/* ==========================================================================
   Canton214nb — 站点样式
   纯手写 CSS，无框架、无外部字体、无构建步骤。
   想换配色：只改下面 :root 里的变量即可。
   ========================================================================== */

:root {
  --bg:        #0b1020;
  --bg-soft:   #111834;
  --surface:   #141c3a;
  --border:    rgba(255, 255, 255, .10);
  --text:      #e8ecf8;
  --text-dim:  #9aa6c7;
  --accent:    #5b8cff;
  --accent-2:  #35e0c8;
  --shadow:    0 10px 40px rgba(0, 0, 0, .35);
  --radius:    16px;
  --wrap:      1080px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

[data-theme="light"] {
  --bg:       #f7f9fc;
  --bg-soft:  #ffffff;
  --surface:  #ffffff;
  --border:   rgba(16, 24, 48, .12);
  --text:     #131a2e;
  --text-dim: #5a6788;
  --accent:   #2f5fe0;
  --accent-2: #0aa892;
  --shadow:   0 10px 34px rgba(16, 24, 48, .10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 .6em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 6vw, 3.6rem); }
h3 { font-size: 1.1rem; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.wrap.narrow { max-width: 760px; }
.muted { color: var(--text-dim); }
.small { font-size: .88rem; }

/* 跳到主内容 ------------------------------------------------------------- */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* 顶栏 ------------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(150%) blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, background .2s ease;
}
.site-header.is-stuck { border-bottom-color: var(--border); }

.header-inner {
  display: flex; align-items: center; gap: 18px;
  min-height: 64px;
}

.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); font-weight: 700; letter-spacing: -.01em;
  text-decoration: none; margin-right: auto;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center;
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06101f; font-weight: 800; font-size: 1rem;
}
.brand-name { font-size: 1.02rem; }

.nav { display: flex; gap: 22px; }
.nav a { color: var(--text-dim); font-size: .95rem; }
.nav a:hover { color: var(--text); text-decoration: none; }

.header-actions { display: flex; gap: 8px; }

.icon-btn {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent; color: var(--text); cursor: pointer;
  transition: background .15s ease, border-color .15s ease;
}
.icon-btn:hover { background: var(--surface); }
.icon-btn svg {
  width: 19px; height: 19px; fill: none;
  stroke: currentColor; stroke-width: 1.7;
  stroke-linecap: round; stroke-linejoin: round;
}
.i-moon { display: none; }
[data-theme="dark"] .i-sun { display: none; }
[data-theme="dark"] .i-moon { display: block; }

.burger { display: none; }

/* Hero ------------------------------------------------------------------- */
.hero { position: relative; padding: clamp(64px, 12vw, 130px) 0 clamp(48px, 8vw, 96px); overflow: hidden; }
.hero-inner { position: relative; z-index: 1; max-width: 780px; }

.hero-glow {
  position: absolute; inset: -30% -20% auto -20%; height: 620px;
  background:
    radial-gradient(45% 55% at 25% 45%, color-mix(in srgb, var(--accent) 40%, transparent), transparent 70%),
    radial-gradient(40% 50% at 70% 35%, color-mix(in srgb, var(--accent-2) 30%, transparent), transparent 70%);
  filter: blur(30px); opacity: .55; pointer-events: none;
  animation: drift 18s ease-in-out infinite alternate;
}
@keyframes drift { from { transform: translate3d(-2%, -1%, 0) scale(1); } to { transform: translate3d(3%, 2%, 0) scale(1.08); } }

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .85rem; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 14px; margin: 0 0 22px;
  background: color-mix(in srgb, var(--surface) 60%, transparent);
}
.dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent-2) 70%, transparent);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent-2) 60%, transparent); }
  70%  { box-shadow: 0 0 0 9px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.lead { font-size: clamp(1.02rem, 2.2vw, 1.2rem); color: var(--text-dim); max-width: 62ch; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 22px; border-radius: 12px;
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
  border: 1px solid transparent; transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06101f; box-shadow: 0 8px 26px color-mix(in srgb, var(--accent) 35%, transparent);
}
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--surface); }

.hero-note { margin-top: 26px; font-size: .86rem; color: var(--text-dim); }

/* 通用 section ------------------------------------------------------------ */
.section { padding: clamp(56px, 9vw, 96px) 0; }
.section-title { font-size: clamp(1.5rem, 3.4vw, 2rem); }
.section-sub { color: var(--text-dim); margin-top: -0.4em; }

.grid {
  display: grid; gap: 18px; margin-top: 34px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.card p { color: var(--text-dim); margin: 0; font-size: .95rem; }

.card-icon {
  display: grid; place-items: center;
  width: 42px; height: 42px; border-radius: 12px;
  margin-bottom: 14px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.card-icon svg {
  width: 21px; height: 21px; fill: none; stroke: var(--accent-2);
  stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
}

/* 数据条 ----------------------------------------------------------------- */
.stats-band { background: color-mix(in srgb, var(--bg-soft) 90%, transparent); border-block: 1px solid var(--border); }
.stats {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  text-align: center;
}
.stats strong {
  display: block; font-size: clamp(1.4rem, 4vw, 2rem);
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stats span { color: var(--text-dim); font-size: .88rem; }

/* 联系 ------------------------------------------------------------------- */
.contact-grid {
  display: grid; gap: 28px; margin-top: 30px;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
}
.contact-side { border-left: 1px solid var(--border); padding-left: 28px; }
.contact-side p { color: var(--text-dim); }

.form { display: grid; gap: 16px; }
.field { display: grid; gap: 7px; }
.field label { font-size: .9rem; font-weight: 600; }

input, textarea {
  width: 100%; font: inherit; color: var(--text);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  border: 1px solid var(--border); border-radius: 11px;
  padding: 11px 13px; resize: vertical;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input::placeholder, textarea::placeholder { color: color-mix(in srgb, var(--text-dim) 80%, transparent); }
input:focus, textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: #ff6b6b; }

.err { margin: 0; font-size: .83rem; color: #ff8b8b; }
[data-theme="light"] .err { color: #c0392b; }

.form-status { margin: 0; font-size: .9rem; color: var(--accent-2); min-height: 1.4em; }

/* 页脚 ------------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); padding: 30px 0; margin-top: 40px; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 12px;
  align-items: center; justify-content: space-between;
  color: var(--text-dim); font-size: .9rem;
}
.footer-inner p { margin: 0; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--text); }

/* 404 ------------------------------------------------------------------- */
.center-page { min-height: 100vh; display: grid; place-items: center; text-align: center; padding: 24px; }

/* 响应式 ----------------------------------------------------------------- */
@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
  .contact-side { border-left: 0; border-top: 1px solid var(--border); padding: 24px 0 0; }
}

@media (max-width: 720px) {
  .burger { display: grid; }
  .nav {
    position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 6px 20px 14px;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 1rem; }
  .nav a:last-child { border-bottom: 0; }
  .cta-row .btn { flex: 1 1 100%; }
}

/* 打印 ------------------------------------------------------------------- */
@media print {
  .site-header, .hero-glow, .cta-row, .form { display: none !important; }
  body { background: #fff; color: #000; }
}