/* ============ 设计令牌 & 基础 ============ */

:root {
  /* 表面（浅色主题） */
  --bg: #eef2f8;
  --bg-1: #ffffff;
  --bg-2: #f4f7fb;
  --bg-3: #e7eef6;
  --bg-tint: rgba(43, 95, 166, 0.045); /* 品牌蓝极淡水洗面，用于面板/卡片底 */
  --line: rgba(15, 31, 51, 0.10);
  --line-2: rgba(15, 31, 51, 0.16);
  --hi: rgba(255, 255, 255, 0.7);

  /* 文字（深色） */
  --fg: #0f1f33;
  --fg-2: #44566b;
  --fg-3: #6b7d90;
  --fg-4: #94a3b4;

  /* 强调色：深海蓝（品牌主色，源自 logo） */
  --acc: #2b5fa6;
  --acc-2: #1c4a8a;
  --acc-bright: #5a8de0;
  --gold: #b07d28;            /* 金色装饰/边框/图标（大色块或描边用） */
  --gold-2: #7a5314;         /* 深金：浅底上的小号金色文字，保证 WCAG AA 对比度 */
  --gold-soft: rgba(176, 125, 40, 0.16);

  --acc-dim: rgba(43, 95, 166, 0.10);
  --acc-line: rgba(43, 95, 166, 0.40);
  --acc-glow: rgba(43, 95, 166, 0.30);

  /* 渐变：深海蓝主 + 天空蓝辅（呼应 logo 弧线/Z字） */
  --grad-acc: linear-gradient(135deg, #1c4a8a 0%, #2b5fa6 38%, #5a8de0 100%);
  /* 英雄深蓝蒙版：近黑藏蓝 → 品牌蓝提亮，比纯暗更有"品牌感" */
  --grad-deep: linear-gradient(165deg, #051026 0%, #0a2247 52%, #103a6e 100%);

  --radius: 14px;
  --radius-lg: 22px;
  --maxw: 1360px;
  --pad: clamp(20px, 5vw, 64px);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-elastic: cubic-bezier(0.34, 1.4, 0.64, 1);

  --font: "Outfit", "Geist", "Satoshi", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans CN", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 全局背景纹理：细网格 + 顶部辉光 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 120% 80% at 50% 0%, #000 20%, transparent 78%);
  opacity: 0.55;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

::selection {
  background: var(--acc);
  color: #eaf2ff;
}

:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: #c2cedb;
  border-radius: 99px;
  border: 2px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover {
  background: #a7b6c6;
}

/* ============ 布局工具 ============ */

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
  position: relative;
  z-index: 1;
}

.section {
  position: relative;
  padding-block: clamp(72px, 10vw, 148px);
}

.section + .section {
  border-top: 1px solid var(--line);
}

/* ============ 通用文字组件 ============ */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--acc);
  margin-bottom: 20px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--acc);
  opacity: 0.7;
}

.h-sec {
  font-size: clamp(29px, 4.4vw, 52px);
  font-weight: 700;
  letter-spacing: -0.035em;
  max-width: 20ch;
  text-wrap: balance;
}

.h-sub {
  font-size: clamp(17px, 2vw, 21px);
  color: var(--acc);
  font-weight: 500;
  margin-top: 14px;
  letter-spacing: -0.01em;
}

.lede {
  color: var(--fg-2);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  max-width: 62ch;
  margin-top: 20px;
}

.sec-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(40px, 5vw, 68px);
}

/* ============ 按钮 ============ */

.btn {
  --btn-bg: var(--acc);
  --btn-fg: #eaf2ff;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.35s var(--ease-out), background 0.25s, box-shadow 0.35s, border-color 0.25s;
  will-change: transform;
}

.btn:hover {
  box-shadow: 0 10px 34px -10px var(--acc-glow);
}

.btn:active {
  transform: scale(0.97);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--fg);
  border-color: var(--line-2);
  backdrop-filter: blur(8px);
}

.btn--ghost:hover {
  border-color: var(--acc-line);
  background: var(--acc-dim);
  color: var(--fg);
  box-shadow: none;
}

.btn--sm {
  padding: 10px 18px;
  font-size: 13.5px;
}

.btn .arw {
  transition: transform 0.35s var(--ease-out);
}

.btn:hover .arw {
  transform: translateX(4px);
}

/* 文字链接 */
.tlink {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--acc);
  font-size: 14px;
  font-weight: 500;
}

.tlink svg {
  transition: transform 0.35s var(--ease-out);
}

.tlink:hover svg {
  transform: translateX(4px);
}

/* ============ 标签 ============ */

.chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-size: 12px;
  color: var(--fg-2);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.chip--acc {
  border-color: var(--acc-line);
  color: var(--acc);
  background: var(--acc-dim);
}

/* ============ 滚动进场动画 ============ */

.rv {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.85s var(--ease-out), transform 0.85s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 75ms);
}

.rv.in {
  opacity: 1;
  transform: none;
}

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

/* 骨架屏 */
.skl {
  position: relative;
  overflow: hidden;
  background: var(--bg-2);
  border-radius: 8px;
}

.skl::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(15, 31, 51, 0.06), transparent);
  animation: shimmer 1.4s infinite;
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}