/*
 * Mayhub 官网样式（紫外光紫品牌体系 v4）
 * 无彩基底 + 单一 UV 紫点缀；光晕呼吸为唯一发光动效；明暗双主题。
 * 现代化高级感：滚动揭示 · 视差光晕 · 卡片微交互 · 网格背景。
 */

:root {
  --mh-bg: #0a0a10;
  --mh-bg-2: #0d0d16;
  --mh-panel: #12121a;
  --mh-panel-2: #16161f;
  --mh-text: #f2f3f7;
  --mh-text-2: #9a9db0;
  --mh-text-3: #6b6e80;
  --mh-line: #ffffff14;
  --mh-line-2: #ffffff0a;
  --mh-accent: #a493ff;
  --mh-accent-strong: #7c5cff;
  --mh-accent-soft: #7c5cff29;
  --mh-accent-glow: #7c5cff;
  --mh-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
  --container: 1080px;
  --radius: 18px;
}

:root[data-theme="light"] {
  --mh-bg: #fafafc;
  --mh-bg-2: #f4f4f8;
  --mh-panel: #ffffff;
  --mh-panel-2: #f6f6fb;
  --mh-text: #17181d;
  --mh-text-2: #5a5d6b;
  --mh-text-3: #8a8d9b;
  --mh-line: #0000000f;
  --mh-line-2: #00000006;
  --mh-accent: #6247e5;
  --mh-accent-strong: #6247e5;
  --mh-accent-soft: #6247e514;
  --mh-accent-glow: #6247e5;
  --mh-shadow: 0 24px 60px -24px rgba(40, 30, 90, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  font-family:
    "Segoe UI Variable", "Segoe UI", "PingFang SC", "Microsoft YaHei UI",
    "Microsoft YaHei", system-ui, sans-serif;
  background: var(--mh-bg);
  color: var(--mh-text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

a {
  color: inherit;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--mh-accent-strong);
  z-index: 100;
  box-shadow: 0 0 12px var(--mh-accent-strong);
  transition: width 0.1s linear;
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--mh-bg) 80%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--mh-line);
  transition: border-color 0.3s, background 0.3s;
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 60px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
  justify-self: start;
}

.brand img {
  border-radius: 50%;
  box-shadow: 0 0 14px var(--mh-accent-soft);
}

.brand-name {
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1.05rem;
}

.brand-cn {
  font-size: 0.76rem;
  color: var(--mh-text-3);
  letter-spacing: 0.05em;
}

.header-nav {
  display: flex;
  gap: 4px;
  justify-self: center;
}

.header-nav a {
  text-decoration: none;
  color: var(--mh-text-2);
  font-size: 0.86rem;
  padding: 7px 12px;
  border-radius: 999px;
  transition: color 0.2s, background 0.2s;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--mh-text);
  background: var(--mh-line);
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
  justify-self: end;
}

.ghost-btn {
  min-width: 40px;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--mh-line);
  border-radius: 999px;
  background: transparent;
  color: var(--mh-text-2);
  font-size: 0.8rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: filter 0.18s, color 0.18s, box-shadow 0.18s, border-color 0.18s;
}

.ghost-btn:hover {
  filter: brightness(1.15);
  color: var(--mh-accent-strong);
  border-color: var(--mh-accent-soft);
  box-shadow: 0 0 14px var(--mh-accent-soft);
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0 10px;
}
.menu-btn span {
  width: 16px;
  height: 1.5px;
  background: var(--mh-text-2);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.menu-btn[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.menu-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.menu-btn[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid var(--mh-line);
  background: var(--mh-panel);
  color: var(--mh-text);
  text-decoration: none;
  font-size: 0.92rem;
  transition: filter 0.18s, box-shadow 0.18s, transform 0.18s, border-color 0.18s;
}

.btn:hover {
  filter: brightness(1.12);
  box-shadow: 0 0 20px var(--mh-accent-soft);
  border-color: var(--mh-accent-soft);
}

.btn.primary {
  background: var(--mh-accent-strong);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 10px 30px -10px var(--mh-accent-strong);
}

