/* 李白系列下一代官网：主题语义来自 tokens.css，本文件只负责官网布局。 */
* { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; }
body { min-width: 320px; overflow-x: clip; margin: 0; color: var(--color-text); background: var(--color-background); font-family: var(--font-body); font-size: var(--text-md); font-synthesis: none; }
body::before { position: fixed; inset: 0; z-index: -2; content: ""; background: radial-gradient(circle at 72% 8%, var(--hero-glow), transparent 34rem), linear-gradient(180deg, var(--color-background), var(--color-background-deep) 42%, var(--color-background) 72%); pointer-events: none; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
.shell { width: min(1380px, calc(100% - 5rem)); margin-inline: auto; }
.skip-link { position: fixed; top: -5rem; left: 1rem; z-index: 100; padding: .75rem 1rem; border-radius: var(--radius-sm); color: var(--color-text-inverse); background: var(--color-accent); font-weight: 750; }
.skip-link:focus { top: 1rem; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }

.site-header { position: relative; z-index: 50; display: flex; align-items: center; min-height: 5.25rem; border-bottom: 1px solid var(--color-border); }
.site-header::after { display: none; }
.brand { display: inline-flex; align-items: center; gap: .75rem; min-width: max-content; }
.brand-mark, .footer-mark, .core-mark { flex: 0 0 auto; width: 2.2rem; height: 2.2rem; padding: .18rem; border-radius: .6rem; fill: var(--color-text-inverse); background: var(--color-text); }
.brand > span { display: grid; gap: .08rem; }
.brand-name { color: var(--color-text); font-family: var(--font-display); font-size: 1.05rem; font-weight: 800; letter-spacing: -.03em; }
.brand-subtitle { color: var(--color-text-muted); font: 650 .6rem/1.2 var(--font-body); letter-spacing: .08em; }
.site-nav { position: static; display: flex; flex-direction: row; gap: 2.5rem; margin-left: auto; padding: 0; border: 0; background: transparent; box-shadow: none; font: 700 .82rem/1 var(--font-body); }
.site-nav a { padding: 1rem 0; border: 0; color: var(--color-text-soft); }
.site-nav a:hover { color: var(--color-accent); }
.menu-toggle { display: none; }
.header-actions { display: flex; align-items: center; gap: .65rem; margin-left: clamp(1.5rem, 5vw, 5rem); }
.disclosure { position: relative; }
.control-button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; gap: .55rem; padding: 0 .85rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm); color: var(--color-text-soft); background: var(--color-surface-raised); cursor: pointer; }
.theme-trigger { min-width: 7.6rem; }
.popover { position: absolute; top: calc(100% + .55rem); right: 0; width: 15rem; padding: .45rem; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface-raised); box-shadow: var(--shadow-float); backdrop-filter: blur(18px); }
.popover[hidden] { display: none; }
.popover a, .theme-menu button { display: flex; width: 100%; min-height: 48px; align-items: center; justify-content: space-between; gap: 1rem; padding: .55rem .7rem; border: 0; border-radius: var(--radius-sm); background: transparent; text-align: left; }
.popover a:hover, .theme-menu button:hover { background: var(--color-accent-soft); }
.popover a > span, .popover a strong { display: block; }
.popover small { display: block; margin-top: .18rem; color: var(--color-text-muted); }
.theme-menu { width: 10rem; }
.theme-menu button span { opacity: 0; color: var(--color-accent); }
.theme-menu button[aria-pressed="true"] { color: var(--color-accent); background: var(--color-accent-soft); }
.theme-menu button[aria-pressed="true"] span { opacity: 1; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; gap: .75rem; padding: 0 1.15rem; border: 1px solid transparent; border-radius: var(--radius-sm); font-size: .86rem; font-weight: 750; white-space: nowrap; transition: transform var(--duration-fast) var(--ease-out), background var(--duration-fast), border-color var(--duration-fast); }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--color-accent); box-shadow: 0 10px 28px color-mix(in srgb, var(--color-accent) 24%, transparent); }
.button-primary:hover { background: var(--color-accent-hover); }
.button-secondary { border-color: var(--color-border-strong); color: var(--color-text); background: var(--color-surface-raised); }
.text-link { display: inline-flex; align-items: center; gap: .5rem; color: var(--color-accent); font-weight: 750; white-space: nowrap; }

