/* ============================================
   胡子老帽AI代充 · Apple 风格简约设计
   白底 / 大留白 / 微圆角 / 细阴影 / SF Pro 字体
   ============================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: #1d1d1f;
  background: #fff;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .7; }
img { display: block; max-width: 100%; }
button, input, select, textarea {
  font: inherit; color: inherit; border: none; outline: none; background: none;
}
ul { list-style: none; }

/* ---------- Layout ---------- */
.section-inner {
  max-width: 1068px;
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 100px 0; }
.section:nth-child(even) { background: #f5f5f7; }

/* ---------- Section Header ---------- */
.section-header { text-align: center; margin-bottom: 64px; }
.section-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.15;
  margin-bottom: 12px;
}
.section-sub {
  font-size: 17px;
  color: #86868b;
  letter-spacing: .01em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 26px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all .25s ease;
  white-space: nowrap;
  user-select: none;
}
.btn-primary {
  background: #0071e3;
  color: #fff;
}
.btn-primary:hover { background: #0077ed; opacity: 1; transform: scale(1.02); }
.btn-secondary {
  background: transparent;
  color: #0071e3;
  border: 1.5px solid #0071e3;
}
.btn-secondary:hover { background: rgba(0,113,227,.06); opacity: 1; transform: scale(1.02); }
.btn-ghost {
  background: transparent;
  color: #1d1d1f;
  border: 1.5px solid #d2d2d7;
}
.btn-ghost:hover { background: rgba(0,0,0,.03); opacity: 1; }
.btn-block { width: 100%; }

/* ---------- Nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,.08);
}
.nav-inner {
  max-width: 1068px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 52px; padding: 0 24px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none !important; opacity: 1 !important;
}
.nav-logo-img {
  width: 32px; height: 32px; border-radius: 50%; object-fit: cover;
}
.nav-brand {
  font-size: 17px; font-weight: 600; letter-spacing: -.01em;
}
.brand-accent {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex; align-items: center; gap: 28px;
  font-size: 14px; font-weight: 400; color: #1d1d1f;
}
.nav-links a { transition: color .2s; }
.nav-links a:hover { color: #0071e3; opacity: 1; }
.nav-cta {
  background: #0071e3 !important; color: #fff !important;
  padding: 6px 18px; border-radius: 980px; font-size: 13px; font-weight: 500;
}
.nav-cta:hover { background: #0077ed !important; opacity: 1 !important; }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  width: 22px; cursor: pointer; padding: 4px 0;
}
.nav-toggle span {
  display: block; height: 1.5px; background: #1d1d1f;
  border-radius: 2px; transition: .25s;
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute; top: 52px; left: 0; right: 0;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(20px);
    flex-direction: column; padding: 16px 24px 24px;
    gap: 14px; border-bottom: 1px solid rgba(0,0,0,.08);
    transform: translateY(-100%); opacity: 0;
    pointer-events: none; transition: .3s ease;
  }
  .nav-links.show { transform: translateY(0); opacity: 1; pointer-events: all; }
}

/* ---------- Hero ---------- */
.hero {
  padding: 140px 0 100px;
  text-align: center;
  overflow: hidden;
}
.hero-inner { max-width: 720px; margin: 0 auto; padding: 0 24px; }
.hero-label {
  display: inline-block;
  font-size: 13px; font-weight: 500; color: #0071e3;
  background: rgba(0,113,227,.08);
  padding: 6px 16px; border-radius: 980px;
  margin-bottom: 24px;
  letter-spacing: .03em;
}
.hero-title {
  font-size: clamp(30px, 5.5vw, 56px);
  font-weight: 700; letter-spacing: -.02em;
  line-height: 1.2; margin-bottom: 20px;
  white-space: nowrap;
}
.grad {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(16px, 2.5vw, 19px);
  color: #86868b; line-height: 1.6; margin-bottom: 36px;
}

.hero-actions {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px;
}
.hero-actions .btn { min-width: 160px; padding: 14px 30px; font-size: 15px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  max-width: 600px; margin: 0 auto;
  padding-top: 40px;
  border-top: 1px solid #d2d2d7;
}
.hero-stat { text-align: center; }
.hs-num {
  display: block; font-size: 28px; font-weight: 700; color: #1d1d1f; letter-spacing: -.01em;
}
.hs-label {
  display: block; font-size: 12px; color: #86868b; margin-top: 4px; letter-spacing: .02em;
}
@media (max-width: 520px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .hs-num { font-size: 24px; }
}

