/* ===========================================================
   秒笔文生 · 品牌官网样式
   设计语言：深色沉浸 + 蓝紫渐变 + 青绿强调 + 流动光效
   =========================================================== */

:root {
  --bg-deep: #0a1628;
  --bg-deeper: #060f1d;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-strong: rgba(255, 255, 255, 0.06);

  --grad-from: #4a5bff;
  --grad-to: #7b3ff2;
  --accent: #00f5ff;
  --accent-soft: rgba(0, 245, 255, 0.18);

  --text-strong: #ffffff;
  --text: #e6ebf5;
  --text-muted: #9aa6bd;
  --text-faint: #67738b;

  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  --shadow-1: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 20px 60px rgba(74, 91, 255, 0.35);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 1200px;
  --section-py: clamp(72px, 9vw, 120px);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg-deep);
  color: var(--text);
  font-family: 'PingFang SC', 'Source Han Sans CN', 'Noto Sans SC', 'Microsoft YaHei',
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

a:hover {
  color: var(--accent);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

::selection {
  background: rgba(0, 245, 255, 0.35);
  color: #fff;
}

/* ---------- 全局背景光晕 ---------- */
body::before,
body::after {
  content: '';
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: 0;
}

body::before {
  top: -10%;
  left: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle at center, rgba(74, 91, 255, 0.35), transparent 60%);
  filter: blur(60px);
  animation: floatA 22s ease-in-out infinite;
}

body::after {
  bottom: -20%;
  right: -15%;
  width: 65vw;
  height: 65vw;
  background: radial-gradient(circle at center, rgba(123, 63, 242, 0.3), transparent 60%);
  filter: blur(70px);
  animation: floatB 26s ease-in-out infinite;
}

@keyframes floatA {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(6vw, 4vw) scale(1.08);
  }
}

@keyframes floatB {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-5vw, -3vw) scale(1.05);
  }
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

section {
  position: relative;
  z-index: 1;
  padding: var(--section-py) 0;
}

.section-heading {
  text-align: center;
  margin-bottom: 56px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(0, 245, 255, 0.06);
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 800;
  color: var(--text-strong);
  margin: 0 0 14px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: clamp(15px, 1.5vw, 18px);
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

.gradient-text {
  background: linear-gradient(120deg, var(--grad-from), var(--grad-to), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease), color 0.25s var(--ease);
  position: relative;
  overflow: hidden;
  border: 1px solid transparent;
  white-space: nowrap;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(120deg, var(--grad-from), var(--grad-to));
  color: #fff;
  box-shadow: 0 12px 30px rgba(74, 91, 255, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 18px 40px rgba(123, 63, 242, 0.45);
  color: #fff;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, 0.35) 50%, transparent 100%);
  transform: translateX(-120%);
  transition: transform 0.6s var(--ease);
}

.btn-primary:hover::after {
  transform: translateX(120%);
}

.btn-accent {
  background: var(--accent);
  color: #001318;
  box-shadow: 0 12px 30px rgba(0, 245, 255, 0.28);
}

.btn-accent:hover {
  background: #61f9ff;
  color: #001318;
  box-shadow: 0 18px 40px rgba(0, 245, 255, 0.4);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-strong);
  color: var(--text);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(0, 245, 255, 0.5);
}

.btn-lg {
  padding: 16px 30px;
  font-size: 16px;
  border-radius: 14px;
}

.btn-block {
  width: 100%;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  overflow: visible;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  background: rgba(10, 22, 40, 0.7);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-strong);
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--grad-from), var(--grad-to));
  display: grid;
  place-items: center;
  box-shadow: 0 6px 18px rgba(74, 91, 255, 0.4);
}

.brand-mark svg {
  width: 18px;
  height: 18px;
  color: #fff;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--grad-from), var(--accent));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s var(--ease);
  border-radius: 2px;
}

.nav-menu a:hover,
.nav-menu a.is-active {
  color: var(--text-strong);
}

.nav-menu a:hover::after,
.nav-menu a.is-active::after {
  transform: scaleX(1);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: visible;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.04);
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text-strong);
  border-radius: 2px;
  position: relative;
  transition: all 0.3s var(--ease);
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--text-strong);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

