:root {
  --ink: #0d5a83;
  --accent: #1e9de3;
  --accent-hover: #0d80bd;
  --grad: linear-gradient(135deg, #5ec8f2 0%, #2fabe5 48%, #1180c3 100%);
  --grad-deep: linear-gradient(160deg, #2fabe5 0%, #1e9de3 50%, #0d6ea8 100%);
  --soft: #daeffb;
  --text: #14283a;
  --muted: #506679;
  --dim: #7a92a4;
  --line: #b8dff2;
  --card-border: #a8d7f0;
  --bg: #eaf4fc;
  --bg-soft: #d8ecf9;
  --max: 1280px;
  --nav-h: 68px;
  --shadow: 0 1px 2px rgba(30, 157, 227, .10);
  --shadow-lg: 0 16px 36px -12px rgba(30, 157, 227, .32);
  --radius: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; }
body {
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-family: "Noto Sans SC", ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
img { max-width: 100%; display: block; }
h1, h2, h3, h4, p { margin: 0; }
.wrap { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.wrap-wide { width: min(1360px, calc(100% - 32px)); margin: 0 auto; }

/* header */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 28px;
  background: rgba(245, 251, 255, .82);
  border-bottom: 1px solid rgba(30, 157, 227, .18);
  box-shadow: 0 8px 24px -20px rgba(13, 90, 131, .35);
  backdrop-filter: blur(16px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 210px;
  flex-shrink: 0;
}
.brand img, .brand .logo {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 4px 10px rgba(30, 157, 227, .35));
}
.brand h1 {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  background: var(--grad-deep);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand small {
  display: block;
  margin-top: 1px;
  color: #7a97ac;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .02em;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 5px;
  border: 1px solid rgba(30, 157, 227, .18);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(232, 247, 254, .8), rgba(255, 255, 255, .6));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.6);
}
.nav-item {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 14px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #45607a;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; color: var(--accent); }
.nav-item:hover {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 6px 14px -8px rgba(30, 157, 227, .45);
  transform: translateY(-1px);
}
.nav-item.active {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 10px 20px -8px rgba(30, 157, 227, .6);
}
.nav-item.active svg { color: #fff; }
.nav-item.gold { color: var(--accent-hover); font-weight: 600; }
.nav-item.gold svg { color: var(--accent-hover); }
.nav-item.gold:hover { background: #fff; color: var(--ink); }
.nav-item.gold.active { background: var(--grad); color: #fff; }
.nav-item.gold.active svg { color: #fff; }
.nav-item .vip {
  display: inline-grid;
  min-width: 22px;
  height: 20px;
  padding: 0 6px;
  place-items: center;
  border-radius: 6px;
  background: linear-gradient(135deg, #fcd34d, #f59e0b);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .04em;
  box-shadow: 0 4px 10px -4px rgba(245, 158, 11, .55);
}
.nav-item.active .vip {
  background: rgba(255,255,255,.28);
  color: #fff;
  box-shadow: none;
}
.nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-actions .btn { height: 38px; padding: 0 18px; border-radius: 999px; font-weight: 600; }
.nav-actions .btn-ghost {
  background: #fff;
  border: 1px solid rgba(30, 157, 227, .28);
  color: var(--ink);
}
.nav-actions .btn-ghost:hover {
  background: var(--soft);
  border-color: var(--accent);
}
.nav-actions .btn-login {
  padding: 0 22px;
  color: #fff;
  background: var(--grad-deep);
  box-shadow: 0 10px 22px -10px rgba(30, 157, 227, .7);
}
.nav-actions .btn-login:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 28px -10px rgba(30, 157, 227, .75);
}
.menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  border: 0;
  background: transparent;
  color: #111;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 36px;
  padding: 0 16px;
  border: 0;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease, filter .15s ease;
}
.btn:hover { filter: brightness(1.03); }
.btn-ghost {
  color: var(--accent);
  background: #fff;
  border: 1px solid rgba(30, 157, 227, .28);
}
.btn-login {
  color: #fff;
  background: var(--grad);
  box-shadow: 0 8px 18px -8px rgba(30, 157, 227, .45);
}
.btn-cta {
  height: 48px;
  padding: 0 32px;
  color: #fff;
  background: var(--grad-deep);
  font-size: 18px;
  box-shadow: 0 12px 28px -10px rgba(30, 157, 227, .45);
}
.btn-cta:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn-white {
  height: 44px;
  padding: 0 28px;
  color: var(--ink);
  background: #fff;
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 8px 20px rgba(13, 90, 131, .12);
}
.btn-orange {
  color: #fff;
  background: var(--grad);
}
.btn-green {
  color: #fff;
  background: linear-gradient(135deg, #9fe0fa, #5ec8f2);
  height: 40px;
  border-radius: 10px;
  font-weight: 600;
}
.btn-blue { color: #fff; background: var(--grad-deep); }
.btn-block { width: 100%; }

/* hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 56px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% -10%, rgba(186, 230, 253, .7), transparent 58%),
    radial-gradient(circle at 12% 28%, rgba(224, 242, 254, .95), transparent 26%),
    radial-gradient(circle at 88% 18%, rgba(125, 211, 252, .42), transparent 24%),
    linear-gradient(180deg, #e6f6fe 0%, #f6fbff 62%);
}
.hero .dot {
  position: absolute;
  border-radius: 99px;
  pointer-events: none;
  animation: float 5s ease-in-out infinite;
}
.hero .dot.d1 { width: 8px; height: 8px; left: 22%; top: 28%; background: #7ec8f0; }
.hero .dot.d2 { width: 6px; height: 6px; right: 24%; top: 34%; background: #b8e4f8; animation-delay: .8s; }
.hero .dot.d3 { width: 10px; height: 10px; left: 32%; top: 58%; background: #93d5f5; animation-delay: 1.4s; }
@keyframes float {
  0%, 100% { transform: translateY(0); opacity: .9; }
  50% { transform: translateY(-14px); opacity: .55; }
}
.hero-viewport {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  overflow: hidden;
}
.hero-track {
  display: flex;
  transition: transform .55s ease;
}
.hero-slide {
  flex: 0 0 100%;
  min-width: 0;
  padding: 8px 24px 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.hero-slide .badge { margin-top: 0; }
.hero-slide h2 {
  max-width: 720px;
  margin: 4px auto 0;
  color: #1f2937;
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 800;
  line-height: 1.35;
}
.hero-slide .lead {
  max-width: 640px;
  margin: 0 auto;
  color: #6b7f92;
  font-size: 16px;
}
.hero-slide .btn-cta { margin-top: 10px; }
.hero-arrow {
  position: absolute;
  top: 50%;
  z-index: 3;
  width: 40px;
  height: 40px;
  margin-top: -20px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 8px 20px rgba(13, 90, 131, .16);
  font-size: 24px;
  line-height: 1;
}
.hero-arrow.prev { left: 24px; }
.hero-arrow.next { right: 24px; }
.hero-arrow:hover { background: var(--soft); }
.hero-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}
.hero-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 99px;
  background: rgba(30, 157, 227, .28);
}
.hero-dot.active {
  width: 22px;
  background: var(--grad);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 0 0 1px var(--line);
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}
.hero-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 8px 0 24px;
}
.hero-brand img { width: 56px; height: 56px; }
.hero-brand .name {
  background: var(--grad-deep);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(48px, 7vw, 72px);
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1;
}

