/* ==========================================================================
   XGoal90 · 个人足球技术分享站
   纯静态样式，无任何外部依赖
   ========================================================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --green-deep: #0a3822;
  --green-dark: #0f4c2b;
  --green: #12803f;
  --green-bright: #1a9a4c;
  --grass: #22b45c;
  --bg: #f6faf7;
  --card: #ffffff;
  --border: #e3ece6;
  --text: #233129;
  --text-muted: #66766c;
  --radius: 14px;
  --shadow: 0 10px 26px rgba(15, 76, 43, 0.1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  color: var(--green-bright);
}

::selection {
  background: #bde8cc;
  color: var(--green-deep);
}

.container {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--green-dark);
}

.logo:hover {
  color: var(--green-dark);
  text-decoration: none;
}

.logo .ball {
  font-size: 1.15rem;
}

.logo b {
  color: var(--grass);
  font-weight: 800;
}

.site-nav {
  display: flex;
  gap: 4px;
}

.site-nav a {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--green-dark);
  background: #eef6f0;
  text-decoration: none;
}

.site-nav a.active {
  color: #fff;
  background: var(--green);
}

/* ---------- 首页 Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  text-align: center;
  padding: 96px 0 104px;
  background: linear-gradient(135deg, #0a3822 0%, #0f5c31 55%, #17873f 100%);
}

/* 球场中圈与中线 */
.hero::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 480px;
  height: 480px;
  transform: translate(-50%, -50%);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.hero::after {
  content: "";
  position: absolute;
  left: -40px;
  right: -40px;
  top: 50%;
  height: 2px;
  background: rgba(255, 255, 255, 0.08);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-kicker {
  display: inline-block;
  margin-bottom: 18px;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 3px;
  color: #d7f5e3;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.08);
}

.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.hero-sub {
  max-width: 640px;
  margin: 0 auto 32px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 11px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-light {
  background: #fff;
  color: var(--green-dark);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

.btn-light:hover {
  color: var(--green-dark);
}

.btn-outline {
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

/* ---------- 内页页头 ---------- */

.page-hero {
  background: linear-gradient(135deg, #0a3822, #12803f);
  color: #fff;
  padding: 60px 0 64px;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 800;
  margin-bottom: 10px;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.86);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- 区块 ---------- */

.section {
  padding: 56px 0 8px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--green-dark);
  margin-bottom: 6px;
}

.section-title::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 10px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--grass), var(--green-dark));
  vertical-align: -1px;
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ---------- 特色卡片 ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
}

.feature .icon {
  font-size: 1.9rem;
  margin-bottom: 12px;
}

.feature h3 {
  color: var(--green-dark);
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.feature p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ---------- 文章卡片 ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--grass);
  text-decoration: none;
  color: var(--text);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tag {
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--green);
  background: #e8f6ec;
}

.card h3 {
  color: var(--green-dark);
  font-size: 1.06rem;
  margin-bottom: 8px;
  line-height: 1.5;
}

.card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  flex: 1;
}

.card .more {
  margin-top: 14px;
  color: var(--green);
  font-weight: 600;
  font-size: 0.88rem;
}

/* ---------- 文章列表页 ---------- */

.article-list {
  max-width: 820px;
  margin: 48px auto 0;
}

article.post {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin-bottom: 22px;
  scroll-margin-top: 88px;
}

.post-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.post-head .post-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post h2 {
  font-size: 1.22rem;
  color: var(--green-dark);
  line-height: 1.5;
}

.post p {
  margin-top: 12px;
  color: #38463d;
}

.post ul {
  margin: 10px 0 4px 20px;
  color: #38463d;
}

.post li {
  margin: 4px 0;
}

.post .tip {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: 10px;
  background: #eef7f1;
  border-left: 4px solid var(--grass);
  font-size: 0.92rem;
  color: #2e4a39;
}

/* ---------- 关于页 ---------- */

.about-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.about-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 36px;
}

.about-card h2 {
  font-size: 1.15rem;
  color: var(--green-dark);
  margin: 26px 0 10px;
}

.about-card h2:first-child {
  margin-top: 0;
}

.about-card p {
  color: #38463d;
}

.info-list {
  list-style: none;
  margin-top: 6px;
}

.info-list li {
  display: flex;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.95rem;
}

.info-list li:last-child {
  border-bottom: 0;
}

.info-list span {
  flex: 0 0 84px;
  color: var(--text-muted);
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: 80px;
  background: var(--green-deep);
  color: rgba(255, 255, 255, 0.82);
  padding: 44px 0 36px;
  text-align: center;
}

.site-footer .footer-brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 6px;
}

.site-footer p {
  font-size: 0.88rem;
  margin: 4px 0;
}

.site-footer a {
  color: #bfe8cd;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.site-footer a:hover {
  color: #fff;
}

/* ---------- 响应式 ---------- */

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 12px 0;
    gap: 8px;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 72px 0 80px;
  }

  .section {
    padding: 40px 0 4px;
  }

  article.post {
    padding: 22px 20px;
  }

  .about-card {
    padding: 26px 22px;
  }

  .info-list li {
    flex-direction: column;
    gap: 2px;
  }
}