/* ============================================================
   落地页（index.html）
   ============================================================ */

.landing { position: relative; overflow-x: hidden; }

/* ---- 移动端防横向晃动 & 居中保险（任务1） ---- */
/* iOS Safari 需 html 也裁剪；clip 不产生滚动上下文，优先于 hidden 生效 */
html, body { overflow-x: hidden; overflow-x: clip; max-width: 100%; }
body.landing { width: 100%; margin: 0 auto; }
.landing img, .landing canvas, .landing svg, .landing video { max-width: 100%; }
.section, .hero-inner, .feature-card, .plugin-card, .plan-card, .game-banner { min-width: 0; }

/* ---- 顶栏 ---- */
.ld-nav {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%);
  z-index: var(--z-nav);
  width: min(1120px, calc(100% - 32px));
  display: flex; align-items: center; gap: var(--sp-5);
  padding: 10px 20px; border-radius: var(--r-full);
  background: var(--bg-glass);
}
.ld-logo { display: flex; align-items: center; gap: var(--sp-2); font-weight: 800; font-size: var(--fs-lg); letter-spacing: 1px; }
.ld-logo .logo-orb {
  width: 32px; height: 32px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: var(--grad-brand); color: var(--tx-on-neon);
  box-shadow: var(--glow-brand);
}
.ld-nav-links { display: flex; gap: var(--sp-5); margin-left: var(--sp-4); }
.ld-nav-links a { color: var(--tx-2); font-size: var(--fs-sm); transition: color var(--t-fast); }
.ld-nav-links a:hover { color: var(--neon-cyan); }
.ld-nav-actions { margin-left: auto; display: flex; gap: var(--sp-3); align-items: center; }

/* ---- Hero ---- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 120px 24px 80px;
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 62% 48% at 50% 36%, rgba(79, 124, 255, 0.14), transparent 70%);
}
.hero-inner { position: relative; z-index: 2; max-width: 860px; animation: fadeUp 0.9s var(--ease) both; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: var(--r-full);
  font-size: var(--fs-sm); color: var(--neon-cyan);
  background: rgba(0, 229, 255, 0.08); border: 1px solid var(--line-glow);
  box-shadow: var(--glow-cyan); margin-bottom: var(--sp-5);
}
.hero h1 {
  font-size: clamp(34px, 6vw, var(--fs-hero));
  line-height: 1.18; font-weight: 800; letter-spacing: 1px;
  margin-bottom: var(--sp-5);
}
.hero-sub { font-size: var(--fs-lg); color: var(--tx-2); max-width: 620px; margin: 0 auto var(--sp-6); line-height: 1.9; }
.hero-cta { display: flex; gap: var(--sp-4); justify-content: center; flex-wrap: wrap; }
.hero-cta .btn { padding: 13px 34px; font-size: var(--fs-lg); border-radius: var(--r-full); }

/* 漂浮玻璃卡 */
.float-card {
  position: absolute; z-index: 1;
  padding: 14px 18px; border-radius: var(--r-lg);
  background: var(--bg-glass); border: 1px solid var(--line-2);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-2);
  animation: floatY 6s ease-in-out infinite;
  pointer-events: none;
}
.float-card .fc-head { display: flex; align-items: center; gap: 8px; font-size: var(--fs-xs); color: var(--tx-3); margin-bottom: 8px; }
.float-card .fc-head .i { width: 14px; height: 14px; color: var(--neon-cyan); }
.fc-1 { top: 24%; left: 7%; width: 218px; animation-delay: 0.4s; }
.fc-2 { top: 56%; right: 6%; width: 200px; animation-delay: 1.2s; }
.fc-3 { bottom: 13%; left: 12%; width: 190px; animation-delay: 2s; }
.fc-line { height: 8px; border-radius: 4px; background: var(--bg-3); margin: 7px 0; }
.fc-line.w60 { width: 60%; } .fc-line.w80 { width: 80%; }
.fc-line.neon { background: var(--grad-brand); opacity: 0.6; }
.fc-chips { display: flex; gap: 6px; }
.fc-chips span { width: 30px; height: 30px; border-radius: 9px; background: var(--grad-brand-soft); border: 1px solid var(--line-1); display: flex; align-items: center; justify-content: center; color: var(--neon-violet); }
.fc-chips .i { width: 15px; height: 15px; }

/* ---- 区块通用 ---- */
.section { position: relative; padding: 110px 24px; max-width: 1120px; margin: 0 auto; }
.section-kicker { text-align: center; color: var(--neon-cyan); font-size: var(--fs-sm); letter-spacing: 3px; font-weight: 600; margin-bottom: 12px; }
.section-title { text-align: center; font-size: var(--fs-3xl); font-weight: 800; margin-bottom: 14px; }
.section-desc { text-align: center; color: var(--tx-2); max-width: 560px; margin: 0 auto 56px; line-height: 1.9; }