/* ---------- Products ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .product-grid { grid-template-columns: 1fr; } }

.product-card {
  background: #fff;
  border: 1px solid #e8e8ed;
  border-radius: 18px;
  padding: 28px 24px;
  position: relative;
  transition: transform .35s ease, box-shadow .35s ease;
  display: flex;
  flex-direction: column;
}
.section:nth-child(even) .product-card { background: #fff; }
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,.08);
}

/* 产品卡片顶部标签条 */
.pc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f5f5f7;
  border-radius: 12px;
  padding: 8px 14px;
  margin-bottom: 16px;
}
.pc-badge {
  display: inline-block; font-size: 11px; font-weight: 600;
  padding: 3px 10px; border-radius: 980px;
  background: #f5f5f7; color: #86868b; letter-spacing: .04em;
}
.pc-hot { background: rgba(0,198,154,.1); color: #00c69a; }
.pc-platform {
  display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: .05em;
  padding: 3px 10px; border-radius: 6px;
}
.pc-gpt { background: rgba(16,163,127,.1); color: #10a37f; }
.pc-claude { background: rgba(210,99,45,.1); color: #d2632d; }
.pc-gemini { background: rgba(66,133,244,.1); color: #4285f4; }
.pc-api { background: rgba(120,120,128,.1); color: #787880; }

.pc-title { font-size: 19px; font-weight: 600; margin: 0 0 8px; letter-spacing: -.01em; }
.pc-desc { font-size: 14px; color: #86868b; line-height: 1.55; margin-bottom: 16px; }
.pc-price { margin-bottom: 16px; }
.pc-cur { font-size: 16px; font-weight: 600; vertical-align: top; }
.pc-amount { font-size: 32px; font-weight: 700; letter-spacing: -.02em; }
.pc-unit { font-size: 14px; color: #86868b; font-weight: 400; }

.pc-feats { margin-bottom: 20px; flex: 1; }
.product-card > .btn { margin-top: auto; }
.pc-feats li {
  font-size: 13px; color: #424245; padding: 4px 0;
  padding-left: 18px; position: relative;
}
.pc-feats li::before {
  content: ""; position: absolute; left: 0; top: 11px;
  width: 6px; height: 6px; border-radius: 50%;
  background: #0071e3;
}

.note {
  text-align: center; font-size: 13px; color: #86868b;
  margin-top: 36px; line-height: 1.6;
}

/* ---------- Reviews ---------- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .review-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .review-grid { grid-template-columns: 1fr; } }

.review-card {
  background: #fff;
  border: 1px solid #e8e8ed;
  border-radius: 16px;
  padding: 24px;
  transition: transform .3s ease, box-shadow .3s ease;
}
.section:nth-child(even) .review-card { background: #fff; }
.review-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,.06);
}
.review-stars { color: #ffb800; font-size: 15px; margin-bottom: 12px; letter-spacing: 2px; }
.review-text {
  font-size: 14px; color: #424245; line-height: 1.65; margin-bottom: 16px;
}
.review-meta {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px;
}
.review-name { font-weight: 600; color: #1d1d1f; }
.review-prod { color: #86868b; font-size: 12px; }

/* ---------- Steps ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 768px) { .steps-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .steps-grid { grid-template-columns: 1fr; } }

.step-item {
  text-align: center; padding: 32px 20px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid #e8e8ed;
  transition: transform .3s ease;
}
.step-item:hover { transform: translateY(-3px); }
.step-num {
  font-size: 36px; font-weight: 800; color: #0071e3;
  letter-spacing: -.02em; margin-bottom: 12px;
  opacity: .85;
}
.step-item h4 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.step-item p { font-size: 13px; color: #86868b; line-height: 1.55; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid #d2d2d7;
}
.faq-q {
  display: flex; justify-content: space-between; align-items: center;
  width: 100%; padding: 20px 0;
  font-size: 15px; font-weight: 600; color: #1d1d1f;
  cursor: pointer; text-align: left; background: none;
  transition: color .2s;
}
.faq-q:hover { color: #0071e3; }
.faq-icon {
  font-size: 22px; font-weight: 300; color: #86868b;
  transition: transform .3s; flex-shrink: 0; margin-left: 16px;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height .35s ease;
}
.faq-a p { padding: 0 0 20px; font-size: 14px; color: #86868b; line-height: 1.65; }

/* ---------- Order Section ---------- */
.order-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 768px) { .order-wrap { grid-template-columns: 1fr; } }

