    transition: none !important;
    animation: none !important;
  }
}

.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: radial-gradient(circle at top left, rgba(96, 165, 250, 0.12), transparent 55%),
    rgba(5, 8, 22, 0.88);
  border-bottom: 1px solid rgba(75, 85, 99, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

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

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 12px;
  background: conic-gradient(from 180deg, #0ea5e9, #2563eb, #38bdf8, #1d4ed8, #0ea5e9);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #fdfcff;
  box-shadow: 0 10px 30px rgba(79, 70, 229, 0.72);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 17px;
  font-weight: 600;
  color: #f9fafb;
}

.logo-subtitle {
  font-size: 14px;
  color: #9ca3af;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 15px;
  color: #d1d5db;
}

.site-nav a {
  padding: 6px 0;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #4f46e5, #a855f7);
  transition: width 0.16s ease-out;
}

.site-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(129, 140, 248, 0.8);
}

.nav-cta:hover {
  background: rgba(79, 70, 229, 0.95);
  color: #f9fafb;
}

.nav-toggle {
  display: none;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.9);
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: #e5e7eb;
  border-radius: 999px;
  transition: transform 0.16s ease-out, opacity 0.16s ease-out;
}

.nav-toggle span + span {
  margin-top: 3px;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* Hero */

.hero {
  padding-top: 80px;
  padding-bottom: 80px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

.hero-content {
  color: #e5e7ff;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(129, 140, 248, 0.7);
  background: rgba(15, 23, 42, 0.88);
  font-size: 14px;
  color: #c7d2fe;
  margin-bottom: 14px;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: 40px;
  line-height: 1.3;
}

.hero-subtitle {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: #9ca3c8;
}

.hero-downloads {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 18px;
  align-items: flex-start;
}

.download-title {
  margin: 0 0 4px;
  font-size: 20px;
  color: #e5e7ff;
}

.download-subtitle {
  margin: 0 0 10px;
  font-size: 15px;
  color: #9ca3c8;
}

.hero-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-subtext {
  margin-left: 8px;
  font-size: 13px;
  color: #cbd5f5;
}

.hero-note {
  margin-top: 8px;
  font-size: 16px;
  color: #fff;
}

.download-card {
  border-radius: 16px;
  padding: 14px 14px 12px;
  background: radial-gradient(circle at top left, rgba(96, 165, 250, 0.22), transparent 60%),
    rgba(10, 16, 40, 0.98);
  border: 1px solid rgba(129, 140, 248, 0.7);
  color: #e5e7ff;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.85);
}

.download-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.download-card-title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 500;
}

.download-card-desc {
  margin: 0 0 10px;
  font-size: 14px;
  color: #c7d2fe;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 14px;
}

.badge-outline {
  border: 1px solid rgba(165, 180, 252, 0.85);
  color: #e5e7ff;
  background: rgba(15, 23, 42, 0.9);
}

.hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 26px;
}

.metric-item {
  padding-right: 14px;
  border-right: 1px solid rgba(55, 65, 81, 0.6);
}

.metric-item:last-child {
  border-right: none;
}

.metric-value {
  font-size: 24px;
  font-weight: 600;
  color: #e5e7ff;
}

.metric-label {
  font-size: 13px;
  color: #9ca3c8;
}

.hero-visual {
  position: relative;
}

.hero-card {
  border-radius: 24px;
  padding: 18px 18px 14px;
  background: radial-gradient(circle at top left, rgba(96, 165, 250, 0.18), transparent 60%),
    radial-gradient(circle at bottom right, rgba(37, 99, 235, 0.22), transparent 60%),
    rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.55);
  box-shadow: 0 22px 60px rgba(15, 23, 42, 0.9);
  color: #f9fafb;
}

.hero-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 11px;
}

.pill-green {
  background: rgba(56, 189, 248, 0.16);
  color: #38bdf8;
}

.pill-dark {
  background: rgba(15, 23, 42, 0.75);
  color: #e5e7eb;
}

.hero-dialog {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 16px;
  padding: 10px;
  border: 1px solid rgba(75, 85, 99, 0.65);
}

.dialog-bubble {
  border-radius: 14px;
  padding: 8px 10px;
  margin-bottom: 6px;
  font-size: 14px;
}

