:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --dark: #0f172a;
    --light: #f8fafc;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', sans-serif; }
body { background-color: var(--light); color: var(--dark); overflow-x: hidden; }

/* Navbar */
.navbar { background: #fff; padding: 20px 50px; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 100;}
.logo { font-size: 28px; font-weight: 700; color: var(--dark); text-decoration: none; letter-spacing: -1px;}
.logo span { color: var(--primary); }
.nav-buttons { display: flex; gap: 15px; }
.btn { padding: 10px 25px; border-radius: 8px; font-weight: 600; cursor: pointer; transition: 0.3s; text-decoration: none; border: none; font-size: 15px;}
.btn-outline { border: 2px solid var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-solid { background: var(--primary); color: #fff; }
.btn-solid:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);}

/* Hero Section */
.hero { height: calc(100vh - 85px); display: flex; align-items: center; justify-content: center; text-align: center; background: linear-gradient(135deg, #eff6ff 0%, #fff 100%); padding: 20px; }
.hero-content h1 { font-size: 54px; margin-bottom: 20px; color: var(--dark); line-height: 1.2; }
.hero-content p { font-size: 18px; color: #64748b; max-width: 600px; margin: 0 auto 30px auto; }

/* Modals (Popuplar) */
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(15, 23, 42, 0.7); backdrop-filter: blur(5px); justify-content: center; align-items: center; }
.modal.active { display: flex; }
.modal-box { background: #fff; padding: 40px; border-radius: 16px; width: 400px; max-width: 90%; position: relative; animation: slideUp 0.3s ease-out; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }
@keyframes slideUp { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.close-btn { position: absolute; top: 15px; right: 20px; font-size: 24px; cursor: pointer; color: #94a3b8; background: none; border: none; }
.close-btn:hover { color: #ef4444; }
.modal-title { font-size: 24px; font-weight: 700; margin-bottom: 25px; text-align: center; color: var(--dark); }

/* Form Elemanları */
.input-group { margin-bottom: 20px; }
.input-group label { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 500; color: #475569; }
.input-group input { width: 100%; padding: 12px 15px; border: 1px solid #cbd5e1; border-radius: 8px; outline: none; font-size: 15px; background: #f8fafc; transition: 0.3s; }
.input-group input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }
.submit-btn { width: 100%; padding: 14px; background: var(--primary); color: #fff; border: none; border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.3s; }
.submit-btn:hover { background: var(--primary-hover); }

.alert { padding: 12px; border-radius: 8px; margin-bottom: 20px; font-size: 14px; text-align: center; }
.alert.error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

@media (max-width: 768px) {
    .navbar { padding: 20px; flex-direction: column; gap: 15px; }
    .hero-content h1 { font-size: 36px; }
}