/* ---- 功能区 ---- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-5); }
.feature-card {
  padding: 30px 24px; border-radius: var(--r-xl);
  background: var(--bg-glass); border: 1px solid var(--line-1);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid), box-shadow var(--t-mid);
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--line-glow); box-shadow: var(--glow-cyan); }
.feature-ic {
  width: 52px; height: 52px; border-radius: 15px; margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center;
  background: var(--grad-brand); color: var(--tx-on-neon);
  box-shadow: var(--glow-brand);
}
.feature-ic .i { width: 24px; height: 24px; }
.feature-card h3 { font-size: var(--fs-lg); margin-bottom: 10px; }
.feature-card p { color: var(--tx-2); font-size: var(--fs-sm); line-height: 1.8; }

/* ---- 插件区 ---- */
.plugin-section { position: relative; }
.plugin-section::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 60% 50% at 50% 40%, rgba(139, 92, 246, 0.1), transparent 70%);
}
.plugin-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-5); position: relative; }
.plugin-card {
  position: relative; padding: 24px; border-radius: var(--r-lg);
  background: var(--bg-glass); border: 1px solid var(--line-1);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid);
}
.plugin-card:hover { transform: translateY(-4px); border-color: var(--line-2); }
.plugin-card .pc-ic {
  width: 44px; height: 44px; border-radius: 12px; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center;
  background: var(--grad-brand-soft); border: 1px solid var(--line-1); color: var(--neon-cyan);
}
.plugin-card .pc-ic img { width: 24px; height: 24px; object-fit: contain; }
.plugin-card .pc-ic span { display: inline-flex; }
.plugin-card h4 { font-size: var(--fs-md); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.plugin-card p { color: var(--tx-3); font-size: var(--fs-sm); line-height: 1.7; }
.pc-crown { position: absolute; top: 16px; right: 16px; color: var(--neon-gold); filter: drop-shadow(0 0 6px rgba(255, 200, 87, 0.6)); }
.pc-crown .i { width: 18px; height: 18px; }

/* ---- 会员区 ---- */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--sp-5); align-items: stretch; }
.plan-card {
  position: relative; padding: 32px 26px; border-radius: var(--r-xl);
  background: var(--bg-glass); border: 1px solid var(--line-1);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  display: flex; flex-direction: column;
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid);
}
.plan-card:hover { transform: translateY(-6px); }
.plan-card.recommended {
  border-color: var(--line-glow);
  box-shadow: var(--glow-cyan), var(--shadow-2);
  animation: pulseGlow 3.2s ease-in-out infinite;
}
.plan-rec-tag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  padding: 4px 16px; border-radius: var(--r-full);
  background: var(--grad-brand); color: var(--tx-on-neon);
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: 1px;
  box-shadow: var(--glow-brand); white-space: nowrap;
}
.plan-name { font-size: var(--fs-lg); font-weight: 700; margin-bottom: 6px; }
.plan-price { margin: 12px 0 20px; }
.plan-price .num { font-size: 40px; font-weight: 800; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.plan-price .unit { color: var(--tx-3); font-size: var(--fs-sm); }
.plan-perks { flex: 1; display: flex; flex-direction: column; gap: 10px; margin-bottom: 26px; }
.plan-perks li { display: flex; gap: 9px; align-items: flex-start; color: var(--tx-2); font-size: var(--fs-sm); line-height: 1.6; }
.plan-perks .i { width: 15px; height: 15px; color: var(--neon-green); margin-top: 3px; }

/* ---- 页脚 ---- */
.ld-footer {
  border-top: 1px solid var(--line-1); padding: 44px 24px 36px;
  text-align: center; color: var(--tx-3); font-size: var(--fs-sm);
}
.ld-footer .f-links { display: flex; gap: 26px; justify-content: center; margin-bottom: 16px; flex-wrap: wrap; }
.ld-footer a { transition: color var(--t-fast); }
.ld-footer a:hover { color: var(--neon-cyan); }

/* ---- 响应式 ---- */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .plugin-grid { grid-template-columns: repeat(2, 1fr); }
  .ld-nav-links { display: none; }
  .float-card { display: none; }
}
@media (max-width: 560px) {
  .feature-grid { grid-template-columns: 1fr; }
  .plugin-grid { grid-template-columns: 1fr; }
  .section { padding: 72px 18px; }
  .hero-cta .btn { padding: 12px 26px; font-size: var(--fs-md); }
  /* 任务1：小屏居中与紧凑化 */
  .ld-nav { top: 10px; width: calc(100% - 20px); padding: 8px 14px; gap: var(--sp-3); }
  .hero { padding: 96px 18px 64px; }
  .hero-badge { font-size: var(--fs-xs); padding: 5px 12px; gap: 6px; }
  .hero-sub { font-size: var(--fs-md); }
  .hero-cta { flex-direction: column; align-items: stretch; width: 100%; max-width: 320px; margin: 0 auto; }
  .hero-cta .btn { width: 100%; text-align: center; }
  .section-title { word-break: break-word; }
  .plan-card { padding: 26px 18px; }
}