.dialog-bubble.user {
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(156, 163, 175, 0.7);
}

.dialog-bubble.ai {
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.22), transparent 65%),
    rgba(17, 24, 39, 0.98);
  border: 1px solid rgba(129, 140, 248, 0.95);
}

.dialog-label {
  display: inline-block;
  font-size: 14px;
  color: #9ca3af;
  margin-bottom: 2px;
}

.dialog-bubble p {
  margin: 0;
  color: #e5e7eb;
}

.hero-card-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  font-size: 13px;
  color: #9ca3af;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
}

.dot-online {
  background: #38bdf8;
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.35);
}

.dot-auto {
  background: #6366f1;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

.hero-side-cards {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.mini-card {
  border-radius: 14px;
  padding: 10px 12px;
  font-size: 14px;
  color: #e5e7eb;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(55, 65, 81, 0.8);
}

.mini-label {
  display: inline-block;
  margin-bottom: 4px;
  font-size: 14px;
  color: #a5b4fc;
}

/* Features */

.feature-card {
  border-radius: 18px;
  padding: 18px 18px 16px;
  background: radial-gradient(circle at top left, rgba(129, 140, 248, 0.2), transparent 60%),
    rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: #e5e7eb;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.78);
}

.feature-icon {
  width: 30px;
  height: 30px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.9);
  margin-bottom: 10px;
  font-size: 16px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.feature-card p {
  margin: 0 0 10px;
  font-size: 15px;
  color: #9ca3c8;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
  color: #d1d5db;
}

.feature-list li + li {
  margin-top: 4px;
}

.feature-list li::before {
  content: "•";
  color: #60a5fa;
  margin-right: 6px;
}

/* Scenarios */

.scenario-card {
  border-radius: 18px;
  padding: 18px 18px 16px;
  background: rgba(15, 23, 42, 0.94);
  border: 1px solid rgba(55, 65, 81, 0.9);
  color: #e5e7eb;
}

.scenario-tag {
  display: inline-flex;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.18);
  color: #7dd3fc;
  font-size: 12px;
  margin-bottom: 8px;
}

.scenario-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.scenario-card p {
  margin: 0 0 10px;
  font-size: 15px;
  color: #9ca3c8;
}

.scenario-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
  color: #d1d5db;
}

.scenario-card li + li {
  margin-top: 4px;
}

.scenario-card li::before {
  content: "▹";
  color: #38bdf8;
  margin-right: 6px;
}

/* Workflow */

.workflow {
  display: grid;
  gap: 20px;
}

.workflow-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(75, 85, 99, 0.8);
  color: #e5e7eb;
}

.workflow-index {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: linear-gradient(135deg, #0ea5e9, #2563eb);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: #f9fafb;
  margin-top: 4px;
}

.workflow-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.workflow-body p {
  margin: 0 0 8px;
  font-size: 15px;
  color: #9ca3c8;
}

.workflow-body ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
  color: #d1d5db;
}

.workflow-body li + li {
  margin-top: 4px;
}

.workflow-body li::before {
  content: "✓";
  color: #22c55e;
  margin-right: 6px;
}

/* Pricing */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.pricing-card {
  border-radius: 18px;
  padding: 18px 18px 16px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(55, 65, 81, 0.9);
  color: #e5e7eb;
  position: relative;
}

.pricing-card-highlight {
  border-color: rgba(129, 140, 248, 0.95);
  box-shadow: 0 22px 70px rgba(79, 70, 229, 0.82);
  transform: translateY(-4px);
}

.pricing-badge {
  position: absolute;
  top: 12px;
  right: 14px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  background: linear-gradient(135deg, #f97316, #ec4899);
  color: #fdfcff;
}

.pricing-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.pricing-price {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 600;
  color: #c4b5fd;
}

.pricing-desc {
  margin: 0 0 10px;
  font-size: 15px;
  color: #9ca3c8;
}

.pricing-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  font-size: 14px;
  color: #d1d5db;
}

.pricing-card li + li {
  margin-top: 4px;
}

.pricing-card li::before {
  content: "•";
  color: #60a5fa;
  margin-right: 6px;
}