.hero { display: grid; grid-template-columns: minmax(34rem, 1.05fr) minmax(30rem, .95fr); align-items: center; gap: clamp(2rem, 4vw, 4.5rem); min-height: 42rem; padding-block: 4rem 3rem; border: 0; }
.hero-copy { position: relative; z-index: 2; }
.eyebrow, .section-kicker { display: flex; align-items: center; gap: .7rem; margin: 0 0 1.4rem; color: var(--color-accent); font: 800 .78rem/1 var(--font-body); letter-spacing: .04em; }
.eyebrow > span { display: inline-block; width: 2.5rem; height: 2px; background: var(--color-accent); }
.hero h1 { margin: 0 0 1.4rem; color: var(--color-text); font: 800 clamp(3.2rem, 4.55vw, 4.8rem)/1.08 var(--font-display); letter-spacing: -.075em; }
.title-line { display: block; white-space: nowrap; }
.hero h1 .title-line-soft { color: var(--color-text-soft); }
.hero-text { max-width: 38rem; margin: 0 0 2rem; color: var(--color-text-soft); font-size: 1.08rem; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.play { display: grid; width: 1.55rem; height: 1.55rem; place-items: center; border: 1px solid var(--color-border-strong); border-radius: 50%; font-size: .55rem; }
.hero-footnote { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; margin: 2.2rem 0 0; color: var(--color-text-muted); font: 650 .68rem/1.5 var(--font-mono); letter-spacing: .08em; }
.hero-footnote i { width: 2px; height: 2px; border-radius: 50%; background: var(--color-accent); }

.product-field { position: relative; min-height: 34rem; isolation: isolate; }
.product-field::before { position: absolute; inset: 8% 6%; z-index: -2; content: ""; border-radius: 50%; background: radial-gradient(circle, var(--hero-glow), transparent 66%); filter: blur(10px); }
.orbit { position: absolute; top: 50%; left: 50%; z-index: -1; border: 1px solid var(--field-line); border-radius: 50%; transform: translate(-50%, -50%) rotate(-9deg); }
.orbit::before, .orbit::after { position: absolute; width: .45rem; height: .45rem; border-radius: 50%; content: ""; background: var(--field-dot); box-shadow: 0 0 0 .28rem color-mix(in srgb, var(--field-dot) 12%, transparent); }
.orbit::before { top: 10%; left: 20%; }
.orbit::after { right: 14%; bottom: 17%; }
.orbit-one { width: 52%; height: 39%; }
.orbit-two { width: 75%; height: 57%; transform: translate(-50%, -50%) rotate(11deg); }
.orbit-three { width: 96%; height: 75%; transform: translate(-50%, -50%) rotate(-5deg); }
.field-core { position: absolute; top: 50%; left: 50%; display: grid; width: 11.5rem; height: 11.5rem; place-content: center; justify-items: center; border: 1px solid var(--color-border); border-radius: 50%; background: var(--color-surface-raised); box-shadow: 0 0 0 1.4rem color-mix(in srgb, var(--color-surface) 45%, transparent), var(--shadow-soft); transform: translate(-50%, -50%); backdrop-filter: blur(16px); }
.core-mark { width: 3.8rem; height: 3.8rem; margin-bottom: .8rem; padding: .5rem; background: linear-gradient(145deg, var(--color-accent), #15439f); }
.field-core strong { font-size: 1.2rem; }
.field-core small { margin-top: .25rem; color: var(--color-text-muted); font-size: .68rem; }
.field-node { position: absolute; display: grid; min-width: 7.2rem; min-height: 7.2rem; place-content: center; justify-items: center; padding: .75rem; border: 1px solid var(--color-border); border-radius: 50%; background: var(--color-surface-raised); box-shadow: var(--shadow-soft); text-align: center; transition: transform var(--duration-medium) var(--ease-out), border-color var(--duration-fast), background var(--duration-fast); backdrop-filter: blur(12px); }
a.field-node:hover { z-index: 5; border-color: var(--color-accent); transform: translateY(-6px) scale(1.03); }
.field-node > span { color: var(--color-accent); font-size: 1.35rem; }
.field-node strong { margin-top: .32rem; font-size: .83rem; }
.field-node small { margin-top: .18rem; color: var(--color-text-muted); font-size: .6rem; }
.field-node.is-active { color: #fff; border-color: var(--color-accent); background: var(--color-accent); }
.field-node.is-active > span, .field-node.is-active small { color: #fff; }
.node-luobi { top: 1%; left: 24%; }
.node-tiandijian { top: 3%; right: 12%; }
.node-sanjin { top: 38%; right: -1%; }
.node-changfeng { top: 42%; left: -1%; }
.node-yumenguan { bottom: 1%; left: 25%; }
.node-more { right: 13%; bottom: 1%; }

