/* ============================================================
   火烧云加速器 - 落地页样式
   color: #001d2f(背景) | #0C7485(品牌蓝绿) | #FE9C56(暖橙) | #F0EACF(奶油白)
   ============================================================ */

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

:root {
  --bg:       #001d2f;
  --bg2:      #0a1e2d;
  --bg3:      #001524;
  --brand:    #0C7485;
  --brand2:   #1B8094;
  --brand3:   #064950;
  --accent:   #FE9C56;
  --accent2:  #e8863f;
  --cream:    #F0EACF;
  --radius:   12px;
}

html { scroll-behavior: smooth; background: var(--bg); color: var(--cream); }

body {
  font-family: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--bg);
  color: var(--cream);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ── UTILS ─────────────────────────────────────────────── */
.container { max-width: 1152px; margin: 0 auto; padding: 0 1.5rem; }
.text-balance { text-wrap: balance; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

/* ── HEADER ─────────────────────────────────────────────── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  transition: background 0.3s, box-shadow 0.3s;
}
.site-header.scrolled {
  background: rgba(0,29,47,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 4rem;
}
.logo { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.logo-icon {
  width: 2rem; height: 2rem; border-radius: 0.5rem;
  background: var(--brand); display: flex; align-items: center; justify-content: center;
}
.logo-text { font-weight: 700; font-size: 1.125rem; letter-spacing: 0.05em; color: var(--cream); }

.nav-desktop { display: none; align-items: center; gap: 1.5rem; }
.nav-desktop a { font-size: 0.875rem; color: rgba(240,234,207,0.8); transition: color 0.2s; }
.nav-desktop a:hover { color: var(--accent); }

.header-cta { display: none; align-items: center; gap: 0.75rem; }
.btn-ghost { font-size: 0.875rem; color: rgba(240,234,207,0.7); transition: color 0.2s; }
.btn-ghost:hover { color: var(--cream); }
.btn-primary-sm {
  font-size: 0.875rem; padding: 0.5rem 1rem; border-radius: 0.5rem;
  background: var(--brand); color: var(--cream); font-weight: 500; transition: background 0.2s;
}
.btn-primary-sm:hover { background: var(--brand2); }

.hamburger { display: flex; flex-direction: column; gap: 0.375rem; padding: 0.5rem; margin-right: -0.5rem; }
.hamburger span {
  display: block; width: 1.25rem; height: 2px; background: var(--cream);
  transition: transform 0.2s, opacity 0.2s;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(0, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(0, -5px); }

.nav-mobile {
  background: rgba(0,29,47,0.98); border-top: 1px solid rgba(240,234,207,0.1);
  overflow: hidden; max-height: 0; opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}
.nav-mobile.open { max-height: 20rem; opacity: 1; }
.nav-mobile nav { padding: 1rem 1.5rem; display: flex; flex-direction: column; gap: 1rem; }
.nav-mobile a { color: rgba(240,234,207,0.8); transition: color 0.2s; padding: 0.25rem 0; }
.nav-mobile a:hover { color: var(--accent); }
.nav-mobile-cta {
  display: flex; gap: 0.75rem; padding-top: 0.5rem;
  border-top: 1px solid rgba(240,234,207,0.1);
}
.nav-mobile-cta a {
  flex: 1; text-align: center; padding: 0.5rem;
  border-radius: 0.5rem; font-size: 0.875rem;
}
.btn-outline-mobile { border: 1px solid rgba(240,234,207,0.2); color: rgba(240,234,207,0.8) !important; }
.btn-filled-mobile { background: var(--brand); color: var(--cream) !important; font-weight: 500; }

@media (min-width: 768px) {
  .nav-desktop { display: flex; }
  .header-cta { display: flex; }
  .hamburger { display: none; }
  .nav-mobile { display: none !important; }
}

