/* ==================== 设计变量与基础重置 ==================== */
:root {
  --color-primary-dark: #0b3d2e;
  --color-primary: #147c5a;
  --color-accent: #a3e635;
  --color-bg: #f7faf8;
  --color-surface: #ffffff;
  --color-text: #1a2b25;
  --color-text-muted: #5c7368;
  --color-border: rgba(11, 61, 46, 0.08);
  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4.5rem;
  --spacing-xl: 7rem;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --shadow-card: 0 6px 20px rgba(11, 61, 46, 0.06);
  --shadow-hover: 0 10px 28px rgba(11, 61, 46, 0.12);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: none; transition: var(--transition-base); }
a:hover { color: var(--color-accent); }
a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 2px; }
ul, ol { list-style: none; }

/* ==================== 排版系统 ==================== */
h1, h2, h3, h4 { line-height: 1.25; text-wrap: balance; margin-bottom: var(--spacing-sm); }
h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.25rem); font-weight: 800; letter-spacing: -0.025em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; margin-top: var(--spacing-lg); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); font-weight: 600; }
p { margin-bottom: 1rem; color: var(--color-text-muted); }
strong { font-weight: 600; color: var(--color-text); }

/* ==================== 布局组件 ==================== */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-sm); }
section { padding: var(--spacing-lg) 0; position: relative; }
.grid { display: grid; gap: var(--spacing-md); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.flex-center { display: flex; align-items: center; justify-content: center; }
.text-center { text-align: center; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }

/* ==================== 导航与页脚 ==================== */
header { background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 1rem var(--spacing-sm); max-width: 1200px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 0.75rem; }
.brand img { width: 40px; height: 40px; object-fit: contain; }
.brand-name { font-weight: 700; font-size: 1.25rem; color: var(--color-text); }
nav ul { display: flex; gap: 1.75rem; flex-wrap: wrap; }
nav a { font-weight: 500; color: var(--color-text-muted); font-size: 0.95rem; }
nav a[aria-current="page"], nav a:hover { color: var(--color-primary); }

footer { background: var(--color-primary-dark); color: #e8efe9; padding: var(--spacing-xl) 0 var(--spacing-md); margin-top: var(--spacing-lg); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--spacing-md); max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-sm); }
footer h4 { color: #fff; margin-bottom: var(--spacing-sm); font-size: 1.1rem; }
footer p, footer a { color: rgba(255, 255, 255, 0.75); font-size: 0.9rem; line-height: 1.6; }
footer a:hover { color: var(--color-accent); }
.footer-bottom { max-width: 1200px; margin: var(--spacing-md) auto 0; padding: 0 var(--spacing-sm); border-top: 1px solid rgba(255,255,255,0.1); text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.5); }

/* ==================== 按钮与交互 ==================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.85rem 1.75rem; border-radius: var(--radius-full); font-weight: 600; cursor: pointer;
  transition: var(--transition-base); border: none; font-size: 1rem; user-select: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #2cb87d); color: #fff;
  box-shadow: 0 4px 14px rgba(20, 124, 90, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(20, 124, 90, 0.45); }
.btn-outline { background: transparent; border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }

/* ==================== 卡片与表格 ==================== */
.card { background: var(--color-surface); border-radius: var(--radius-md); padding: var(--spacing-md); box-shadow: var(--shadow-card); transition: var(--transition-base); border: 1px solid var(--color-border); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(163, 230, 53, 0.3); }
.card-meta { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: 0.6rem; display: flex; align-items: center; gap: 0.5rem; }
.table-wrapper { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--color-border); background: var(--color-surface); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--color-border); vertical-align: top; }
th { background: rgba(20, 124, 90, 0.06); font-weight: 600; }
tr:last-child td { border-bottom: none; }

/* ==================== FAQ 组件 ==================== */
details { background: var(--color-surface); border-radius: var(--radius-sm); margin-bottom: 0.75rem; border: 1px solid var(--color-border); overflow: hidden; }
summary { padding: 1.1rem 1.25rem; cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; transition: background var(--transition-base); }
summary:hover { background: rgba(20, 124, 90, 0.04); }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 1.3rem; font-weight: 400; color: var(--color-primary); transition: transform 0.2s; }
details[open] summary::after { transform: rotate(45deg); }
details > div { padding: 0 1.25rem 1.1rem; color: var(--color-text-muted); line-height: 1.65; }

/* ==================== 首屏与背景 ==================== */
.hero-section { min-height: 92vh; display: flex; align-items: center; position: relative; overflow: hidden; background: radial-gradient(circle at 70% 30%, rgba(163, 230, 53, 0.12) 0%, transparent 60%); }
.hero-content { position: relative; z-index: 2; max-width: 620px; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: var(--spacing-md); }
.hero-badge { display: inline-flex; align-items: center; gap: 0.5rem; background: rgba(20, 124, 90, 0.08); padding: 0.4rem 0.9rem; border-radius: var(--radius-full); font-size: 0.85rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--spacing-sm); }
.hero-gradient-text {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), var(--color-accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ==================== SVG 动效系统 ==================== */
.svg-anim-container { position: relative; width: 100%; max-width: 500px; margin: 0 auto; }
.geo-shape { transform-box: fill-box; transform-origin: center; }
.anim-spin-slow { animation: spin-cw 28s linear infinite; }
.anim-spin-fast { animation: spin-ccw 22s linear infinite; }
.anim-float-y { animation: float-vertical 6s ease-in-out infinite; }
.anim-draw-path { stroke-dasharray: 1; stroke-dashoffset: 0; animation: draw-progress 3.5s ease forwards; }

@keyframes spin-cw { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes spin-ccw { from { transform: rotate(360deg); } to { transform: rotate(0deg); } }
@keyframes float-vertical { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
@keyframes draw-progress { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .anim-spin-slow, .anim-spin-fast, .anim-float-y, .anim-draw-path { animation: none; }
}