/* ==========================================================================
   API易 (APIYI) 国内版首页 - 纯静态样式
   面向中国大陆市场，仅中文，无外部依赖
   ========================================================================== */

:root {
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --indigo-600: #4f46e5;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --gray-950: #030712;
  --radius: 0.5rem;
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--gray-900);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.gradient-text {
  display: block;
  background: linear-gradient(to right, var(--blue-600), var(--indigo-600));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 9999px;
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  font-size: 1rem;
}
.btn-primary { background: var(--gray-900); color: #fff; }
.btn-primary:hover { background: var(--gray-700); }
.btn-secondary { background: #fff; color: var(--gray-900); border-color: var(--gray-300); box-shadow: var(--shadow-md); }
.btn-secondary:hover { background: var(--gray-50); }
.btn-outline { background: #fff; color: var(--blue-600); border-color: var(--blue-600); }
.btn-outline:hover { background: #eff6ff; }
.btn-blue { background: var(--blue-600); color: #fff; }
.btn-blue:hover { background: var(--blue-700); }
.btn-lg { font-size: 1.125rem; padding: 1rem 2rem; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom right, #e0f2fe 28%, #64b5f6 70%, #1565c0);
  opacity: 0.6;
}
.hero-inner { position: relative; padding: 6rem 0 4rem; text-align: center; }
.hero h1 {
  font-size: 3rem;
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.1;
}
.hero .subtitle {
  margin-top: 1.5rem;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.25rem;
  color: var(--gray-700);
}
.hero-badges {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 9999px;
  background: linear-gradient(to right, #eff6ff, #eef2ff);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #1e3a8a;
}
.hero-actions {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}
.hero-note { margin-top: 1rem; font-size: 0.875rem; color: var(--gray-600); max-width: 42rem; margin-left: auto; margin-right: auto; }

@media (min-width: 640px) {
  .hero h1 { font-size: 3.75rem; }
  .hero-inner { padding: 7rem 0 5rem; }
  .hero-actions { flex-direction: row; justify-content: center; }
}
@media (min-width: 768px) {
  .hero h1 { font-size: 4.5rem; }
  .hero-inner { padding: 8rem 0 6rem; }
}

/* ---------- Logo cloud ---------- */
.logo-cloud { margin-top: 4rem; }
.logo-cloud-title { text-align: center; font-size: 0.875rem; font-weight: 500; color: var(--gray-600); margin-bottom: 1.5rem; }
.logo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.logo-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  border-radius: var(--radius);
  transition: all 0.3s;
}
.logo-item:hover { background: rgba(255, 255, 255, 0.5); }
.logo-name { font-size: 1rem; font-weight: 700; color: var(--gray-700); transition: color 0.2s; }
.logo-item:hover .logo-name { color: var(--gray-950); }
.logo-sub { font-size: 0.75rem; color: var(--gray-500); margin-top: 0.125rem; }

@media (min-width: 768px) {
  .logo-grid { grid-template-columns: repeat(6, 1fr); }
}

/* ---------- Section headings ---------- */
.section { padding: 6rem 0; }
.subheading {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blue-600);
}
.heading {
  margin-top: 0.5rem;
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  max-width: 48rem;
  color: var(--gray-950);
}
.heading.center { margin-left: auto; margin-right: auto; }
.section-desc { margin-top: 1rem; font-size: 1.125rem; color: var(--gray-600); max-width: 42rem; }
.text-center { text-align: center; }
.text-center .section-desc { margin-left: auto; margin-right: auto; }

@media (min-width: 640px) { .heading { font-size: 2.5rem; } }

/* gradient backdrop for feature block */
.features-bg { background: linear-gradient(to bottom, #fff 50%, var(--gray-100)); padding: 6rem 0; }

/* ---------- Featured model cards + bento ---------- */
.bento-grid {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 1024px) {
  .bento-grid { grid-template-columns: repeat(6, 1fr); margin-top: 4rem; }
  .col-2 { grid-column: span 2; }
  .col-3 { grid-column: span 3; }
}