.btn.primary:hover {
  box-shadow: 0 14px 40px -8px var(--mh-accent-strong);
}

.btn.sm {
  min-height: 34px;
  padding: 0 16px;
  font-size: 0.82rem;
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  padding: 120px 0 90px;
  text-align: center;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--mh-line-2) 1px, transparent 1px),
    linear-gradient(90deg, var(--mh-line-2) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 35%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 35%, #000 30%, transparent 75%);
  pointer-events: none;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  top: 46%;
  left: 50%;
  width: 760px;
  height: 760px;
  max-width: 130vw;
  transform: translate(-50%, -50%) scale(1.04);
  background: radial-gradient(
    circle,
    var(--mh-accent-soft) 0%,
    transparent 64%
  );
  pointer-events: none;
  filter: blur(34px);
  animation: glowBreath 9s ease-in-out infinite;
}

/* 仅呼吸透明度；位移交给 JS（随光标轻微游移），二者互不覆盖 */
@keyframes glowBreath {
  0%, 100% { opacity: 0.40; }
  50% { opacity: 0.62; }
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-kicker {
  margin: 0 0 18px;
  font-size: 0.78rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--mh-accent);
}

.hero-title {
  margin: 0;
  font-size: clamp(2.4rem, 6.5vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.08;
  background: linear-gradient(180deg, var(--mh-text), color-mix(in srgb, var(--mh-text) 60%, var(--mh-accent-strong)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* 中文全称：放宽字距、收敛字重，更克制 */
.hero-title:lang(zh-CN) {
  letter-spacing: 0.08em;
}

.hero-kicker:lang(zh-CN) {
  letter-spacing: 0.28em;
}

.hero-manifesto {
  max-width: 660px;
  margin: 26px auto 0;
  font-size: clamp(1rem, 2.4vw, 1.22rem);
  line-height: 1.85;
  color: var(--mh-text-2);
  font-weight: 400;
  white-space: pre-line;
}

/* 亮点描述：技术定位，承接品牌宣言，强调色点睛 */
.hero-lead {
  max-width: 620px;
  margin: 14px auto 0;
  font-size: clamp(0.92rem, 1.8vw, 1.05rem);
  line-height: 1.7;
  color: var(--mh-accent);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 30px;
}

.hero-highlights .hl {
  font-size: 0.84rem;
  color: var(--mh-text-2);
  padding: 8px 16px;
  border: 1px solid var(--mh-line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--mh-panel) 45%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  letter-spacing: 0.02em;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-top: 38px;
}

.hero-moat {
  margin: 32px auto 0;
  max-width: 620px;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--mh-text-3);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  max-width: 680px;
  margin: 46px auto 0;
  padding-top: 30px;
  border-top: 1px solid var(--mh-line);
}

.stat-num {
  display: block;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  font-weight: 700;
  color: var(--mh-text);
  letter-spacing: 0.01em;
}

.stat-label {
  font-size: 0.74rem;
  color: var(--mh-text-3);
  letter-spacing: 0.04em;
}

.scroll-hint {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 38px;
  border: 1px solid var(--mh-line);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 7px;
  z-index: 1;
}
.scroll-hint span {
  width: 3px;
  height: 8px;
  border-radius: 2px;
  background: var(--mh-accent-strong);
  animation: scrolldot 1.8s ease-in-out infinite;
}
@keyframes scrolldot {
  0% { opacity: 0; transform: translateY(0); }
  40% { opacity: 1; }
  100% { opacity: 0; transform: translateY(10px); }
}

/* ---------- 通用 section ---------- */
.section {
  padding: 96px 0;
  position: relative;
}

.section.band {
  background:
    radial-gradient(ellipse 50% 60% at 50% 0%, var(--mh-accent-soft), transparent 70%),
    var(--mh-bg-2);
  border-top: 1px solid var(--mh-line);
  border-bottom: 1px solid var(--mh-line);
}

.section-kicker {
  margin: 0 0 14px;
  font-size: 0.74rem;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--mh-accent);
}

.section-title {
  margin: 0;
  font-size: clamp(1.6rem, 4.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.25;
  max-width: 18em;
}

.section-lead {
  margin: 18px 0 0;
  max-width: 60ch;
  color: var(--mh-text-2);
  font-size: 1.02rem;
}