/* sections */
.section { padding: 72px 0; }
.section.alt {
  background: linear-gradient(180deg, #fff, #eef8fe 55%, #fff);
}
.section-title {
  text-align: center;
  background: var(--grad-deep);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 800;
}
.section-title.lined {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.section-title.lined::after {
  width: 84px;
  height: 10px;
  background: no-repeat center / contain url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 84 10'><path d='M2 7C18 2 36 9 52 4c16-5 24 2 30 1' stroke='%235bb8ea' stroke-width='3' fill='none' stroke-linecap='round'/></svg>");
  content: "";
}
.center { text-align: center; }
.section-sub {
  margin-top: 10px;
  color: #9ca3af;
  font-size: 15px;
  text-align: center;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 40px;
}
.feature {
  --feat-line: linear-gradient(135deg, #9fe0fa, #3bb8ea);
  --feat-icon: linear-gradient(135deg, #7ed4f6, #3bb8ea);
  --feat-soft: #eef9fe;
  --feat-glow: rgba(30, 157, 227, .28);
  min-height: 200px;
  padding: 24px;
  border: 2px solid transparent;
  border-radius: 16px;
  background:
    linear-gradient(#fff, #fff) padding-box,
    var(--feat-line) border-box;
  box-shadow: 0 10px 24px -16px var(--feat-glow);
  transition: box-shadow .2s ease, transform .2s ease, background .2s ease;
}
.feature:hover {
  background:
    linear-gradient(var(--feat-soft), var(--feat-soft)) padding-box,
    var(--feat-line) border-box;
  box-shadow: 0 18px 36px -14px var(--feat-glow);
  transform: translateY(-4px);
}
.feat-sky {
  --feat-line: linear-gradient(135deg, #9fe0fa, #3bb8ea);
  --feat-icon: linear-gradient(135deg, #7ed4f6, #3bb8ea);
  --feat-soft: #eef9fe;
  --feat-glow: rgba(30, 157, 227, .32);
}
.feat-coral {
  --feat-line: linear-gradient(135deg, #fdba8c, #f97316);
  --feat-icon: linear-gradient(135deg, #fb923c, #ea580c);
  --feat-soft: #fff4ec;
  --feat-glow: rgba(249, 115, 22, .28);
}
.feat-violet {
  --feat-line: linear-gradient(135deg, #c4b5fd, #7c3aed);
  --feat-icon: linear-gradient(135deg, #a78bfa, #7c3aed);
  --feat-soft: #f5f3ff;
  --feat-glow: rgba(124, 58, 237, .28);
}
.feat-teal {
  --feat-line: linear-gradient(135deg, #99f6e4, #14b8a6);
  --feat-icon: linear-gradient(135deg, #2dd4bf, #0d9488);
  --feat-soft: #f0fdfa;
  --feat-glow: rgba(20, 184, 166, .28);
}
.feat-amber {
  --feat-line: linear-gradient(135deg, #fcd34d, #f59e0b);
  --feat-icon: linear-gradient(135deg, #fbbf24, #d97706);
  --feat-soft: #fffbeb;
  --feat-glow: rgba(245, 158, 11, .28);
}
.feat-rose {
  --feat-line: linear-gradient(135deg, #fda4af, #f43f5e);
  --feat-icon: linear-gradient(135deg, #fb7185, #e11d48);
  --feat-soft: #fff1f2;
  --feat-glow: rgba(244, 63, 94, .28);
}
.icon-box {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 12px;
  background: var(--grad);
  color: #fff;
  margin-bottom: 16px;
}
.feature .icon-box { background: var(--feat-icon); }
.icon-box svg { width: 24px; height: 24px; }
.feature h3 { font-size: 18px; font-weight: 700; }
.feature p { margin-top: 8px; color: #6b7280; font-size: 14px; line-height: 1.7; }