/* FAQ */

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}

.faq-item {
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.94);
  border: 1px solid rgba(55, 65, 81, 0.9);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 10px 14px;
  border: none;
  outline: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  color: #e5e7eb;
  font-size: 16px;
}

.faq-icon {
  font-size: 16px;
  color: #9ca3c8;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 14px;
  transition: max-height 0.2s ease-out, padding-bottom 0.2s ease-out;
}

.faq-answer p {
  margin: 8px 0 12px;
  font-size: 15px;
  color: #9ca3c8;
}

.faq-item.is-open .faq-answer {
  max-height: 400px;
  padding-bottom: 8px;
}

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

/* Mobile Collaboration */

.mobile-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

.mobile-copy h3 {
  margin: 0 0 8px;
  font-size: 20px;
  color: #e5e7ff;
}

.mobile-copy p {
  margin: 0 0 12px;
  font-size: 16px;
  color: #b0b6d9;
}

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  font-size: 13px;
  color: #e5e7ff;
  background: rgba(15, 23, 42, 0.9);
}

.mobile-visual {
  display: flex;
  justify-content: flex-end;
}

.mobile-chat {
  width: 100%;
  max-width: 320px;
  border-radius: 22px;
  padding: 12px 12px 10px;
  background: radial-gradient(circle at top left, rgba(96, 165, 250, 0.26), transparent 60%),
    rgba(5, 10, 30, 0.98);
  border: 1px solid rgba(148, 163, 184, 0.8);
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.95);
  color: #e5e7eb;
}

.mobile-chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #22c55e;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.3);
}

.mobile-chat-body {
  border-radius: 14px;
  padding: 8px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(55, 65, 81, 0.9);
  max-height: 220px;
  overflow: hidden;
}

.msg {
  margin-bottom: 6px;
  padding: 7px 8px;
  border-radius: 12px;
  font-size: 14px;
}

.msg-user {
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(156, 163, 175, 0.7);
}

.msg-ai {
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.2), transparent 65%),
    rgba(17, 24, 39, 0.98);
  border: 1px solid rgba(129, 140, 248, 0.9);
}

.msg-time {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: #9ca3af;
}

.mobile-chat-input {
  margin-top: 8px;
  border-radius: 999px;
  padding: 7px 10px;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(55, 65, 81, 0.9);
}

.mobile-chat-input .placeholder {
  font-size: 13px;
  color: #6b7280;
}

/* Tag cloud / scenes */

.tag-cloud {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

/* 隐藏横向滚动条（配合移动端自动滚动） */
.tag-cloud {
  -ms-overflow-style: none; /* IE/Edge */
  scrollbar-width: none; /* Firefox */
}

.tag-cloud::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.tag-column {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 12px;
  border-radius: 18px;
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.28), transparent 60%),
    rgba(10, 16, 40, 0.96);
  border: 1px solid rgba(30, 64, 175, 0.8);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.85);
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease-out, box-shadow 0.18s ease-out, border-color 0.18s ease-out;
}

.tag-column::after {
  content: "";
  position: absolute;
  inset: -30%;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.18), transparent 60%);
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.25s ease-out, transform 0.25s ease-out;
}

.tag-column:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 55px rgba(37, 99, 235, 0.65);
  border-color: rgba(96, 165, 250, 0.9);
}

.tag-column:hover::after {
  opacity: 1;
  transform: translateY(0);
}

.tag-column-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.tag-icon {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.7));
  border: 1px solid rgba(129, 140, 248, 0.8);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.85);
  font-size: 18px;
  filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.65));
  animation: floatIcon 3.2s ease-in-out infinite;
}

.tag-column:nth-child(2) .tag-icon {
  animation-delay: 0.4s;
}

.tag-column:nth-child(3) .tag-icon {
  animation-delay: 0.8s;
}

.tag-column:nth-child(4) .tag-icon {
  animation-delay: 1.2s;
}

.tag-column:nth-child(5) .tag-icon {
  animation-delay: 1.6s;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  font-size: 13px;
  color: #e5e7ff;
  background: rgba(15, 23, 42, 0.9);
  transition: transform 0.14s ease-out, box-shadow 0.14s ease-out, border-color 0.14s ease-out,
    background 0.14s ease-out;
}