/* 游戏世界入口 */
.game-banner {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding: var(--sp-6);
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.10), rgba(139, 92, 246, 0.14)), var(--bg-glass);
  border: 1px solid var(--line-2);
  transition: border-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.game-banner:hover { border-color: var(--line-glow); box-shadow: var(--shadow-2), var(--glow-cyan); }
.gb-orb {
  width: 72px; height: 72px; flex: none;
  display: grid; place-items: center;
  border-radius: 20px;
  background: var(--grad-brand);
  color: var(--tx-on-neon);
  box-shadow: var(--glow-brand);
}
.gb-orb .i { width: 34px; height: 34px; }
.gb-main { flex: 1; }
.gb-main h3 { font-size: var(--fs-xl); margin-bottom: 6px; }
.gb-main p { color: var(--tx-2); font-size: var(--fs-sm); line-height: 1.8; margin-bottom: 12px; }
.gb-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.gb-tags span {
  font-size: var(--fs-xs);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 229, 255, 0.35);
  background: rgba(0, 229, 255, 0.08);
  padding: 3px 12px;
  border-radius: var(--r-full);
}
.gb-cta { flex: none; }
.life-banner {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding: var(--sp-6);
  border: 1px solid var(--line-2);
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.16), rgba(236, 72, 153, 0.12)), var(--bg-glass);
  transition: border-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.life-banner:hover { border-color: var(--line-glow); box-shadow: var(--shadow-2), var(--glow-brand); }
.life-orb {
  width: 72px;
  height: 72px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 20px;
  color: var(--tx-on-neon);
  background: linear-gradient(135deg, #8b5cf6, #ec4899);
  box-shadow: var(--glow-brand);
  font: 800 38px Georgia, serif;
}
.life-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.life-tags span {
  padding: 3px 12px;
  border: 1px solid rgba(196, 181, 253, 0.36);
  border-radius: var(--r-full);
  color: #c4b5fd;
  background: rgba(139, 92, 246, 0.09);
  font-size: var(--fs-xs);
}
/* 学习与知识库入口 */
.learn-duo {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-5);
}
.learn-card {
  position: relative;
  padding: var(--sp-6);
  border-radius: var(--r-xl);
  border: 1px solid var(--line-2);
  background: linear-gradient(150deg, rgba(52, 211, 153, 0.12), rgba(56, 189, 248, 0.10) 55%, rgba(139, 92, 246, 0.10)), var(--bg-glass);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.learn-card:last-child {
  background: linear-gradient(150deg, rgba(251, 191, 36, 0.12), rgba(56, 189, 248, 0.10) 55%, rgba(139, 92, 246, 0.10)), var(--bg-glass);
}
.learn-card:hover { transform: translateY(-4px); border-color: var(--line-glow); box-shadow: var(--shadow-2), var(--glow-cyan); }
.lc-orb {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  border-radius: 18px;
  color: var(--tx-on-neon);
  margin-bottom: var(--sp-4);
}
.lc-orb .i { width: 30px; height: 30px; }
.lc-orb-a { background: linear-gradient(135deg, #34d399, #38bdf8); box-shadow: 0 8px 28px rgba(56, 189, 248, 0.35); }
.lc-orb-b { background: linear-gradient(135deg, #fbbf24, #f472b6); box-shadow: 0 8px 28px rgba(244, 114, 182, 0.32); }
.learn-card h3 { font-size: var(--fs-xl); margin-bottom: 8px; }
.learn-card p { color: var(--tx-2); font-size: var(--fs-sm); line-height: 1.9; margin-bottom: 14px; }
.lc-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.lc-tags span {
  font-size: var(--fs-xs);
  color: #6ee7b7;
  border: 1px solid rgba(52, 211, 153, 0.38);
  background: rgba(52, 211, 153, 0.08);
  padding: 3px 12px;
  border-radius: var(--r-full);
}
.learn-card:last-child .lc-tags span {
  color: #fcd34d;
  border-color: rgba(251, 191, 36, 0.38);
  background: rgba(251, 191, 36, 0.08);
}
.learn-cta { display: flex; justify-content: center; margin-top: var(--sp-6); }
@media (max-width: 720px) {
  .learn-duo { grid-template-columns: 1fr; }
  .learn-card { text-align: center; }
  .lc-orb { margin: 0 auto var(--sp-4); }
  .lc-tags { justify-content: center; }
}
@media (max-width: 720px) {
  .game-banner, .life-banner { flex-direction: column; text-align: center; }
  .gb-tags, .life-tags { justify-content: center; }
}