/* ==========================================================================
   飘雪网盘 · VIP 方案页
   ========================================================================== */

:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --ink: #0d1b2a;
  --ink-2: #2c3e52;
  --muted: #65758a;
  --muted-2: #8b99aa;
  --line: #e1e8f1;
  --line-strong: #ccd8e6;
  --brand: #2f6fed;
  --brand-dark: #1f57cc;
  --brand-soft: #edf3ff;
  --navy: #0b1c2c;
  --green: #0f9f6e;
  --amber: #b7791f;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shadow-sm: 0 4px 16px rgba(20, 47, 82, 0.05);
  --shadow-md: 0 16px 38px rgba(20, 47, 82, 0.08);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
h1, h2, h3, p, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; }
::selection { background: rgba(47, 111, 237, 0.18); }
:focus-visible { outline: 3px solid rgba(47, 111, 237, 0.4); outline-offset: 3px; border-radius: 6px; }

.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.shell { width: min(1080px, calc(100% - 42px)); margin-inline: auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(225, 232, 241, 0.9);
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
}
.header-inner { display: flex; align-items: center; gap: 26px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand img { width: 32px; height: 32px; border-radius: 9px; box-shadow: 0 3px 10px rgba(20, 80, 160, 0.14); }
.brand-words { display: flex; flex-direction: column; line-height: 1.15; }
.brand-words strong { font-size: 14.5px; font-weight: 700; letter-spacing: 0.06em; }
.brand-words span { margin-top: 3px; color: var(--muted-2); font-family: var(--mono); font-size: 7px; letter-spacing: 0.13em; }
.site-nav { display: flex; gap: 4px; margin-left: auto; }
.site-nav a { padding: 7px 11px; border-radius: 8px; color: var(--muted); font-size: 12px; transition: color 0.18s ease, background 0.18s ease; }
.site-nav a:hover { color: var(--brand); background: var(--brand-soft); }
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 34px;
  padding: 7px 13px;
  border-radius: 9px;
  background: var(--brand);
  color: #fff;
  font-size: 11.5px;
  font-weight: 650;
  box-shadow: 0 6px 16px rgba(47, 111, 237, 0.2);
  transition: background 0.18s ease, transform 0.18s ease;
}
.header-cta .icon { width: 13px; height: 13px; }
.header-cta:hover { background: var(--brand-dark); transform: translateY(-1px); }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 58px 0 22px; }
.hero-bg {
  position: absolute;
  inset: -60px 0 auto;
  z-index: -1;
  height: 400px;
  background:
    radial-gradient(ellipse 600px 320px at 70% 10%, rgba(47, 111, 237, 0.09), transparent 68%),
    radial-gradient(ellipse 420px 260px at 10% 50%, rgba(103, 212, 241, 0.08), transparent 70%);
  pointer-events: none;
}
.hero-inner { max-width: 700px; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--brand);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 650;
  letter-spacing: 0.16em;
}
.eyebrow span { width: 24px; height: 1px; background: linear-gradient(90deg, var(--brand), transparent); }
.hero h1 {
  margin: 15px 0 13px;
  font-size: clamp(34px, 5vw, 47px);
  font-weight: 760;
  line-height: 1.18;
  letter-spacing: -0.045em;
}
.hero h1 span { color: var(--brand); }
.hero-lede { max-width: 560px; color: var(--muted); font-size: 14px; line-height: 1.8; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 17px; color: var(--muted); font-size: 11px; }
.hero-tags span { display: inline-flex; align-items: center; gap: 5px; }
.hero-tags .icon { width: 14px; height: 14px; color: var(--brand); }

/* Activation note */
.activation-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 14px 0 18px;
  padding: 11px 14px;
  border: 1px solid #dce8f8;
  border-radius: 11px;
  background: #f8fbff;
  color: #526b84;
  font-size: 11px;
  line-height: 1.55;
}
.activation-note > div { display: flex; align-items: flex-start; gap: 7px; min-width: 0; }
.activation-note .icon { width: 14px; height: 14px; margin-top: 1px; flex: none; color: var(--brand); }
.activation-note strong { color: #2c4c6c; font-weight: 650; }
.activation-note a { display: inline-flex; align-items: center; gap: 3px; flex: none; color: var(--brand); font-size: 10.5px; font-weight: 650; }
.activation-note a .icon { width: 12px; height: 12px; }

