/* ============================================================
   home.css — 首页专属组件（仅首页在 main.css 之后加载覆盖）
   共享件（nav/footer/按钮/徽章/卡片/价格卡/reveal）已在 main.css 升级，此处不重复。
   仅含：签名层(grain/aura/cursor) + hero + 终端 + 信任条 + bento + 协议演示 + 容错图 + FAQ + CTA
   ============================================================ */

/* ---------- 签名①：全站细颗粒（静态 SVG 噪声 data-URI，零 rAF，screen 混合，极低透明） ---------- */
.grain { position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: .4; mix-blend-mode: screen;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E"); }

/* aurora mesh 漂浮球 */
.aura { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .55; pointer-events: none; z-index: 0;
  will-change: transform; animation: aura-drift 22s var(--ease-io) infinite alternate; }
.aura-cyan { background: radial-gradient(circle, rgba(53,230,219,.5), transparent 70%); }
.aura-violet { background: radial-gradient(circle, rgba(154,134,255,.42), transparent 70%); }
@keyframes aura-drift { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(4%,-6%,0) scale(1.14); } }

/* ============================================================
   HERO —— 非对称：左文案 + 右浮起终端，OLED 真黑铺流光背景图
   ============================================================ */
.hero { position: relative; isolation: isolate; overflow: hidden;
  padding-top: clamp(48px,7vw,96px); padding-bottom: clamp(64px,9vw,128px); }
.hero-bg { position: absolute; inset: 0; z-index: -3; }
.hero-bg img { position: absolute; top: 50%; right: -6%; transform: translateY(-50%);
  width: min(1180px,88%); height: auto; max-width: none; opacity: .9;
  -webkit-mask: radial-gradient(120% 90% at 78% 45%, black 30%, transparent 72%);
          mask: radial-gradient(120% 90% at 78% 45%, black 30%, transparent 72%); }
/* 左侧黑场压暗，保证中文可读 + OLED 落黑 */
.hero::before { content: ""; position: absolute; inset: 0; z-index: -2; pointer-events: none;
  background: linear-gradient(90deg, var(--bg-0) 8%, rgba(4,5,10,.72) 38%, rgba(4,5,10,.15) 62%, transparent 80%),
             linear-gradient(0deg, var(--bg-0), transparent 34%); }
/* 细网格 */
.hero-grid { position: absolute; inset: 0; z-index: -2; pointer-events: none; opacity: .5;
  -webkit-mask: radial-gradient(90% 80% at 30% 40%, black, transparent 78%);
          mask: radial-gradient(90% 80% at 30% 40%, black, transparent 78%);
  background-image: linear-gradient(var(--line-2) 1px, transparent 1px), linear-gradient(90deg, var(--line-2) 1px, transparent 1px);
  background-size: 56px 56px; }
.hero .aura-cyan { width: 520px; height: 520px; top: -120px; right: 8%; z-index: -2; }
.hero .aura-violet { width: 440px; height: 440px; bottom: -160px; left: -60px; z-index: -2; animation-delay: -8s; }

.hero-inner { position: relative; display: grid; grid-template-columns: minmax(0,1.05fr) minmax(0,.95fr);
  gap: clamp(32px,5vw,72px); align-items: center; }
.hero-copy { max-width: 640px; }
.hero .badge { margin-bottom: var(--sp-4); }
.hero h1 { font-family: var(--font-display); font-weight: 600; font-size: var(--fs-hero); line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight); margin: var(--sp-4) 0 var(--sp-5); }
/* 第二行标题：实心白字（始终可见，不依赖渐变裁切）+ 渐变发光下划线 */
.hero h1 .u { position: relative; white-space: nowrap; color: var(--text-1); }
.hero h1 .u::after { content: ""; position: absolute; left: 0; right: 0; bottom: -.09em; height: .09em; border-radius: 2px;
  background: var(--grad-aurora); opacity: .9; box-shadow: var(--glow-accent); }
.hero-sub { font-size: clamp(1.02rem,.96rem + .4vw,1.2rem); line-height: var(--lh-base); color: var(--text-2); max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin: var(--sp-7) 0 var(--sp-5); }
.hero-baseurl { margin-top: var(--sp-2); }

