:root{
  --bg:#0f172a; --bg2:#1e293b; --card:#fff; --ink:#0f172a; --muted:#64748b;
  --brand:#2563eb; --brand-d:#1d4ed8; --ok:#16a34a; --bad:#dc2626; --line:#e2e8f0;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:#f8fafc;line-height:1.55}
a{color:var(--brand);text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.container-narrow{max-width:560px}
.center{text-align:center}
.muted{color:var(--muted)}

/* Header */
.site-header{background:var(--bg);color:#fff;position:sticky;top:0;z-index:10}
.site-header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{color:#fff;font-weight:800;font-size:22px;letter-spacing:.5px}
.site-nav{display:flex;align-items:center;gap:22px}
.site-nav a{color:#cbd5e1}
.site-nav a:hover{color:#fff}

/* Hero */
.hero{background:linear-gradient(160deg,#0f172a,#1e3a8a);color:#fff;padding:80px 0;text-align:center}
.hero h1{font-size:42px;margin:0 0 14px}
.hero-sub{font-size:18px;color:#cbd5e1;max-width:620px;margin:0 auto 28px}

/* Sections */
.section{padding:64px 0}
.section-alt{background:#eef2ff}
.section-title{text-align:center;font-size:30px;margin:0 0 36px}

/* Pricing */
.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.pricing-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:0 6px 24px rgba(2,6,23,.05);display:flex;flex-direction:column}
.pricing-card h3{margin:0 0 8px;font-size:22px}
.price{font-size:30px;font-weight:800;margin-bottom:18px}
.price-period{font-size:14px;font-weight:500;color:var(--muted)}
.feature-list{list-style:none;padding:0;margin:0 0 22px;flex:1}
.feature-list li{padding:6px 0;border-bottom:1px dashed var(--line)}
.feature-list li.off{color:#94a3b8}
.feature-list li.on{color:var(--ink)}

/* Forms */
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:0 6px 24px rgba(2,6,23,.05)}
.form label{display:block;margin-bottom:16px;font-weight:600;font-size:14px}
.form input,.form select{width:100%;margin-top:6px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-weight:400}
.form input:focus,.form select:focus{outline:2px solid var(--brand);border-color:var(--brand)}

/* Buttons */
.btn{display:inline-block;padding:10px 18px;border-radius:10px;font-weight:600;cursor:pointer;border:1px solid transparent;font-size:15px;text-align:center}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-d)}
.btn-outline{border-color:#334155;color:#fff}
.btn-outline:hover{background:#1e293b}
.btn-lg{padding:13px 26px;font-size:16px}
.btn-block{display:block;width:100%}

/* Alerts */
.alert{padding:12px 16px;border-radius:10px;margin-bottom:18px;font-weight:500}
.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.alert-success{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}

/* Demo modül seçimi */
.module-pick{border:1px solid var(--line);border-radius:10px;padding:14px;margin-bottom:16px}
.module-pick legend{font-weight:600;font-size:14px;padding:0 6px}
.module-pick .chk{display:inline-flex;align-items:center;gap:6px;margin:6px 14px 6px 0;font-weight:500}
.module-pick .chk input{width:auto;margin:0}
.center{text-align:center}
code{background:#eef2ff;padding:2px 8px;border-radius:6px;font-weight:600}
.small{font-size:13px}

/* Footer */
.site-footer{background:var(--bg);color:#94a3b8;text-align:center;padding:28px 0;margin-top:40px}