/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter',sans-serif;background:#080810;color:#e2e2f0;line-height:1.6;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%}

/* ===== VARIABLES ===== */
:root{
  --purple:#6366f1;
  --purple-light:#8b5cf6;
  --purple-dark:#4f46e5;
  --bg:#080810;
  --bg2:#0d0d1a;
  --bg3:#12122a;
  --border:rgba(99,102,241,0.15);
  --text:#e2e2f0;
  --text-muted:#8888aa;
  --radius:16px;
}

/* ===== UTILITIES ===== */
.container{max-width:1140px;margin:0 auto;padding:0 24px}
.gradient-text{background:linear-gradient(135deg,#6366f1,#a855f7,#ec4899);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section-label{display:inline-block;font-size:12px;font-weight:600;letter-spacing:2px;text-transform:uppercase;color:var(--purple);background:rgba(99,102,241,0.1);border:1px solid var(--border);padding:4px 14px;border-radius:99px;margin-bottom:16px}
.section-title{font-size:clamp(28px,4vw,44px);font-weight:800;line-height:1.2;margin-bottom:16px}
.section-sub{font-size:18px;color:var(--text-muted);max-width:600px}

/* ===== NAVBAR ===== */
#navbar{position:fixed;top:0;left:0;right:0;z-index:100;padding:16px 24px;transition:all .3s}
#navbar.scrolled{background:rgba(8,8,16,.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:12px 24px}
.nav-inner{max-width:1140px;margin:0 auto;display:flex;align-items:center;gap:32px}
.logo{font-size:24px;font-weight:900;color:#fff;letter-spacing:-1px}
.logo-dot{color:var(--purple)}
.logo-brand{display:flex;align-items:center;text-decoration:none}
.logo-img{height:44px;width:auto;object-fit:contain}
.footer-logo-brand{opacity:0.85}
.footer-logo-brand .logo-img{height:36px}
.nav-links{display:flex;gap:28px;margin-right:auto}
.nav-links a{font-size:15px;color:var(--text-muted);transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-actions{display:flex;gap:12px;align-items:center}
.btn-ghost{font-size:15px;color:var(--text-muted);padding:8px 16px;border-radius:8px;transition:all .2s}
.btn-ghost:hover{color:#fff;background:rgba(255,255,255,.05)}
.btn-primary{font-size:14px;font-weight:600;color:#fff;background:var(--purple);padding:8px 18px;border-radius:8px;transition:all .2s}
.btn-primary:hover{background:var(--purple-dark);transform:translateY(-1px)}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:22px;cursor:pointer}
.nav-mobile{display:none;flex-direction:column;padding:12px 24px 16px;gap:8px;background:rgba(8,8,16,.95);border-bottom:1px solid var(--border)}
.nav-mobile a{font-size:16px;color:var(--text-muted);padding:8px 0}
.nav-mobile.open{display:flex}

