/* =====================================================================
   千柚学院 Pomelo Academy — styles.css
   方向：「鲜柚 Fresh Citrus」清新柚绿 + 多汁珊瑚橙，温暖友好、可信
   全自包含：本地字体、内联 SVG，无任何外部 CDN 依赖
   ===================================================================== */

/* ---------- 自托管字体（构建期下载，运行时本地加载） ---------- */
@font-face {
  font-family: "Baloo 2";
  src: url("assets/fonts/baloo2-600.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Baloo 2";
  src: url("assets/fonts/baloo2-700.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Baloo 2";
  src: url("assets/fonts/baloo2-800.woff2") format("woff2");
  font-weight: 800; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Nunito";
  src: url("assets/fonts/nunito-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Nunito";
  src: url("assets/fonts/nunito-700.woff2") format("woff2");
  font-weight: 700; font-style: normal; font-display: swap;
}

/* ---------- 设计令牌 ---------- */
:root {
  --green-50:  #f1fbf5;
  --green-100: #e3f5ea;
  --green-200: #c2e9d3;
  --green-300: #8fd6b0;
  --green-400: #5cc795;
  --green-500: #3dae7b;
  --green-600: #2e8f63;
  --green-700: #247355;
  --green-800: #1b5640;
  --green-900: #123a2b;
  --coral:      #ff8a5c;
  --coral-soft: #ffdcc8;
  --coral-ink:  #e8643a;
  --cream: #fbfdf9;
  --ink:   #15271d;
  --text:  #49584e;
  --muted: #7c8b81;

  /* 中文走系统字体，拉丁文/品牌走自托管字体（按字形回退） */
  --font-display: "Baloo 2", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  --font-body: "Nunito", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, sans-serif;

  --radius: 22px;
  --radius-sm: 14px;
  --shadow-sm: 0 4px 14px rgba(20, 70, 45, .06);
  --shadow-md: 0 14px 38px rgba(20, 70, 45, .10);
  --shadow-lg: 0 26px 60px rgba(20, 70, 45, .14);
  --maxw: 1140px;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--cream);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
h1, h2, h3 { font-family: var(--font-display); color: var(--ink); line-height: 1.18; font-weight: 800; letter-spacing: .2px; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.section { padding: clamp(64px, 9vw, 116px) 0; }

/* 无障碍：跳转链接 / 焦点 */
.skip-link {
  position: absolute; left: -999px; top: 8px; z-index: 200;
  background: var(--green-700); color: #fff; padding: 10px 16px; border-radius: 10px;
}
.skip-link:focus { left: 12px; }
:focus-visible { outline: 3px solid var(--green-500); outline-offset: 3px; border-radius: 6px; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 700; font-size: 16px;
  padding: 14px 26px; border-radius: 999px; border: 2px solid transparent;
  cursor: pointer; transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: 15px; }
.btn-primary {
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: #fff; box-shadow: 0 10px 22px rgba(46, 143, 99, .28);
}
.btn-primary:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 16px 30px rgba(46, 143, 99, .36); }
.btn-ghost { color: var(--green-700); border-color: var(--green-300); background: rgba(255,255,255,.6); }
.btn-ghost:hover { border-color: var(--green-500); background: #fff; transform: translateY(-2px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251, 253, 249, .82);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid rgba(46, 143, 99, .10);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark { display: grid; place-items: center; }
.brand-mark svg { transition: transform .3s ease; }
.brand:hover .brand-mark svg { transform: rotate(-8deg) scale(1.06); }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-cn { font-family: var(--font-display); font-weight: 800; font-size: 21px; color: var(--ink); letter-spacing: 1px; }
.brand-en { font-family: var(--font-display); font-weight: 700; font-size: 10px; letter-spacing: 2.5px; color: var(--green-600); }

.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links > a:not(.btn) {
  font-weight: 700; color: var(--ink); font-size: 16px; position: relative; padding: 4px 0;
}
.nav-links > a:not(.btn)::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2.5px; width: 0;
  background: var(--green-500); border-radius: 2px; transition: width .25s ease;
}
.nav-links > a:not(.btn):hover { color: var(--green-700); }
.nav-links > a:not(.btn):hover::after { width: 100%; }