.intent-section { padding: 1.15rem 1.5rem 1.5rem; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface-raised); box-shadow: var(--shadow-soft); backdrop-filter: blur(15px); }
.intent-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.intent-heading h2 { margin: 0; font-size: 1.3rem; letter-spacing: -.04em; }
.intent-heading p { margin: 0; color: var(--color-text-muted); font-size: .82rem; }
.intent-router { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; }
.intent-router a { display: grid; grid-template-columns: auto 1fr auto; min-height: 84px; align-items: center; gap: .75rem; padding: .85rem 1rem; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); transition: border-color var(--duration-fast), transform var(--duration-fast); }
.intent-router a:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.intent-router a > span:first-child { color: var(--color-accent); font-size: 1.3rem; }
.intent-copy { display: grid; gap: .28rem; min-width: 0; }
.intent-copy small { color: var(--color-text-muted); font-size: .7rem; font-weight: 550; line-height: 1.4; }
.intent-router strong { font-size: .86rem; }
.intent-router b { font-size: 1.2rem; }

.products-section { padding-block: 4.5rem; }
.section-heading { display: grid; grid-template-columns: 1fr minmax(20rem, 34rem); align-items: end; gap: 2rem; margin-bottom: 1.4rem; }
.section-heading h2 { margin: 0; color: var(--color-text); font: 800 clamp(2rem, 4vw, 3.2rem)/1 var(--font-display); letter-spacing: -.065em; }
.section-heading .section-kicker { margin-bottom: .7rem; }
.section-intro { max-width: 34rem; margin: 0; color: var(--color-text-muted); line-height: 1.7; }
.product-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 0; padding: 0; border: 0; list-style: none; }
.product-row { position: relative; display: flex; min-height: 18rem; flex-direction: column; align-items: flex-start; gap: .8rem; overflow: hidden; padding: 1.75rem; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); transition: border-color var(--duration-fast), transform var(--duration-medium) var(--ease-out), box-shadow var(--duration-medium); }
.product-row:hover { border-color: var(--color-border-strong); background: var(--color-surface); box-shadow: var(--shadow-soft); transform: translateY(-4px); }
.product-row::after { position: absolute; right: -15%; bottom: -28%; width: 14rem; height: 14rem; border: 1px solid var(--color-border); border-radius: 50%; content: ""; background: radial-gradient(circle, var(--color-accent-soft), transparent 67%); }
.product-identity { position: relative; z-index: 1; }
.product-identity h3 { margin: 0; color: var(--color-text); font: 800 1.5rem/1.1 var(--font-display); letter-spacing: -.04em; }
.product-identity p { margin: .35rem 0 0; color: var(--color-text-muted); font-size: .74rem; }
.product-use-case { position: relative; z-index: 1; margin: auto 0 0; color: var(--color-text-soft); font-size: .95rem; font-weight: 750; line-height: 1.5; }
.product-poem { display: block; margin-top: .45rem; color: var(--color-text-muted); font-size: .78rem; font-weight: 500; line-height: 1.55; }
.product-poem cite, .foundation-poems cite { font-style: normal; white-space: nowrap; }
.foundation-poems { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.foundation-poems p { display: flex; flex-wrap: wrap; align-items: baseline; gap: .35rem .7rem; margin: 0; padding: 1rem 1.25rem; border: 1px solid var(--color-border); border-radius: var(--radius-lg); color: var(--color-text-muted); background: var(--color-surface); font-size: .8rem; line-height: 1.6; }
.foundation-poems strong { color: var(--color-text); font-size: .95rem; }
.product-description { position: relative; z-index: 1; max-width: 30rem; margin: 0; color: var(--color-text-muted); font-size: .8rem; line-height: 1.7; }
.row-link { position: relative; z-index: 2; display: inline-flex; min-height: 44px; align-items: center; gap: .5rem; margin-top: .4rem; padding: 0 .85rem; border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm); color: var(--color-text); background: var(--color-surface-raised); font-size: .78rem; font-weight: 750; }
.product-luobi { background: linear-gradient(145deg, #f8f2e8, var(--color-surface) 75%); }
.product-tiandijian { background: linear-gradient(145deg, #e5f1ff, var(--color-surface) 75%); }
.product-yumenguan { grid-column: 1 / -1; min-height: 14rem; padding-right: min(40%, 30rem); }
.product-changfeng { background: linear-gradient(145deg, #e8f8ef, var(--color-surface) 75%); }
:root[data-theme="dark"] .product-luobi { background: linear-gradient(145deg, #231d18, var(--color-surface) 75%); }
:root[data-theme="dark"] .product-tiandijian { background: linear-gradient(145deg, #10233d, var(--color-surface) 75%); }
:root[data-theme="dark"] .product-changfeng { background: linear-gradient(145deg, #132a22, var(--color-surface) 75%); }