.nav-toggle.is-open span {
  background: transparent;
}

.nav-toggle.is-open span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.is-open span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(80px, 11vw, 140px) 0 clamp(80px, 10vw, 120px);
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(60% 50% at 20% 20%, rgba(74, 91, 255, 0.35), transparent 70%),
    radial-gradient(50% 50% at 80% 30%, rgba(123, 63, 242, 0.3), transparent 70%),
    radial-gradient(70% 60% at 50% 100%, rgba(0, 245, 255, 0.18), transparent 70%);
  animation: heroShift 18s ease-in-out infinite alternate;
}

@keyframes heroShift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  100% {
    transform: translate3d(-2%, 2%, 0) scale(1.05);
  }
}

.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-particles span {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.9), rgba(0, 245, 255, 0));
  opacity: 0.6;
  animation: floatParticle linear infinite;
}

@keyframes floatParticle {
  0% {
    transform: translateY(20px);
    opacity: 0;
  }
  10% {
    opacity: 0.8;
  }
  90% {
    opacity: 0.8;
  }
  100% {
    transform: translateY(-120vh);
    opacity: 0;
  }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-strong);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent);
  animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

.hero h1 {
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1.1;
  font-weight: 800;
  color: var(--text-strong);
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}

.hero .subtitle {
  font-size: clamp(15px, 1.6vw, 19px);
  color: var(--text-muted);
  margin: 0 auto 36px;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
  padding: 28px 36px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  max-width: 760px;
  margin: 0 auto;
}

.hero-stat {
  text-align: center;
}

.hero-stat-num {
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: 800;
  color: var(--text-strong);
  letter-spacing: -0.01em;
}

.hero-stat-num .gradient-text {
  background: linear-gradient(120deg, var(--accent), var(--grad-from));
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- 功能 Bento Grid ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.bento-card {
  position: relative;
  padding: 30px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}

.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(74, 91, 255, 0.6), rgba(0, 245, 255, 0));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-1);
}

.bento-card:hover::before {
  opacity: 1;
}

.bento-card.lg {
  grid-column: span 4;
}

.bento-card.md {
  grid-column: span 3;
}

.bento-card.sm {
  grid-column: span 2;
}

.bento-card-icon {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(74, 91, 255, 0.18), rgba(123, 63, 242, 0.18));
  border: 1px solid rgba(74, 91, 255, 0.3);
  color: var(--accent);
  margin-bottom: 18px;
}

.bento-card-icon svg {
  width: 24px;
  height: 24px;
}

.bento-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-strong);
}

.bento-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

.bento-card .tag {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(0, 245, 255, 0.1);
  border: 1px solid rgba(0, 245, 255, 0.25);
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 场景区 ---------- */
.scenes {
  display: flex;
  flex-direction: column;
  gap: clamp(60px, 8vw, 100px);
}

.scene {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
}

.scene.reverse .scene-text {
  order: 2;
}

.scene-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.scene-text h3 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  color: var(--text-strong);
  margin: 0 0 16px;
  line-height: 1.25;
}

.scene-text p {
  color: var(--text-muted);
  font-size: 15.5px;
  margin: 0 0 18px;
}

.scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.scene-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text);
  font-size: 14.5px;
}

.scene-list li svg {
  flex: 0 0 auto;
  margin-top: 4px;
  color: var(--accent);
}

.scene-visual {
  position: relative;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(74, 91, 255, 0.18), rgba(10, 22, 40, 0.6));
  border: 1px solid var(--border-strong);
  padding: 28px;
  overflow: hidden;
  min-height: 280px;
  box-shadow: var(--shadow-1);
}

.scene-visual::after {
  content: '';
  position: absolute;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.18), transparent 70%);
  top: -60px;
  right: -80px;
  pointer-events: none;
}

.scene-mock {
  background: rgba(8, 16, 32, 0.85);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 18px 20px;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13.5px;
  color: var(--text);
  line-height: 1.8;
  position: relative;
}

.scene-mock-head {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

.scene-mock-head span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.scene-mock-head span:nth-child(1) {
  background: #ff5f56;
}
.scene-mock-head span:nth-child(2) {
  background: #ffbd2e;
}
.scene-mock-head span:nth-child(3) {
  background: #27c93f;
}

