:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --primary: #35e889;
    --primary-hover: #2bc574;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }
body { background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6; }

/* HEADER */
header { display: flex; justify-content: space-between; align-items: center; padding: 20px 5%; border-bottom: 1px solid var(--border); background: rgba(15, 23, 42, 0.9); position: sticky; top: 0; z-index: 100; backdrop-filter: blur(10px); }
.logo { font-size: 24px; font-weight: 900; color: white; display: flex; align-items: center; gap: 10px; }
.logo span { color: var(--primary); }
nav { display: flex; gap: 20px; }
nav a { color: var(--text-main); text-decoration: none; font-weight: 500; transition: color 0.2s; }
nav a:hover { color: var(--primary); }

/* HERO SECTION */
.hero { text-align: center; padding: 100px 20px; background: radial-gradient(circle at 50% 0%, #1e293b 0%, #0f172a 70%); }
.hero h1 { font-size: 48px; margin-bottom: 20px; font-weight: 800; background: linear-gradient(45deg, #fff, #35e889); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 20px; color: var(--text-muted); max-width: 600px; margin: 0 auto 40px auto; }

/* BUTONLAR */
.btn { padding: 14px 28px; border-radius: 8px; font-size: 16px; font-weight: 700; cursor: pointer; text-decoration: none; transition: all 0.2s; border: none; display: inline-block; text-align: center; }
.btn-primary { background: var(--primary); color: #000; box-shadow: 0 4px 15px rgba(53, 232, 137, 0.3); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }
.btn-outline { border: 2px solid var(--border); color: var(--text-main); background: transparent; margin-left: 15px; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-silver { background: #a0aec0; color: black; }
.btn-gold { background: #d4af37; color: black; }

/* MOCKUP GÖRSELİ */
.mockup-container { max-width: 1000px; margin: -40px auto 60px auto; border-radius: 12px; overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,0.5); border: 1px solid var(--border); }
.mockup-container img { width: 100%; display: block; background: var(--bg-card); min-height: 400px; object-fit: cover; }

/* ÖZELLİKLER (FEATURES) */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; padding: 60px 5%; max-width: 1200px; margin: auto; }
.feature-card { background: var(--bg-card); padding: 30px; border-radius: 12px; border: 1px solid var(--border); }
.feature-card h3 { color: var(--primary); margin-bottom: 15px; font-size: 22px; }
.feature-card p { color: var(--text-muted); }

/* FİYATLANDIRMA (PRICING) */
.pricing-section { padding: 80px 5%; text-align: center; background: #131c31; }
.pricing-grid { display: flex; justify-content: center; gap: 40px; max-width: 900px; margin: 40px auto 0 auto; flex-wrap: wrap; }
.pricing-card { background: var(--bg-card); border: 1px solid var(--border); padding: 40px; border-radius: 12px; flex: 1; min-width: 250px; text-align: left; position: relative; }
.pricing-card.silver { border-color: #a0aec0; }
.pricing-card.gold { border-color: #d4af37; box-shadow: 0 0 30px rgba(212, 175, 55, 0.15); }

/* MODAL / POP-UP */
#auth-modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); z-index: 999; align-items: center; justify-content: center; backdrop-filter: blur(5px); }
.auth-box { background: var(--bg-card); padding: 40px; border-radius: 12px; width: 100%; max-width: 400px; border: 1px solid var(--border); position: relative; }
.modal-input { width: 100%; padding: 12px; border-radius: 6px; border: 1px solid var(--border); background: var(--bg-dark); color: white; outline: none; margin-bottom: 15px; }
.modal-input:focus { border-color: var(--primary); }
.close-modal { position: absolute; top: 15px; right: 15px; background: none; border: none; color: white; font-size: 24px; cursor: pointer; }
/* GİRİŞ VE KAYIT SEKMELERİ */
.auth-tabs { display: flex; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.auth-tab { flex: 1; padding: 10px; background: transparent; border: none; color: var(--text-muted); font-size: 16px; font-weight: bold; cursor: pointer; border-bottom: 2px solid transparent; transition: 0.3s; }
.auth-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.error-msg { color: #e53e3e; font-size: 13px; margin-bottom: 15px; display: none; text-align: center; }