/* ── HERO ────────────────────────────────────────────────── */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding-top: 4rem; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-blob1 {
  position: absolute; top: 25%; left: 25%;
  width: 24rem; height: 24rem; border-radius: 50%;
  background: rgba(12,116,133,0.1); filter: blur(80px);
}
.hero-blob2 {
  position: absolute; bottom: 25%; right: 25%;
  width: 16rem; height: 16rem; border-radius: 50%;
  background: rgba(254,156,86,0.08); filter: blur(80px);
}
.hero-grid {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.05;
}
.hero-inner { position: relative; width: 100%; padding: 6rem 0; }
.hero-content { max-width: 48rem; }
.hero-tag {
  display: inline-block; margin-bottom: 1rem;
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--accent);
}
.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.75rem); font-weight: 700;
  color: var(--cream); line-height: 1.15;
  margin-bottom: 1.5rem; min-height: 3.5rem;
}
.cursor {
  display: inline-block; width: 2px; height: 0.9em;
  background: var(--accent); margin-left: 4px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
.hero-desc {
  color: rgba(240,234,207,0.6); font-size: 1rem; line-height: 1.8;
  max-width: 40rem; margin-bottom: 2.5rem;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.5rem; }
.btn-hero-outline {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border-radius: var(--radius);
  border: 1px solid rgba(240,234,207,0.2); color: var(--cream);
  font-weight: 500; transition: border-color 0.2s, background 0.2s;
}
.btn-hero-outline:hover { border-color: rgba(240,234,207,0.4); background: rgba(240,234,207,0.05); }
.btn-hero-accent {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border-radius: var(--radius);
  background: var(--accent); color: var(--bg); font-weight: 600;
  transition: background 0.2s;
}
.btn-hero-accent:hover { background: var(--accent2); }
.hero-runtime {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 1rem; border-radius: 9999px;
  background: rgba(12,116,133,0.2); border: 1px solid rgba(12,116,133,0.3);
  font-size: 0.875rem; color: rgba(240,234,207,0.7);
}
.runtime-dot {
  width: 0.5rem; height: 0.5rem; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
  animation: pulse 2s infinite;
}
.runtime-val { color: var(--cream); font-weight: 500; font-variant-numeric: tabular-nums; }
.hero-globe {
  position: absolute; right: 0; top: 50%; transform: translateY(-50%);
  opacity: 0.6; pointer-events: none; display: none;
}
@media (min-width: 1024px) { .hero-globe { display: block; } }

@keyframes pulse {
  0%,100%{opacity:1; transform:scale(1)}
  50%{opacity:0.5; transform:scale(1.2)}
}

/* ── SECTIONS SHARED ─────────────────────────────────────── */
section { padding: 5rem 0; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem); font-weight: 700;
  color: var(--cream); margin-bottom: 0.75rem; text-wrap: balance;
}
.section-sub { color: rgba(240,234,207,0.5); font-size: 0.9375rem; }

/* ── FEATURES ────────────────────────────────────────────── */
.features { padding: 5rem 0 7rem; }
.features-list { display: flex; flex-direction: column; gap: 4rem; }
.feature-row {
  display: grid; gap: 2.5rem; align-items: center;
}
.feature-img { display: flex; justify-content: center; }
.feature-badge {
  display: inline-block; padding: 0.25rem 0.75rem; border-radius: 9999px;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 1rem;
}
.badge-teal { background: rgba(12,116,133,0.2); color: var(--brand2); border: 1px solid rgba(12,116,133,0.3); }
.badge-orange { background: rgba(254,156,86,0.15); color: var(--accent); border: 1px solid rgba(254,156,86,0.25); }
.feature-title {
  font-size: clamp(1.375rem, 2.5vw, 1.75rem); font-weight: 700;
  color: var(--cream); margin-bottom: 1rem; line-height: 1.3; text-wrap: balance;
}
.feature-desc { color: rgba(240,234,207,0.6); line-height: 1.8; }
@media (min-width: 768px) {
  .feature-row { grid-template-columns: 1fr 1fr; }
  .feature-flip .feature-img { order: 2; }
  .feature-flip .feature-text { order: 1; }
}

/* ── DOWNLOAD ────────────────────────────────────────────── */
.download-card {
  background: var(--bg2); border-radius: 1rem;
  border: 1px solid rgba(12,116,133,0.25); overflow: hidden;
}
.download-tabs { display: flex; border-bottom: 1px solid rgba(12,116,133,0.2); overflow-x: auto; }
.tab-btn {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 1rem 1.5rem; font-size: 0.875rem; font-weight: 500;
  white-space: nowrap; color: rgba(240,234,207,0.5);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.tab-btn.active {
  color: var(--accent); border-bottom-color: var(--accent);
  background: rgba(254,156,86,0.05);
}
.tab-btn:hover:not(.active) { color: rgba(240,234,207,0.8); }
.tab-btn svg { width: 1rem; height: 1rem; flex-shrink: 0; }
.tab-panel { display: none; padding: 2.5rem; }
.tab-panel.active { display: block; }
.dl-grid { display: grid; gap: 2rem; align-items: center; }
.dl-title { font-size: 1.25rem; font-weight: 700; color: var(--cream); margin-bottom: 1.25rem; }
.dl-features { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 2rem; }
.dl-feat { display: flex; align-items: center; gap: 0.75rem; color: rgba(240,234,207,0.7); font-size: 0.9375rem; }
.dl-feat svg { flex-shrink: 0; }
.dl-btns { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn-dl-primary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.625rem 1.25rem; border-radius: var(--radius);
  background: var(--accent); color: var(--bg); font-weight: 600; font-size: 0.875rem;
  transition: background 0.2s;
}
.btn-dl-primary:hover { background: var(--accent2); }
.btn-dl-secondary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.625rem 1.25rem; border-radius: var(--radius);
  border: 1px solid rgba(254,156,86,0.4); color: var(--accent);
  font-weight: 500; font-size: 0.875rem; transition: background 0.2s;
}
.btn-dl-secondary:hover { background: rgba(254,156,86,0.1); }
.dl-img { display: flex; justify-content: center; }
@media (min-width: 768px) { .dl-grid { grid-template-columns: 1fr 1fr; } }

