:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --text: #1e293b;
    --text-muted: #64748b;
    --white: #ffffff;
    --border: #e2e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Vazirmatn', Tahoma, sans-serif; }
body { background: var(--bg); color: var(--text); line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header { background: var(--white); box-shadow: 0 1px 3px rgba(0,0,0,0.1); padding: 15px 0; position: sticky; top: 0; z-index: 100; }
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 24px; font-weight: 800; color: var(--primary); display: flex; align-items: center; gap: 8px; text-decoration: none; }
.btn { padding: 10px 24px; border-radius: 8px; border: none; cursor: pointer; font-weight: 600; font-size: 15px; transition: all 0.2s; }
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }

/* Hero */
.hero { padding: 80px 0; text-align: center; background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%); }
.hero h1 { font-size: 48px; font-weight: 800; margin-bottom: 20px; color: var(--text); }
.hero p { font-size: 20px; color: var(--text-muted); max-width: 700px; margin: 0 auto 40px; }

/* Features */
.features { padding: 80px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.feature-card { background: var(--white); padding: 30px; border-radius: 16px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); text-align: center; border: 1px solid var(--border); transition: transform 0.2s; }
.feature-card:hover { transform: translateY(-5px); }
.feature-icon { font-size: 40px; margin-bottom: 20px; display: block; }
.feature-card h3 { font-size: 20px; margin-bottom: 10px; }
.feature-card p { color: var(--text-muted); font-size: 15px; }

/* Modal */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 1000; align-items: center; justify-content: center; backdrop-filter: blur(4px); }
.modal-overlay.active { display: flex; }
.modal { background: var(--white); padding: 40px; border-radius: 20px; width: 100%; max-width: 420px; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1); position: relative; }
.modal h2 { margin-bottom: 10px; font-size: 24px; }
.modal p { color: var(--text-muted); margin-bottom: 25px; font-size: 14px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; font-size: 14px; }
.form-group input { width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: 10px; font-size: 15px; outline: none; transition: border-color 0.2s; }
.form-group input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.close-btn { position: absolute; top: 20px; left: 20px; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-muted); }
.alert { padding: 12px; border-radius: 8px; margin-bottom: 20px; font-size: 14px; display: none; }
.alert-error { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #16a34a; border: 1px solid #bbf7d0; }
.loading { display: none; text-align: center; margin-top: 10px; color: var(--primary); font-size: 14px; }