.track-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-top: 36px;
}
.track {
  --track-line: linear-gradient(135deg, #9fe0fa, #3bb8ea);
  --track-soft: #eef9fe;
  --track-glow: rgba(30, 157, 227, .28);
  display: flex;
  min-height: 92px;
  align-items: center;
  justify-content: center;
  border: 2px solid transparent;
  border-radius: 16px;
  background:
    linear-gradient(#fff, #fff) padding-box,
    var(--track-line) border-box;
  font-size: 16px;
  font-weight: 700;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.track:hover {
  transform: translateY(-4px);
  background:
    linear-gradient(var(--track-soft), var(--track-soft)) padding-box,
    var(--track-line) border-box;
  box-shadow: 0 16px 32px -14px var(--track-glow);
}
.track.blue {
  color: #1578b0;
  --track-line: linear-gradient(135deg, #9fe0fa, #3bb8ea);
  --track-soft: #eef9fe;
  --track-glow: rgba(30, 157, 227, .32);
}
.track.green {
  color: #0d9488;
  --track-line: linear-gradient(135deg, #99f6e4, #14b8a6);
  --track-soft: #f0fdfa;
  --track-glow: rgba(20, 184, 166, .28);
}
.track.purple {
  color: #6d28d9;
  --track-line: linear-gradient(135deg, #c4b5fd, #7c3aed);
  --track-soft: #f5f3ff;
  --track-glow: rgba(124, 58, 237, .28);
}
.track.orange {
  color: #c2410c;
  --track-line: linear-gradient(135deg, #fdba8c, #f97316);
  --track-soft: #fff4ec;
  --track-glow: rgba(249, 115, 22, .28);
}
.track.pink {
  color: #be123c;
  --track-line: linear-gradient(135deg, #fda4af, #f43f5e);
  --track-soft: #fff1f2;
  --track-glow: rgba(244, 63, 94, .28);
}
.track.gold {
  color: #b45309;
  --track-line: linear-gradient(135deg, #fcd34d, #f59e0b);
  --track-soft: #fffbeb;
  --track-glow: rgba(245, 158, 11, .28);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  max-width: 1040px;
  margin: 36px auto 0;
}
.why {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 56px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--soft);
  color: #374151;
  font-size: 14px;
}
.why span { font-size: 18px; }

.why-carousel {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) 36px;
  align-items: center;
  column-gap: 12px;
  max-width: 1080px;
  margin: 36px auto 0;
}
.why-viewport {
  grid-column: 2;
  grid-row: 1;
  overflow: hidden;
  padding: 12px 0;
  margin: -12px 0;
}
.why-track {
  display: flex;
  transition: transform .55s ease;
}
.why-page {
  flex: 0 0 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.why-card {
  --why-edge: #3bb8ea;
  --why-soft: #eef9fe;
  --why-glow: rgba(30, 157, 227, .28);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 132px;
  padding: 16px 18px;
  text-align: left;
  border: 2px solid var(--why-edge);
  border-radius: 16px;
  background: #fff;
  color: #1a2b3c;
  box-shadow: 0 10px 24px -16px var(--why-glow);
  transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease;
}
.why-card:hover,
.why-card:focus-within {
  transform: translateY(-3px);
  background: var(--why-soft);
  border-color: var(--why-edge);
  box-shadow: 0 16px 32px -14px var(--why-glow);
}
.why-card span { font-size: 22px; line-height: 1.2; flex-shrink: 0; }
.why-card h3 { font-size: 15px; font-weight: 700; line-height: 1.4; }
.why-card p { margin-top: 6px; color: #6b7280; font-size: 13px; line-height: 1.65; }
.why-page .why-card:nth-child(1) {
  --why-edge: #3bb8ea;
  --why-soft: #eef9fe;
  --why-glow: rgba(30, 157, 227, .32);
}
.why-page .why-card:nth-child(2) {
  --why-edge: #f97316;
  --why-soft: #fff4ec;
  --why-glow: rgba(249, 115, 22, .28);
}
.why-page .why-card:nth-child(3) {
  --why-edge: #7c3aed;
  --why-soft: #f5f3ff;
  --why-glow: rgba(124, 58, 237, .28);
}
.why-page .why-card:nth-child(4) {
  --why-edge: #14b8a6;
  --why-soft: #f0fdfa;
  --why-glow: rgba(20, 184, 166, .28);
}
.why-page .why-card:nth-child(5) {
  --why-edge: #f59e0b;
  --why-soft: #fffbeb;
  --why-glow: rgba(245, 158, 11, .28);
}
.why-page .why-card:nth-child(6) {
  --why-edge: #f43f5e;
  --why-soft: #fff1f2;
  --why-glow: rgba(244, 63, 94, .28);
}
.why-arrow {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 6px 18px rgba(13, 90, 131, .16);
  font-size: 22px;
  line-height: 1;
  grid-row: 1;
}
.why-arrow.prev { grid-column: 1; }
.why-arrow.next { grid-column: 3; }
.why-arrow:hover { background: var(--soft); }
.why-dots {
  grid-column: 1 / -1;
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 18px;
}
.why-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 99px;
  background: #cfeaf6;
}
.why-dot.active {
  width: 22px;
  background: var(--grad);
}

