/* ========== RESET & VARS ========== */
*{margin:0;padding:0;box-sizing:border-box}

:root{
  --yt-red:#FF0000;
  --yt-red-dark:#CC0000;
  --yt-red-glow:rgba(255,0,0,0.3);
  --radius:16px;
  --radius-sm:12px;
  --transition:0.3s cubic-bezier(.4,0,.2,1);
}

/* Dark theme (default) */
:root,body{
  --bg:#0a0a12;
  --bg-card:rgba(255,255,255,0.04);
  --bg-card-solid:#14141e;
  --bg-card-hover:rgba(255,255,255,0.07);
  --bg-section-alt:#0d0d18;
  --bg-navbar:rgba(10,10,18,0.8);
  --bg-navbar-solid:rgba(10,10,18,0.95);
  --text:#f0f0f5;
  --text-secondary:#9a9ab0;
  --text-dim:#5a5a72;
  --border:rgba(255,255,255,0.08);
  --border-card:rgba(255,255,255,0.06);
  --accent:#7c5cfc;
  --accent-light:#9b7dff;
  --accent-glow:rgba(124,92,252,0.25);
  --card-shadow:0 8px 32px rgba(0,0,0,0.3);
  --hero-bg:linear-gradient(135deg,#0a0a12 0%,#1a1030 40%,#251545 70%,#0a0a12 100%);
  --tag-bg:rgba(124,92,252,0.1);
  --tag-border:rgba(124,92,252,0.25);
  --tag-color:#b8a0ff;
  --search-bg:rgba(255,255,255,0.06);
  --search-border:rgba(255,255,255,0.1);
  --input-bg:rgba(255,255,255,0.05);
  --filter-bg:rgba(255,255,255,0.05);
  --filter-hover:rgba(255,255,255,0.08);
  --toggle-bg:rgba(255,255,255,0.08);
  --toggle-hover:rgba(255,255,255,0.14);
  --money-range:#9b7dff;
  --footer-border:rgba(255,255,255,0.06);
}

/* Light theme */
body.light-theme{
  --bg:#f2f2f7;
  --bg-card:rgba(0,0,0,0.02);
  --bg-card-solid:#ffffff;
  --bg-card-hover:rgba(0,0,0,0.04);
  --bg-section-alt:#e8e8ee;
  --bg-navbar:rgba(242,242,247,0.85);
  --bg-navbar-solid:rgba(242,242,247,0.97);
  --text:#1a1a2e;
  --text-secondary:#5a5a72;
  --text-dim:#9a9ab0;
  --border:rgba(0,0,0,0.08);
  --border-card:rgba(0,0,0,0.06);
  --accent:#6a4ee0;
  --accent-light:#7c5cfc;
  --accent-glow:rgba(106,78,224,0.15);
  --card-shadow:0 8px 32px rgba(0,0,0,0.06);
  --hero-bg:linear-gradient(135deg,#f2f2f7 0%,#e0d4f7 40%,#d4c4f0 70%,#f2f2f7 100%);
  --tag-bg:rgba(106,78,224,0.08);
  --tag-border:rgba(106,78,224,0.2);
  --tag-color:#6a4ee0;
  --search-bg:rgba(0,0,0,0.04);
  --search-border:rgba(0,0,0,0.1);
  --input-bg:rgba(0,0,0,0.03);
  --filter-bg:rgba(0,0,0,0.04);
  --filter-hover:rgba(0,0,0,0.07);
  --toggle-bg:rgba(0,0,0,0.06);
  --toggle-hover:rgba(0,0,0,0.1);
  --money-range:#6a4ee0;
  --footer-border:rgba(0,0,0,0.08);
}

/* ========== BASE ========== */
html{scroll-behavior:smooth;scroll-padding-top:80px}

body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  transition:background .4s,color .4s;
}

.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ========== NAVBAR ========== */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:var(--bg-navbar);
  backdrop-filter:blur(24px);
  -webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--border);
  transition:var(--transition);
}
.navbar.scrolled{background:var(--bg-navbar-solid)}

.nav-inner{
  max-width:1200px;margin:0 auto;padding:0 24px;
  height:64px;display:flex;align-items:center;justify-content:space-between;
}