/* ===== HERO ===== */
#hero{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:120px 24px 80px;text-align:center;position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse 80% 60% at 50% -10%,rgba(99,102,241,.25),transparent)}
.hero-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.4;animation:float 8s ease-in-out infinite}
.orb1{width:500px;height:500px;background:radial-gradient(circle,#6366f1,transparent);top:-150px;left:-100px;animation-delay:0s}
.orb2{width:400px;height:400px;background:radial-gradient(circle,#8b5cf6,transparent);bottom:-100px;right:-100px;animation-delay:-4s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-30px)}}
.badge-row{display:flex;align-items:center;gap:10px;justify-content:center;margin-bottom:24px;flex-wrap:wrap}
.badge{background:linear-gradient(135deg,rgba(99,102,241,.2),rgba(139,92,246,.2));border:1px solid var(--border);padding:5px 14px;border-radius:99px;font-size:13px;font-weight:600}
.badge-text{font-size:13px;color:var(--text-muted)}
.hero-title{font-size:clamp(38px,6vw,76px);font-weight:900;line-height:1.1;letter-spacing:-2px;margin-bottom:24px;position:relative;z-index:1}
.hero-sub{font-size:clamp(16px,2vw,20px);color:var(--text-muted);max-width:620px;margin:0 auto 36px;position:relative;z-index:1}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:32px;position:relative;z-index:1}
.btn-hero-primary{display:inline-block;background:linear-gradient(135deg,var(--purple),var(--purple-light));color:#fff;font-size:16px;font-weight:700;padding:14px 32px;border-radius:12px;transition:all .3s;box-shadow:0 0 40px rgba(99,102,241,.4)}
.btn-hero-primary:hover{transform:translateY(-3px);box-shadow:0 8px 50px rgba(99,102,241,.6)}
.btn-hero-ghost{display:inline-block;color:var(--text-muted);font-size:16px;font-weight:600;padding:14px 32px;border-radius:12px;border:1px solid var(--border);transition:all .3s}
.btn-hero-ghost:hover{color:#fff;border-color:rgba(99,102,241,.5);background:rgba(99,102,241,.05)}
.hero-trust{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;color:var(--text-muted);font-size:13px;position:relative;z-index:1}
.hero-trust span{display:flex;align-items:center;gap:4px}

/* HERO MOCKUP */
.hero-mockup{position:relative;z-index:1;margin-top:60px;width:100%;max-width:680px;margin-left:auto;margin-right:auto}
.mockup-window{background:#0e0e1e;border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:0 40px 100px rgba(0,0,0,.6),0 0 80px rgba(99,102,241,.1)}
.mockup-bar{background:#1a1a2e;padding:12px 16px;display:flex;gap:8px}
.mockup-bar span{width:12px;height:12px;border-radius:50%;background:#3a3a5a}
.mockup-content{padding:32px;text-align:left;position:relative;min-height:140px}
.mockup-text p{font-size:16px;line-height:1.8;color:#b0b0cc}
.word-highlight{color:var(--purple);border-bottom:2px solid var(--purple);cursor:pointer;font-weight:600;transition:all .2s}
.word-highlight:hover{background:rgba(99,102,241,.1);border-radius:4px}
.word-popup{display:none;position:absolute;top:100px;left:60px;background:#1a1a2e;border:1px solid var(--border);border-radius:12px;padding:16px;min-width:260px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.word-popup.show{display:block;animation:popIn .2s ease}
@keyframes popIn{from{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}
.popup-word{font-size:20px;font-weight:700;color:#fff;margin-bottom:4px}
.popup-phonetic{font-size:14px;color:var(--text-muted);font-weight:400}
.popup-meaning{font-size:15px;color:#a0a0cc;margin-bottom:12px}
.popup-actions{display:flex;gap:8px}
.popup-btn{padding:6px 14px;border-radius:8px;border:1px solid var(--border);background:rgba(99,102,241,.1);color:var(--text-muted);cursor:pointer;font-size:13px;transition:all .2s}
.popup-btn:hover,.popup-btn.save:hover{background:var(--purple);color:#fff;border-color:var(--purple)}
.popup-btn.save{background:rgba(99,102,241,.2);color:var(--purple)}

/* ===== STATS ===== */
#stats{padding:60px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:rgba(99,102,241,.03)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-size:clamp(28px,4vw,44px);font-weight:900;background:linear-gradient(135deg,#fff,var(--purple-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-label{font-size:14px;color:var(--text-muted);margin-top:4px}

/* ===== PAIN ===== */
#pain{padding:100px 0;background:var(--bg2)}
.pain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:48px 0 40px}
.pain-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:32px;transition:all .4s;opacity:0;transform:translateY(30px)}
.pain-card.visible{opacity:1;transform:none}
.pain-card:hover{border-color:rgba(99,102,241,.4);transform:translateY(-4px)}
.pain-icon{font-size:36px;margin-bottom:16px}
.pain-card h3{font-size:18px;font-weight:700;margin-bottom:12px;color:#fff}
.pain-card p{color:var(--text-muted);font-size:15px;line-height:1.7}
.pain-bridge{text-align:center;font-size:18px;color:var(--text-muted);padding:24px 32px;background:rgba(99,102,241,.06);border:1px solid var(--border);border-radius:12px}
.pain-bridge strong{color:#fff}