/* 浮起终端窗口 */
.term { position: relative; border-radius: var(--r-xl); overflow: hidden; background: var(--bg-1);
  border: 1px solid var(--line-1); box-shadow: var(--shadow-3), var(--edge-top); }
.term::before { content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; pointer-events: none;
  background: var(--grad-edge); opacity: .4;
  -webkit-mask: linear-gradient(black,black) content-box, linear-gradient(black,black);
          mask: linear-gradient(black,black) content-box, linear-gradient(black,black);
  -webkit-mask-composite: xor; mask-composite: exclude; }
.hero .term { transform: perspective(1400px) rotateY(-6deg) rotateX(2deg); transform-origin: left center; }
.term-bar { display: flex; align-items: center; gap: var(--sp-2); padding: var(--sp-3) var(--sp-4);
  background: var(--bg-2); border-bottom: 1px solid var(--line-1); }
.term-bar i { width: 11px; height: 11px; border-radius: 50%; background: rgba(255,255,255,.14); }
.term-bar i:nth-child(1) { background: rgba(255,107,107,.7); }
.term-bar i:nth-child(2) { background: rgba(251,192,74,.7); }
.term-bar i:nth-child(3) { background: rgba(52,224,160,.7); }
.term-title { margin-left: var(--sp-2); font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--text-3); }
.term-bar .copy-btn { margin-left: auto; }

.hero pre, .codewin pre { font-family: var(--font-mono); font-size: var(--fs-sm); line-height: 1.75; color: var(--text-1);
  overflow-x: auto; padding: var(--sp-5); tab-size: 2; -webkit-overflow-scrolling: touch; }
.hero pre .c, .codewin pre .c { color: var(--text-3); }
.hero pre .k, .codewin pre .k { color: var(--brand-strong); }
.hero pre .s, .codewin pre .s { color: var(--accent-strong); }
.hero pre .n, .codewin pre .n { color: var(--violet); }

/* ============================================================
   信任数据条（真实数字瓦片 / 冷启动价值点卡 + 厂商 marquee）
   ============================================================ */
.trust { position: relative; padding-block: var(--sp-8); border-top: 1px solid var(--line-2); border-bottom: 1px solid var(--line-2);
  background: linear-gradient(180deg, rgba(255,255,255,.012), transparent); }
.trust-lead { text-align: center; color: var(--text-2); font-size: var(--fs-md); margin-bottom: var(--sp-7); }
.trust-lead b { color: var(--text-1); font-weight: 600; }
.trust-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: var(--sp-4); }
.trust-item { position: relative; padding: var(--sp-5) var(--sp-4); border-radius: var(--r-lg); text-align: center;
  background: var(--bg-1); border: 1px solid var(--line-1); box-shadow: var(--edge-top); }
.trust .kpi-value { font-family: var(--font-display); font-weight: 600; font-size: clamp(2rem,1.3rem + 2.2vw,3rem);
  line-height: 1; letter-spacing: -.02em;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent; }
.trust .kpi-value em { font-style: normal; font-size: .55em; -webkit-text-fill-color: var(--accent); color: var(--accent); margin-left: 2px; }
.trust .kpi-label { margin-top: var(--sp-3); font-size: var(--fs-sm); color: var(--text-2); }

/* 冷启动价值点卡（修改①：无真实量时展示语义清晰的卖点，不出现孤立大数字） */
.value-props { display: grid; grid-template-columns: repeat(4,1fr); gap: var(--sp-4); }
.vp-card { display: flex; flex-direction: column; gap: var(--sp-3); text-align: left;
  padding: var(--sp-5); border-radius: var(--r-lg); background: var(--bg-1); border: 1px solid var(--line-1); box-shadow: var(--edge-top); }
.vp-ico { width: 40px; height: 40px; flex: none; display: grid; place-items: center; border-radius: var(--r-md);
  color: var(--accent); background: var(--accent-dim); border: 1px solid rgba(53,230,219,.24); }
.vp-ico svg { display: block; }
.vp-card h3 { font-size: var(--fs-md); font-weight: 600; color: var(--text-1); }
.vp-card p { font-size: var(--fs-sm); color: var(--text-2); line-height: var(--lh-base); }