.model-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  outline: 1px solid rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}
.model-card:hover { box-shadow: var(--shadow-2xl); transform: translateY(-4px); }
.model-card-body { position: relative; padding: 1.75rem; flex: 1; }
.model-card-emoji {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 3.75rem;
  opacity: 0.2;
  transform: rotate(12deg);
  pointer-events: none;
}
.model-card-cat { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
.model-card h3 { margin-top: 0.5rem; font-size: 1.875rem; font-weight: 900; letter-spacing: -0.025em; color: var(--gray-950); }
.model-card-desc { margin-top: 0.375rem; font-size: 0.75rem; font-weight: 500; color: var(--gray-700); }
.model-card-price { margin-top: 1rem; display: flex; align-items: baseline; gap: 0.375rem; }
.model-card-price .big { font-size: 1.875rem; font-weight: 900; }
.model-card-price .unit { font-size: 0.75rem; font-weight: 600; color: var(--gray-600); }
.model-card-tag {
  margin-top: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  border-radius: 9999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: var(--shadow-md);
  align-self: flex-start;
}
.mc-green { background: linear-gradient(to bottom right, #ecfccb, #ecfdf5, #ecfeff); }
.mc-green .model-card-cat { color: #3f6212; }
.mc-green .big { color: #4d7c0f; }
.mc-green .model-card-tag { background: #d9f99d; color: #365314; }
.mc-blue { background: linear-gradient(to bottom right, #dbeafe, #eef2ff, #f3e8ff); }
.mc-blue .model-card-cat { color: #3730a3; }
.mc-blue .big { color: #4338ca; }
.mc-blue .model-card-tag { background: #c7d2fe; color: #312e81; }
.mc-orange { background: linear-gradient(to bottom right, #cffafe, #eff6ff, #ffedd5); }
.mc-orange .model-card-cat { color: #155e75; }
.mc-orange .big { color: #c2410c; font-size: 1.5rem; }
.mc-orange .model-card-tag { background: #fed7aa; color: #7c2d12; }

.bento {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  background: #fff;
  box-shadow: var(--shadow-md);
  outline: 1px solid var(--gray-200);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}
.bento-eyebrow { font-size: 0.875rem; font-weight: 600; color: var(--blue-600); }
.bento h3 { margin-top: 0.25rem; font-size: 1.25rem; font-weight: 600; color: var(--gray-900); }
.bento p { margin-top: 0.5rem; font-size: 0.875rem; color: var(--gray-600); flex: 1; }
.bento-graphic {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  height: 8rem;
}
.bento-graphic.tall { height: 10rem; }
.bento-graphic .num { font-size: 1.875rem; font-weight: 700; color: var(--gray-900); }
.bento-graphic .num-lg { font-size: 2.25rem; font-weight: 700; color: var(--gray-900); }
.bento-graphic .emoji { font-size: 1.875rem; }
.bento-graphic code { font-size: 0.875rem; color: var(--gray-700); }
.bg-blue-soft { background: linear-gradient(to bottom right, rgba(59,130,246,0.2), rgba(99,102,241,0.2)); }
.bg-green-soft { background: linear-gradient(to bottom right, rgba(34,197,94,0.2), rgba(16,185,129,0.2)); }
.bg-purple-soft { background: linear-gradient(to bottom right, rgba(168,85,247,0.2), rgba(236,72,153,0.2)); }
.bg-bp-soft { background: linear-gradient(to bottom right, rgba(59,130,246,0.2), rgba(168,85,247,0.2)); }
.bg-gb-soft { background: linear-gradient(to bottom right, rgba(34,197,94,0.2), rgba(59,130,246,0.2)); }
.bg-or-soft { background: linear-gradient(to bottom right, rgba(249,115,22,0.2), rgba(239,68,68,0.2)); }
.bg-ip-soft { background: linear-gradient(to bottom right, rgba(99,102,241,0.2), rgba(168,85,247,0.2)); }

/* ---------- Pricing ---------- */
.pricing-section { padding: 8rem 0; background: #fff; }
.pricing-grid {
  margin-top: 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 1024px) { .pricing-grid { grid-template-columns: repeat(3, 1fr); } }
.price-card {
  position: relative;
  border-radius: 1rem;
  padding: 2rem;
  background: #fff;
  box-shadow: var(--shadow-lg);
  outline: 1px solid var(--gray-200);
  transition: all 0.3s;
}
.price-card:hover { box-shadow: var(--shadow-xl); }
.price-card.highlight {
  background: linear-gradient(to bottom right, var(--blue-600), var(--indigo-600));
  color: #fff;
  box-shadow: var(--shadow-2xl);
  outline: 2px solid rgba(59, 130, 246, 0.2);
}
@media (min-width: 1024px) { .price-card.highlight { transform: scale(1.05); } }
.price-badge {
  position: absolute;
  top: -1rem;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 9999px;
  background: linear-gradient(to right, #f97316, #ef4444);
  padding: 0.25rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #fff;
  box-shadow: var(--shadow-lg);
  white-space: nowrap;
}
.price-card h3 { font-size: 1.25rem; font-weight: 600; }
.price-amount { margin-top: 1rem; }
.price-amount .num { font-size: 1.875rem; font-weight: 700; }
.price-amount .sub { margin-left: 0.5rem; font-size: 1.125rem; color: var(--gray-600); }
.price-card.highlight .price-amount .sub { color: #dbeafe; }
.price-features { margin: 1.5rem 0 2rem; display: flex; flex-direction: column; gap: 0.75rem; }
.price-features li { display: flex; align-items: flex-start; font-size: 0.875rem; color: var(--gray-600); }
.price-card.highlight .price-features li { color: #eff6ff; }
.price-features svg { margin-right: 0.5rem; height: 1.25rem; width: 1.25rem; flex-shrink: 0; color: var(--blue-600); }
.price-card.highlight .price-features svg { color: #bfdbfe; }

