/* ==========================================================
 * 文件: quant-ai-dark/landing-story.css
 * 版本: 0.3.0 · 更新: 2026-10-23 · 作者: Claude（为李泓锐）
 * 用途: 落地页 v2 —— Tesla / SpaceX / xAI 式 9 屏 scroll storytelling。
 *       只给 landing.html 用：字体（Satoshi / General Sans / Inter / Geist Mono）、
 *       全屏 section、右侧滚动指示器、Hero 排版与入场节奏。
 * 节奏: 入场 300ms expo-out · 错开 150ms · 吸附 800ms · hover 200ms（不用 ease / linear）
 * ========================================================== */

/* Geist Mono：固定版本的 npm 包（原指令里的 @latest .otf 路径不存在，见 DECISIONS ADR-016） */
@font-face {
  font-family: "Geist Mono";
  src: url("https://cdn.jsdelivr.net/npm/geist@1.8.2/dist/fonts/geist-mono/GeistMono-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

.story-page {
  --font-display: "Satoshi", "Inter", -apple-system, "PingFang SC", sans-serif;
  --font-heading: "General Sans", "Inter", -apple-system, "PingFang SC", sans-serif;
  --font-body: "Inter", -apple-system, "PingFang SC", "Noto Sans SC", sans-serif;
  --font-num: "Geist Mono", "SF Mono", ui-monospace, monospace;
  --font-zh: "PingFang SC", "Noto Sans SC", "Noto Sans CJK SC", sans-serif;

  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-snap: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-hover: cubic-bezier(0.4, 0, 0.2, 1);
  --enter: 300ms;
  --stagger: 150ms;
  --hover: 200ms;

  /* 只有一个强调色；白字三档 100 / 60 / 40（40 只用于装饰与提示，不承载正文） */
  --ink: #ffffff;
  --ink-2: rgba(255, 255, 255, 0.6);
  --ink-3: rgba(255, 255, 255, 0.4);
  /* 强调色跟随用户的蓝色参考图：冰蓝 #8fb8ff（变量名保留 violet，避免改动所有引用） */
  --violet: #8fb8ff;
  --violet-deep: #3d6bff;
  --blue: #3d6bff;

  font-family: var(--font-body);
  font-size: 17px;
  letter-spacing: -0.011em;
  color: var(--ink);
  /* 深海蓝：参考图的蓝色氛围；上方略亮、下方沉下去 */
  /* 往下滑的各屏：深蓝 → 近黑（用户指定） */
  background: linear-gradient(180deg, #050b2c 0%, #030617 100%) fixed #030617;
}

/* 浅色模式下落地页仍保持深色：这是品牌页，不跟随主题（见 ADR-017） */
.story-page::before { display: none; }

/* —— 滚动：用户要求自由滚动、想停哪就停哪，不再逐屏吸附（2026-10-23） —— */
html:has(.story-page) {
  scroll-snap-type: none;
}

/* ================= 顶栏：极简 ================= */
.story-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
  padding: 0 clamp(20px, 4vw, 56px);
  font-size: 13px;
  letter-spacing: 0;
}

.story-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.story-nav__mark {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff, var(--violet) 45%, var(--violet-deep) 80%);
  box-shadow: 0 0 18px rgba(143, 184, 255, 0.7);
}

.story-nav__links {
  display: none;
  gap: 4px;
  margin: 0 auto;
}

.story-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink-2);
  transition: color var(--hover) var(--ease-hover);
}

.story-nav__link:hover { color: var(--ink); }
.story-nav__link[aria-current="page"] { color: #fff; box-shadow: inset 0 -1px 0 #fff; }

.story-nav__globe {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-left: auto;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--hover) var(--ease-hover);
}

.story-nav__globe:hover { color: #fff; }
.story-nav__globe-icon { width: 18px; height: 18px; }

/* ================= 右侧 9 点指示器 ================= */
.story-dots {
  position: fixed;
  top: 50%;
  right: clamp(12px, 2vw, 32px);
  z-index: 50;
  display: none;
  flex-direction: column;
  gap: 2px;
  transform: translateY(-50%);
  list-style: none;
  padding: 0;
}

.story-dots__btn {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
}

.story-dots__btn::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid var(--ink-3);
  transition: transform var(--enter) var(--ease-expo), background var(--enter) var(--ease-expo),
    border-color var(--enter) var(--ease-expo), box-shadow var(--enter) var(--ease-expo);
}

.story-dots__btn:hover::before { border-color: var(--ink); }

.story-dots__btn[aria-current="true"]::before {
  border-color: var(--violet);
  background: var(--violet);
  box-shadow: 0 0 12px var(--violet);
  transform: scale(1.6);
}

/* ================= 全屏 section ================= */
.story {
  position: relative;
  display: grid;
  align-items: center;
  height: 100vh;
  height: 100svh;
  min-height: 560px;
  padding: 12vh clamp(20px, 6vw, 96px);
  overflow: hidden;
  isolation: isolate;
}