/* ===== FEATURES ===== */
#features{padding:100px 0}
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center;margin:80px 0;opacity:0;transform:translateY(40px);transition:all .6s}
.feature-row.visible{opacity:1;transform:none}
.feature-row.reverse .feature-text{order:2}
.feature-row.reverse .feature-visual{order:1}
.feature-num{font-size:13px;font-weight:700;letter-spacing:2px;color:var(--purple);margin-bottom:12px;opacity:.7}
.feature-text h3{font-size:clamp(22px,3vw,32px);font-weight:800;margin-bottom:16px;color:#fff}
.feature-text p{color:var(--text-muted);font-size:16px;line-height:1.8;margin-bottom:20px}
.feature-tags{display:flex;flex-wrap:wrap;gap:8px}
.feature-tags span{font-size:12px;font-weight:600;color:var(--purple);background:rgba(99,102,241,.1);border:1px solid rgba(99,102,241,.2);padding:4px 12px;border-radius:99px}
.feature-visual{display:flex;align-items:center;justify-content:center}
.fv-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:32px;width:100%;min-height:200px}

/* Feature Visuals */
.fv-line{height:12px;background:rgba(255,255,255,.08);border-radius:6px;margin-bottom:12px}
.fv-line.short{width:60%}
.fv-line.highlight-word{background:rgba(99,102,241,.3);width:30%;display:inline-block;position:relative}
.fv-popup{margin-top:16px;background:var(--bg3);border:1px solid var(--border);border-radius:10px;padding:12px 16px;display:flex;justify-content:space-between;align-items:center;font-size:14px;color:var(--text-muted)}
.vocab-item{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border);transition:all .2s}
.vocab-item:last-child{border-bottom:none}
.vocab-item.active{background:rgba(99,102,241,.08);border-radius:8px;padding:12px}
.vocab-word{font-weight:600;color:#fff}
.vocab-cn{font-size:13px;color:var(--text-muted)}
.fsrs-chart{display:flex;align-items:flex-end;gap:8px;height:120px;margin-bottom:12px}
.fsrs-bar{flex:1;background:linear-gradient(to top,var(--purple),var(--purple-light));border-radius:6px 6px 0 0;display:flex;align-items:flex-end;justify-content:center;padding-bottom:6px;transition:height .5s}
.fsrs-bar span{font-size:11px;color:rgba(255,255,255,.7);writing-mode:horizontal-tb}
.fsrs-label{font-size:12px;color:var(--text-muted);text-align:center}
.sync-card{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:40px}
.device{font-size:48px}
.sync-arrows{font-size:28px;color:var(--purple);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.sync-status{font-size:13px;color:#4ade80;background:rgba(74,222,128,.1);padding:6px 16px;border-radius:99px;border:1px solid rgba(74,222,128,.2)}

/* ===== HOW IT WORKS ===== */
#how{padding:100px 0;background:var(--bg2)}
.steps-grid{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:16px;align-items:center;margin:60px 0 40px}
.step-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:32px;text-align:center;transition:all .4s;opacity:0;transform:translateY(30px)}
.step-card.visible{opacity:1;transform:none}
.step-card:hover{border-color:rgba(99,102,241,.4);transform:translateY(-4px)}
.step-num{font-size:13px;font-weight:700;letter-spacing:2px;color:var(--purple);margin-bottom:16px}
.step-card h3{font-size:28px;font-weight:900;color:#fff;margin-bottom:12px}
.step-card p{color:var(--text-muted);font-size:14px;line-height:1.7}
.step-arrow{font-size:32px;color:rgba(99,102,241,.4);flex-shrink:0}
.how-bridge{text-align:center;font-size:18px;color:var(--text-muted)}
.how-bridge strong{color:#fff}

