/* ========== 全站基础与通用组件 ========== */
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(124,92,255,0.18), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(255,78,205,0.14), transparent 60%),
    radial-gradient(800px 600px at 50% 120%, rgba(74,217,255,0.10), transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* 网格背景层（fixed） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

.container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

/* ========== Typography ========== */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.02em; }
.h-display { font-family: var(--font-display); }
.text-grad {
  background: var(--grad-cosmic);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section { padding: var(--space-9) 0; }
.section-title { text-align: center; margin-bottom: var(--space-7); }
.section-title h2 { font-size: clamp(28px, 4vw, 44px); }
.section-title p { color: var(--color-text-soft); margin-top: var(--space-3); font-size: 16px; }
.eyebrow {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(124,92,255,0.12);
  color: var(--color-primary-2);
  border: 1px solid rgba(124,92,255,0.35);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  transition: all var(--t-base);
  white-space: nowrap;
}
.btn:hover { background: var(--color-surface-hover); transform: translateY(-1px); border-color: var(--color-border-strong); }

.btn-primary {
  background: var(--grad-primary);
  border: none;
  color: #0a0820;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { box-shadow: 0 0 32px rgba(124,92,255,0.7); transform: translateY(-2px); }

.btn-accent {
  background: var(--grad-accent);
  border: none;
  color: #fff;
  box-shadow: var(--shadow-glow-pink);
}
.btn-accent:hover { box-shadow: 0 0 32px rgba(255,78,205,0.75); transform: translateY(-2px); }

.btn-ghost { background: transparent; border-color: var(--color-border-strong); }
.btn-sm { padding: 8px 14px; font-size: 13px; }

/* ========== Navbar ========== */
.nav {
  position: sticky; top: 0; z-index: var(--z-nav);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(7,6,15,0.65);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.06em;
}
.logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--grad-cosmic);
  display: grid; place-items: center;
  color: #0a0820; font-weight: 900;
  box-shadow: var(--shadow-glow);
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--color-text-soft);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-links a:hover, .nav-links a.active {
  color: #fff;
  background: var(--color-surface-hover);
}
.nav-cta { display: flex; align-items: center; gap: 10px; }
.lang-switch {
  display: inline-flex; padding: 4px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
}
.lang-switch button {
  padding: 4px 10px; font-size: 12px; border-radius: var(--radius-pill);
  color: var(--color-text-soft);
}
.lang-switch button.active { background: var(--grad-primary); color: #0a0820; font-weight: 700; }

.nav-toggle { display: none; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--color-border); }
.nav-toggle span { display: block; width: 18px; height: 2px; background: #fff; margin: 4px auto; transition: var(--t-base); }

@media (max-width: 960px) {
  .nav-links {
    position: absolute; top: 70px; left: 0; right: 0;
    flex-direction: column; align-items: stretch;
    background: rgba(15,13,34,0.95);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px;
    gap: 4px;
    transform: translateY(-10px); opacity: 0; pointer-events: none;
    transition: var(--t-base);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-toggle { display: block; }
  .nav-cta .btn { display: none; }
}

/* ========== Footer ========== */
.footer {
  margin-top: var(--space-9);
  border-top: 1px solid var(--color-border);
  background: linear-gradient(180deg, transparent, rgba(124,92,255,0.06));
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-7);
  padding: var(--space-8) 0 var(--space-6);
}
.footer h4 { font-size: 14px; letter-spacing: 0.16em; color: var(--color-text); margin-bottom: var(--space-4); text-transform: uppercase; }
.footer ul li { margin-bottom: 10px; }
.footer a { color: var(--color-text-soft); transition: color var(--t-fast); font-size: 14px; }
.footer a:hover { color: var(--color-primary-2); }
.footer-brand p { color: var(--color-text-soft); margin-top: var(--space-3); font-size: 14px; max-width: 360px; }
.socials { display: flex; gap: 10px; margin-top: var(--space-4); }
.social-icon {
  width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--color-surface); border: 1px solid var(--color-border);
  transition: var(--t-base);
}
.social-icon:hover { background: var(--grad-primary); transform: translateY(-2px); border-color: transparent; }
.social-icon svg { width: 18px; height: 18px; }
.copyright {
  border-top: 1px solid var(--color-border);
  padding: 18px 0;
  text-align: center;
  color: var(--color-text-mute);
  font-size: 13px;
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ========== Cards ========== */
.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: var(--t-base);
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: rgba(124,92,255,0.5);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0;
  background: radial-gradient(400px at var(--x,50%) var(--y,50%), rgba(124,92,255,0.18), transparent 70%);
  transition: opacity var(--t-base);
}
.card:hover::after { opacity: 1; }