.cta-band {
  padding: 80px 24px;
  text-align: center;
  color: #fff;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255,255,255,.16), transparent 48%),
    var(--grad-deep);
}
.cta-band h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; }
.cta-band p { margin: 12px 0 28px; font-size: 16px; opacity: .95; }

.site-footer {
  padding: 28px 16px;
  background: linear-gradient(180deg, #eaf7fe 0%, #d6f0fc 100%);
  color: #4a6d82;
  text-align: center;
  font-size: 13px;
}
.site-footer a { color: var(--ink); }
.site-footer a:hover { color: var(--accent-hover); }
.site-footer .sub { margin-top: 8px; }

/* auth */
.auth-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  background: linear-gradient(160deg, #c8edfb 0%, #8fd9f8 42%, #5ec8f2 100%);
  position: relative;
}
.auth-page.with-nav { min-height: calc(100vh - var(--nav-h)); }
.auth-page::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.22) 1px, transparent 1px);
  background-size: 48px 48px;
  content: "";
  pointer-events: none;
}
.auth-left, .auth-right {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
}
.auth-copy { max-width: 460px; color: #1578b0; }
.auth-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.auth-logo .mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 12px;
  background: var(--grad-deep);
  color: #fff;
}
.auth-logo .name {
  font-size: 36px;
  font-weight: 800;
  background: var(--grad-deep);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.auth-copy h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.auth-copy p { color: #4a6d82; line-height: 1.7; max-width: 360px; }
.auth-pills { display: flex; gap: 28px; margin-top: 28px; color: #1578b0; font-size: 14px; }
.auth-pills span { display: inline-flex; align-items: center; gap: 6px; }
.auth-card {
  width: min(440px, 100%);
  padding: 32px 28px 24px;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 24px 60px rgba(0,0,0,.18);
}
.auth-card h3 { text-align: center; font-size: 22px; font-weight: 800; }
.auth-card .hint { text-align: center; color: #9ca3af; font-size: 13px; margin: 8px 0 18px; }
.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
  padding: 4px;
  border-radius: 10px;
  background: #f3f4f6;
}
.tabs button {
  height: 36px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #6b7280;
  font-weight: 600;
}
.tabs button.active {
  color: #fff;
  background: var(--grad);
}
.field { margin-bottom: 14px; }
.field label { display: block; margin-bottom: 6px; font-size: 13px; color: #374151; }
.input {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 12px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
}
.input:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(30, 157, 227, .16); }
.input input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: none;
  background: transparent;
  font-size: 14px;
}
.input svg, .field .ico { width: 16px; height: 16px; color: #9ca3af; flex-shrink: 0; }
.check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 14px;
  color: #4b5563;
  font-size: 13px;
}
.check a { color: var(--accent); }
.auth-submit {
  width: 100%;
  height: 42px;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--grad);
  font-weight: 600;
}
.auth-links { text-align: center; margin-top: 12px; font-size: 13px; color: #6b7280; }
.auth-links a { color: var(--accent); }
.gift {
  text-align: center;
  color: var(--accent);
  font-size: 13px;
  margin-bottom: 14px;
}
.captcha-row { display: grid; grid-template-columns: 1fr 110px; gap: 8px; align-items: center; }
.captcha-box {
  height: 42px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #f3f4f6;
  cursor: pointer;
  overflow: hidden;
}
.captcha-box canvas { width: 100%; height: 100%; display: block; }
.code-row { display: grid; grid-template-columns: 1fr 110px; gap: 8px; }
.tiny { margin-top: 6px; color: #9ca3af; font-size: 12px; }
.qr-panel {
  margin: 8px 0 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft);
  text-align: center;
}
.qr-panel .qr {
  width: 168px;
  height: 168px;
  margin: 0 auto 10px;
  background: #fff;
  border-radius: 8px;
  display: grid;
  place-items: center;
}
.qr-panel p { color: #6b7280; font-size: 12px; }
.hidden { display: none !important; }