.tag-pill:hover {
  transform: translateY(-2px);
  border-color: rgba(96, 165, 250, 0.95);
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.28), rgba(15, 23, 42, 0.98));
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.9);
}

.tag-pill-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: transform 0.18s ease-out, filter 0.18s ease-out;
}

.tag-pill-label {
  white-space: nowrap;
}

.tag-pill:hover .tag-pill-icon {
  transform: translateY(-1px) scale(1.06);
  filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.8));
}

@keyframes floatIcon {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
  100% {
    transform: translateY(0);
  }
}

/* Performance */

.perf-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.perf-card {
  border-radius: 18px;
  padding: 18px 18px 14px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(75, 85, 99, 0.9);
  color: #e5e7eb;
}

.perf-kicker {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #9ca3c8;
}

.perf-card h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.perf-card p {
  margin: 0;
  font-size: 14px;
  color: #b0b6d9;
}

/* Footer */

.site-footer {
  border-top: 1px solid rgba(31, 41, 55, 0.9);
  margin-top: 24px;
  background: radial-gradient(circle at top left, rgba(79, 70, 229, 0.18), transparent 50%),
    rgba(5, 8, 22, 0.98);
  color: #9ca3af;
  font-size: 12px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 18px 0;
}

.footer-logo .logo-mark {
  box-shadow: 0 12px 35px rgba(129, 140, 248, 0.9);
}

.footer-note {
  margin: 10px 0 0;
  max-width: 380px;
  font-size: 14px;
}

.footer-right {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: flex-start;
}

.footer-right a {
  color: #9ca3af;
  font-size: 14px;
}

.footer-right a:hover {
  color: #e5e7eb;
}

.footer-bottom {
  border-top: 1px solid rgba(31, 41, 55, 0.9);
  padding: 8px 0 14px;
  text-align: center;
  font-size: 14px !important;

}

/* Responsive */

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1.1fr);
  }

  .hero-visual {
    order: 1;
  }

  .pricing-grid,
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mobile-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .mobile-visual {
    justify-content: flex-start;
  }

  .perf-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 10px 0;
  }

  .site-nav {
    position: fixed;
    inset: 58px 16px auto;
    border-radius: 16px;
    border: 1px solid rgba(55, 65, 81, 0.9);
    background: rgba(10, 15, 35, 0.98);
    padding: 10px 14px 12px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    transform-origin: top;
    transform: scaleY(0.8);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease-out, transform 0.15s ease-out;
  }

  .site-nav a {
    width: 100%;
  }

  .site-nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: scaleY(1);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .section {
    padding: 64px 0;
  }

  .hero {
    padding-top: 64px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-metrics {
    gap: 12px;
  }

  .metric-item {
    padding-right: 10px;
  }

  .grid-3,
  .pricing-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .pricing-card-highlight {
    transform: none;
  }

  .hero-downloads {
    grid-template-columns: minmax(0, 1fr);
  }

  .tag-cloud {
    display: flex;
    flex-wrap: nowrap;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 6px;
    margin-left: -14px;
    margin-right: -14px;
    padding-inline: 14px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }

  .tag-column {
    flex: 0 0 auto;
    min-width: 78%;
    scroll-snap-align: start;
  }

  .footer-inner {
    padding: 14px 0;
  }

  .footer-left {
    text-align: center;
  }

  .footer-left .footer-logo {
    justify-content: center;
  }

  .footer-note {
    margin-left: auto;
    margin-right: auto;
    display: none;
  }

  .footer-right {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 20px 14px;
  
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .hero-metrics {
    flex-direction: column;
  }

  .metric-item {
    border-right: none;
    border-bottom: 1px solid rgba(31, 41, 55, 0.7);
    padding-bottom: 8px;
  }

  .metric-item:last-child {
    border-bottom: none;
  }

  .mobile-chat {
    max-width: 100%;
  }

  .tag-cloud {
    /* 保持与 768px 相同的横向滚动布局 */
    display: flex;
    flex-wrap: nowrap;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 6px;
    margin-left: -14px;
    margin-right: -14px;
    padding-inline: 14px;
  }

  .tag-column {
    min-width: 82%;
  }
}