.nav-logo{
  display:flex;align-items:center;gap:10px;
  text-decoration:none;color:var(--text);
  font-size:0.85rem;font-weight:800;letter-spacing:0.08em;
}
.logo-icon{
  width:32px;height:22px;border-radius:6px;
  display:flex;align-items:center;justify-content:center;
  background:#FF0000;flex-shrink:0;
}
.logo-icon svg{display:block}
.logo-icon.small{width:24px;height:17px}
.logo-icon.small svg{width:14px;height:10px}
.logo-accent{color:var(--accent-light)}

.nav-links{display:flex;gap:28px}
.nav-links a{
  text-decoration:none;color:var(--text-secondary);
  font-size:0.85rem;font-weight:500;
  transition:var(--transition);position:relative;
}
.nav-links a:hover{color:var(--text)}
.nav-links a::after{
  content:'';position:absolute;bottom:-4px;left:0;
  width:0;height:2px;background:var(--accent);
  transition:var(--transition);
}
.nav-links a:hover::after{width:100%}

.nav-actions{display:flex;align-items:center;gap:12px}

.nav-cta{
  display:inline-flex;align-items:center;
  background:var(--accent);color:#fff;
  font-size:0.82rem;font-weight:700;
  padding:9px 20px;border-radius:10px;
  text-decoration:none;
  transition:var(--transition);
  box-shadow:0 2px 16px var(--accent-glow);
}
.nav-cta:hover{
  background:var(--accent-light);
  transform:translateY(-1px);
  box-shadow:0 4px 20px var(--accent-glow);
}

/* Theme toggle */
.theme-toggle{
  width:38px;height:38px;border-radius:50%;
  border:1px solid var(--border);background:var(--toggle-bg);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  font-size:1rem;transition:var(--transition);position:relative;overflow:hidden;
}
.theme-toggle:hover{background:var(--toggle-hover);transform:scale(1.08)}
.theme-toggle:active{transform:scale(0.95)}

.theme-icon-sun,.theme-icon-moon{
  position:absolute;
  transition:transform .4s cubic-bezier(.68,-.55,.27,1.55),opacity .3s;
}
.theme-icon-sun{transform:rotate(0) scale(1);opacity:1}
.theme-icon-moon{transform:rotate(90deg) scale(.5);opacity:0}
body.light-theme .theme-icon-sun{transform:rotate(-90deg) scale(.5);opacity:0}
body.light-theme .theme-icon-moon{transform:rotate(0) scale(1);opacity:1}

/* Burger */
.nav-burger{
  display:none;flex-direction:column;gap:5px;
  background:none;border:none;cursor:pointer;padding:4px;
}
.nav-burger span{
  display:block;width:22px;height:2px;background:var(--text);
  border-radius:2px;transition:var(--transition);
}
.nav-burger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-burger.active span:nth-child(2){opacity:0}
.nav-burger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ========== HERO ========== */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:center;justify-content:center;
  text-align:center;padding:120px 24px 80px;
  overflow:hidden;
  background:var(--hero-bg);
  transition:background .5s;
}

.hero-gradient-orb{
  position:absolute;border-radius:50%;
  filter:blur(80px);pointer-events:none;
  opacity:.4;
}
.orb-1{
  width:500px;height:500px;
  background:var(--accent);
  top:-10%;left:20%;
  animation:orbFloat 8s ease-in-out infinite;
}
.orb-2{
  width:350px;height:350px;
  background:#ff4488;
  bottom:10%;right:15%;
  animation:orbFloat 10s ease-in-out infinite reverse;
}
.orb-3{
  width:250px;height:250px;
  background:#44aaff;
  top:30%;right:30%;
  animation:orbFloat 7s ease-in-out infinite 2s;
}
body.light-theme .hero-gradient-orb{opacity:.2}

@keyframes orbFloat{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(30px,-20px) scale(1.05)}
  66%{transform:translate(-20px,30px) scale(0.95)}
}

.hero-sparkles{position:absolute;inset:0;pointer-events:none}
.hero-sparkles .sparkle{
  position:absolute;
  width:4px;height:4px;
  background:#fff;
  border-radius:50%;
  animation:sparkleAnim 3s ease-in-out infinite;
}
body.light-theme .hero-sparkles .sparkle{background:var(--accent)}

@keyframes sparkleAnim{
  0%,100%{opacity:0;transform:scale(0)}
  50%{opacity:.8;transform:scale(1)}
}