.marquee { position: relative; margin-top: var(--sp-8); overflow: hidden;
  -webkit-mask: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
          mask: linear-gradient(90deg, transparent, black 8%, black 92%, transparent); }
.marquee-track { display: flex; gap: var(--sp-8); width: max-content; animation: marquee 34s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.m-logo { font-family: var(--font-display); font-weight: 500; font-size: var(--fs-lg); color: var(--text-3);
  white-space: nowrap; transition: color var(--t-base); }
.marquee:hover .m-logo { color: var(--text-2); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ============================================================
   模型广场 bento（非对称：一大四小 + 更多卡）
   ============================================================ */
.bento { display: grid; grid-template-columns: repeat(4,1fr); grid-auto-rows: 1fr; gap: var(--sp-4); }
.bento .card { padding: var(--sp-5); }
.b-lg { grid-column: span 2; grid-row: span 2; padding: var(--sp-6); }
.b-sm { grid-column: span 2; }
@media (min-width: 900px) { .b-sm { grid-column: span 1; } }
.bento .model-head { margin-bottom: var(--sp-4); }
.bento .card.more { align-items: flex-start; justify-content: center; gap: var(--sp-2); color: var(--brand-strong); font-weight: 600;
  background: linear-gradient(135deg, var(--brand-dim), transparent); }
.bento .card.more:hover { color: var(--accent-strong); }

.mod-thumb { width: 56px; height: 56px; border-radius: var(--r-md); object-fit: cover; margin-bottom: var(--sp-4);
  background: var(--bg-2); border: 1px solid var(--line-1); }
/* 修改②：厂商 LOGO 透明底 → 加浅色圆角底片，深色 logo（如 openai 黑）清晰可见 */
.mod-thumb.thumb-vendor { object-fit: contain; padding: 10px; background: rgba(255,255,255,.92); border: 1px solid var(--line-1); }
.b-lg .mod-thumb { width: 64px; height: 64px; }
.bento .model-name { margin-bottom: var(--sp-2); }
.b-lg .model-name { font-size: var(--fs-lg); }
.bento .model-desc { margin-bottom: var(--sp-4); }
.spark { margin: var(--sp-4) 0; height: 56px; }
.spark svg { display: block; width: 100%; height: 100%; overflow: visible; }
.spark polyline { filter: drop-shadow(0 0 6px rgba(53,230,219,.5)); }

/* ============================================================
   协议接入演示（左论点 + 右 radio-hack 代码窗，零 JS）
   ============================================================ */
.proto { display: grid; grid-template-columns: minmax(0,.85fr) minmax(0,1.15fr); gap: clamp(28px,4vw,64px); align-items: start; }
.proto-points { display: flex; flex-direction: column; gap: var(--sp-5); }
.proto-points .section-head { margin-bottom: var(--sp-2); }
.point { display: flex; gap: var(--sp-4); align-items: flex-start; }
.p-ico { flex: none; width: 44px; height: 44px; display: grid; place-items: center; border-radius: var(--r-md);
  color: var(--accent); background: var(--accent-dim); border: 1px solid rgba(53,230,219,.24); }
.p-ico svg { display: block; }
.point h3 { font-size: var(--fs-md); margin-bottom: var(--sp-1); }
.point p { font-size: var(--fs-sm); color: var(--text-2); line-height: var(--lh-base); }

.codewin { position: relative; border-radius: var(--r-xl); overflow: hidden; background: var(--bg-1);
  border: 1px solid var(--line-1); box-shadow: var(--shadow-2), var(--edge-top); }
.codewin input[type=radio] { position: absolute; opacity: 0; pointer-events: none; }
.tabs { display: flex; gap: var(--sp-1); padding: var(--sp-3) var(--sp-3) 0; background: var(--bg-2); border-bottom: 1px solid var(--line-1); overflow-x: auto; }
.tabs label { padding: var(--sp-3) var(--sp-4); border-radius: var(--r-sm) var(--r-sm) 0 0; font-size: var(--fs-sm);
  font-weight: 600; color: var(--text-3); cursor: pointer; white-space: nowrap;
  transition: color var(--t-base), background var(--t-base); border-bottom: 2px solid transparent; }
.tabs label:hover { color: var(--text-2); }
.codewin .panel { display: none; }
#pt-1:checked ~ .tabs label[for=pt-1],
#pt-2:checked ~ .tabs label[for=pt-2],
#pt-3:checked ~ .tabs label[for=pt-3] { color: var(--text-1); border-bottom-color: var(--accent); background: linear-gradient(180deg, var(--accent-dim), transparent); }
#pt-1:checked ~ .panel-1, #pt-2:checked ~ .panel-2, #pt-3:checked ~ .panel-3 { display: block; }
.codewin pre { min-height: 300px; }