.info-cards {
  margin-top: 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 56rem;
  margin-left: auto;
  margin-right: auto;
}
@media (min-width: 768px) { .info-cards { grid-template-columns: repeat(2, 1fr); } }
.info-card {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  outline: 1px solid var(--gray-200);
  transition: all 0.3s;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}
.info-card:hover { box-shadow: var(--shadow-xl); }
.info-card.blue { background: linear-gradient(to bottom right, #eff6ff, #eef2ff); }
.info-card.purple { background: linear-gradient(to bottom right, #faf5ff, #fdf2f8); }
.info-card-icon { display: flex; height: 2.5rem; width: 2.5rem; align-items: center; justify-content: center; border-radius: var(--radius); color: #fff; font-size: 1.25rem; }
.info-card.blue .info-card-icon { background: var(--blue-600); }
.info-card.purple .info-card-icon { background: #9333ea; }
.info-card-head { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.info-card h3 { font-size: 1.25rem; font-weight: 600; color: var(--gray-900); }
.info-card p { font-size: 0.875rem; color: var(--gray-600); }
.info-card .arrow { height: 1.5rem; width: 1.5rem; flex-shrink: 0; margin-left: 1rem; transition: transform 0.3s; }
.info-card.blue .arrow { color: var(--blue-600); }
.info-card.purple .arrow { color: #9333ea; }
.info-card:hover .arrow { transform: translateX(0.25rem); }

/* ---------- Code examples ---------- */
.code-section { padding: 4rem 1rem; }
.code-wrap { max-width: 64rem; margin: 0 auto; }
.code-head { text-align: center; margin-bottom: 2rem; }
.code-head h2 { font-size: 1.875rem; font-weight: 700; color: var(--gray-900); }
.code-head p { margin-top: 1rem; font-size: 1.125rem; color: var(--gray-600); }
.code-box { background: var(--gray-900); border-radius: 1rem; box-shadow: var(--shadow-2xl); overflow: hidden; }
.code-tabs { display: flex; border-bottom: 1px solid var(--gray-800); }
.code-tab {
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-400);
  background: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 2px solid transparent;
}
.code-tab:hover { color: #fff; background: rgba(31, 41, 55, 0.5); }
.code-tab.active { background: var(--gray-800); color: #fff; border-bottom-color: var(--blue-600); }
.code-copy {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}
.code-copy:hover { color: #fff; }
.code-copy.copied { color: #4ade80; background: rgba(20, 83, 45, 0.2); }
.code-copy svg { width: 1.25rem; height: 1.25rem; }
.code-body { padding: 1.5rem; overflow-x: auto; }
.code-body pre { font-family: "SF Mono", Menlo, Monaco, Consolas, monospace; font-size: 0.875rem; color: var(--gray-300); white-space: pre; }
.code-pane { display: none; }
.code-pane.active { display: block; }

.code-steps { margin-top: 2rem; display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
@media (min-width: 768px) { .code-steps { grid-template-columns: repeat(3, 1fr); } }
.code-step { text-align: center; }
.code-step-num {
  margin: 0 auto;
  width: 3rem;
  height: 3rem;
  background: #dbeafe;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-600);
  font-weight: 700;
  font-size: 1.25rem;
}
.code-step h3 { margin-top: 1rem; font-weight: 600; color: var(--gray-900); }
.code-step p { margin-top: 0.5rem; font-size: 0.875rem; color: var(--gray-600); }