/* ===== AUDIENCE ===== */
#audience{padding:100px 0}
.audience-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.audience-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:36px 32px;transition:all .4s;opacity:0;transform:translateY(30px)}
.audience-card.visible{opacity:1;transform:none}
.audience-card:hover{border-color:rgba(99,102,241,.5);background:var(--bg3);transform:translateY(-4px)}
.audience-icon{font-size:40px;margin-bottom:20px}
.audience-card h3{font-size:20px;font-weight:700;color:#fff;margin-bottom:12px}
.audience-card p{color:var(--text-muted);font-size:15px;line-height:1.7}

/* ===== PRICING ===== */
#pricing{padding:100px 0;background:var(--bg2)}
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:60px auto 24px;max-width:1000px;align-items:stretch}
.price-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;position:relative;transition:all .4s;opacity:0;transform:translateY(30px);display:flex;flex-direction:column}
.price-card.visible{opacity:1;transform:none}
.price-card.trial{border-color:rgba(99,102,241,.5);background:linear-gradient(180deg,rgba(99,102,241,.08),var(--bg3))}
.price-card.recommended{border-color:var(--purple);box-shadow:0 0 40px rgba(99,102,241,.15)}
.price-tag-top{font-size:12px;font-weight:700;color:var(--purple);background:rgba(99,102,241,.1);border:1px solid rgba(99,102,241,.2);padding:4px 12px;border-radius:99px;display:inline-block;margin-bottom:16px;align-self:flex-start}
.price-tag-placeholder{height:28px;margin-bottom:16px}
.price-card h3{font-size:16px;font-weight:700;color:var(--text-muted);margin-bottom:16px;text-transform:uppercase;letter-spacing:1px}
.price-amount{display:flex;align-items:baseline;gap:6px;margin-bottom:6px}
.price-num{font-size:40px;font-weight:900;color:#fff}
.price-period{font-size:14px;color:var(--text-muted)}
.price-original{font-size:13px;color:var(--text-muted);margin-bottom:24px;min-height:18px}
.price-features{list-style:none;margin-bottom:28px;display:flex;flex-direction:column;gap:10px;flex:1}
.price-features li{font-size:14px;color:var(--text-muted)}
.btn-price-primary{display:block;text-align:center;background:linear-gradient(135deg,var(--purple),var(--purple-light));color:#fff;font-size:14px;font-weight:700;padding:12px;border-radius:10px;transition:all .3s;margin-bottom:10px}
.btn-price-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(99,102,241,.4)}
.btn-price-ghost{display:block;text-align:center;color:var(--text-muted);font-size:14px;font-weight:600;padding:12px;border-radius:10px;border:1px solid var(--border);transition:all .3s;margin-bottom:10px}
.btn-price-ghost:hover{border-color:var(--purple);color:var(--purple)}
.price-note{font-size:12px;color:var(--text-muted);text-align:center}
.pricing-footer{text-align:center;font-size:14px;color:var(--text-muted)}
.pricing-footer a{color:var(--purple);text-decoration:underline}

/* ===== FAQ ===== */
#faq{padding:100px 0}
.faq-list{margin-top:48px;display:flex;flex-direction:column;gap:12px;max-width:760px;margin-left:auto;margin-right:auto}
.faq-item{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;cursor:pointer;transition:all .3s;opacity:0;transform:translateY(20px)}
.faq-item.visible{opacity:1;transform:none}
.faq-item:hover,.faq-item.open{border-color:rgba(99,102,241,.4)}
.faq-q{font-size:16px;font-weight:600;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-arrow{font-size:20px;color:var(--purple);transition:transform .3s;flex-shrink:0}
.faq-item.open .faq-arrow{transform:rotate(45deg)}
.faq-a{font-size:15px;color:var(--text-muted);line-height:1.7;max-height:0;overflow:hidden;transition:all .4s;margin-top:0}
.faq-item.open .faq-a{max-height:200px;margin-top:12px}