/* ── PLANS ───────────────────────────────────────────────── */
.plans-grid {
  display: grid; gap: 1.5rem; max-width: 52rem; margin: 0 auto;
}
.plan-card {
  position: relative; border-radius: 1rem; padding: 1.5rem;
  display: flex; flex-direction: column;
  transition: transform 0.2s;
}
.plan-card:hover { transform: translateY(-4px); }
.plan-normal { background: var(--bg2); border: 1px solid rgba(12,116,133,0.25); }
.plan-highlight { background: rgba(12,116,133,0.2); border: 2px solid var(--brand); }
.plan-badge {
  position: absolute; top: -0.75rem; left: 50%; transform: translateX(-50%);
  padding: 0.25rem 0.75rem; border-radius: 9999px;
  background: var(--accent); color: var(--bg);
  font-size: 0.75rem; font-weight: 700; white-space: nowrap;
}
.plan-period { font-size: 1.0625rem; font-weight: 600; color: var(--cream); margin-bottom: 1rem; }
.plan-price-row { display: flex; align-items: flex-end; gap: 0.25rem; margin-bottom: 0.25rem; }
.plan-price { font-size: 2.5rem; font-weight: 700; color: var(--cream); line-height: 1; }
.plan-unit { font-size: 0.875rem; color: rgba(240,234,207,0.5); margin-bottom: 0.25rem; }
.plan-original { font-size: 0.875rem; color: rgba(240,234,207,0.4); text-decoration: line-through; margin-bottom: 0.25rem; }
.plan-desc { font-size: 0.875rem; color: rgba(240,234,207,0.6); margin-bottom: 0.25rem; }
.plan-desc .highlight { color: var(--accent); font-weight: 500; }
.plan-cta { margin-top: auto; padding-top: 1.5rem; }
.btn-plan-accent {
  display: block; text-align: center; padding: 0.75rem;
  border-radius: var(--radius); background: var(--accent);
  color: var(--bg); font-weight: 600; font-size: 0.875rem; transition: background 0.2s;
}
.btn-plan-accent:hover { background: var(--accent2); }
.btn-plan-outline {
  display: block; text-align: center; padding: 0.75rem;
  border-radius: var(--radius); border: 1px solid rgba(240,234,207,0.2);
  color: var(--cream); font-size: 0.875rem; transition: background 0.2s;
}
.btn-plan-outline:hover { background: rgba(240,234,207,0.05); }
.plans-note { text-align: center; color: rgba(240,234,207,0.35); font-size: 0.875rem; margin-top: 2rem; }
@media (min-width: 640px) { .plans-grid { grid-template-columns: repeat(3,1fr); } }

/* ── REVIEWS ─────────────────────────────────────────────── */
.reviews-grid { display: grid; gap: 1.25rem; }
.review-card {
  background: var(--bg2); border: 1px solid rgba(12,116,133,0.2);
  border-radius: 1rem; padding: 1.25rem;
  display: flex; flex-direction: column; gap: 1rem;
}
.review-meta { display: flex; align-items: center; justify-content: space-between; }
.review-loc { font-size: 0.75rem; color: rgba(240,234,207,0.45); }
.stars { display: flex; gap: 2px; }
.review-text { color: rgba(240,234,207,0.75); font-size: 0.875rem; line-height: 1.7; flex: 1; }
.review-author { display: flex; align-items: center; gap: 0.75rem; }
.avatar {
  width: 2rem; height: 2rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; color: var(--bg); flex-shrink: 0;
}
.review-email { font-size: 0.75rem; color: rgba(240,234,207,0.4); }
@media (min-width: 640px)  { .reviews-grid { grid-template-columns: repeat(2,1fr); } }
@media (min-width: 1024px) { .reviews-grid { grid-template-columns: repeat(4,1fr); } }