.nav-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; padding: 10px; cursor: pointer; }
.nav-toggle span { display: block; height: 2.5px; background: var(--ink); border-radius: 2px; margin: 4px 0; transition: transform .3s ease, opacity .3s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 8vw, 104px); overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(46px); opacity: .55; }
.blob-1 { width: 480px; height: 480px; background: radial-gradient(circle, var(--green-200), transparent 70%); top: -140px; right: -90px; }
.blob-2 { width: 420px; height: 420px; background: radial-gradient(circle, var(--coral-soft), transparent 70%); bottom: -160px; left: -120px; opacity: .5; }
.grain {
  position: absolute; inset: 0; opacity: .04; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-display); font-weight: 700; font-size: 14px; letter-spacing: .5px;
  color: var(--green-700); background: var(--green-100);
  padding: 8px 16px; border-radius: 999px; margin-bottom: 22px;
}
.eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--coral); box-shadow: 0 0 0 4px rgba(255,138,92,.22); }
.hero h1 { font-size: clamp(34px, 5.4vw, 60px); letter-spacing: 0; margin-bottom: 22px; }
.hl { position: relative; white-space: nowrap; }
.hl::after {
  content: ""; position: absolute; left: -2px; right: -2px; bottom: .08em; height: .34em; z-index: -1;
  background: linear-gradient(120deg, rgba(255,138,92,.45), rgba(255,138,92,.28));
  border-radius: 6px; transform: rotate(-1.2deg);
}
.hero-sub { font-size: clamp(16px, 1.6vw, 19px); color: var(--text); max-width: 540px; margin-bottom: 30px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 10px 12px; }
.hero-trust li {
  font-family: var(--font-display); font-weight: 600; font-size: 13.5px; color: var(--green-700);
  background: rgba(255,255,255,.7); border: 1px solid var(--green-200);
  padding: 7px 14px; border-radius: 999px;
}
.hero-art { position: relative; }

/* ---------- 资质条 ---------- */
.badges { background: var(--green-100); border-block: 1px solid var(--green-200); }
.badge-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 18px 40px;
  padding: 22px 24px; text-align: center;
}
.badge-row span { font-family: var(--font-display); font-weight: 600; color: var(--green-800); font-size: 16px; }

/* ---------- 区块通用标题 ---------- */
.kicker {
  font-family: var(--font-display); font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  font-size: 13px; color: var(--green-600); margin-bottom: 12px;
}
.kicker-light { color: var(--green-200); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto clamp(40px, 5vw, 60px); }
.section-head h2, .about-copy h2 { font-size: clamp(27px, 3.6vw, 42px); }
.section-lead { color: var(--muted); font-size: 18px; margin-top: 14px; }

/* ---------- 关于 ---------- */
.about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 54px; align-items: center; }
.about-copy h2 { margin-bottom: 22px; }
.about-copy p { margin-bottom: 16px; }
.about-copy strong { color: var(--green-700); }
.about-points { margin-top: 24px; display: grid; gap: 12px; }
.about-points li { display: flex; align-items: center; gap: 12px; font-weight: 700; color: var(--ink); }
.about-points span { font-size: 20px; }
.about-card {
  position: relative; background: linear-gradient(150deg, var(--green-600), var(--green-800));
  color: #fff; border-radius: 28px; padding: 48px 40px; box-shadow: var(--shadow-md); overflow: hidden;
}
.about-card blockquote p { font-family: var(--font-display); font-weight: 800; font-size: clamp(22px, 2.6vw, 30px); line-height: 1.3; color: #fff; }
.about-card footer { margin-top: 18px; color: var(--green-200); font-weight: 700; }
.about-slice {
  position: absolute; width: 150px; height: 150px; right: -44px; bottom: -44px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--coral), var(--coral-ink));
  opacity: .85;
}

/* ---------- 卡片网格通用 ---------- */
.card-grid { display: grid; gap: 24px; }
.features-grid { grid-template-columns: repeat(4, 1fr); }
.programs-grid { grid-template-columns: repeat(3, 1fr); }
.card {
  background: #fff; border: 1px solid var(--green-100); border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--green-200); }

/* 特色卡 */
.features { background: var(--green-50); }
.feature-icon {
  display: grid; place-items: center; width: 56px; height: 56px; border-radius: 16px;
  background: var(--green-100); color: var(--green-600); margin-bottom: 18px;
  transition: background .25s ease, color .25s ease, transform .25s ease;
}
.feature-card:hover .feature-icon { background: var(--green-500); color: #fff; transform: rotate(-6deg); }
.feature-card h3 { font-size: 20px; margin-bottom: 10px; }
.feature-card p { font-size: 15.5px; color: var(--text); }

