/* ============================================
   快连官网 v2 - 主样式表
   ============================================ */

:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text2: #475569;
  --text3: #94a3b8;
  --border: #e2e8f0;
  --prim1: #7c3aed;
  --prim2: #a855f7;
  --pink: #ec4899;
  --amber: #f59e0b;
  --green: #10b981;
  --grad: linear-gradient(135deg, #7c3aed, #ec4899);
  --grad2: linear-gradient(135deg, #a855f7, #f472b6);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --max-w: 1200px;
  --h: 72px;
  --ff: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--ff);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--prim1); text-decoration: none; transition: color 0.25s; }
a:hover { color: var(--pink); }
ul { list-style: none; }

.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.938rem;
  font-weight: 600;
  font-family: var(--ff);
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
  line-height: 1.4;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.25);
}
.btn-primary:hover {
  background: var(--grad2);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(124, 58, 237, 0.35);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover {
  background: var(--surface);
  border-color: var(--prim1);
  color: var(--prim1);
}
.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}
.btn-sm {
  padding: 8px 18px;
  font-size: 0.813rem;
}

/* ===== Top Bar ===== */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.topbar-inner {
  display: flex;
  flex-direction: column;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.topbar-row1 {
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--h);
  position: relative;
}
.site-logo {
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}
.site-logo:hover { color: var(--text); }
.logo-mark {
  width: 34px;
  height: 34px;
  background: var(--grad);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
  font-weight: 800;
}
.topbar-action {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}
.topbar-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  height: 44px;
  border-top: 1px solid var(--border);
}
.topbar-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text2);
  position: relative;
  padding: 0 2px;
}
.topbar-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad);
  transition: width 0.25s;
  border-radius: 1px;
}
.topbar-nav a:hover, .topbar-nav a.here {
  color: var(--text);
}
.topbar-nav a:hover::after, .topbar-nav a.here::after {
  width: 100%;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
  transition: all 0.25s;
}

/* ===== Hero v2 ===== */
.showcase {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}
.showcase .wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.showcase-text { padding-right: 20px; }
.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: rgba(124, 58, 237, 0.08);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--prim1);
  margin-bottom: 20px;
}
.showcase-badge i {
  width: 5px;
  height: 5px;
  background: var(--green);
  border-radius: 50%;
  display: inline-block;
}
.showcase-text h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.showcase-text h1 span {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.showcase-text p {
  font-size: 1.1rem;
  color: var(--text2);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 480px;
}
.showcase-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.showcase-visual {
  background: linear-gradient(135deg, rgba(124,58,237,0.05), rgba(236,72,153,0.05));
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(124,58,237,0.1);
  position: relative;
  overflow: hidden;
}
.showcase-visual-inner {
  text-align: center;
  color: var(--text3);
  font-size: 0.9rem;
}
.showcase-visual-inner .big-icon {
  font-size: 4rem;
  margin-bottom: 12px;
  display: block;
}

/* ===== Quick Stats ===== */
.quickstats {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.quickstats .wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.quickstats-item {
  padding: 32px 24px;
  text-align: center;
  border-right: 1px solid var(--border);
}
.quickstats-item:last-child { border-right: none; }
.quickstats-num {
  font-size: 2rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.quickstats-label {
  font-size: 0.85rem;
  color: var(--text3);
  margin-top: 4px;
}

/* ===== Section Common ===== */
.sec { padding: 80px 0; }
.sec-alt { background: var(--surface); }
.sec-hd {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}
.sec-hd em {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(124, 58, 237, 0.08);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--prim1);
  font-style: normal;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.sec-hd h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.sec-hd p {
  color: var(--text2);
  font-size: 1rem;
  line-height: 1.7;
}

/* ===== Benefits (2-col alternating) ===== */
.benefits-wall { display: flex; flex-direction: column; gap: 32px; }
.benefit-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  transition: box-shadow 0.3s;
}
.benefit-block:hover {
  box-shadow: var(--shadow-hover);
}
.benefit-block.reverse {
  direction: rtl;
}
.benefit-block.reverse > * {
  direction: ltr;
}
.benefit-visual {
  background: linear-gradient(135deg, rgba(124,58,237,0.04), rgba(236,72,153,0.04));
  border-radius: var(--radius-sm);
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(124,58,237,0.08);
  font-size: 0.85rem;
  color: var(--text3);
}
.benefit-text h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.benefit-text p {
  color: var(--text2);
  font-size: 0.938rem;
  line-height: 1.7;
}
.benefit-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(124, 58, 237, 0.08);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--prim1);
  margin-bottom: 10px;
}

/* ===== Steps v2 ===== */
.steps-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.step-slot {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: box-shadow 0.3s;
}
.step-slot:hover {
  box-shadow: var(--shadow-hover);
}
.step-marker {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  margin: 0 auto 14px;
}
.step-slot h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.step-slot p {
  font-size: 0.85rem;
  color: var(--text2);
  line-height: 1.5;
}

/* ===== Pricing v2 ===== */
.tier-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}
.tier-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all 0.3s;
  position: relative;
}
.tier-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.tier-card.popular {
  border-color: var(--prim1);
  background: linear-gradient(180deg, rgba(124,58,237,0.03), var(--surface));
}
.tier-card.popular::before {
  content: '推荐';
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  padding: 3px 18px;
  background: var(--grad);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
}
.tier-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.tier-type {
  font-size: 0.8rem;
  color: var(--text3);
  margin-bottom: 16px;
}
.tier-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 2px;
}
.tier-price small {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text3);
}
.tier-saving {
  font-size: 0.8rem;
  color: var(--green);
  font-weight: 500;
  margin-bottom: 20px;
}
.tier-features {
  margin: 16px 0;
}
.tier-features li {
  padding: 7px 0;
  font-size: 0.875rem;
  color: var(--text2);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
.tier-features li:last-child { border-bottom: none; }
.tier-features li::before {
  content: '✓';
  color: var(--green);
  font-weight: 700;
}
.tier-card .btn {
  width: 100%;
  margin-top: 8px;
}