/* ── LOCATIONS ───────────────────────────────────────────── */
.locations { border-top: 1px solid rgba(12,116,133,0.15); }
.locations-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; }
.loc-item {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.75rem 1rem; border-radius: var(--radius);
  background: var(--bg2); border: 1px solid rgba(12,116,133,0.2);
  transition: border-color 0.2s;
}
.loc-item:hover { border-color: rgba(12,116,133,0.5); }
.loc-flag { font-size: 1.5rem; line-height: 1; }
.loc-name { font-size: 0.875rem; font-weight: 500; color: var(--cream); }
.loc-code { font-size: 0.75rem; color: rgba(240,234,207,0.4); }
.loc-status { position: relative; flex-shrink: 0; margin-left: 0.25rem; }
.loc-dot, .loc-ping {
  display: inline-block; width: 0.625rem; height: 0.625rem;
  border-radius: 50%; background: #4ade80;
}
.loc-ping {
  position: absolute; inset: 0;
  animation: ping 1.5s cubic-bezier(0,0,0.2,1) infinite;
  opacity: 0.75;
}
@keyframes ping { 75%,100%{transform:scale(2);opacity:0} }
.locations-note {
  margin-top: 2.5rem; display: flex; justify-content: center;
}
.locations-note-inner {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 1rem; border-radius: 9999px;
  background: rgba(12,116,133,0.15); border: 1px solid rgba(12,116,133,0.25);
  color: rgba(240,234,207,0.6); font-size: 0.875rem;
}

/* ── FAQ ─────────────────────────────────────────────────── */
.faq { border-top: 1px solid rgba(12,116,133,0.15); }
.faq-list { display: flex; flex-direction: column; gap: 0.75rem; max-width: 48rem; margin: 0 auto; }
.faq-item {
  border-radius: var(--radius); border: 1px solid rgba(12,116,133,0.2);
  background: var(--bg2); overflow: hidden; transition: border-color 0.2s, background 0.2s;
}
.faq-item.open { border-color: rgba(12,116,133,0.5); background: rgba(12,116,133,0.1); }
.faq-btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 1.25rem; text-align: left;
}
.faq-q { font-size: 0.9375rem; font-weight: 500; color: var(--cream); line-height: 1.4; }
.faq-chevron {
  flex-shrink: 0; color: var(--brand); transition: transform 0.2s;
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-body { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.open .faq-body { max-height: 20rem; }
.faq-a {
  padding: 0 1.25rem 1rem;
  color: rgba(240,234,207,0.6); font-size: 0.875rem; line-height: 1.8;
  white-space: pre-line;
}

/* ── FOOTER ──────────────────────────────────────────────── */
.site-footer { border-top: 1px solid rgba(12,116,133,0.15); }
.footer-cta-bar {
  background: rgba(12,116,133,0.1); border-bottom: 1px solid rgba(12,116,133,0.2);
  padding: 2.5rem 0; text-align: center;
}
.footer-cta-title {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem); font-weight: 700;
  color: var(--cream); margin-bottom: 0.75rem;
}
.footer-cta-sub { color: rgba(240,234,207,0.5); font-size: 0.875rem; margin-bottom: 1.5rem; }
.btn-footer-cta {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 2rem; border-radius: var(--radius);
  background: var(--accent); color: var(--bg); font-weight: 700; font-size: 0.875rem;
  transition: background 0.2s;
}
.btn-footer-cta:hover { background: var(--accent2); }
.footer-bottom { padding: 2rem 0; }
.footer-inner {
  display: flex; flex-direction: column; gap: 1.5rem;
  align-items: flex-start;
}
.footer-copy { color: rgba(240,234,207,0.4); font-size: 0.875rem; margin-bottom: 0.75rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-nav a { color: rgba(240,234,207,0.45); font-size: 0.75rem; transition: color 0.2s; }
.footer-nav a:hover { color: rgba(240,234,207,0.7); }
.footer-sites { display: flex; align-items: center; gap: 1rem; }
.footer-sites-label { color: rgba(240,234,207,0.3); font-size: 0.75rem; white-space: nowrap; }
.site-badges { display: flex; gap: 0.5rem; }
.site-badge {
  width: 2rem; height: 2rem; border-radius: 0.5rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.625rem; font-weight: 700;
}
@media (min-width: 640px) {
  .footer-inner { flex-direction: row; justify-content: space-between; align-items: center; }
}