/* Plan cards */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.plan-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.plan-vip2 { border-color: #c8d9f3; }
.plan-vip3 {
  border-color: #b9cff0;
  background:
    radial-gradient(ellipse 260px 140px at 100% 0%, rgba(47, 111, 237, 0.07), transparent 70%),
    #fff;
  box-shadow: 0 16px 38px rgba(36, 79, 145, 0.09);
}
.plan-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.plan-label { color: var(--muted-2); font-family: var(--mono); font-size: 10px; font-weight: 600; letter-spacing: 0.08em; }
.plan-badge {
  padding: 3px 7px;
  border-radius: 4px;
  background: #f0f4f9;
  color: #5b7088;
  font-size: 8.5px;
  font-weight: 650;
}
.plan-vip2 .plan-badge { background: var(--brand-soft); color: var(--brand); }
.plan-vip3 .plan-badge { background: #0f2b49; color: #b9dcff; }
.plan-card h2 { margin-top: 15px; font-size: 20px; font-weight: 720; letter-spacing: -0.025em; }
.plan-desc { margin-top: 4px; min-height: 34px; color: var(--muted); font-size: 10.5px; line-height: 1.6; }
.plan-price {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-top: 14px;
  color: var(--ink);
  font-size: 34px;
  font-weight: 760;
  line-height: 1;
  letter-spacing: -0.04em;
}
.plan-price small { margin-right: 1px; font-size: 15px; font-weight: 650; letter-spacing: 0; }
.plan-price span { margin-left: 4px; color: var(--muted-2); font-size: 10px; font-weight: 500; letter-spacing: 0; }
.plan-unit { margin-top: 6px; color: var(--muted-2); font-size: 9.5px; }
.plan-features { display: grid; gap: 9px; margin-top: 16px; padding-top: 15px; border-top: 1px solid var(--line); list-style: none; }
.plan-features li { display: flex; align-items: flex-start; gap: 7px; color: #41566c; font-size: 10.5px; line-height: 1.55; }
.plan-features .icon { width: 13px; height: 13px; margin-top: 1px; color: var(--green); }
.plan-features li.is-off { color: #9aa8b8; }
.plan-features li.is-off .icon { color: #b4c0cd; }
.plan-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-height: 40px;
  margin-top: auto;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: #fff;
  color: var(--ink-2);
  font-size: 11px;
  font-weight: 650;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.plan-cta .icon { width: 13px; height: 13px; }
.plan-cta:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-soft); }
.plan-vip2 .plan-cta { border-color: var(--brand); background: var(--brand); color: #fff; box-shadow: 0 7px 16px rgba(47, 111, 237, 0.18); }
.plan-vip2 .plan-cta:hover { background: var(--brand-dark); color: #fff; }
.plan-vip3 .plan-cta { border-color: #163d62; background: #0f2b49; color: #fff; }
.plan-vip3 .plan-cta:hover { background: #163d62; border-color: #163d62; color: #fff; }
.choice-note {
  margin: 13px 0 0;
  padding: 9px 12px;
  border-radius: 8px;
  background: #eef3f9;
  color: #60748a;
  font-size: 10px;
  line-height: 1.6;
  text-align: center;
}
.choice-note strong { color: #3f5872; }

/* Section heads */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
.section-kicker { display: flex; align-items: center; gap: 7px; margin-bottom: 5px; color: var(--brand); font-family: var(--mono); font-size: 8.5px; font-weight: 650; letter-spacing: 0.14em; }
.section-kicker span { display: inline-grid; place-items: center; width: 20px; height: 16px; border-radius: 4px; background: var(--brand-soft); color: var(--brand); font-size: 7.5px; letter-spacing: 0; }
.section-head h2 { font-size: 23px; font-weight: 720; line-height: 1.25; letter-spacing: -0.03em; }
.section-head > p { padding-bottom: 2px; color: var(--muted-2); font-size: 10.5px; white-space: nowrap; }

/* Compare */
.compare-section { margin-top: 42px; }
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}
.compare-table { width: 100%; min-width: 620px; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 12px 15px; border-bottom: 1px solid #edf2f8; font-size: 10.5px; }
.compare-table thead th { background: #f8fafd; color: var(--muted); font-size: 9.5px; font-weight: 650; }
.compare-table thead th:not(:first-child) { text-align: center; }
.compare-table tbody th { width: 28%; color: #52677d; font-weight: 500; }
.compare-table tbody td { text-align: center; color: #334a61; }
.compare-table tbody tr:last-child th, .compare-table tbody tr:last-child td { border-bottom: 0; }
.compare-table tbody tr:nth-child(even) th, .compare-table tbody tr:nth-child(even) td { background: #fcfdff; }
.compare-table strong { color: var(--ink); font-weight: 700; }
.yes { color: var(--green); font-weight: 600; }
.no { color: #9aa8b8; }