.order-info { padding-right: 12px; }
.order-title { font-size: 28px; font-weight: 700; margin-bottom: 10px; letter-spacing: -.02em; }
.order-desc { font-size: 15px; color: #86868b; line-height: 1.6; margin-bottom: 24px; }

.order-contacts { margin-bottom: 20px; }
.order-contacts li {
  font-size: 14px; padding: 8px 0; color: #424245;
  display: flex; align-items: center; gap: 8px;
}
.oc-icon { font-size: 16px; }
.order-contacts a { color: #0071e3; font-weight: 500; }
.order-contacts a:hover { text-decoration: underline; opacity: 1; }

.order-tip {
  font-size: 13px; color: #86868b; line-height: 1.55;
  padding: 12px 16px; background: #f5f5f7; border-radius: 12px;
}

.order-form {
  background: #f5f5f7; border-radius: 18px; padding: 28px 24px;
}
.field { margin-bottom: 18px; }
.field label {
  display: block; font-size: 13px; font-weight: 600; color: #1d1d1f;
  margin-bottom: 6px; letter-spacing: .01em;
}
.field input,
.field select,
.field textarea {
  width: 100%; padding: 12px 16px;
  background: #fff; border: 1px solid #d2d2d7; border-radius: 10px;
  font-size: 15px; transition: border-color .2s;
}
.field input:focus,
.field select:focus,
.field textarea:focus { border-color: #0071e3; box-shadow: 0 0 0 3px rgba(0,113,227,.12); }
.form-note { font-size: 12px; color: #86868b; margin-top: 12px; text-align: center; }

/* ---------- Modal Overlay ---------- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.modal-overlay[hidden] { display: none; }
.modal-box {
  background: #fff; border-radius: 20px;
  padding: 36px 32px; max-width: 420px; width: 100%;
  text-align: center;
  animation: modalIn .25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(.95) translateY(10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-close {
  position: absolute; top: 14px; right: 18px;
  font-size: 28px; color: #86868b; cursor: pointer;
  background: none; border: none; line-height: 1;
  transition: color .2s;
}
.modal-close:hover { color: #1d1d1f; }
.modal-title { font-size: 22px; font-weight: 700; margin-bottom: 8px; letter-spacing: -.01em; }
.modal-sub { font-size: 14px; color: #86868b; margin-bottom: 20px; }

.modal-qr {
  display: inline-block; padding: 12px; background: #fff;
  border: 1px solid #e8e8ed; border-radius: 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,.06);
  margin-bottom: 14px;
}
.modal-qr img { width: 200px; height: 200px; border-radius: 10px; display: block; }
.modal-order {
  background: rgba(0,113,227,.06); border: 1px solid rgba(0,113,227,.15);
  border-radius: 12px; padding: 10px 14px; font-size: 13px;
  color: #1d1d1f; margin-bottom: 12px; text-align: left; word-break: break-all;
}
.modal-qq-num { font-size: 15px; margin-bottom: 16px; }
.modal-qq-num b { color: #0071e3; font-weight: 700; }

/* Pay Modal specifics */
.modal-pay { max-width: 460px; text-align: left; }
.pay-form .field label { font-size: 13px; }
.pay-price-hint {
  color: #0071e3; font-size: 14px; font-weight: 600;
  margin-top: 6px; min-height: 18px;
}
.pay-toggle { display: flex; gap: 10px; }
.pay-opt {
  flex: 1; padding: 12px; border-radius: 10px;
  background: #f5f5f7; border: 1.5px solid #e8e8ed;
  color: #1d1d1f; cursor: pointer; font-size: 14px; font-weight: 600;
  transition: all .2s;
}
.pay-opt.active { border-color: #0071e3; background: rgba(0,113,227,.06); color: #0071e3; }

.pay-qr { text-align: center; }
.pay-qr-tip { font-size: 15px; margin-bottom: 14px; }
.pay-qr-tip strong { color: #0071e3; }
.pay-qr-line { font-size: 14px; margin: 10px 0 2px; }
.pay-amount-line { margin-top: 2px; }
.pay-amount { color: #0071e3; font-size: 22px; font-weight: 800; }
.pay-qr-note { color: #86868b; font-size: 13px; margin-bottom: 18px; line-height: 1.55; }

/* ---------- FAB ---------- */
.fab {
  position: fixed; bottom: 28px; right: 28px; z-index: 900;
  width: 54px; height: 54px; border-radius: 50%;
  background: #0071e3; color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; box-shadow: 0 4px 20px rgba(0,113,227,.35);
  transition: transform .25s, box-shadow .25s;
}
.fab:hover { transform: scale(1.08); opacity: 1 !important; box-shadow: 0 6px 28px rgba(0,113,227,.45); }