.scene-mock-line {
  display: flex;
  gap: 10px;
}

.scene-mock-line .who {
  color: var(--accent);
  flex: 0 0 auto;
}

.scene-mock-line.user .who {
  color: #c4b5fd;
}

.typing-caret {
  display: inline-block;
  width: 8px;
  height: 1.1em;
  background: var(--accent);
  vertical-align: -2px;
  margin-left: 4px;
  animation: caret 1s steps(2) infinite;
}

@keyframes caret {
  50% {
    opacity: 0;
  }
}

/* ---------- 下载区 ---------- */
.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.download-card {
  position: relative;
  padding: 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}

.download-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 245, 255, 0.35);
}

.download-card .platform {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}

.platform-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(74, 91, 255, 0.2), rgba(123, 63, 242, 0.2));
  border: 1px solid rgba(74, 91, 255, 0.3);
  display: grid;
  place-items: center;
  color: #fff;
}

.platform-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-strong);
}

.platform-sub {
  color: var(--text-muted);
  font-size: 13.5px;
  margin-top: 2px;
}

.download-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 24px 0;
  padding: 18px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
}

.download-meta-item .k {
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.download-meta-item .v {
  font-size: 14px;
  color: var(--text);
  font-weight: 600;
}

/* ---------- 社群 ---------- */
.community-card {
  position: relative;
  margin: 0 auto;
  max-width: 880px;
  padding: 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(74, 91, 255, 0.18), rgba(0, 245, 255, 0.06));
  border: 1px solid rgba(74, 91, 255, 0.35);
  overflow: hidden;
  text-align: center;
}

.community-card::before {
  content: '';
  position: absolute;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.18), transparent 70%);
  top: -240px;
  right: -240px;
  pointer-events: none;
}

.community-card::after {
  content: '';
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 63, 242, 0.3), transparent 70%);
  bottom: -180px;
  left: -180px;
  pointer-events: none;
}

.community-card h3 {
  font-size: clamp(24px, 3vw, 32px);
  color: var(--text-strong);
  margin: 0 0 10px;
  position: relative;
}

.community-card p {
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 28px;
  position: relative;
}

.community-qq {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px 14px 26px;
  background: rgba(10, 22, 40, 0.55);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--accent);
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
}

.community-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.community-points {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 36px;
  text-align: left;
}

.community-points li {
  list-style: none;
  background: rgba(10, 22, 40, 0.4);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}

.community-points li strong {
  color: var(--text-strong);
  display: block;
  margin-bottom: 4px;
}

.community-points li span {
  color: var(--text-muted);
  font-size: 13.5px;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: 80px;
  padding: 60px 0 28px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(6, 15, 29, 0), rgba(6, 15, 29, 0.8));
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 36px;
  margin-bottom: 36px;
}

.footer-brand p {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 14px;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 14px;
  color: var(--text-strong);
  margin: 0 0 14px;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.footer-col li a {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
}

.footer-bottom a {
  color: var(--text-muted);
}

.footer-disclaimer {
  max-width: 880px;
  margin: 0 auto;
  line-height: 1.8;
  padding: 14px 18px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

/* ---------- 复制提示 toast ---------- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(10, 22, 40, 0.95);
  border: 1px solid rgba(0, 245, 255, 0.5);
  color: var(--text-strong);
  padding: 12px 22px;
  border-radius: 12px;
  font-size: 14px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  z-index: 99;
  backdrop-filter: blur(10px);
}

.toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- 滚动入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 80ms;
}
.reveal-delay-2 {
  transition-delay: 160ms;
}
.reveal-delay-3 {
  transition-delay: 240ms;
}
.reveal-delay-4 {
  transition-delay: 320ms;
}
.reveal-delay-5 {
  transition-delay: 400ms;
}

/* ---------- 子页面通用：页头 ---------- */
.page-header {
  position: relative;
  padding: clamp(80px, 10vw, 130px) 0 clamp(40px, 6vw, 80px);
  text-align: center;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(50% 50% at 30% 20%, rgba(74, 91, 255, 0.25), transparent 70%),
    radial-gradient(50% 50% at 70% 30%, rgba(123, 63, 242, 0.22), transparent 70%);
}

.page-header h1 {
  position: relative;
  font-size: clamp(34px, 5vw, 56px);
  margin: 0 0 14px;
  color: var(--text-strong);
  font-weight: 800;
}