.story__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}

.story__index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.story__title {
  margin-top: 20px;
  max-width: 14ch;
  font-family: var(--font-display);
  font-size: clamp(44px, 7.2vw, 120px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.92;
}

.story__title--md {
  max-width: 16ch;
  font-size: clamp(36px, 5.2vw, 88px);
}

.story__title-line { display: block; }

.story__sub {
  max-width: 34em;
  margin-top: 32px;
  font-size: clamp(16px, 1.25vw, 18px);
  line-height: 1.6;
  color: var(--ink-2);
}

/* 中文：PingFang 800，字距放松一些 */
html[lang="zh-CN"] .story__title {
  font-family: var(--font-zh);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  max-width: 11em;
  font-size: clamp(34px, 5vw, 96px);
  word-break: keep-all;
}

html[lang="zh-CN"] .story-page { letter-spacing: 0; }

/* 占位的 3D 焦点（骨架阶段） */
.story__stage {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.story__placeholder {
  display: grid;
  place-items: center;
  width: min(42vmin, 420px);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px dashed rgba(143, 184, 255, 0.35);
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--ink-3);
  text-align: center;
}

/* 每屏背景：极淡的紫色光，90% 都是深色 */
.story::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(60% 50% at 50% 50%, rgba(61, 107, 255, 0.08), transparent 70%);
}

/* ================= 入场节奏：section 激活时子元素依次出现 ================= */
.js .story [data-enter] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--enter) var(--ease-expo), transform calc(var(--enter) * 2.2) var(--ease-expo);
  transition-delay: calc(var(--n, 0) * var(--stagger));
}

.js .story.is-active [data-enter] {
  opacity: 1;
  transform: none;
}

/* 第 1 屏样式在 landing-hero.css；这里只留其他屏共用的按钮组 */
.hero-v2__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 48px;
}

/* 主按钮：白底黑字（Tesla / xAI 的克制），shimmer 光带用紫 */
.cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 28px;
  border-radius: 999px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  overflow: hidden;
  isolation: isolate;
  transition: box-shadow var(--hover) var(--ease-hover), background var(--hover) var(--ease-hover),
    border-color var(--hover) var(--ease-hover);
}

.cta--primary {
  color: #06051a;
  background: var(--ink);
}

.cta--primary:hover { box-shadow: 0 0 0 6px rgba(143, 184, 255, 0.18), 0 0 40px rgba(143, 184, 255, 0.45); }

.cta--primary::after {
  content: "";
  position: absolute;
  inset: -40% auto -40% -40%;
  z-index: -1;
  width: 30%;
  background: linear-gradient(100deg, transparent, rgba(143, 184, 255, 0.45), transparent);
  transform: translateX(0) skewX(-20deg);
  animation: cta-shimmer 3.2s var(--ease-snap) infinite;
}

.cta--primary:hover::after { animation-duration: 1.4s; }

@keyframes cta-shimmer {
  0% { transform: translateX(0) skewX(-20deg); }
  55%, 100% { transform: translateX(560%) skewX(-20deg); }
}

/* 次按钮：发光描边 */
.cta--ghost {
  color: var(--ink);
  border: 1px solid rgba(143, 184, 255, 0.45);
  background: rgba(61, 107, 255, 0.06);
}

.cta--ghost:hover {
  border-color: var(--violet);
  box-shadow: 0 0 24px rgba(143, 184, 255, 0.35), inset 0 0 18px rgba(143, 184, 255, 0.15);
}

.cta__icon { width: 18px; height: 18px; }

/* 磁吸位移（shared/magnetic-hover.js 写 --mx/--my），回弹用 expo-out，不用弹簧 */
.story-page [data-magnetic] {
  transition: transform 600ms var(--ease-expo), box-shadow var(--hover) var(--ease-hover);
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: calc(72px + 3vh);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  transform: translateX(-50%);
}

.scroll-hint__line {
  position: relative;
  width: 1px;
  height: 40px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
}

.scroll-hint__line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent, var(--violet));
  transform: translateY(-100%);
  animation: hint-drop 2s var(--ease-snap) infinite;
}

@keyframes hint-drop {
  to { transform: translateY(100%); }
}

/* 页脚放在第 9 屏内部 */
.story-foot {
  position: absolute;
  inset: auto clamp(20px, 6vw, 96px) 4vh;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  color: var(--ink-3);
}

/* ================= 响应式 ================= */
@media (min-width: 1024px) {
  .story-nav__links { display: flex; }
  .story-dots { transition: opacity var(--enter) var(--ease-expo); }
  /* 第 1 屏照抄参考图，不显示右侧指示器；往下滑才出现 */
  html.at-hero .story-dots { opacity: 0; pointer-events: none; }
  .story-dots { display: flex; }
}

/* 手机：粒子球放到标题后面做背景，文字居下 */
@media (max-width: 767px) {
  .story { align-items: end; padding-bottom: 14vh; }
  .hero-v2__cta { margin-top: 32px; }
  .cta { flex: 1 1 auto; justify-content: center; }
  .scroll-hint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .js .story [data-enter] { opacity: 1; transform: none; }
}