/* ============================================================
   渠道容错示意
   ============================================================ */
.flow-card { position: relative; padding: var(--sp-7) var(--sp-5) var(--sp-6); border-radius: var(--r-xl);
  background: radial-gradient(120% 120% at 50% 0%, rgba(91,140,255,.06), transparent 60%), var(--bg-1);
  border: 1px solid var(--line-1); box-shadow: var(--edge-top); overflow: hidden; }
.flow-card svg { display: block; width: 100%; height: auto; }
.flow-cap { margin-top: var(--sp-5); text-align: center; font-size: var(--fs-sm); color: var(--text-2);
  max-width: 56em; margin-inline: auto; line-height: var(--lh-base); }
.flow-dot { filter: drop-shadow(0 0 8px rgba(91,140,255,.9)); animation: flow-run 3.4s var(--ease-io) infinite; }
@keyframes flow-run { 0% { offset-distance: 0%; opacity: 0; } 8% { opacity: 1; } 92% { opacity: 1; } 100% { offset-distance: 100%; opacity: 0; } }

/* ============================================================
   FAQ 手风琴（原生 details，零 JS）
   ============================================================ */
.faq { max-width: 820px; margin-inline: auto; }
.faq details { border: 1px solid var(--line-1); border-radius: var(--r-md); margin-bottom: var(--sp-3);
  background: var(--bg-1); overflow: hidden; transition: border-color var(--t-base); }
.faq details[open] { border-color: var(--line-glow); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4);
  padding: var(--sp-5); font-size: var(--fs-md); font-weight: 600; color: var(--text-1); cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .chev { flex: none; color: var(--text-3); transition: transform var(--t-base), color var(--t-base); }
.faq details[open] summary .chev { transform: rotate(180deg); color: var(--accent); }
.faq .faq-a { padding: 0 var(--sp-5) var(--sp-5); color: var(--text-2); line-height: var(--lh-base); font-size: var(--fs-base); }

/* ============================================================
   末屏 CTA（cta-glow 极光地平线）
   ============================================================ */
.cta { position: relative; isolation: isolate; overflow: hidden; text-align: center;
  padding-block: clamp(80px,12vw,180px); background: var(--bg-void); }
.cta-bg { position: absolute; inset: 0; z-index: -1; }
.cta-bg img { position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: min(1280px,150%); height: auto; max-width: none; opacity: .9; }
.cta::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(0deg, transparent 30%, var(--bg-0)); pointer-events: none; }
.cta h2 { font-family: var(--font-display); font-size: var(--fs-2xl); letter-spacing: var(--ls-tight); margin-bottom: var(--sp-4); }
.cta p { color: var(--text-2); font-size: var(--fs-md); margin-bottom: var(--sp-7); }
.cta .btn { margin-inline: auto; }

/* ============================================================
   首页响应式
   ============================================================ */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero .term { transform: none; max-width: 620px; }
  .hero-bg img { opacity: .55; right: -20%; }
  .proto { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .bento { grid-template-columns: repeat(2,1fr); }
  .b-lg { grid-column: span 2; grid-row: span 1; }
  .b-sm { grid-column: span 1; }
  .trust-grid, .value-props { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 560px) {
  .bento { grid-template-columns: 1fr; }
  .b-lg, .b-sm { grid-column: span 1; }
  .trust-grid, .value-props { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { flex: 1; }
}

/* ---------- prefers-reduced-motion：停掉「位移冲击型」动效，
   但保留品牌氛围动效（厂商 logo 横向滚动 + hero 光晕漂移）——站主明确要求，
   横向匀速滚动/缓慢模糊漂移属轻柔无害动效。加载在 main.css 之后，用高特异性 !important 覆盖其全局降级。 */
@media (prefers-reduced-motion: reduce) {
  .flow-dot, .badge .dot { animation: none !important; }
  .hero .term { transform: none !important; }
  .marquee-track { animation: marquee 34s linear infinite !important; }
  .aura { animation: aura-drift 22s var(--ease-io) infinite alternate !important; }
}