.hero-content{position:relative;z-index:1;max-width:700px}

.hero-title{
  font-size:clamp(2.2rem,6vw,4rem);
  font-weight:900;line-height:1.1;
  letter-spacing:-0.03em;margin-bottom:20px;
  animation:fadeUp .6s ease-out both;
}
.hero-highlight{
  background:linear-gradient(135deg,var(--accent),#b07aff,var(--accent-light));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}

.hero-sub{
  font-size:clamp(0.95rem,1.8vw,1.15rem);
  color:var(--text-secondary);
  max-width:520px;margin:0 auto 36px;
  animation:fadeUp .6s ease-out .1s both;
}

.hero-search{
  display:flex;align-items:center;
  background:var(--search-bg);
  border:1px solid var(--search-border);
  border-radius:14px;padding:6px 6px 6px 18px;
  max-width:560px;margin:0 auto;
  animation:fadeUp .6s ease-out .2s both;
  transition:var(--transition);
}
.hero-search:focus-within{
  border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-glow);
}

.search-icon{
  color:var(--text-dim);flex-shrink:0;margin-right:10px;
  display:flex;
}

.search-input{
  flex:1;background:none;border:none;outline:none;
  color:var(--text);font-size:0.95rem;font-family:inherit;
  padding:10px 0;min-width:0;
}
.search-input::placeholder{color:var(--text-dim)}

.search-btn{
  background:var(--accent);color:#fff;
  border:none;border-radius:10px;
  padding:12px 24px;font-size:0.85rem;
  font-weight:700;font-family:inherit;
  cursor:pointer;white-space:nowrap;
  transition:var(--transition);
  box-shadow:0 2px 12px var(--accent-glow);
}
.search-btn:hover{background:var(--accent-light);transform:translateY(-1px)}

@keyframes fadeUp{
  from{opacity:0;transform:translateY(24px)}
  to{opacity:1;transform:translateY(0)}
}

/* ========== FEATURES (3 cards) ========== */
.features{
  position:relative;z-index:1;
  margin-top:-48px;
  padding-bottom:40px;
}
.features-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
}
.feature-card{
  background:var(--bg-card-solid);
  border:1px solid var(--border-card);
  border-radius:var(--radius);
  padding:28px 24px;
  transition:var(--transition);
  position:relative;
  overflow:hidden;
}
.feature-card::before{
  content:'';position:absolute;top:0;left:0;right:0;
  height:3px;
  background:linear-gradient(90deg,var(--accent),#b07aff,var(--accent));
  opacity:0;transition:var(--transition);
}
.feature-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--card-shadow);
  border-color:rgba(124,92,252,0.3);
}
.feature-card:hover::before{opacity:1}

.feature-icon{
  font-size:1.8rem;margin-bottom:14px;
  width:52px;height:52px;
  display:flex;align-items:center;justify-content:center;
  background:var(--tag-bg);
  border:1px solid var(--tag-border);
  border-radius:14px;
}

.feature-card h3{
  font-size:1.05rem;font-weight:700;margin-bottom:8px;
}
.feature-card p{
  color:var(--text-secondary);font-size:0.88rem;line-height:1.55;
}

/* ========== SECTIONS ========== */
.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:50px}

.section-tag{
  display:inline-block;
  background:var(--tag-bg);border:1px solid var(--tag-border);
  color:var(--tag-color);
  font-size:0.78rem;font-weight:700;letter-spacing:0.04em;
  padding:6px 16px;border-radius:100px;margin-bottom:16px;
}

.section-header h2{
  font-size:clamp(1.6rem,3.5vw,2.2rem);
  font-weight:800;margin-bottom:10px;
}
.section-header p{
  color:var(--text-secondary);font-size:1rem;
  max-width:480px;margin:0 auto;
}

/* ========== 7 STEPS ========== */
.steps-section{background:var(--bg)}

.steps-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:16px;
}

.step-card{
  background:var(--bg-card-solid);
  border:1px solid var(--border-card);
  border-radius:var(--radius);
  padding:28px;
  position:relative;overflow:hidden;
  transition:background .4s,border-color .4s,transform var(--transition),box-shadow var(--transition);
}
.step-card:hover{
  border-color:rgba(124,92,252,0.3);
  transform:translateY(-3px);
  box-shadow:var(--card-shadow);
}

.step-number{
  position:absolute;top:14px;right:18px;
  font-size:2.8rem;font-weight:900;
  color:var(--tag-bg);line-height:1;pointer-events:none;
}