/* ---------- 愿景三柱 ---------- */
.triad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.triad-card {
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 26px 24px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.triad-card::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -30%;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, var(--mh-accent-soft), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
}

.triad-card:hover {
  border-color: var(--mh-accent-soft);
  transform: translateY(-4px);
  box-shadow: var(--mh-shadow);
}
.triad-card:hover::before { opacity: 1; }

.triad-index {
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--mh-accent);
  font-weight: 700;
}

.triad-card h3 {
  margin: 10px 0 8px;
  font-size: 1.1rem;
}

.triad-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--mh-text-2);
}

.big-quote {
  margin: 56px 0 0;
  text-align: center;
  font-size: clamp(1.2rem, 3.2vw, 1.7rem);
  font-weight: 500;
  line-height: 1.6;
  color: var(--mh-text-2);
}

.big-quote strong {
  color: var(--mh-accent-strong);
  font-weight: 700;
}

/* ---------- 空间容器示意 ---------- */
.container-viz {
  margin: 54px auto 0;
  max-width: 760px;
}

.viz-frame {
  position: relative;
  border: 1px dashed color-mix(in srgb, var(--mh-accent-strong) 40%, var(--mh-line));
  border-radius: 26px;
  background:
    radial-gradient(ellipse at 50% 40%, var(--mh-accent-soft), transparent 65%),
    var(--mh-panel);
  padding: 40px;
  min-height: 320px;
  display: grid;
  place-items: center;
}

.viz-core {
  text-align: center;
  z-index: 2;
}
.viz-core-label {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--mh-accent-strong);
  border: 1px solid var(--mh-accent-soft);
  border-radius: 999px;
  padding: 8px 22px;
  background: color-mix(in srgb, var(--mh-accent-strong) 10%, transparent);
  box-shadow: 0 0 24px var(--mh-accent-soft);
}
.viz-core-sub {
  display: block;
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--mh-text-3);
  letter-spacing: 0.05em;
}

.viz-chip {
  position: absolute;
  font-size: 0.78rem;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--mh-line);
  background: var(--mh-bg);
  color: var(--mh-text-2);
  white-space: nowrap;
  animation: floaty 7s ease-in-out infinite;
}
.viz-chip.c1 { top: 14%; left: 6%; }
.viz-chip.c2 { top: 22%; right: 8%; animation-delay: -1.2s; }
.viz-chip.c3 { bottom: 26%; left: 10%; animation-delay: -2.4s; }
.viz-chip.c4 { bottom: 16%; right: 12%; animation-delay: -3.6s; }
.viz-chip.c5 { top: 50%; left: 2%; animation-delay: -1.8s; }
.viz-chip.c6 { top: 46%; right: 3%; animation-delay: -3s; }
.viz-chip.c7 { bottom: 6%; left: 42%; animation-delay: -4.4s; }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 三支柱 ---------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.pillar {
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 24px;
  transition: border-color 0.25s, transform 0.25s;
}
.pillar:hover { border-color: var(--mh-accent-soft); transform: translateY(-3px); }
.pillar h3 { margin: 0 0 10px; font-size: 1.02rem; color: var(--mh-accent); }
.pillar p { margin: 0; font-size: 0.88rem; color: var(--mh-text-2); }

/* ---------- 纯净承诺 ---------- */
.promise {
  margin-top: 40px;
  border: 1px solid var(--mh-line);
  border-left: 2px solid var(--mh-accent-strong);
  border-radius: 12px;
  padding: 22px 24px;
  background: var(--mh-panel);
}
.promise-tag {
  display: inline-block;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--mh-accent-strong);
  font-weight: 700;
  margin-bottom: 8px;
}
.promise p { margin: 0; font-size: 0.92rem; color: var(--mh-text-2); }

/* ---------- 能力卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.card {
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 24px 22px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.card:hover {
  border-color: var(--mh-accent-soft);
  transform: translateY(-4px);
  box-shadow: var(--mh-shadow);
}
.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  color: var(--mh-accent-strong);
  background: var(--mh-accent-soft);
  margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 1rem; }
.card p { margin: 0; font-size: 0.85rem; color: var(--mh-text-2); line-height: 1.6; }