/* app pages */
.app-page { min-height: calc(100vh - var(--nav-h)); background: var(--bg); }
.workbench {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 16px;
  padding: 16px 16px 32px;
  max-width: 1440px;
  margin: 0 auto;
}
.side-panel {
  background: #fff;
  border-radius: 12px;
  padding: 12px;
  height: fit-content;
  box-shadow: var(--shadow);
}
.side-btn {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: #374151;
  font-size: 14px;
  font-weight: 600;
  text-align: left;
}
.side-btn + .side-btn { margin-top: 4px; }
.side-btn:hover { background: var(--soft); color: var(--accent); }
.side-btn.active { background: var(--grad); color: #fff; }
.main-panel {
  min-width: 0;
  background: #fff;
  border-radius: 12px;
  padding: 16px 18px 20px;
  box-shadow: var(--shadow);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip {
  height: 28px;
  padding: 0 10px;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  background: #fff;
  color: #4b5563;
  font-size: 12px;
}
.chip.active { background: var(--grad); border-color: transparent; color: #fff; }
.note {
  margin: 12px 0;
  color: #9ca3af;
  font-size: 12px;
  line-height: 1.7;
}
.table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
table.data th, table.data td {
  padding: 12px 10px;
  text-align: center;
  border-bottom: 1px solid #f3f4f6;
}
table.data th {
  background: #f9fafb;
  color: #6b7280;
  font-weight: 500;
  font-size: 13px;
}
table.data td { color: #111; }
.rank { color: var(--accent); font-weight: 700; }
.hot { color: var(--accent); font-weight: 700; }
.avatar {
  width: 32px;
  height: 32px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}
.icon-btn {
  width: 28px;
  height: 28px;
  border: 0;
  background: transparent;
  color: #9ca3af;
}
.pager {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  color: #6b7280;
  font-size: 13px;
}
.pager button {
  min-width: 32px;
  height: 32px;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  background: #fff;
}
.pager button.active { background: var(--grad); border-color: transparent; color: #fff; }

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px 8px;
}
.page-head h2 { display: flex; align-items: center; gap: 10px; font-size: 20px; }
.page-head p { color: #9ca3af; font-size: 13px; margin-top: 4px; }
.empty {
  margin: 12px 24px 32px;
  min-height: 360px;
  display: grid;
  place-items: center;
  text-align: center;
  background: #fff;
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.empty .bubble {
  width: 72px;
  height: 72px;
  margin: 0 auto 12px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #f3f4f6;
  color: #9ca3af;
  font-size: 28px;
}
.prompt-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 16px;
  padding: 8px 24px 32px;
  max-width: 1440px;
  margin: 0 auto;
}
.cat-card {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
}
.cat-card h4 { font-size: 14px; margin-bottom: 8px; }
.cat-card .meta { color: #9ca3af; font-size: 12px; margin-bottom: 12px; }