.step-icon{
  font-size:1.6rem;margin-bottom:12px;
  width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;
  background:var(--tag-bg);border:1px solid var(--tag-border);
  border-radius:12px;
}

.step-card h3{font-size:1.05rem;font-weight:700;margin-bottom:8px}
.step-card p{color:var(--text-secondary);font-size:0.9rem;line-height:1.55;margin-bottom:14px}

.step-tag{
  display:inline-block;
  background:var(--tag-bg);
  color:var(--tag-color);
  font-size:0.75rem;font-weight:600;
  padding:4px 12px;border-radius:8px;
}

/* ========== AI SECTION ========== */
.ai-section{background:var(--bg-section-alt);transition:background .4s}

.ai-generator{
  background:var(--bg-card-solid);
  border:1px solid var(--border-card);
  border-radius:var(--radius);
  padding:28px;
  max-width:700px;margin:0 auto;
}

.ai-input-row{display:flex;gap:10px;margin-bottom:16px}

.ai-input{
  flex:1;background:var(--input-bg);
  border:1px solid var(--border);border-radius:12px;
  padding:14px 18px;color:var(--text);
  font-size:0.95rem;font-family:inherit;
  outline:none;transition:var(--transition);
}
.ai-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.ai-input::placeholder{color:var(--text-dim)}

.ai-btn{
  background:linear-gradient(135deg,var(--accent),#b07aff);
  color:#fff;border:none;border-radius:12px;
  padding:14px 28px;font-size:0.9rem;font-weight:700;
  font-family:inherit;cursor:pointer;white-space:nowrap;
  transition:var(--transition);
  box-shadow:0 4px 20px var(--accent-glow);
}
.ai-btn:hover{transform:translateY(-1px);box-shadow:0 6px 24px var(--accent-glow)}
.ai-btn:active{transform:translateY(0)}

.ai-output{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:12px;
  min-height:160px;padding:24px;
  font-size:0.9rem;line-height:1.7;color:var(--text-secondary);
}

.ai-placeholder{
  display:flex;align-items:center;gap:12px;
  color:var(--text-dim);
}
.ai-placeholder-icon{font-size:1.4rem;flex-shrink:0}

.ai-output h4{
  color:var(--text);font-weight:700;margin-bottom:8px;font-size:0.95rem;
}
.ai-output ul{
  list-style:none;padding:0;margin:0 0 16px;
}
.ai-output ul li{
  padding:4px 0 4px 20px;position:relative;
}
.ai-output ul li::before{
  content:'▸';position:absolute;left:0;color:var(--accent);
}
.ai-output .ai-hook{
  background:var(--tag-bg);border:1px solid var(--tag-border);
  border-radius:8px;padding:10px 14px;margin-top:8px;
  font-style:italic;color:var(--tag-color);
}

/* ========== TIPS ========== */
.tips-section{background:var(--bg);transition:background .4s}

.tips-filter{
  display:flex;justify-content:center;gap:8px;
  margin-bottom:36px;flex-wrap:wrap;
}

.filter-btn{
  background:var(--filter-bg);border:1px solid var(--border);
  color:var(--text-secondary);
  font-size:0.82rem;font-weight:600;
  padding:8px 18px;border-radius:100px;
  cursor:pointer;transition:var(--transition);font-family:inherit;
}
.filter-btn:hover{background:var(--filter-hover);color:var(--text)}
.filter-btn.active{
  background:var(--accent);border-color:var(--accent);color:#fff;
  box-shadow:0 2px 12px var(--accent-glow);
}

.tips-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:12px;
}

.tip-card{
  background:var(--bg-card-solid);
  border:1px solid var(--border-card);
  border-radius:var(--radius-sm);
  padding:22px;
  transition:background .4s,border-color .4s,transform var(--transition);
}
.tip-card.hidden{display:none}
.tip-card:hover{
  border-color:rgba(124,92,252,0.3);
  transform:translateY(-2px);
}
.tip-num{font-size:0.75rem;font-weight:700;color:var(--accent-light);margin-bottom:6px}
.tip-card h4{font-size:0.95rem;font-weight:700;margin-bottom:6px}
.tip-card p{color:var(--text-secondary);font-size:0.85rem;line-height:1.5}

/* ========== MONEY ========== */
.money-section{background:var(--bg-section-alt);transition:background .4s}

