*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#ffffff;
  --bg-alt:#f8f9fa;
  --text:#1a1a2e;
  --text-muted:#6c757d;
  --accent:#4361ee;
  --accent-hover:#3a56d4;
  --card-bg:#ffffff;
  --card-border:#e9ecef;
  --header-bg:rgba(255,255,255,0.95);
  --footer-bg:#1a1a2e;
  --footer-text:#adb5bd;
  --border:#e9ecef;
  --radius:12px;
  --shadow:0 2px 12px rgba(0,0,0,0.08);
  --max-width:1100px;
  --transition:0.3s ease;
}

[data-theme="dark"]{
  --bg:#0f0f1a;
  --bg-alt:#1a1a2e;
  --text:#e8e8f0;
  --text-muted:#9ca3af;
  --accent:#6c8cff;
  --accent-hover:#5a7af0;
  --card-bg:#1a1a2e;
  --card-border:#2a2a3e;
  --header-bg:rgba(15,15,26,0.95);
  --footer-bg:#0a0a14;
  --footer-text:#6c757d;
  --border:#2a2a3e;
}

html{scroll-behavior:smooth}

body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  transition:background var(--transition),color var(--transition);
}

a{color:var(--accent);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent-hover)}

img{max-width:100%;height:auto}

.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}

/* Header */
header{
  position:sticky;top:0;z-index:100;
  background:var(--header-bg);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  transition:background var(--transition);
}

.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;
}

.logo{font-size:1.25rem;font-weight:700;color:var(--text)}
.logo span{color:var(--accent)}

nav{display:flex;align-items:center;gap:24px}
nav a{color:var(--text-muted);font-size:0.95rem;font-weight:500}
nav a:hover,nav a.active{color:var(--accent)}

.theme-toggle{
  background:none;border:2px solid var(--border);border-radius:50%;
  width:36px;height:36px;cursor:pointer;display:flex;align-items:center;
  justify-content:center;font-size:1.1rem;color:var(--text);
  transition:border var(--transition),color var(--transition);
}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}

.mobile-toggle{
  display:none;background:none;border:none;cursor:pointer;
  flex-direction:column;gap:5px;padding:4px;
}
.mobile-toggle span{
  display:block;width:24px;height:2px;background:var(--text);
  transition:transform var(--transition),opacity var(--transition);
}

/* Hero */
.hero{
  padding:80px 0 60px;text-align:center;
  background:linear-gradient(135deg,var(--bg-alt) 0%,var(--bg) 100%);
}

.hero h1{font-size:clamp(2rem,5vw,3rem);margin-bottom:16px;font-weight:800}
.hero h1 span{color:var(--accent)}

.hero p{
  font-size:clamp(1rem,2.5vw,1.2rem);color:var(--text-muted);
  max-width:600px;margin:0 auto 32px;
}

.btn{
  display:inline-block;padding:12px 28px;border-radius:8px;
  font-weight:600;font-size:0.95rem;transition:all var(--transition);
  cursor:pointer;border:none;
}

.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-1px)}

.btn-outline{border:2px solid var(--accent);color:var(--accent);background:transparent}
.btn-outline:hover{background:var(--accent);color:#fff}

.hero-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* Sections */
section{padding:60px 0}
section:nth-child(even){background:var(--bg-alt)}

.section-title{
  font-size:clamp(1.5rem,3vw,2rem);text-align:center;margin-bottom:40px;font-weight:700;
}

/* App Cards */
.app-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));
  gap:24px;
}

.app-card{
  background:var(--card-bg);border:1px solid var(--card-border);
  border-radius:var(--radius);padding:28px;
  transition:transform var(--transition),box-shadow var(--transition);
}
.app-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}