/* ---------- Context Engine 流程 ---------- */
.flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 48px;
  flex-wrap: wrap;
}
.flow-step {
  flex: 1 1 200px;
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 24px;
  transition: border-color 0.25s, transform 0.25s;
}
.flow-step:hover { border-color: var(--mh-accent-soft); transform: translateY(-3px); }
.flow-tag {
  display: inline-block;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mh-accent-strong);
  font-weight: 700;
  margin-bottom: 10px;
}
.flow-step p { margin: 0; font-size: 0.86rem; color: var(--mh-text-2); }
.flow-arrow {
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  color: var(--mh-accent);
  padding: 0 6px;
}

.neural {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 18px;
}
.neural-item {
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 24px;
  text-align: center;
  transition: border-color 0.25s, transform 0.25s;
}
.neural-item:hover { border-color: var(--mh-accent-soft); transform: translateY(-3px); }
.neural-icon {
  font-size: 1.6rem;
  filter: drop-shadow(0 0 10px var(--mh-accent-soft));
}
.neural-item strong { display: block; margin: 10px 0 8px; font-size: 1.02rem; color: var(--mh-text); }
.neural-item p { margin: 0; font-size: 0.85rem; color: var(--mh-text-2); }

.memory {
  margin-top: 36px;
  text-align: center;
}
.memory-label {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--mh-text-3);
}
.memory-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 14px;
}
.memory-chips span {
  font-size: 0.84rem;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--mh-line);
  background: var(--mh-panel);
  color: var(--mh-text-2);
}

/* ---------- 生态双轨 ---------- */
.dual {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  margin-top: 48px;
}
.dual-col {
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 28px;
  transition: border-color 0.25s, transform 0.25s;
}
.dual-col:hover { border-color: var(--mh-accent-soft); transform: translateY(-3px); }
.dual-col h3 { margin: 0 0 10px; font-size: 1.05rem; color: var(--mh-accent); }
.dual-col p { margin: 0; font-size: 0.9rem; color: var(--mh-text-2); }
.dual-connect {
  width: 2px;
  height: 60px;
  background: linear-gradient(var(--mh-accent-strong), transparent);
  position: relative;
}
.dual-connect::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--mh-accent-strong);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 16px var(--mh-accent-strong);
}
.eco-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 32px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--mh-accent-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--mh-accent-soft);
  padding-bottom: 2px;
  transition: filter 0.18s;
}
.eco-link:hover { filter: brightness(1.2); }

/* ---------- 隐私光谱 / 层 ---------- */
.spectrum {
  margin-top: 48px;
  text-align: center;
}
.spectrum-title {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--mh-text-3);
}
.spectrum-bar {
  display: flex;
  margin-top: 14px;
  border: 1px solid var(--mh-line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--mh-panel);
}
.spectrum-bar span {
  flex: 1;
  padding: 14px 0;
  font-weight: 700;
  color: var(--mh-text-2);
  border-right: 1px solid var(--mh-line-2);
  position: relative;
  transition: color 0.25s, background 0.25s;
}
.spectrum-bar span:last-child { border-right: none; }
.spectrum-bar span:hover { color: var(--mh-accent-strong); background: var(--mh-accent-soft); }
.spectrum-bar span small {
  display: block;
  font-weight: 400;
  font-size: 0.72rem;
  color: var(--mh-text-3);
}

.layers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 32px;
}
.layer {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 20px 22px;
  transition: border-color 0.25s, transform 0.25s;
}
.layer:hover { border-color: var(--mh-accent-soft); transform: translateY(-3px); }
.layer span {
  flex-shrink: 0;
  font-weight: 700;
  color: var(--mh-accent-strong);
  font-size: 0.9rem;
  border: 1px solid var(--mh-accent-soft);
  border-radius: 8px;
  padding: 4px 8px;
  background: var(--mh-accent-soft);
}
.layer p { margin: 0; font-size: 0.85rem; color: var(--mh-text-2); }

.compliance {
  margin-top: 32px;
  border: 1px solid var(--mh-line);
  border-left: 2px solid var(--mh-accent-strong);
  border-radius: 12px;
  padding: 22px 24px;
  background: var(--mh-panel);
}
.compliance-tag {
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--mh-accent-strong);
  font-weight: 700;
}
.compliance p { margin: 8px 0 0; font-size: 0.92rem; color: var(--mh-text-2); }