/* ---------- FAQ ---------- */
.faq-section { padding: 8rem 0; background: var(--gray-50); }
.faq-list { margin-top: 4rem; max-width: 56rem; margin-left: auto; margin-right: auto; }
.faq-item { border: 1px solid var(--gray-200); border-radius: 0.75rem; background: #fff; margin-bottom: 1rem; overflow: hidden; }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
}
.faq-q:hover { background: var(--gray-50); }
.faq-q .chevron { flex-shrink: 0; width: 1.25rem; height: 1.25rem; color: var(--gray-400); transition: transform 0.3s; }
.faq-item.open .chevron { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-a-inner { padding: 0 1.5rem 1.25rem; color: var(--gray-600); font-size: 0.9375rem; }
.faq-a-inner ul { margin-top: 0.5rem; }
.faq-a-inner ul.disc { list-style: disc; padding-left: 1.25rem; }
.faq-a-inner li { margin-bottom: 0.5rem; }
.faq-a-inner a { color: var(--blue-600); text-decoration: underline; }
.faq-a-inner p { margin-top: 0.75rem; }

/* ---------- Contact ---------- */
.contact-section { background: linear-gradient(to bottom right, #dbeafe, #e0e7ff); padding: 8rem 0; }
.contact-email { margin-top: 3rem; text-align: center; }
.contact-icon {
  margin: 0 auto;
  height: 3rem;
  width: 3rem;
  background: linear-gradient(to bottom right, #3b82f6, #6366f1);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
}
.contact-email h3 { margin-top: 1rem; font-size: 1.125rem; font-weight: 600; color: var(--gray-900); }
.contact-email p { margin-top: 0.5rem; }
.contact-email a { color: var(--blue-600); }
.contact-email a:hover { color: var(--blue-700); }
.contact-wechat { margin-top: 2.5rem; text-align: center; }
.contact-wechat h3 { margin-top: 1rem; font-size: 1.125rem; font-weight: 600; color: var(--gray-900); }
.contact-wechat img { margin: 0.75rem auto 0; width: 120px; height: 120px; border-radius: var(--radius); border: 1px solid var(--gray-200); }
.contact-wechat .link { margin-top: 0.5rem; display: inline-block; font-size: 0.875rem; color: var(--blue-600); }
.contact-cta { margin-top: 3rem; text-align: center; }

/* ---------- Footer ---------- */
.footer {
  position: relative;
  background: linear-gradient(to bottom right, var(--gray-900), var(--gray-800), var(--gray-900));
  color: var(--gray-300);
  overflow: hidden;
}
.footer-inner { position: relative; padding: 4rem 0; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } .footer-brand { grid-column: span 2; } }
.footer-brand .brand { display: flex; align-items: center; gap: 0.5rem; }
.footer-brand img { height: 2.5rem; width: 2.5rem; }
.footer-brand .brand span { font-size: 1.5rem; font-weight: 700; color: #fff; }
.footer-brand p { margin-top: 1rem; font-size: 0.875rem; color: var(--gray-400); }
.footer-brand code { background: rgba(31, 41, 55, 0.5); padding: 0.125rem 0.5rem; border-radius: 0.25rem; font-size: 0.75rem; border: 1px solid var(--gray-700); }
.footer-col h3 { color: #fff; font-weight: 600; margin-bottom: 1rem; }
.footer-col ul { display: flex; flex-direction: column; gap: 0.75rem; font-size: 0.875rem; }
.footer-col a { display: flex; align-items: center; gap: 0.5rem; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-dot { width: 0.25rem; height: 0.25rem; border-radius: 9999px; }
.dot-blue { background: #3b82f6; }
.dot-indigo { background: #6366f1; }
.dot-purple { background: #a855f7; }
.footer-bottom { margin-top: 2rem; padding-top: 2rem; border-top: 1px solid rgba(55, 65, 81, 0.5); }
.footer-bottom-inner { display: flex; flex-direction: column; gap: 1rem; align-items: center; justify-content: space-between; }
.footer-bottom p { font-size: 0.875rem; color: var(--gray-400); }
.footer-bottom a { color: var(--gray-300); text-decoration: underline; }
.footer-bottom a:hover { color: #fff; }
.footer-blur1 { position: absolute; top: -10rem; right: -10rem; width: 20rem; height: 20rem; background: linear-gradient(to bottom right, #3b82f6, #4f46e5); border-radius: 9999px; filter: blur(64px); opacity: 0.1; }
.footer-blur2 { position: absolute; bottom: -10rem; left: -10rem; width: 20rem; height: 20rem; background: linear-gradient(to bottom right, #6366f1, #9333ea); border-radius: 9999px; filter: blur(64px); opacity: 0.1; }
@media (min-width: 768px) { .footer-bottom-inner { flex-direction: row; } }