/* =========================================================
   益治云 · 公益组织数字化管理平台 官网
   设计风格：极简轻量 / 政企公益风 / 深蓝+浅灰+白 / 少量公益青
   ========================================================= */

:root {
  /* 主色：深蓝（政企稳重） */
  --c-primary: #1f3a5f;
  --c-primary-dark: #15293f;
  --c-primary-light: #2e5a8a;
  --c-accent: #2b9e8f;        /* 公益青 · 少量点缀 */
  --c-accent-soft: #e8f4f2;

  /* 中性色：浅灰 + 白 */
  --c-bg: #f5f7fa;
  --c-card: #ffffff;
  --c-border: #e4e9f0;
  --c-text: #33415c;
  --c-text-2: #6b7a90;
  --c-text-3: #9aa8bb;
  --c-line: #edf1f6;

  /* 形状 */
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 14px rgba(31, 58, 95, 0.08);
  --shadow-lg: 0 10px 34px rgba(31, 58, 95, 0.12);

  /* 布局 */
  --container: 1160px;
  --header-h: 72px;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--c-line);
}
.site-header .header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand .logo {
  width: 40px; height: 40px; display: block; flex: none;
  object-fit: contain;
}
.brand .logo-text { font-size: 19px; font-weight: 700; color: var(--c-primary-dark); letter-spacing: 1px; }
.brand .logo-sub { display: block; font-size: 11px; color: var(--c-text-3); font-weight: 400; letter-spacing: 2px; }

.main-nav ul { display: flex; gap: 34px; }
.main-nav a {
  display: inline-block; padding: 6px 0; font-size: 15px; color: var(--c-text);
  border-bottom: 2px solid transparent; transition: color 0.2s;
}
.main-nav a:hover, .main-nav a.active { color: var(--c-primary); border-bottom-color: var(--c-accent); }
.header-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none; width: 40px; height: 40px; border: none; background: none;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--c-primary); border-radius: 2px; transition: 0.25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 26px; border-radius: 8px; border: 1px solid transparent;
  font-size: 15px; font-weight: 500; line-height: 1.4;
  transition: all 0.2s ease;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-light); }
.btn-accent { background: var(--c-accent); color: #fff; }
.btn-accent:hover { background: #23897c; }
.btn-ghost { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn-ghost:hover { background: var(--c-primary); color: #fff; }
.btn-white { background: #fff; color: var(--c-primary); }
.btn-white:hover { background: #eef3f8; }
.btn-lg { padding: 14px 34px; font-size: 16px; }

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section.bg-white { background: var(--c-card); }
.section.bg-soft { background: var(--c-bg); }
.section.bg-primary {
  background: linear-gradient(160deg, var(--c-primary-dark) 0%, var(--c-primary) 60%, var(--c-primary-light) 100%);
  color: #fff;
}

.sec-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.sec-eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: 3px; color: var(--c-accent);
  margin-bottom: 12px; font-weight: 500;
}
.sec-title { font-size: 32px; font-weight: 700; color: var(--c-primary-dark); line-height: 1.35; }
.sec-desc { margin-top: 14px; font-size: 16px; color: var(--c-text-2); }
.bg-primary .sec-title { color: #fff; }
.bg-primary .sec-desc { color: rgba(255, 255, 255, 0.78); }
.bg-primary .sec-eyebrow { color: #7fd4c9; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--c-card); border-radius: var(--radius);
  border: 1px solid var(--c-border); padding: 30px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.card .icon-box {
  width: 52px; height: 52px; border-radius: 12px; margin-bottom: 18px;
  background: var(--c-accent-soft); color: var(--c-accent);
  display: flex; align-items: center; justify-content: center;
}
.card .icon-box svg { width: 26px; height: 26px; }
.card h3 { font-size: 18px; color: var(--c-primary-dark); font-weight: 600; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--c-text-2); }

/* ---------- 首屏 Hero ---------- */
.hero {
  background: linear-gradient(165deg, var(--c-primary-dark) 0%, var(--c-primary) 55%, var(--c-primary-light) 100%);
  color: #fff; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 460px; height: 460px;
  border-radius: 50%; background: radial-gradient(circle, rgba(43, 158, 143, 0.28) 0%, transparent 65%);
}
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; padding-top: 84px; padding-bottom: 84px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px; font-size: 13px;
  background: rgba(255, 255, 255, 0.1); border: 1px solid rgba(255, 255, 255, 0.22);
  margin-bottom: 22px; color: #dbe6f3;
}
.hero h1 { font-size: 44px; line-height: 1.28; font-weight: 700; letter-spacing: 1px; }
.hero h1 em { font-style: normal; color: #7fd4c9; }
.hero .hero-sub { margin-top: 20px; font-size: 17px; color: rgba(255, 255, 255, 0.82); max-width: 520px; }
.hero .hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }

.hero-panel {
  background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 16px; padding: 34px 30px; backdrop-filter: blur(4px);
}
.hero-panel h3 { font-size: 17px; font-weight: 600; margin-bottom: 22px; color: #fff; }
.hero-panel .hp-item { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px dashed rgba(255, 255, 255, 0.16); }
.hero-panel .hp-item:last-child { border-bottom: none; }
.hero-panel .hp-ic {
  width: 40px; height: 40px; flex: none; border-radius: 10px;
  background: rgba(127, 212, 201, 0.14); color: #7fd4c9;
  display: flex; align-items: center; justify-content: center;
}
.hero-panel .hp-ic svg { width: 20px; height: 20px; }
.hero-panel .hp-t { font-size: 15px; font-weight: 600; color: #fff; }
.hero-panel .hp-d { font-size: 13px; color: rgba(255, 255, 255, 0.68); }

/* 统计条 */
.stats-bar { background: var(--c-card); border-bottom: 1px solid var(--c-line); }
.stats-bar .stats { display: grid; grid-template-columns: repeat(4, 1fr); }
.stats-bar .stat { padding: 30px 20px; text-align: center; border-left: 1px solid var(--c-line); }
.stats-bar .stat:first-child { border-left: none; }
.stats-bar .stat b { font-size: 32px; color: var(--c-primary); font-weight: 700; }
.stats-bar .stat span { display: block; margin-top: 4px; font-size: 14px; color: var(--c-text-2); }

/* ---------- 特色列表（左右图/文） ---------- */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 26px 0; }
.feature-row .fr-visual {
  border-radius: 16px; background: var(--c-primary); min-height: 300px;
  display: flex; align-items: center; justify-content: center; color: #fff; overflow: hidden;
  position: relative;
}
.feature-row .fr-visual img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.feature-row .fr-eyebrow { font-size: 13px; letter-spacing: 2px; color: var(--c-accent); font-weight: 600; }
.feature-row h2 { font-size: 28px; color: var(--c-primary-dark); margin: 10px 0 16px; font-weight: 700; }
.feature-row p.lead { color: var(--c-text-2); margin-bottom: 22px; }
.ft-list li { display: flex; gap: 12px; padding: 9px 0; font-size: 15px; color: var(--c-text); }
.ft-list li::before {
  content: ""; flex: none; width: 18px; height: 18px; margin-top: 5px; border-radius: 50%;
  background: var(--c-accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232b9e8f' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center / 10px no-repeat;
}

/* 可视化占位图形 */
.fake-panel { width: 100%; max-width: 420px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.18); border-radius: 14px; padding: 26px; }
.fake-panel .fp-bar { height: 12px; border-radius: 6px; background: rgba(255,255,255,0.18); margin-bottom: 14px; }
.fake-panel .fp-bar.half { width: 62%; }
.fake-panel .fp-row { display: flex; gap: 12px; margin-bottom: 14px; }
.fake-panel .fp-chip { flex: 1; height: 46px; border-radius: 8px; background: rgba(255,255,255,0.12); }
.fake-panel .fp-chip.accent { background: rgba(127,212,201,0.35); }
.fake-panel .fp-note { display: flex; justify-content: space-between; }
.fake-panel .fp-note span { font-size: 12px; color: rgba(255,255,255,0.6); }

/* ---------- 服务对象 ---------- */
.obj-item { text-align: center; padding: 34px 20px; }
.obj-item .icon-box { margin: 0 auto 16px; }
.obj-item h3 { font-size: 17px; color: var(--c-primary-dark); margin-bottom: 8px; }
.obj-item p { font-size: 13.5px; color: var(--c-text-2); max-width: 240px; margin: 0 auto; }

/* ---------- 步骤 / 流程 ---------- */
.step-item { position: relative; padding: 30px 24px; }
.step-num {
  width: 44px; height: 44px; border-radius: 50%; margin-bottom: 16px;
  background: var(--c-primary); color: #fff; font-size: 18px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step-item h3 { font-size: 17px; color: var(--c-primary-dark); margin-bottom: 8px; }
.step-item p { font-size: 14px; color: var(--c-text-2); }

/* ---------- 客户案例 ---------- */
.case-card { overflow: hidden; padding: 0; }
.case-card .cc-body { padding: 26px; }
.case-card .cc-tag { display: inline-block; font-size: 12px; color: var(--c-accent); background: var(--c-accent-soft); padding: 3px 12px; border-radius: 999px; margin-bottom: 12px; }
.case-card h3 { font-size: 17px; color: var(--c-primary-dark); margin-bottom: 10px; }
.case-card p { font-size: 13.5px; color: var(--c-text-2); }
.case-card .cc-metrics { display: flex; gap: 20px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--c-line); }
.case-card .cc-metrics b { display: block; font-size: 22px; color: var(--c-primary); }
.case-card .cc-metrics span { font-size: 12px; color: var(--c-text-3); }
.case-visual {
  height: 150px; background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-light) 100%);
  display: flex; align-items: center; justify-content: center; color: #fff; position: relative;
}
.case-visual span { font-size: 40px; font-weight: 700; opacity: 0.9; }