.app-card h3{font-size:1.25rem;margin-bottom:8px}
.app-card .app-icon{
  width:64px;height:64px;border-radius:16px;
  background:var(--accent);display:flex;align-items:center;
  justify-content:center;font-size:1.5rem;color:#fff;margin-bottom:16px;
}
.app-card p{color:var(--text-muted);margin-bottom:16px;font-size:0.95rem}
.app-card .tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.app-card .tag{
  padding:4px 12px;border-radius:20px;font-size:0.8rem;
  background:var(--bg-alt);color:var(--text-muted);
  border:1px solid var(--border);
}

/* App Detail Page */
.app-hero{padding:60px 0 40px}
.app-hero-inner{display:flex;gap:32px;align-items:flex-start;flex-wrap:wrap}
.app-hero .app-icon-lg{
  width:120px;height:120px;border-radius:24px;flex-shrink:0;
  background:var(--accent);display:flex;align-items:center;
  justify-content:center;font-size:3rem;color:#fff;
}
.app-hero-info{flex:1;min-width:280px}
.app-hero-info h1{font-size:2rem;margin-bottom:8px}
.app-hero-info .developer{color:var(--text-muted);margin-bottom:16px}
.app-hero-actions{display:flex;gap:12px;flex-wrap:wrap}

.features-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:20px;
}
.feature-item{
  background:var(--card-bg);border:1px solid var(--card-border);
  border-radius:var(--radius);padding:24px;
}
.feature-item h4{margin-bottom:8px}
.feature-item p{color:var(--text-muted);font-size:0.9rem}

/* Privacy Policy */
.privacy-content{
  max-width:800px;margin:0 auto;
  padding:60px 20px;
}
.privacy-content h1{font-size:2rem;margin-bottom:8px}
.privacy-content .last-updated{color:var(--text-muted);margin-bottom:32px}
.privacy-content h2{font-size:1.3rem;margin:32px 0 12px;color:var(--accent)}
.privacy-content p,.privacy-content ul{color:var(--text);margin-bottom:16px;line-height:1.8}
.privacy-content ul{padding-left:24px}
.privacy-content li{margin-bottom:8px}

/* Contact */
.contact-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:24px;max-width:800px;margin:0 auto;
}

.contact-card{
  background:var(--card-bg);border:1px solid var(--card-border);
  border-radius:var(--radius);padding:28px;text-align:center;
}
.contact-card .icon{
  width:48px;height:48px;border-radius:50%;
  background:var(--accent);display:flex;align-items:center;
  justify-content:center;margin:0 auto 16px;font-size:1.2rem;color:#fff;
}
.contact-card h3{margin-bottom:8px;font-size:1.1rem}
.contact-card p{color:var(--text-muted);font-size:0.9rem}
.contact-card a{font-weight:500}

/* Footer */
footer{
  background:var(--footer-bg);color:var(--footer-text);
  padding:40px 0 24px;margin-top:auto;
}
.footer-inner{
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:16px;
}
.footer-links{display:flex;gap:20px}
.footer-links a{color:var(--footer-text);font-size:0.9rem}
.footer-links a:hover{color:#fff}
.footer-bottom{
  margin-top:24px;padding-top:20px;border-top:1px solid rgba(255,255,255,0.1);
  text-align:center;font-size:0.85rem;
}

/* Page Header */
.page-header{
  padding:48px 0 32px;text-align:center;
  background:var(--bg-alt);border-bottom:1px solid var(--border);
}
.page-header h1{font-size:clamp(1.5rem,3vw,2rem)}
.page-header p{color:var(--text-muted);margin-top:8px}

/* Responsive */
@media(max-width:768px){
  nav{display:none;position:absolute;top:64px;left:0;right:0;
    background:var(--header-bg);flex-direction:column;
    padding:20px;gap:16px;border-bottom:1px solid var(--border);
    backdrop-filter:blur(12px);
  }
  nav.open{display:flex}
  .mobile-toggle{display:flex}
  .hero{padding:48px 0 40px}
  .app-hero-inner{flex-direction:column;align-items:center;text-align:center}
  .app-hero-actions{justify-content:center}
  .footer-inner{flex-direction:column;text-align:center}
}