/* Arain 首页 */
@import url("/assets/fonts/fonts.css");

:root {
  --rt-cream: #F1EDE1;
  --rt-ink: #23202B;
  --rt-ink-2: #5A5566;
  --rt-clay: #C6613F;
  --rt-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --rt-serif: "Noto Serif SC", "Songti SC", Georgia, serif;
  --rt-gutter: clamp(33px, 5.4vw, 78px);
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-family: var(--rt-serif); font-size: 20px; line-height: 1.4; color: #141413; background: var(--rt-cream); }
main { display: flex; flex-direction: column; overflow: clip; }

.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 0; z-index: 999; background: var(--rt-cream); padding: 8px 14px; }

/* ---------- 顶部栏 ---------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; justify-content: space-between;
  height: 58px; padding: 0 clamp(22px, 5vw, 72px);
  font-family: var(--rt-sans);
  transition: transform .32s ease;
}
.site-nav.is-hidden { transform: translateY(-100%); }
.site-nav-owl { display: flex; transform: translateY(5px); }
.site-nav-owl canvas { display: block; width: 36px; height: 40px; }
.site-nav-links { display: flex; gap: clamp(20px, 3vw, 36px); }
.site-nav-links a { font-size: 15px; color: var(--rt-ink-2); padding: 4px 0; border-bottom: 1px solid transparent; text-decoration: none; transition: color .2s, border-color .2s; }
.site-nav-links a:hover { color: var(--rt-clay); }
.site-nav a:focus-visible { outline: 2px solid var(--rt-clay); outline-offset: 3px; border-radius: 3px; }

/* ---------- hero ---------- */
.hero { position: relative; padding-top: clamp(32px, 4.5vw, 64px); padding-bottom: 60px; }
.wrap { width: min(1441px, 100%); margin-inline: auto; padding-inline: var(--rt-gutter); }
.hero-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(20px, 2.2vw, 32px); align-items: end; }
.hero-txt { grid-column: 1 / 8; }
.hero-art { grid-column: 8 / 13; display: flex; }

.rt-hero-eyebrow {
  display: inline-block;
  font-family: var(--rt-sans); font-weight: 500;
  font-size: clamp(1.3rem, 2.4vw, 1.95rem);
  letter-spacing: .12em;
  margin-bottom: .5em;
}
.rt-hero-h1 { font-family: var(--rt-sans); font-weight: 700; font-size: clamp(2.9rem, 8.2vw, 5.5rem); line-height: 1.1; margin: 0; }
.rt-h1-link { color: inherit; transition: color .2s; }
/* 下划线挂在词 span 上:text-decoration 不会穿透 inline-block 后代 */
.rt-h1-link .animate-word { text-decoration: underline; text-decoration-color: var(--rt-ink); text-underline-offset: .12em; text-decoration-thickness: 4px; transition: text-decoration-color .2s; }
.rt-h1-link:hover { color: var(--rt-clay); }
.rt-h1-link:hover .animate-word { text-decoration-color: var(--rt-clay); }

/* 右栏——画布与标题底边对齐（alignHeroOwl 微调高度/位移） */
/* 画布的固有尺寸是 backing 像素数,会经 min-width:auto 把 flex 项撑出容器——归零 */
.home_hero_bump { flex: 1; display: flex; padding-bottom: 5px; min-width: 0; }
.rt-hero-owl { display: block; flex: 1; width: min(100%, 520px); min-width: 0; min-height: clamp(200px, 19vw, 280px); margin-left: auto; }

/* ---------- 横幅影片卡 ---------- */
.cta-bg {
  position: relative; isolation: isolate; overflow: clip;
  width: 100%;
  max-width: min(1285px, calc(100% - var(--rt-gutter) * 2));
  margin: clamp(40px, 4.2vw, 61px) auto;
  border-radius: 24px;
  aspect-ratio: 16 / 9;
  min-height: 400px;
  background: #141413;
}
.rt-sky-video { position: absolute; inset: 0; z-index: -1; width: 100%; height: 100%; object-fit: cover; display: block; pointer-events: none; }
.rt-card-link { position: absolute; inset: 0; z-index: 2; }

/* ---------- 词组入场 ---------- */
.animate-word { display: inline-block; }
@media (prefers-reduced-motion: no-preference) {
  .animate-word { transition: opacity .55s ease, transform .55s ease; }
  .js-anim .animate-word { opacity: 0; transform: translateY(.35em); }
}

@media (max-width: 991px) {
  .hero-grid { display: flex; flex-direction: column; align-items: stretch; gap: 0; }
  .home_hero_bump { flex: none; width: 100%; }
  .rt-hero-owl { flex: none; height: clamp(190px, 42vw, 260px); margin: 8px auto 0; }
  /* 移动端整页几乎无滚动,留一点跑道让卡片滚动中张开 */
  .cta { padding-top: clamp(48px, 12vh, 110px); }
}
@media (prefers-reduced-motion: reduce) {
  .cta-bg { max-width: 100%; margin-top: 0; margin-bottom: 0; border-radius: 0; }
  .rt-sky-video { display: none; }
}