.page-header p {
  position: relative;
  margin: 0 auto;
  max-width: 640px;
  color: var(--text-muted);
}

/* ---------- 子页面：功能详情 ---------- */
.feature-overview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-overview-card {
  padding: 26px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.feature-overview-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
}

.feature-overview-card .icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(74, 91, 255, 0.2), rgba(123, 63, 242, 0.2));
  color: var(--accent);
  margin-bottom: 14px;
}

.feature-overview-card h4 {
  font-size: 17px;
  margin: 0 0 6px;
  color: var(--text-strong);
}

.feature-overview-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
}

.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
  padding: clamp(40px, 6vw, 64px) 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}

.feature-detail:last-child {
  border-bottom: none;
}

.feature-detail.reverse .feature-detail-text {
  order: 2;
}

.feature-detail-eyebrow {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-detail-text h3 {
  font-size: clamp(24px, 3vw, 32px);
  margin: 0 0 14px;
  color: var(--text-strong);
}

.feature-detail-text p {
  color: var(--text-muted);
  margin: 0 0 20px;
}

.feature-detail-text .btn {
  margin-top: 10px;
}

/* ---------- 子页面：下载详情 ---------- */
.requirements {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 50px;
}

.requirements-card {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.requirements-card h4 {
  margin: 0 0 10px;
  color: var(--text-strong);
  font-size: 16px;
}

.requirements-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.9;
}

/* ---------- 子页面：加入我们 ---------- */
.join-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
}

.join-rules {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.join-rules h4 {
  margin: 0 0 14px;
  color: var(--text-strong);
}

.join-rules ol {
  margin: 0;
  padding-left: 20px;
  color: var(--text-muted);
  line-height: 1.95;
  font-size: 14.5px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1023px) {
  .bento {
    grid-template-columns: repeat(4, 1fr);
  }
  .bento-card.lg {
    grid-column: span 4;
  }
  .bento-card.md {
    grid-column: span 4;
  }
  .bento-card.sm {
    grid-column: span 2;
  }
  .feature-overview {
    grid-template-columns: repeat(2, 1fr);
  }
  .requirements {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  :root {
    --section-py: 64px;
  }

  body::before,
  body::after {
    display: none;
  }

  .hero-particles {
    display: none;
  }

  .nav-menu {
    position: fixed;
    inset: 68px 0 auto 0;
    background: rgba(10, 22, 40, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    padding: 8px 0 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .nav-menu.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-cta .btn:not(.nav-toggle):not(.nav-user-trigger) {
    display: none;
  }

  .nav-cta.is-authed .nav-auth-slot {
    display: flex;
  }

  .nav-cta.is-authed .nav-user-trigger {
    display: inline-flex !important;
  }

  .hero h1 {
    font-size: clamp(30px, 9vw, 40px);
  }

  .hero .subtitle {
    font-size: 14.5px;
  }

  .hero-stats {
    gap: 24px;
    padding: 22px 20px;
  }

  .bento {
    grid-template-columns: 1fr;
  }

  .bento-card.lg,
  .bento-card.md,
  .bento-card.sm {
    grid-column: span 1;
  }

  .scene,
  .feature-detail {
    grid-template-columns: 1fr;
  }

  .scene.reverse .scene-text,
  .feature-detail.reverse .feature-detail-text {
    order: 0;
  }

  .download-grid,
  .feature-overview,
  .requirements,
  .join-grid,
  .community-points {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .community-card {
    padding: 32px 22px;
  }
}

/* ---------- 安装步骤 ---------- */
.install-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
}

.install-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.install-step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
  color: var(--accent);
  background: rgba(0, 245, 255, 0.12);
  border: 1px solid rgba(0, 245, 255, 0.3);
}

.install-step h4 {
  margin: 0 0 6px;
  color: var(--text-strong);
  font-size: 16px;
}

.install-step p {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.install-step a {
  color: var(--accent);
}

/* ---------- 认证 / 登录页 ---------- */
.nav-auth-slot {
  display: flex;
  align-items: center;
  position: relative;
  z-index: 80;
}

.nav-cta.is-authed .nav-login-btn,
.nav-cta.is-authed .nav-download-btn {
  display: none !important;
}