/* ---------- Footer ---------- */
.footer { background: #f5f5f7; padding: 56px 0 32px; border-top: 1px solid #e8e8ed; }
.footer-inner {
  max-width: 1068px; margin: 0 auto; padding: 0 24px;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.footer-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700;
}
.footer-logo { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; }
.footer-desc { font-size: 14px; color: #86868b; }
.footer-links { display: flex; gap: 20px; margin-top: 8px; }
.footer-links a { font-size: 13px; color: #86868b; }
.footer-links a:hover { color: #0071e3; opacity: 1; }

.footer-bottom {
  max-width: 1068px; margin: 32px auto 0; padding: 20px 24px 0;
  border-top: 1px solid #e8e8ed; text-align: center;
}
.disclaimer { font-size: 12px; color: #aeaeb2; line-height: 1.6; margin-bottom: 8px; }
.copyright { font-size: 12px; color: #aeaeb2; }

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- 立即下单 + 我们的保障（左右并排） ---------- */
.og-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: stretch;
}
.og-col {
  display: flex;
  flex-direction: column;
}
.og-title {
  font-size: clamp(24px, 3.8vw, 32px);
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 16px;
  flex-shrink: 0;
  text-align: center;
}
.og-right-title {
  text-align: center;
}
.og-left {
  background: #f5f5f7;
  border-radius: 20px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.order-desc {
  font-size: 15px;
  color: #86868b;
  line-height: 1.6;
  margin-bottom: 20px;
}
.og-right {
  background: #f5f5f7;
  border-radius: 20px;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.guarantee-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  flex: 1;
  align-content: center;
}
.guarantee-card {
  background: #f5f5f7;
  border-radius: 14px;
  padding: 20px 16px;
  text-align: center;
  transition: transform .3s, box-shadow .3s;
}
.guarantee-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,.08);
}
.gc-icon {
  font-size: 30px;
  margin-bottom: 8px;
  display: block;
}
.guarantee-card h3,
.guarantee-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  color: #1d1d1f;
}
.guarantee-card p {
  font-size: 12.5px;
  color: #86868b;
  line-height: 1.5;
}

/* 左侧卡片底部 QQ 二维码 */
.og-qq {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid #e0e0e2;
  text-align: center;
}
.og-qq img {
  width: 160px;
  height: 160px;
  border-radius: 10px;
  display: block;
  margin: 0 auto 8px;
}
.og-qq p {
  font-size: 14px;
  color: #424245;
}

/* ---------- 用户评价（滚动跑马灯） ---------- */
.review-track {
  overflow: hidden;
  margin-bottom: 16px;
}
.review-track:last-child { margin-bottom: 0; }
.review-marquee {
  display: flex;
  gap: 20px;
  width: max-content;
}
.review-track .review-card {
  flex-shrink: 0;
  width: 340px;
  background: #f5f5f7;
  border-radius: 16px;
  padding: 24px;
}
.review-track .review-stars {
  color: #ff9500;
  font-size: 14px;
  letter-spacing: 2px;
  margin-bottom: 10px;
}
.review-track .review-text {
  font-size: 14px;
  line-height: 1.65;
  color: #424245;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.review-track .review-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}
.review-track .review-name {
  font-weight: 600;
  color: #1d1d1f;
}
.review-track .review-prod {
  color: #86868b;
  font-size: 12px;
}

/* 向左滚动 */
.review-track-left .review-marquee {
  animation: marquee-left 40s linear infinite;
}
/* 向右滚动 */
.review-track-right .review-marquee {
  animation: marquee-right 45s linear infinite;
}

@keyframes marquee-left {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
@keyframes marquee-right {
  0%   { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

/* 悬停暂停 */
.review-track:hover .review-marquee {
  animation-play-state: paused;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .section { padding: 70px 0; }
  .section-header { margin-bottom: 44px; }
  .product-card { padding: 22px 18px; }
  .pc-amount { font-size: 26px; }
  .modal-box { padding: 28px 22px; }
  .order-form { padding: 22px 18px; }
  .fab { bottom: 20px; right: 20px; width: 48px; height: 48px; font-size: 21px; }
  .guarantee-grid { grid-template-columns: 1fr; gap: 14px; }
  .guarantee-card { padding: 24px 20px; }
  .review-track .review-card { width: 280px; padding: 18px; }
  .og-grid { grid-template-columns: 1fr; gap: 28px; }
  .og-left { padding: 28px 22px; }
}