/* ===== Testimonials v2 ===== */
.talk-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.talk-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.talk-stars {
  color: var(--amber);
  font-size: 0.85rem;
  margin-bottom: 10px;
}
.talk-text {
  color: var(--text2);
  font-size: 0.9rem;
  line-height: 1.65;
  font-style: italic;
  margin-bottom: 16px;
}
.talk-author {
  display: flex;
  align-items: center;
  gap: 10px;
}
.talk-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
}
.talk-name { font-weight: 600; font-size: 0.85rem; }
.talk-source { font-size: 0.78rem; color: var(--text3); }

/* ===== CTA Banner ===== */
.cta-banner {
  padding: 72px 0;
  background: linear-gradient(135deg, rgba(124,58,237,0.06), rgba(236,72,153,0.04));
  text-align: center;
}
.cta-banner h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.cta-banner p {
  color: var(--text2);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

/* ===== Q&A ===== */
.qna-list {
  max-width: 720px;
  margin: 0 auto;
}
.qna-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
}
.qna-q {
  width: 100%;
  padding: 16px 20px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  font-family: var(--ff);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.qna-q::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--text3);
  transition: transform 0.25s;
}
.qna-item.open .qna-q::after {
  content: '−';
}
.qna-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.qna-a-inner {
  padding: 0 20px 18px;
  color: var(--text2);
  font-size: 0.9rem;
  line-height: 1.65;
}
.qna-item.open .qna-a {
  max-height: 300px;
}

/* ===== Story ===== */
.story-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.story-text h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.story-text p {
  color: var(--text2);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 12px;
}
.story-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.story-metric {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
}
.story-metric-num {
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.story-metric-label {
  font-size: 0.82rem;
  color: var(--text3);
  margin-top: 3px;
}

/* ===== Page Top ===== */
.page-top {
  padding: 100px 0 40px;
  text-align: center;
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}
.page-top h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.page-top p {
  color: var(--text2);
  font-size: 1.05rem;
  max-width: 540px;
  margin: 0 auto;
}

/* ===== Platforms ===== */
.platform-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.platform-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all 0.3s;
}
.platform-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--prim1);
}
.platform-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.platform-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.platform-card p {
  font-size: 0.8rem;
  color: var(--text3);
  margin-bottom: 14px;
}
.platform-card .btn { width: 100%; }

/* ===== Footer v2 ===== */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 48px 0 28px;
}
.footer .wrap {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.footer-brand .site-logo {
  color: #f8fafc;
  justify-content: flex-start;
  margin-bottom: 10px;
}
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.6;
  max-width: 280px;
}
.footer h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #64748b;
  margin-bottom: 14px;
}
.footer-links li { margin-bottom: 8px; }
.footer-links a {
  font-size: 0.85rem;
  color: #94a3b8;
}
.footer-links a:hover { color: #f8fafc; }
.footer-soc {
  display: flex;
  gap: 12px;
  margin-top: 14px;
}
.footer-soc a {
  color: #64748b;
  font-size: 0.8rem;
  padding: 6px 14px;
  border: 1px solid #1e293b;
  border-radius: var(--radius-sm);
  transition: all 0.25s;
}
.footer-soc a:hover {
  color: #f8fafc;
  border-color: var(--prim1);
}
.footer-bot {
  padding-top: 20px;
  border-top: 1px solid #1e293b;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8rem;
}

/* ===== 404 ===== */
.page-gone {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 60px;
}
.page-gone h1 {
  font-size: 5rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}
.page-gone h2 {
  font-size: 1.3rem;
  margin-bottom: 10px;
}
.page-gone p {
  color: var(--text2);
  margin-bottom: 24px;
}

/* ===== Animations ===== */
.fadeUp {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fadeUp.show {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .showcase .wrap {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .showcase-text { padding-right: 0; }
  .benefit-block { grid-template-columns: 1fr; gap: 24px; }
  .steps-row { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .topbar-nav {
    display: none;
    position: absolute;
    top: var(--h);
    left: 0;
    right: 0;
    background: var(--surface);
    flex-direction: column;
    height: auto;
    padding: 16px 24px;
    gap: 14px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    z-index: 99;
  }
  .topbar-nav.open { display: flex; }
  .mobile-toggle { display: block; }
  .topbar-action { display: none; }

  .quickstats .wrap { grid-template-columns: repeat(2, 1fr); }
  .quickstats-item:nth-child(2) { border-right: none; }
  .quickstats-item:nth-child(1),
  .quickstats-item:nth-child(2) { border-bottom: 1px solid var(--border); }

  .sec-hd h2 { font-size: 1.5rem; }
  .showcase-text h1 { font-size: 2.2rem; }
  .tier-grid { grid-template-columns: 1fr; max-width: 400px; }
  .talk-grid { grid-template-columns: 1fr; }
  .platform-wall { grid-template-columns: 1fr; max-width: 360px; margin: 0 auto; }
  .steps-row { grid-template-columns: 1fr; }
  .story-split { grid-template-columns: 1fr; }

  .footer .wrap {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .page-top h1 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .showcase-text h1 { font-size: 1.7rem; }
  .sec { padding: 48px 0; }
  .quickstats-item { padding: 20px 16px; }
  .benefit-block { padding: 24px; }
}