/* membership */
.member-page { background: #f5fbff; }
.member-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - var(--nav-h));
}
.member-side {
  padding: 20px 16px;
  background: #fff;
  border-right: 1px solid #f3f4f6;
}
.member-side h4 { font-size: 14px; margin-bottom: 10px; }
.member-main { padding: 28px 28px 48px; }
.member-hero { text-align: center; }
.member-hero h2 { font-size: 32px; font-weight: 800; }
.member-hero h2 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.member-hero p { margin-top: 8px; color: #6b7280; }
.ticker {
  overflow: hidden;
  height: 36px;
  margin: 16px auto 8px;
  max-width: 520px;
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.ticker-track {
  display: flex;
  gap: 28px;
  width: max-content;
  animation: ticker 22s linear infinite;
  color: #6b7280;
  font-size: 13px;
}
@keyframes ticker { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.plans {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 28px;
}
.plan {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(15, 23, 42, .08);
}
.plan-head {
  padding: 22px 18px 16px;
  color: #fff;
  text-align: center;
}
.plan.p1 .plan-head { background: linear-gradient(180deg, #d4f2fc, #a8e0f8); color: #1578b0; }
.plan.p2 .plan-head { background: linear-gradient(180deg, #b9e9fb, #7ed4f6); }
.plan.p3 .plan-head { background: linear-gradient(180deg, #8fd9f8, #5ec8f2); }
.plan.p4 .plan-head { background: linear-gradient(180deg, #6ecdf4, #3bb8ea); }
.plan-head .title { display: flex; align-items: center; justify-content: center; gap: 6px; font-size: 18px; font-weight: 800; }
.plan-head .desc { margin-top: 6px; font-size: 12px; opacity: .92; }
.price { margin-top: 10px; font-size: 40px; font-weight: 800; line-height: 1; }
.price small { font-size: 13px; font-weight: 500; }
.old { margin-top: 4px; font-size: 12px; text-decoration: line-through; opacity: .85; }
.plan-body { padding: 16px 18px 20px; }
.plan-body li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 0;
  color: #4b5563;
  font-size: 13px;
  list-style: none;
}
.plan-body li .tag { margin-left: auto; }
.plan-body li::before {
  content: "✓";
  margin-right: 2px;
  font-weight: 700;
}
.plan.p1 .plan-body li::before { color: #8fd9f8; }
.plan.p2 .plan-body li::before { color: #5ec8f2; }
.plan.p3 .plan-body li::before { color: #3bb8ea; }
.plan.p4 .plan-body li::before { color: #2aa6db; }
.plan-body ul { margin: 0; padding: 0; }
.tag {
  height: 20px;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--accent);
  font-size: 11px;
  line-height: 20px;
}
.plan .buy {
  width: 100%;
  height: 40px;
  margin-top: 8px;
  border: 0;
  border-radius: 10px;
  color: #fff;
  font-weight: 700;
}
.plan.p1 .buy { background: linear-gradient(135deg, #d4f2fc, #a8e0f8); color: #1578b0; }
.plan.p2 .buy { background: linear-gradient(135deg, #b9e9fb, #7ed4f6); color: #1578b0; }
.plan.p3 .buy { background: linear-gradient(135deg, #8fd9f8, #5ec8f2); }
.plan.p4 .buy { background: linear-gradient(135deg, #6ecdf4, #3bb8ea); }
.hot-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  background: #fff;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  line-height: 22px;
}
.legal {
  margin-top: 22px;
  color: #6b7280;
  font-size: 13px;
  text-align: center;
  line-height: 1.8;
}

/* contact */
.contact-hero {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 40px;
  padding: 48px 8vw 56px;
  color: #fff;
  background:
    radial-gradient(ellipse at 18% 0%, rgba(255,255,255,.18), transparent 42%),
    var(--grad-deep);
}
.contact-hero h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; line-height: 1.25; max-width: 560px; }
.contact-hero .lead { margin: 16px 0 24px; max-width: 520px; opacity: .95; line-height: 1.7; }
.mini-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 560px; }
.mini-card {
  padding: 16px;
  border-radius: 12px;
  background: rgba(255,255,255,.14);
  backdrop-filter: blur(8px);
  font-size: 13px;
}
.mini-card b { display: block; margin: 6px 0 4px; }
.contact-card {
  background: #fff;
  color: #111;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 20px 50px rgba(0,0,0,.12);
}
.contact-card .who { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
.who .ava {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--grad);
  color: #fff;
}
.qr-frame {
  padding: 16px;
  border-radius: 12px;
  background: #fff;
  display: grid;
  place-items: center;
}
.contact-card .btn-cta { width: 100%; margin-top: 8px; height: 42px; font-size: 15px; }
.contact-bottom { padding: 28px 8vw 48px; background: var(--bg); }
.help-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.help-card {
  padding: 22px;
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
}
.help-card h3 { margin: 12px 0 6px; }
.help-card p { color: #6b7280; font-size: 14px; }
.tip-bar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft);
  color: var(--ink);
  font-size: 13px;
}