.access-section { padding: 0 0 4rem; }
.access-panel { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 4rem; padding: 3rem 0; border-top: 1px solid var(--color-border-strong); }
.access-panel h2 { max-width: 12em; margin: 0; color: var(--color-text); font: 800 clamp(2rem, 4vw, 3.6rem)/1.08 var(--font-display); letter-spacing: -.065em; }
.access-panel h2 span { color: var(--color-accent); }
.access-action { display: grid; justify-items: start; gap: 1.2rem; }
.access-action p { max-width: 35rem; margin: 0; color: var(--color-text-muted); line-height: 1.75; }
.access-actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.button-light { border-color: var(--color-border-strong); background: var(--color-surface); }
.site-footer { display: flex; min-height: 5rem; align-items: center; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: .72rem; }
.site-footer > div { display: flex; align-items: center; gap: .6rem; color: var(--color-text); font-weight: 750; }
.footer-mark { width: 1.65rem; height: 1.65rem; padding: .22rem; }
.site-footer > a { color: var(--color-accent); }

@media (max-width: 70rem) {
  .shell { width: min(100% - 3rem, 1100px); }
  .site-nav { gap: 1.3rem; }
  .header-actions { margin-left: 1.2rem; }
  .product-switcher, .theme-label { display: none; }
  .theme-trigger { min-width: 44px; padding: 0; }
  .hero { grid-template-columns: minmax(0, 1.1fr) minmax(28rem, .9fr); min-height: 38rem; gap: 1.5rem; }
  .product-field { transform: scale(.88); }
  .intent-router { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 48rem) {
  .shell { width: min(100% - 2rem, 42rem); }
  .product-space { scroll-margin-top: 4.5rem; }
  .site-header { min-height: 4.5rem; }
  .brand-subtitle, .header-cta, .site-nav { display: none; }
  .menu-toggle { display: inline-flex; min-height: 44px; align-items: center; margin-left: auto; padding: 0 .8rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: var(--color-surface-raised); }
  .site-nav.open { position: absolute; top: calc(100% + .5rem); right: 0; left: 0; display: grid; gap: 0; padding: .5rem; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface-raised); box-shadow: var(--shadow-float); backdrop-filter: blur(18px); }
  .site-nav.open a { min-height: 48px; padding: 1rem; border-radius: var(--radius-sm); }
  .header-actions { margin-left: .5rem; }
  .hero { display: flex; min-height: 0; flex-direction: column; gap: 2rem; padding-block: 3.5rem 2rem; }
  .hero h1 { font-size: clamp(2.35rem, 10.5vw, 3.5rem); }
  .hero-text { font-size: 1rem; }
  .hero-actions .button { flex: 1; }
  .hero-footnote { display: none; }
  .product-field { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; width: 100%; min-height: 0; transform: none; }
  .orbit, .field-core { display: none; }
  .field-node { position: static; display: grid; min-width: 0; min-height: 7rem; border-radius: var(--radius-md); transform: none; }
  a.field-node:hover { transform: translateY(-2px); }
  .intent-section { padding: 1rem; }
  .intent-heading { display: block; }
  .intent-heading p { margin-top: .5rem; }
  .intent-router { grid-template-columns: 1fr; }
  .products-section { padding-block: 3.5rem; }
  .section-heading { grid-template-columns: 1fr auto; gap: 1rem; }
  .section-heading .section-intro { grid-column: 1 / -1; grid-row: 2; }
  .product-list { grid-template-columns: 1fr; }
  .foundation-poems { grid-template-columns: 1fr; }
  .product-row, .product-yumenguan { grid-column: auto; min-height: 17rem; padding-right: 1.6rem; }
  .access-panel { grid-template-columns: 1fr; gap: 1.5rem; }
  .site-footer { flex-direction: column; align-items: flex-start; justify-content: center; padding-block: 1.5rem; }
}

@media (max-width: 25rem) {
  .brand-name { font-size: .92rem; }
  .hero-actions { display: grid; }
  .product-field { grid-template-columns: 1fr; }
  .section-heading { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}