.nav-user {
  position: relative;
  z-index: 80;
}

.nav-user-trigger.btn {
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 12px;
  max-width: 220px;
}

.nav-user-trigger.btn::after {
  display: none;
}

.nav-user-label {
  display: block;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

/* 下拉默认隐藏，仅悬停按钮区域时展示 */
.nav-user-dropdown {
  display: none !important;
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  left: auto;
  width: max-content;
  min-width: 200px;
  max-width: 280px;
  padding: 0;
  margin: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  z-index: 100;
  pointer-events: none;
}

.nav-user-dropdown::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: -14px;
  height: 14px;
}

.nav-user-dropdown-panel {
  padding: 12px;
  border-radius: 12px;
  background: rgba(10, 18, 34, 0.98);
  border: 1px solid rgba(123, 63, 242, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(74, 91, 255, 0.15);
}

.nav-user:hover .nav-user-dropdown {
  display: block !important;
  pointer-events: auto;
}

@media (hover: none) {
  .nav-user.is-open .nav-user-dropdown {
    display: block !important;
    pointer-events: auto;
  }
}

.nav-user-points {
  padding: 12px 14px;
  margin: 0 0 10px;
  border-radius: 10px;
  background: linear-gradient(
    135deg,
    rgba(74, 91, 255, 0.15) 0%,
    rgba(123, 63, 242, 0.1) 100%
  );
  border: 1px solid rgba(123, 63, 242, 0.25);
}

.nav-user-points-line,
.nav-user-invite-line {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text-strong);
  white-space: nowrap;
}

.nav-user-invite-line {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.nav-user-invite-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.06em;
  color: var(--text-strong);
}

.nav-user-points-num {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(120deg, var(--grad-from), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-user-feedback {
  display: block;
  width: 100%;
  margin: 0 0 8px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: #e0e7ff;
  text-decoration: none;
  text-align: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-sizing: border-box;
}

.nav-user-feedback:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.nav-user-redeem {
  display: block;
  width: 100%;
  margin: 0 0 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(120deg, var(--grad-from), var(--grad-to));
  border: none;
  cursor: pointer;
  transition: opacity 0.15s var(--ease), transform 0.15s var(--ease);
}

.nav-user-redeem:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.nav-user-logout {
  display: block;
  width: 100%;
  text-align: center;
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: #f87171;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.35);
  cursor: pointer;
  transition: background 0.15s var(--ease), color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.nav-user-logout:hover {
  background: rgba(248, 113, 113, 0.18);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.55);
}

.nav-login-btn.btn-primary {
  margin-right: 8px;
}

/* 兑换激活码弹窗（简约） */
.ainv-redeem-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.ainv-redeem-modal[hidden] {
  display: none !important;
}

.ainv-redeem-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}

.ainv-redeem-dialog {
  position: relative;
  width: 100%;
  max-width: 360px;
  padding: 20px;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.ainv-redeem-title {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 600;
  color: #111827;
}

.ainv-redeem-input {
  width: 100%;
  box-sizing: border-box;
  height: 44px;
  padding: 0 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 15px;
  color: #111827;
  outline: none;
}

.ainv-redeem-input:focus {
  border-color: #7b3ff2;
  box-shadow: 0 0 0 3px rgba(123, 63, 242, 0.15);
}

.ainv-redeem-error {
  margin: 10px 0 0;
  font-size: 13px;
  color: #dc2626;
}

.ainv-redeem-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.ainv-redeem-btn {
  flex: 1;
  height: 40px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}

.ainv-redeem-btn--ghost {
  background: #f3f4f6;
  color: #374151;
  border-color: #e5e7eb;
}

.ainv-redeem-btn--primary {
  background: linear-gradient(120deg, var(--grad-from), var(--grad-to));
  color: #fff;
}

/* 激活码兑换结果提示 */
.ainv-redeem-toast {
  position: fixed;
  top: 88px;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  max-width: min(90vw, 420px);
  padding: 14px 22px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 500;
  text-align: center;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity 2s ease, transform 2s ease;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

.ainv-redeem-toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.ainv-redeem-toast.is-fading {
  opacity: 0;
  transform: translateX(-50%) translateY(-12px);
}