/* ========== Tag / Chip ========== */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(124,92,255,0.14);
  color: var(--color-primary-2);
  border: 1px solid rgba(124,92,255,0.32);
  font-size: 12px;
}
.tag.pink { background: rgba(255,78,205,0.14); color: #ffadea; border-color: rgba(255,78,205,0.32); }
.tag.cyan { background: rgba(74,217,255,0.14); color: #9ee9ff; border-color: rgba(74,217,255,0.32); }
.tag.gold { background: rgba(255,181,71,0.14); color: #ffd28a; border-color: rgba(255,181,71,0.32); }

/* ========== Filter Bar ========== */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-bottom: var(--space-6); justify-content: center;
}
.filter-chip {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-soft);
  font-size: 14px;
  transition: var(--t-base);
}
.filter-chip:hover { color: #fff; border-color: var(--color-border-strong); }
.filter-chip.active {
  background: var(--grad-primary); color: #0a0820;
  border-color: transparent; font-weight: 700;
  box-shadow: var(--shadow-glow);
}

/* ========== Toast ========== */
.toast-host {
  position: fixed; top: 90px; right: 24px; z-index: var(--z-toast);
  display: flex; flex-direction: column; gap: 10px;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  min-width: 240px; max-width: 360px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: rgba(22,20,46,0.95);
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
  font-size: 14px;
  animation: toastIn .35s cubic-bezier(.2,.8,.2,1);
}
.toast.success { border-color: rgba(46,230,168,0.5); }
.toast.error { border-color: rgba(255,91,110,0.5); }
.toast.info { border-color: rgba(124,92,255,0.5); }
@keyframes toastIn { from { transform: translateX(120%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ========== Modal ========== */
.modal-mask {
  position: fixed; inset: 0; z-index: var(--z-modal);
  background: rgba(3,2,12,0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none; align-items: center; justify-content: center;
  padding: 24px;
}
.modal-mask.open { display: flex; animation: maskIn .25s ease; }
@keyframes maskIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  width: min(900px, 100%);
  max-height: 90vh; overflow: auto;
  background: linear-gradient(180deg, #16142e, #0f0d22);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
  animation: modalIn .35s cubic-bezier(.2,.8,.2,1);
}
@keyframes modalIn { from { transform: translateY(20px) scale(.98); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: grid; place-items: center;
  color: #fff; font-size: 18px;
}
.modal-close:hover { background: var(--color-surface-hover); }

/* ========== Forms ========== */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-4); }
.field label { font-size: 13px; color: var(--color-text-soft); }
.field label .req { color: var(--color-accent); margin-left: 3px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 14px;
  transition: var(--t-fast);
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124,92,255,0.18);
}
.field textarea { min-height: 110px; resize: vertical; }
.field.error input,
.field.error select,
.field.error textarea,
.field input.invalid,
.field select.invalid,
.field textarea.invalid { border-color: var(--color-danger); }
.field input.invalid:focus,
.field select.invalid:focus,
.field textarea.invalid:focus {
  box-shadow: 0 0 0 3px rgba(255,91,110,0.18);
}
.field select option {
  background: var(--color-bg-elev);
  color: var(--color-text);
}
.field .err-msg { color: var(--color-danger); font-size: 12px; min-height: 16px; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 600px) { .field-grid { grid-template-columns: 1fr; } }

/* ========== Back to top ========== */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--grad-primary); color: #0a0820;
  display: grid; place-items: center;
  border: none;
  box-shadow: var(--shadow-glow);
  z-index: 99;
  transform: translateY(20px); opacity: 0; pointer-events: none;
  transition: var(--t-base);
}
.back-to-top.show { transform: translateY(0); opacity: 1; pointer-events: auto; }

/* ========== Reveal animations ========== */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--t-base), transform .7s var(--t-base); }
[data-reveal].on { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ========== Page header (sub-pages) ========== */
.page-hero {
  padding: var(--space-9) 0 var(--space-7);
  text-align: center;
  position: relative;
}
.page-hero h1 { font-size: clamp(32px, 5vw, 56px); }
.page-hero p { color: var(--color-text-soft); margin-top: var(--space-3); max-width: 720px; margin-inline: auto; }