/* ---------- 关于我们 ---------- */
.mv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.mv-item { text-align: center; padding: 36px 24px; }
.mv-item .icon-box { margin: 0 auto 16px; width: 60px; height: 60px; border-radius: 50%; }
.mv-item h3 { font-size: 18px; color: var(--c-primary-dark); margin-bottom: 10px; }
.mv-item p { font-size: 14px; color: var(--c-text-2); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 40px; }
.contact-info .ci-item { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--c-line); }
.contact-info .ci-item:last-child { border-bottom: none; }
.contact-info .ci-ic {
  width: 46px; height: 46px; flex: none; border-radius: 12px;
  background: var(--c-accent-soft); color: var(--c-accent);
  display: flex; align-items: center; justify-content: center;
}
.contact-info .ci-ic svg { width: 22px; height: 22px; }
.contact-info .ci-t { font-size: 14px; color: var(--c-text-3); }
.contact-info .ci-d { font-size: 16px; color: var(--c-primary-dark); font-weight: 600; margin-top: 2px; }

.contact-form .form-item { margin-bottom: 18px; }
.contact-form label { display: block; font-size: 14px; color: var(--c-text); margin-bottom: 8px; font-weight: 500; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--c-border); border-radius: 8px;
  font-size: 15px; font-family: inherit; color: var(--c-text); background: var(--c-card);
  transition: border-color 0.2s;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--c-primary-light);
}
.contact-form textarea { resize: vertical; min-height: 120px; }

/* ---------- CTA 区块 ---------- */
.cta-box {
  background: linear-gradient(150deg, var(--c-primary-dark) 0%, var(--c-primary) 60%, var(--c-primary-light) 100%);
  border-radius: 18px; padding: 56px 40px; text-align: center; color: #fff;
}
.cta-box h2 { font-size: 30px; font-weight: 700; }
.cta-box p { margin-top: 12px; color: rgba(255, 255, 255, 0.8); }
.cta-box .btn-row { margin-top: 30px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-primary-dark); color: rgba(255, 255, 255, 0.72); font-size: 14px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding: 56px 0 40px; }
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 18px; font-weight: 600; }
.site-footer .f-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.site-footer .f-brand .logo { width: 34px; height: 34px; display: block; object-fit: contain; }
.site-footer .f-brand b { font-size: 17px; color: #fff; letter-spacing: 1px; }
.site-footer .f-desc { font-size: 13.5px; line-height: 1.9; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255, 255, 255, 0.72); transition: color 0.2s; }
.footer-links a:hover { color: #7fd4c9; }
.footer-contact li { margin-bottom: 10px; display: flex; gap: 8px; align-items: flex-start; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.12); padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255, 255, 255, 0.5); }

/* ---------- 页头横幅（内页） ---------- */
.page-hero { background: linear-gradient(160deg, var(--c-primary-dark) 0%, var(--c-primary) 70%); color: #fff; padding: 64px 0; }
.page-hero h1 { font-size: 34px; font-weight: 700; }
.page-hero p { margin-top: 12px; color: rgba(255, 255, 255, 0.78); max-width: 640px; }
.crumbs { font-size: 13px; color: rgba(255, 255, 255, 0.6); margin-top: 14px; }
.crumbs a { color: #7fd4c9; }

/* ---------- 分页/单列 ---------- */
.lead-box { max-width: 760px; margin: 0 auto; text-align: center; }
.lead-box h2 { font-size: 28px; color: var(--c-primary-dark); margin-bottom: 14px; }
.lead-box p { color: var(--c-text-2); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 36px; }
  .feature-row { gap: 36px; }
}

@media (max-width: 860px) {
  .site-header .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--c-line);
    box-shadow: 0 12px 24px rgba(31, 58, 95, 0.1);
    display: none; padding: 12px 20px 20px;
  }
  .site-header .main-nav.open { display: block; }
  .site-header .main-nav ul { flex-direction: column; gap: 0; }
  .site-header .main-nav a { display: block; padding: 14px 4px; border-bottom: 1px solid var(--c-line); font-size: 16px; }
  .site-header .main-nav a:hover, .site-header .main-nav a.active { border-bottom-color: var(--c-accent); color: var(--c-primary); }
  .nav-toggle { display: flex; }
  .header-actions .btn { display: none; }
  .hero .container { grid-template-columns: 1fr; padding-top: 56px; padding-bottom: 56px; }
  .hero-panel { margin-top: 8px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .feature-row { grid-template-columns: 1fr; gap: 28px; }
  .feature-row .fr-visual { min-height: 220px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .section { padding: 60px 0; }
  .sec-title { font-size: 26px; }
}

@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr; }
  .stats-bar .stats { grid-template-columns: repeat(2, 1fr); }
  .stats-bar .stat { border-left: none; border-bottom: 1px solid var(--c-line); }
  .hero h1 { font-size: 29px; }
  .hero .hero-sub { font-size: 15px; }
  .cta-box { padding: 40px 22px; }
  .cta-box h2 { font-size: 24px; }
  .mv-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .page-hero { padding: 48px 0; }
  .page-hero h1 { font-size: 27px; }
}