/* FAQ */
.faq-section { margin-top: 42px; }
.faq-list { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: var(--shadow-sm); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 0; }
.faq-item summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 13px 15px; color: var(--ink-2); font-size: 11px; font-weight: 600; cursor: pointer; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: #fafcff; }
.faq-chevron { width: 14px; height: 14px; color: var(--muted-2); transition: transform 0.2s ease; }
.faq-item[open] .faq-chevron { transform: rotate(180deg); color: var(--brand); }
.faq-answer { padding: 0 15px 13px; color: var(--muted); font-size: 10px; line-height: 1.8; }
.faq-answer a { color: var(--brand); text-decoration: underline; text-underline-offset: 2px; }

/* Bottom CTA */
.bottom-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin: 44px 0 20px;
  padding: 26px 28px;
  border-radius: 18px;
  background:
    radial-gradient(ellipse 380px 220px at 100% 0%, rgba(76, 139, 255, 0.28), transparent 70%),
    linear-gradient(145deg, #0d243a, #081828);
  color: #eef8ff;
  box-shadow: 0 18px 42px rgba(7, 24, 40, 0.16);
}
.bottom-cta .section-kicker { color: #8dbfff; margin-bottom: 7px; }
.bottom-cta .section-kicker span { background: rgba(255, 255, 255, 0.08); color: #9cc8ff; }
.bottom-cta h2 { font-size: 23px; font-weight: 720; letter-spacing: -0.025em; }
.bottom-cta p { margin-top: 4px; color: rgba(218, 237, 255, 0.62); font-size: 10.5px; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 42px;
  padding: 10px 17px;
  border-radius: 9px;
  background: #fff;
  color: #12364f;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.btn-primary .icon { width: 13px; height: 13px; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(0, 0, 0, 0.18); }

/* Footer */
.site-footer { margin-top: 24px; padding: 28px 0 22px; border-top: 1px solid var(--line); background: #fff; }
.footer-inner { display: flex; align-items: center; gap: 22px; }
.footer-brand { display: flex; align-items: center; gap: 9px; }
.footer-brand img { width: 27px; height: 27px; border-radius: 7px; }
.footer-brand div { display: flex; flex-direction: column; line-height: 1.2; }
.footer-brand strong { font-size: 12px; letter-spacing: 0.05em; }
.footer-brand span { margin-top: 2px; color: var(--muted-2); font-family: var(--mono); font-size: 6.5px; letter-spacing: 0.1em; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; margin-left: auto; }
.footer-links a { color: var(--muted); font-size: 9.5px; }
.footer-links a:hover { color: var(--brand); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 20px; padding-top: 14px; border-top: 1px solid #eef3f9; color: #98a7b8; font-size: 8.5px; }

/* Responsive */
@media (max-width: 900px) {
  .plans { grid-template-columns: 1fr; gap: 12px; }
  .plan-card { padding: 18px; }
  .plan-desc { min-height: 0; }
  .plan-features { grid-template-columns: 1fr 1fr; }
  .plan-cta { margin-top: 14px; }
}

@media (max-width: 760px) {
  .shell { width: calc(100% - 32px); }
  .site-nav { display: none; }
  .header-cta { margin-left: auto; }
  .hero { padding-top: 42px; }
  .hero h1 { font-size: 36px; }
  .hero-lede { font-size: 13px; }
  .activation-note { align-items: flex-start; flex-direction: column; gap: 8px; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 4px; }
  .section-head h2 { font-size: 21px; }
  .section-head > p { padding-bottom: 0; white-space: normal; }
  .bottom-cta { align-items: flex-start; flex-direction: column; gap: 18px; padding: 22px; }
  .bottom-cta .btn-primary { width: 100%; }
  .footer-inner { flex-wrap: wrap; }
  .footer-links { margin-left: 0; }
}

@media (max-width: 520px) {
  .shell { width: calc(100% - 28px); }
  .brand-words strong { font-size: 13.5px; }
  .header-cta { padding: 7px 10px; font-size: 10.5px; }
  .hero h1 { font-size: 32px; }
  .hero-tags { gap: 7px 13px; font-size: 10px; }
  .plan-features { grid-template-columns: 1fr; gap: 8px; }
  .compare-table th, .compare-table td { padding: 11px 12px; }
  .bottom-cta h2 { font-size: 20px; }
  .footer-bottom { align-items: flex-start; flex-direction: column; gap: 5px; }
}