.money-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:16px;
}

.money-card{
  background:var(--bg-card-solid);
  border:1px solid var(--border-card);
  border-radius:var(--radius);
  padding:24px;
  transition:background .4s,border-color .4s,transform var(--transition);
}
.money-card:hover{
  border-color:rgba(124,92,252,0.3);
  transform:translateY(-3px);
}

.money-icon{font-size:1.8rem;margin-bottom:12px}
.money-card h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.money-card p{color:var(--text-secondary);font-size:0.84rem;line-height:1.5;margin-bottom:14px}

.money-bar-wrap{margin-bottom:10px}
.money-bar-label{
  display:flex;justify-content:space-between;
  font-size:0.72rem;color:var(--text-dim);margin-bottom:5px;font-weight:600;
}
.money-bar{
  height:5px;background:var(--border);border-radius:3px;overflow:hidden;
}
.money-fill{
  height:100%;width:0;
  background:linear-gradient(90deg,var(--accent),#b07aff);
  border-radius:3px;
  transition:width 1.2s cubic-bezier(.4,0,.2,1);
}
.money-range{font-size:0.78rem;color:var(--money-range);font-weight:600}

/* ========== FAQ ========== */
.faq-section{background:var(--bg);transition:background .4s}

.faq-list{max-width:680px;margin:0 auto;display:flex;flex-direction:column;gap:10px}

.faq-item{
  background:var(--bg-card-solid);
  border:1px solid var(--border-card);
  border-radius:var(--radius-sm);overflow:hidden;
  transition:background .4s,border-color .4s;
}
.faq-item.active{border-color:rgba(124,92,252,0.3)}

.faq-question{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  padding:18px 22px;background:none;border:none;
  color:var(--text);font-size:0.95rem;font-weight:600;
  cursor:pointer;text-align:left;font-family:inherit;transition:var(--transition);
}
.faq-question:hover{color:var(--accent-light)}

.faq-toggle{
  width:22px;height:22px;border-radius:50%;
  background:var(--tag-bg);position:relative;flex-shrink:0;
  transition:var(--transition);
}
.faq-toggle::before,.faq-toggle::after{
  content:'';position:absolute;background:var(--accent);border-radius:2px;
}
.faq-toggle::before{width:10px;height:2px;top:10px;left:6px}
.faq-toggle::after{width:2px;height:10px;top:6px;left:10px;transition:var(--transition)}

.faq-item.active .faq-toggle::after{transform:rotate(90deg);opacity:0}

.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s cubic-bezier(.4,0,.2,1)}
.faq-item.active .faq-answer{max-height:300px}
.faq-answer p{
  padding:0 22px 18px;color:var(--text-secondary);
  font-size:0.9rem;line-height:1.65;
}
.faq-answer p strong{color:var(--text)}

/* ========== FOOTER ========== */
.footer{
  border-top:1px solid var(--footer-border);
  padding:32px 0;
  transition:border-color .4s;
}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
}
.footer-brand{
  display:flex;align-items:center;gap:8px;
  color:var(--text);font-size:0.85rem;font-weight:700;
  letter-spacing:0.04em;
}
.footer-brand strong{color:var(--accent-light)}
.footer-copy{color:var(--text-dim);font-size:0.8rem}

/* ========== REVEAL ========== */
.reveal{
  opacity:0;transform:translateY(24px);
  transition:opacity .5s ease-out,transform .5s ease-out;
}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ========== MOBILE ========== */
@media(max-width:900px){
  .features-grid{grid-template-columns:1fr}
}

@media(max-width:768px){
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;
    background:var(--bg-navbar-solid);
    flex-direction:column;align-items:center;gap:0;
    padding:16px 0;border-bottom:1px solid var(--border);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:10px 24px;width:100%;text-align:center;font-size:0.95rem}

  .nav-cta{display:none}
  .nav-burger{display:flex}
  .nav-actions{gap:8px}
  .theme-toggle{width:34px;height:34px;font-size:.9rem}

  .hero-search{flex-direction:column;padding:12px;gap:8px}
  .search-icon{display:none}
  .search-input{text-align:center}
  .search-btn{width:100%;padding:12px}
  .ai-input-row{flex-direction:column}

  .steps-grid,.tips-grid,.money-grid{grid-template-columns:1fr}

  .footer-inner{flex-direction:column;text-align:center}
  .section{padding:50px 0}
}

@media(max-width:480px){
  .hero{padding:100px 16px 60px}
  .hero-title{font-size:2rem}
}