/* ===== FINAL CTA ===== */
#cta{padding:120px 0;text-align:center;position:relative;overflow:hidden}
.cta-bg{position:absolute;inset:0;background:radial-gradient(ellipse 70% 80% at 50% 50%,rgba(99,102,241,.15),transparent)}
#cta .container{position:relative;z-index:1}
#cta h2{font-size:clamp(32px,5vw,56px);font-weight:900;line-height:1.2;margin-bottom:20px}
#cta p{font-size:18px;color:var(--text-muted);margin-bottom:36px;line-height:1.8}
.cta-trust{margin-top:20px;font-size:13px;color:var(--text-muted)}

/* ===== FOOTER ===== */
footer{padding:60px 0 32px;border-top:1px solid var(--border);background:var(--bg)}
.footer-inner{display:flex;justify-content:space-between;align-items:flex-start;gap:40px;margin-bottom:40px;flex-wrap:wrap}
.footer-brand .logo{font-size:22px;font-weight:900;margin-bottom:8px}
.footer-logo{height:40px;width:auto;object-fit:contain;margin-bottom:10px}
.footer-brand p{font-size:14px;color:var(--text-muted)}
.footer-links{display:flex;gap:24px;flex-wrap:wrap}
.footer-links a{font-size:14px;color:var(--text-muted);transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--border);padding-top:24px;font-size:13px;color:var(--text-muted);flex-wrap:wrap;gap:12px}
.footer-bottom div{display:flex;gap:20px}
.footer-bottom a{color:var(--text-muted);transition:color .2s}
.footer-bottom a:hover{color:#fff}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .pricing-grid{grid-template-columns:repeat(2,1fr)}
  .feature-row{grid-template-columns:1fr;gap:40px}
  .feature-row.reverse .feature-text{order:1}
  .feature-row.reverse .feature-visual{order:2}
  .steps-grid{grid-template-columns:1fr;gap:12px}
  .step-arrow{transform:rotate(90deg);margin:auto}
}
@media(max-width:768px){
  .nav-links,.nav-actions{display:none}
  .nav-toggle{display:block}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .pain-grid,.audience-grid{grid-template-columns:1fr}
  .pricing-grid{grid-template-columns:1fr}
  .hero-trust{gap:12px;font-size:12px}
  .footer-inner{flex-direction:column}
}

/* ===== POLICY & DOCUMENT PAGES ===== */
.policy-page {
  padding-top: 120px;
  background: var(--bg);
  min-height: 100vh;
}
.policy-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 24px 100px;
}
.policy-header {
  text-align: center;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 32px;
}
.policy-title {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  margin-bottom: 12px;
}
.policy-meta {
  font-size: 14px;
  color: var(--text-muted);
}
.policy-body {
  font-size: 16px;
  line-height: 1.8;
  color: #b0b0cc;
}
.policy-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin-top: 40px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}
.policy-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  margin-top: 24px;
  margin-bottom: 12px;
}
.policy-body p {
  margin-bottom: 20px;
}
.policy-body ul, .policy-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}
.policy-body li {
  margin-bottom: 8px;
}
.policy-body strong {
  color: #fff;
}
.policy-body a {
  color: var(--purple-light);
  text-decoration: underline;
  transition: color 0.2s;
}
.policy-body a:hover {
  color: #fff;
}
.policy-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}
.policy-table th, .policy-table td {
  padding: 14px 18px;
  text-align: left;
  border: 1px solid var(--border);
}
.policy-table th {
  background: rgba(99,102,241,0.1);
  color: #fff;
  font-weight: 600;
}
.policy-table tr:nth-child(even) {
  background: rgba(255,255,255,0.02);
}
.policy-card-info {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}