/* ---------- 时间线 ---------- */
.timeline {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  counter-reset: step;
}
.timeline li {
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 22px 18px;
  position: relative;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.timeline li:hover {
  border-color: var(--mh-accent-soft);
  transform: translateY(-4px);
  box-shadow: var(--mh-shadow);
}
.tl-no {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--mh-accent-strong);
  border: 1px solid var(--mh-accent-soft);
  border-radius: 8px;
  padding: 3px 10px;
  background: var(--mh-accent-soft);
  margin-bottom: 12px;
}
.timeline h3 { margin: 0 0 6px; font-size: 0.98rem; }
.timeline p { margin: 0; font-size: 0.82rem; color: var(--mh-text-2); }

/* ---------- CTA ---------- */
.cta-section {
  text-align: center;
  background:
    radial-gradient(ellipse 60% 80% at 50% 50%, var(--mh-accent-soft), transparent 70%),
    var(--mh-bg-2);
  border-top: 1px solid var(--mh-line);
}
.cta-title {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
}
.cta-note {
  margin: 16px auto 0;
  max-width: 50ch;
  color: var(--mh-text-2);
}
.cta-section .hero-cta { margin-top: 32px; }
.dl-contact {
  margin-top: 26px;
  font-size: 0.9rem;
  color: var(--mh-text-3);
}
.dl-contact a { color: var(--mh-accent-strong); text-decoration: none; }
.dl-contact a:hover { text-decoration: underline; }

/* 下载区：版本行 + 历史版本列表（gitee releases API 动态渲染，折叠交互） */
button.btn { font-family: inherit; cursor: pointer; }
.dl-version {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--mh-text-3);
}
.dl-history {
  margin: 26px auto 0;
  max-width: 680px;
  text-align: left;
}
.dl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.dl-item {
  border: 1px solid var(--mh-line);
  border-radius: 12px;
  background: var(--mh-panel);
  overflow: hidden;
  font-size: 0.86rem;
}
.dl-ver > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
}
.dl-ver > summary::-webkit-details-marker { display: none; }
.dl-ver > summary::marker { content: ""; }
.dl-tag { font-weight: 600; }
.dl-badge {
  font-style: normal;
  font-size: 0.7rem;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--mh-accent-soft);
  color: var(--mh-accent-strong);
  vertical-align: middle;
}
.dl-date { color: var(--mh-text-3); font-size: 0.8rem; }
.dl-links { display: flex; gap: 14px; margin-left: auto; }
.dl-links a { color: var(--mh-accent-strong); text-decoration: none; white-space: nowrap; }
.dl-links a:hover { text-decoration: underline; }
.chev { color: var(--mh-text-3); font-size: 0.78rem; transition: transform 0.18s; }
.dl-ver[open] > summary .chev,
#dlHistoryBtn[aria-expanded="true"] .chev { transform: rotate(180deg); }

/* 版本描述（release changelog，markdown 轻渲染） */
.dl-body {
  padding: 12px 16px 14px;
  border-top: 1px dashed var(--mh-line);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--mh-text-2);
}
.dl-body h4 { margin: 0.7em 0 0.3em; font-size: 0.95rem; color: var(--mh-text); }
.dl-body h5 { margin: 0.6em 0 0.2em; font-size: 0.88rem; color: var(--mh-text); }
.dl-body p { margin: 0.35em 0; }
.dl-body ul { margin: 0.35em 0; padding-left: 1.3em; }
.dl-body li { margin: 0.18em 0; }
.dl-body blockquote {
  margin: 0.6em 0;
  padding: 6px 12px;
  border-left: 3px solid var(--mh-accent-strong);
  background: var(--mh-accent-soft);
  border-radius: 0 8px 8px 0;
  color: var(--mh-text-3);
}
.dl-body hr { border: 0; border-top: 1px solid var(--mh-line); margin: 0.9em 0; }
.dl-body code {
  background: var(--mh-bg-2);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}
.dl-body strong { color: var(--mh-text); }
.dl-body .dl-src { display: inline-block; margin-top: 8px; font-size: 0.8rem; color: var(--mh-accent-strong); text-decoration: none; }
.dl-body .dl-src:hover { text-decoration: underline; }

