/* ==========================================================================
   CoreRankAI 官网样式 (白底 + 蓝紫渐变辅色)
   ========================================================================== */

:root {
  --c-blue: #4b8df8;
  --c-purple: #6f5cf1;
  --c-gradient: linear-gradient(90deg, #4b8df8 0%, #6f5cf1 100%);
  --c-bg-white: #ffffff;
  --c-bg-light: #f8fafc;
  --c-text-main: #1c2430;
  --c-text-sub: #4a5668;
  --c-text-light: #7a8699;
  --c-border: #e6eaf0;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.7 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--c-text-main);
  background: var(--c-bg-white);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--c-blue); text-decoration: none; transition: all 0.2s; }
a:hover { color: var(--c-purple); }

/* 导航栏 */
.nav {
  position: sticky; top: 0; background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--c-border); z-index: 100;
}
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 16px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
/* 渐变 Logo */
.logo {
  font-weight: 800; font-size: 22px; letter-spacing: 0.5px;
  background: var(--c-gradient); -webkit-background-clip: text; background-clip: text;
  color: transparent; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { color: var(--c-text-main); font-weight: 500; font-size: 15px; }
.nav-links a:hover, .nav-links a.active { color: var(--c-blue); }
.nav-cta {
  background: var(--c-gradient); color: #fff !important;
  padding: 8px 20px; border-radius: 8px; font-weight: 600;
  box-shadow: 0 4px 12px rgba(75, 141, 248, 0.2);
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(75, 141, 248, 0.3); }

/* 首屏 Hero */
.hero { background: linear-gradient(180deg, var(--c-bg-light) 0%, var(--c-bg-white) 100%); padding: 100px 20px 80px; }
.hero-inner { max-width: 860px; margin: 0 auto; text-align: center; }
.hero h1 { font-size: 52px; line-height: 1.2; margin: 0 0 24px; letter-spacing: -1px; }
.hero .sub { font-size: 18px; color: var(--c-text-sub); margin: 0 0 16px; }
.hero .sub-strong { font-size: 20px; font-weight: 600; color: var(--c-text-main); margin: 0 0 36px; }
.hero-btns { display: flex; justify-content: center; gap: 16px; }

/* 按钮通用 */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: 8px; font-size: 16px; font-weight: 600;
  cursor: pointer; transition: all 0.2s; border: none;
}
.btn.primary { background: var(--c-gradient); color: #fff; box-shadow: 0 4px 14px rgba(111, 92, 241, 0.3); }
.btn.primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(111, 92, 241, 0.4); color: #fff; }
.btn.ghost { background: #fff; border: 1px solid var(--c-border); color: var(--c-text-main); box-shadow: 0 2px 6px rgba(0,0,0,0.02); }
.btn.ghost:hover { border-color: var(--c-blue); color: var(--c-blue); transform: translateY(-2px); }

/* 通用区块 */
section { padding: 80px 20px; }
section h2 { font-size: 32px; text-align: center; margin: 0 0 48px; letter-spacing: -0.5px; }
.grid-3 { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* 卡片 */
.card {
  background: #fff; border: 1px solid var(--c-border); border-radius: 16px; padding: 32px 24px;
  transition: all 0.3s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(75, 141, 248, 0.08); border-color: transparent; }
.card h3 { margin: 0 0 16px; font-size: 20px; color: var(--c-text-main); }
.card p { margin: 0; color: var(--c-text-sub); font-size: 15px; }

/* 痛点区背景 */
.pain { background: var(--c-bg-light); }
.pain-end { text-align: center; font-size: 22px; font-weight: 700; margin-top: 48px; color: var(--c-text-main); }

/* 信任清单 */
.trust { background: #fff; }
.trust .checklist { max-width: 820px; margin: 0 auto; padding: 0; list-style: none; }
.trust .checklist li { padding: 16px 0 16px 36px; position: relative; border-bottom: 1px solid var(--c-border); font-size: 16px; }
.trust .checklist li::before {
  content: "✓"; position: absolute; left: 0; top: 16px;
  color: var(--c-blue); font-weight: bold; font-size: 18px;
  background: rgba(75, 141, 248, 0.1); width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center; border-radius: 50%;
}
.note { max-width: 820px; margin: 24px auto 0; color: var(--c-text-light); font-size: 14px; line-height: 1.8; }

/* 阶段流程区 */
.process { background: var(--c-bg-light); }

/* 底部 CTA */
.cta { text-align: center; background: #111827; color: #fff; padding: 80px 20px; }
.cta h2 { color: #fff; margin-bottom: 24px; }
.cta p { max-width: 720px; margin: 0 auto 36px; color: #9ca3af; font-size: 17px; }

/* 表单页 */
.form-page { max-width: 680px; margin: 0 auto; padding: 80px 20px; }
.form-page h1 { font-size: 36px; margin: 0 0 16px; text-align: center; }
.form-page .lead { color: var(--c-text-sub); margin: 0 0 40px; text-align: center; font-size: 16px; }
.lead-form { background: #fff; padding: 40px; border-radius: 16px; border: 1px solid var(--c-border); box-shadow: 0 10px 40px rgba(0,0,0,0.03); }
.lead-form label { display: block; margin-bottom: 24px; font-weight: 600; font-size: 15px; color: var(--c-text-main); }
.lead-form label span { color: #ef4444; }
.lead-form input, .lead-form select, .lead-form textarea {
  width: 100%; margin-top: 8px; padding: 12px 16px; border: 1px solid var(--c-border);
  border-radius: 8px; font: inherit; background: var(--c-bg-light); transition: all 0.2s;
}
.lead-form input:focus, .lead-form textarea:focus { outline: none; border-color: var(--c-blue); background: #fff; box-shadow: 0 0 0 3px rgba(75, 141, 248, 0.1); }
.form-msg { margin-top: 16px; font-weight: 500; }
.form-msg.ok { color: #10b981; }
.form-msg.err { color: #ef4444; }
.form-note { color: var(--c-text-light); font-size: 13px; margin-top: 16px; text-align: center; }