.ainv-redeem-toast--success {
  color: #ecfdf5;
  background: rgba(6, 78, 59, 0.95);
  border: 1px solid rgba(52, 211, 153, 0.55);
}

.ainv-redeem-toast--error {
  color: #fef2f2;
  background: rgba(127, 29, 29, 0.95);
  border: 1px solid rgba(248, 113, 113, 0.55);
}

.page-login {
  --login-header-h: 56px;
  --login-chrome: calc(var(--login-header-h) + 16px);
  min-height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.page-login .site-header--login .nav {
  height: var(--login-header-h);
}

.page-login .auth-page--login {
  position: relative;
  flex: 1;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.page-login .auth-page--login > .auth-page-bg,
.page-login .auth-page--login > .hero-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.page-login .login-shell {
  position: relative;
  z-index: 1;
  flex: 1;
  width: 100%;
  min-height: calc(100dvh - var(--login-header-h));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  box-sizing: border-box;
}

.page-login .login-card {
  position: relative;
  width: min(90%, 420px);
  max-width: 420px;
  padding: 20px;
  border-radius: 24px;
  max-height: calc(100dvh - var(--login-chrome));
  overflow-y: auto;
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-1);
}

.auth-card-glow {
  position: absolute;
  top: -30%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(0, 245, 255, 0.1), transparent 65%);
  pointer-events: none;
}

.auth-card-head--simple {
  margin: 0 0 18px;
  text-align: center;
}

.auth-card-head--simple h1 {
  margin: 0 0 6px;
  font-size: 1.5rem;
  color: var(--text-strong);
}

.auth-card-head--simple p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.auth-field {
  margin-bottom: 12px;
}

.auth-field label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.auth-field input {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  box-sizing: border-box;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(6, 15, 29, 0.55);
  color: var(--text-strong);
  font-size: 16px;
}

.auth-field input:focus {
  border-color: rgba(0, 245, 255, 0.45);
  box-shadow: 0 0 0 3px var(--accent-soft);
  outline: none;
}

.auth-field input.is-invalid {
  border-color: rgba(248, 113, 113, 0.6);
}

.auth-hint {
  display: block;
  font-size: 11px;
  margin-top: 4px;
  color: #fca5a5;
}

.auth-field-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.auth-field-row input {
  flex: 1;
}

.auth-code-btn {
  flex-shrink: 0;
  align-self: stretch;
  white-space: nowrap;
}

.auth-captcha-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.auth-captcha-q {
  flex-shrink: 0;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(74, 91, 255, 0.15);
  border: 1px solid var(--border);
  font-weight: 600;
  color: var(--accent);
}

.auth-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 8px 0 0;
  font-size: 13px;
}

.auth-row--center {
  justify-content: center;
  gap: 16px;
}

.auth-link {
  color: var(--accent);
  font-weight: 500;
}

.auth-link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 13px;
  cursor: pointer;
  padding: 0;
}

.auth-form .btn-primary.btn-block {
  margin-top: 16px;
  height: 44px;
  line-height: 44px;
  font-size: 16px;
}

.auth-footer {
  margin: 16px 0 0;
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
}

.auth-alert {
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  margin-bottom: 12px;
  line-height: 1.4;
}

.auth-alert[hidden] {
  display: none !important;
}

.auth-alert.error {
  background: rgba(220, 38, 38, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: #fecaca;
}

.auth-alert.auth-alert--ok {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.35);
  color: #a7f3d0;
}

.account-points {
  text-align: center;
  padding: 24px 16px;
  margin-bottom: 20px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(74, 91, 255, 0.2), rgba(123, 63, 242, 0.12));
  border: 1px solid var(--border-strong);
}

.account-points-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.account-points-value {
  font-size: 42px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--grad-from), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.account-dl {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 10px 12px;
  font-size: 14px;
  margin-bottom: 20px;
}

.account-dl dt {
  color: var(--text-muted);
  margin: 0;
}

.account-dl dd {
  margin: 0;
  color: var(--text);
}

.auth-actions-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.auth-actions-row .btn {
  flex: 1;
  min-width: 120px;
  justify-content: center;
}

@media (max-width: 767px) {
  .nav-user-label {
    max-width: 120px;
  }

  .nav-user-dropdown {
    right: 0;
    min-width: 180px;
  }
}