/* 课程卡 */
.program-card { display: flex; flex-direction: column; }
.level-badge {
  align-self: flex-start; font-family: var(--font-display); font-weight: 700; font-size: 13px;
  letter-spacing: 1px; padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
}
.program-card h3 { font-size: 23px; margin-bottom: 6px; }
.program-for { color: var(--muted); font-weight: 700; font-size: 14px; margin-bottom: 18px; }
.program-card ul { display: grid; gap: 11px; }
.program-card li { position: relative; padding-left: 26px; font-size: 15.5px; }
.program-card li::before {
  content: ""; position: absolute; left: 0; top: .55em; width: 14px; height: 14px;
  border-radius: 50%; background: var(--green-300);
  box-shadow: inset 0 0 0 2px #fff, 0 0 0 2px var(--green-300);
}
.tier-1 .level-badge { background: var(--green-100); color: var(--green-700); }
.tier-2 .level-badge { background: var(--green-500); color: #fff; }
.tier-3 .level-badge { background: var(--coral); color: #fff; }
.tier-2 { border-color: var(--green-200); }
.tier-3 li::before { background: var(--coral); box-shadow: inset 0 0 0 2px #fff, 0 0 0 2px var(--coral); }

/* ---------- 联系 ---------- */
.contact-card {
  position: relative; overflow: hidden;
  background: linear-gradient(140deg, var(--green-700), var(--green-900));
  color: #fff; border-radius: 32px; padding: clamp(40px, 6vw, 72px);
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  box-shadow: var(--shadow-lg);
}
.contact-card::before {
  content: ""; position: absolute; width: 280px; height: 280px; right: -90px; top: -110px;
  border-radius: 50%; background: radial-gradient(circle, rgba(92,199,149,.4), transparent 70%);
}
.contact-intro h2 { color: #fff; font-size: clamp(25px, 3vw, 36px); margin-bottom: 16px; }
.contact-intro p { color: var(--green-200); }
.contact-methods { display: grid; gap: 16px; position: relative; }
.contact-item {
  display: flex; align-items: center; gap: 16px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
  padding: 18px 22px; border-radius: 16px; transition: background .2s ease, transform .2s ease;
}
.contact-item:hover { background: rgba(255,255,255,.14); transform: translateX(4px); }
.contact-ic { font-size: 24px; }
.contact-label { display: block; font-size: 13px; color: var(--green-200); font-weight: 700; letter-spacing: .5px; }
.contact-item a, .contact-value { font-family: var(--font-display); font-weight: 700; font-size: 18px; color: #fff; }
.contact-item a:hover { color: var(--coral-soft); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--green-900); color: var(--green-200); }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-start; gap: 32px; flex-wrap: wrap; padding: 56px 24px 36px; }
.footer-brand .brand-cn { color: #fff; font-family: var(--font-display); font-weight: 800; font-size: 22px; letter-spacing: 1px; display: block; }
.footer-brand .brand-en { color: var(--green-300); font-family: var(--font-display); font-weight: 700; font-size: 10px; letter-spacing: 2.5px; display: block; margin-top: 2px; }
.footer-brand p { margin-top: 12px; color: var(--green-300); font-size: 15px; }
.footer-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-nav a { font-weight: 700; color: var(--green-200); }
.footer-nav a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); }
.footer-bottom-inner { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding: 20px 24px; }
.copyright { font-size: 13.5px; color: var(--green-300); }
.beian a { font-size: 13.5px; color: var(--green-300); transition: color .2s ease; }
.beian a:hover { color: #fff; text-decoration: underline; }

/* ---------- 动效：滚动揭示 + Hero 载入 ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s cubic-bezier(.2,.7,.3,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }

@keyframes floatY { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.float-slow { animation: floatY 7s ease-in-out infinite; }
.float-mid  { animation: floatY 5.2s ease-in-out infinite; }
.float-fast { animation: floatY 4s ease-in-out infinite; }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-art { max-width: 440px; margin-inline: auto; order: -1; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-card { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 76px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 6px;
    background: var(--cream); border-bottom: 1px solid var(--green-200);
    padding: 14px 24px 22px; box-shadow: var(--shadow-md);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: transform .25s ease, opacity .25s ease;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links > a:not(.btn) { padding: 12px 4px; border-bottom: 1px solid var(--green-100); }
  .nav-links > a:not(.btn)::after { display: none; }
  .nav-cta { margin-top: 8px; text-align: center; justify-content: center; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .programs-grid, .features-grid { grid-template-columns: 1fr; }
  .footer-grid { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .hero-cta { flex-direction: column; }
}

/* ---------- 尊重"减少动态效果"偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .float-slow, .float-mid, .float-fast { animation: none; }
  .btn, .card, .feature-icon, .contact-item { transition: none; }
}