/* 键盘可达性：下载按钮与版本卡片可聚焦高亮 */
.btn:focus-visible,
.dl-ver > summary:focus-visible,
.header-nav a:focus-visible,
.dl-links a:focus-visible {
  outline: 2px solid var(--mh-accent-strong);
  outline-offset: 2px;
  border-radius: 6px;
}
.dl-ver > summary:focus-visible { outline-offset: -2px; border-radius: 0; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--mh-line);
  padding: 40px 0 56px;
  background: var(--mh-bg);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
}
.footer-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.footer-nav a {
  text-decoration: none;
  color: var(--mh-text-2);
  font-size: 0.86rem;
  transition: color 0.2s;
}
.footer-nav a:hover { color: var(--mh-accent-strong); }
.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--mh-text-3);
}
.beian {
  color: var(--mh-text-3);
  text-decoration: none;
  transition: color 0.2s;
}
.beian:hover { color: var(--mh-accent-strong); }

/* ---------- 滚动揭示 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-glow, .viz-chip, .scroll-hint span { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .triad, .pillars, .neural { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: repeat(2, 1fr); }
  .dual { grid-template-columns: 1fr; }
  .dual-connect { width: 60px; height: 2px; justify-self: center;
    background: linear-gradient(90deg, var(--mh-accent-strong), transparent); }
  .dual-connect::after { top: 50%; left: 50%; }
}

@media (max-width: 720px) {
  .header-inner { display: flex; justify-content: space-between; }
  .header-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--mh-bg);
    border-bottom: 1px solid var(--mh-line);
    padding: 8px 16px 16px;
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    margin-left: 0;
  }
  .header-nav.open { transform: translateY(0); }
  .header-nav a { padding: 12px 8px; border-radius: 10px; }
  .menu-btn { display: inline-flex; }
  .brand-cn { display: none; }
  .section { padding: 72px 0; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 24px 14px; }
  .layers { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); padding: 6px 0; }
}

/* ---------- 登录页（与首页共享顶/底栏） ---------- */
.login-main {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
}
.login-section { width: 100%; padding: 72px 0; }
.login-inner { max-width: 440px; text-align: center; }
.login-title { margin: 6px 0 0; font-size: clamp(1.6rem, 5vw, 2.2rem); font-weight: 700; }
.login-sub { margin: 10px 0 0; color: var(--mh-text-2); }
.device-banner {
  margin: 14px auto 0;
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--mh-accent-strong);
  background: var(--mh-accent-soft);
  border: 1px solid var(--mh-accent-soft);
}
.qr-card {
  margin: 36px auto 0;
  border: 1px solid var(--mh-line);
  border-radius: var(--radius);
  background: var(--mh-panel);
  padding: 28px;
  max-width: 300px;
}
.qr-frame {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto;
  border-radius: 14px;
  overflow: hidden;
  background: var(--mh-bg);
  display: grid;
  place-items: center;
}
.qr-img { width: 100%; height: 100%; object-fit: contain; display: block; }
.qr-mask {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--mh-panel) 88%, transparent);
  /* 默认隐藏（对齐 ac.yunjii.cn 的成熟做法）。
     注意：这里绝不能写 display:grid/flex —— 作者样式的 display 会压过
     HTML 的 hidden 属性（浏览器默认 [hidden]{display:none} 是 UA 样式），
     导致遮罩永远显示、盖住二维码。显隐一律由 JS 用行内 style.display 控制。 */
  display: none;
  place-items: center;
  backdrop-filter: blur(2px);
}
.qr-hint { margin: 16px 0 0; font-size: 0.86rem; color: var(--mh-text-2); }
.qr-status { margin: 6px 0 0; min-height: 1.2em; font-size: 0.82rem; color: var(--mh-accent-strong); }
.login-alt {
  display: inline-block;
  margin-top: 22px;
  font-size: 0.86rem;
  color: var(--mh-accent-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--mh-accent-soft);
  padding-bottom: 2px;
  cursor: pointer;
}
.login-alt:hover { filter: brightness(1.2); }
.user-chip { cursor: pointer; }