/* 多选框样式 */
.checkbox-group { display: flex; flex-wrap: wrap; gap: 12px 24px; background: var(--c-bg-light); border: 1px solid var(--c-border); border-radius: 8px; padding: 16px; margin-bottom: 24px; }
.checkbox-group label { display: flex; align-items: center; margin-bottom: 0 !important; font-weight: normal; cursor: pointer; }
.checkbox-group input[type="checkbox"] { width: 18px !important; height: 18px; margin: 0 8px 0 0 !important; cursor: pointer; accent-color: var(--c-blue); }

/* 页脚 */
.foot { background: var(--c-bg-light); border-top: 1px solid var(--c-border); padding: 60px 20px 30px; }
.foot-inner { max-width: 1120px; margin: 0 auto; display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.foot strong { font-size: 20px; color: var(--c-text-main); display: block; margin-bottom: 12px; }
.foot p { color: var(--c-text-light); font-size: 14px; max-width: 400px; margin: 0; }
.foot-links a { display: block; margin-bottom: 12px; color: var(--c-text-sub); font-weight: 500; }
.copy { max-width: 1120px; margin: 40px auto 0; color: #9ca3af; font-size: 13px; border-top: 1px solid var(--c-border); padding-top: 24px; }

/* 后台管理页 (保持白底蓝调) */
.admin-page .container { max-width: 1280px; margin: 0 auto; padding: 40px 20px; }
.admin-page h1 { font-size: 24px; margin-bottom: 24px; }
.filters { margin: 0 0 24px; display: flex; gap: 12px; }
.filters a { padding: 8px 16px; border-radius: 6px; color: var(--c-text-sub); background: var(--c-bg-light); font-size: 14px; font-weight: 500; }
.filters a.active { background: var(--c-gradient); color: #fff; }
.tbl { width: 100%; border-collapse: separate; border-spacing: 0; background: #fff; font-size: 14px; border: 1px solid var(--c-border); border-radius: 12px; overflow: hidden; }
.tbl th, .tbl td { border-bottom: 1px solid var(--c-border); padding: 16px; text-align: left; vertical-align: top; }
.tbl th { background: var(--c-bg-light); font-weight: 600; color: var(--c-text-sub); }
.tbl tr:last-child td { border-bottom: none; }
.tbl tr:hover td { background: #f8fafc; }
.msg-cell { max-width: 240px; white-space: pre-wrap; color: var(--c-text-sub); }
.empty { text-align: center; color: var(--c-text-light); padding: 40px !important; }

/* 登录页 */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--c-bg-light); }
.login-box { background: #fff; padding: 48px 40px; border-radius: 16px; width: 100%; max-width: 400px; display: flex; flex-direction: column; gap: 20px; box-shadow: 0 10px 40px rgba(0,0,0,0.05); border: 1px solid var(--c-border); }
.login-box h1 { font-size: 24px; margin: 0 0 10px; text-align: center; color: var(--c-text-main); }
.login-box input { padding: 14px 16px; border: 1px solid var(--c-border); border-radius: 8px; background: var(--c-bg-light); font-size: 15px; transition: all 0.2s; }
.login-box input:focus { outline: none; border-color: var(--c-blue); background: #fff; box-shadow: 0 0 0 3px rgba(75, 141, 248, 0.1); }
/* ==================== 动效与图标点缀 ==================== */

/* 1. Hero 动态光晕 */
.hero {
  position: relative;
  overflow: hidden; /* 防止光晕溢出 */
}
.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(111, 92, 241, 0.15) 0%, rgba(75, 141, 248, 0.1) 40%, transparent 70%);
  filter: blur(60px);
  border-radius: 50%;
  z-index: 0;
  animation: floatGlow 10s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes floatGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-1900px, 0px) scale(1.1); }
}
.hero-inner {
  position: relative;
  z-index: 1; /* 确保文字在光晕上方 */
}

/* 2. SVG 图标容器 */
.icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(75, 141, 248, 0.1), rgba(111, 92, 241, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--c-purple);
  transition: all 0.3s ease;
}
.icon-box svg {
  width: 24px;
  height: 24px;
}

/* 3. 卡片悬停时，图标动效 */
.card:hover .icon-box {
  background: var(--c-gradient);
  color: #fff;
  transform: scale(1.05) rotate(3deg);
  box-shadow: 0 6px 16px rgba(111, 92, 241, 0.25);
}

/* 4. 如果首页卡片内容较多，微调一下内边距和标题间距 */
.card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 19px;
}


/* 响应式适配 */
@media (max-width: 860px) {
  .hero h1 { font-size: 38px; }
  .grid-3 { grid-template-columns: 1fr; }
  .nav-links { display: none; /* 移动端可以先隐藏导航，后续加汉堡菜单 */ }
  .lead-form { padding: 24px; }
  .foot-inner { flex-direction: column; }
}