/* tutorial */
.tutorial-page { background: var(--bg); }
.tut-layout {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 12px;
  padding: 20px 20px 48px;
  max-width: 1180px;
  margin: 0 auto;
}
.tut-side .btn-cta { width: 100%; height: 40px; font-size: 14px; padding: 0 10px; }
.tut-head { text-align: center; margin-bottom: 18px; }
.tut-head h2 { font-size: 28px; font-weight: 800; }
.tut-head p { color: #9ca3af; margin-top: 6px; }
.player {
  height: 360px;
  border-radius: 16px;
  background: #111;
  display: grid;
  place-items: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.player .play {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 0;
  background: rgba(255,255,255,.18);
  color: #fff;
  font-size: 28px;
}
.player .bar {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  background: linear-gradient(transparent, rgba(0,0,0,.6));
  color: #ddd;
  font-size: 12px;
}
.tut-mini {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 18px 0 28px;
}
.tut-mini .item {
  padding: 16px;
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--shadow);
  text-align: center;
}
.tut-mini h4 { margin-top: 8px; font-size: 14px; }
.tut-mini p { color: #9ca3af; font-size: 12px; margin-top: 4px; }
.step-card {
  margin-bottom: 16px;
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.step-h {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--soft);
  font-weight: 700;
}
.num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
}
.step-b { padding: 16px 18px 18px; color: #4b5563; font-size: 14px; line-height: 1.8; }
.step-b ol { padding-left: 18px; }
.warn {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--soft);
  color: var(--ink);
  font-size: 13px;
}
.faq-item { padding: 8px 0; }
.faq-item b { color: var(--accent); }

.toast {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 2000;
  transform: translateX(-50%);
  padding: 10px 16px;
  border-radius: 999px;
  background: #111827;
  color: #fff;
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(4px); }

.mobile-drawer {
  display: none;
  position: fixed;
  inset: var(--nav-h) 0 0 0;
  z-index: 90;
  background: rgba(15, 23, 42, .28);
}
.mobile-drawer .panel {
  width: min(320px, 100%);
  height: 100%;
  margin-left: auto;
  background: #fff;
  padding: 16px;
  display: grid;
  gap: 8px;
  align-content: start;
}

@media (max-width: 1180px) {
  .nav-links { display: none; }
  .menu-btn { display: inline-grid; place-items: center; }
  .plans, .track-grid, .feature-grid, .why-grid, .help-grid, .tut-mini { grid-template-columns: 1fr 1fr; }
  .member-grid, .workbench, .prompt-layout, .contact-hero, .auth-page, .tut-layout { grid-template-columns: 1fr; }
  .auth-left { display: none; }
  .auth-right { padding: 24px 16px 40px; }
  .contact-hero, .contact-bottom { padding-left: 20px; padding-right: 20px; }
}
@media (max-width: 720px) {
  .wrap { width: min(100% - 28px, var(--max)); }
  .feature-grid, .track-grid, .why-grid, .why-page, .plans, .help-grid, .tut-mini, .mini-cards { grid-template-columns: 1fr; }
  .hero-slide { padding: 48px 40px 64px; }
  .hero-brand img { width: 56px; height: 56px; }
  .brand small { display: none; }
  .menu-btn { display: none; }
  .nav-actions .btn { height: 32px; padding: 0 12px; font-size: 12px; }
  .player { height: 200px; }
}