:root {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* ===== 浅色 + 分层 + 更丰富（但低饱和，不霓虹） ===== */
  color: #0b1220;
  background-color: #eef2f7;

  /* 丰富的“点缀色”调色盘：都偏灰、低饱和 */
  --ink: #0b1220;
  --muted: #4f5b6a;

  --accent: #243149;        /* ink-blue */
  --accent-2: #3b4b66;

  --tint-blue:  rgba(35, 98, 194, 0.12); /* soft blue */
  --tint-teal:  rgba(22, 144, 149, 0.10); /* soft teal */
  --tint-amber: rgba(194, 129, 54, 0.10); /* soft amber */
  --tint-rose:  rgba(176, 74, 96, 0.08);  /* soft rose */

  /* 背景分层（略深一点） */
  --bg-0: #eef2f7;
  --bg-1: #e6ecf4;
  --bg-2: #dde5ef;

  /* 表面层 */
  --surface: rgba(255, 255, 255, 0.88);
  --surface-2: rgba(255, 255, 255, 0.76);
  --border: rgba(11, 18, 32, 0.12);

  /* 强调渐变：改成“墨蓝→灰蓝”，不走炫彩 */
  --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));

  /* 阴影：真实 UI */
  --shadow-sm: 0 10px 22px rgba(2, 6, 23, 0.08);
  --shadow-md: 0 18px 44px rgba(2, 6, 23, 0.09);
  --shadow-lg: 0 26px 70px rgba(2, 6, 23, 0.11);

  --radius-lg: 30px;
  --radius-md: 20px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg-0);
  color: var(--ink);
}

body {
  position: relative;
  min-height: 100vh;
  line-height: 1.6;

  /* 分层结构：带状层级（比纯白更有结构） */
  background:
    radial-gradient(1100px 700px at 50% -10%, rgba(255, 255, 255, 0.60), transparent 62%),
    linear-gradient(
      180deg,
      var(--bg-0) 0%,
      var(--bg-1) 26%,
      var(--bg-0) 56%,
      var(--bg-2) 80%,
      var(--bg-0) 100%
    );
}

/* ===== 丰富但克制的“色彩雾块”（关键：透明度低 + 范围大 + blur） ===== */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: -22%;
  pointer-events: none;
  z-index: -1;
  filter: blur(18px);
}

body::before {
  background:
    radial-gradient(circle at 18% 22%, var(--tint-blue), transparent 56%),
    radial-gradient(circle at 82% 18%, var(--tint-teal), transparent 60%),
    radial-gradient(circle at 65% 82%, var(--tint-amber), transparent 62%);
}

body::after {
  /* 额外一点玫瑰色，让整体更“丰富”，但透明度很低 */
  background:
    radial-gradient(circle at 55% 45%, var(--tint-rose), transparent 62%);
  filter: blur(22px);
}

/* ================= Hero ================= */
.hero {
  padding: 4rem 1.5rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
  color: #ffffff;
  display: inline-block;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  background: var(--gradient);
  box-shadow: 0 10px 22px rgba(2, 6, 23, 0.12);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  margin-bottom: 1rem;
}

.hero__lead {
  color: var(--muted);
  font-size: 1.1rem;
}

.hero__meta {
  color: rgba(11, 18, 32, 0.70);
  margin: 1rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

/* ================= Buttons ================= */
.btn {
  border: 1px solid var(--border);
  padding: 0.75rem 1.75rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.btn.primary {
  background: var(--gradient);
  color: #fff;
  border: none;
  box-shadow: 0 16px 34px rgba(2, 6, 23, 0.16);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(2, 6, 23, 0.12);
}

/* ================= Stats ================= */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1rem;
}

.stats article {
  background: var(--surface);
  border-radius: 24px;
  padding: 1.25rem;
  text-align: center;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

.stats h3 {
  font-size: 2rem;
  margin: 0 0 0.3rem;
  color: var(--accent);
}

/* ================= Tabs ================= */
.tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding: 1rem 1.5rem 0;
  flex-wrap: wrap;
}

.tab {
  border: 1px solid var(--border);
  background: var(--surface-2);
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  color: rgba(11, 18, 32, 0.66);
  transition: background 0.2s ease, transform 0.2s ease;
}

.tab:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.92);
}

.tab.active {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(11, 18, 32, 0.16);
  color: var(--ink);
}

.tab-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
  color: rgba(11, 18, 32, 0.80);
}

.tab-content.hidden { display: none; }

/* ================= Cards ================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

/* ================= Panel ================= */
.panel {
  max-width: 1000px;
  margin: 2rem auto 0;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.90);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.panel table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.panel th,
.panel td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid rgba(11, 18, 32, 0.10);
}

.panel th {
  color: rgba(11, 18, 32, 0.82);
  font-weight: 600;
}

.panel td {
  color: rgba(11, 18, 32, 0.74);
}

.panel ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

footer {
  text-align: center;
  padding: 3rem 1rem;
  color: rgba(11, 18, 32, 0.58);
}

@media (max-width: 600px) {
  .hero__meta { font-size: 0.9rem; }
}