:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --primary-color: #f97316;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --border-color: #334155;
    --input-bg: #334155;
    --nav-bg: #1e293b;
}

/* 1. TEMEL RESET VE NATIVE APP HİSSİYATI */
* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; 
    -webkit-tap-highlight-color: transparent; /* Mobilde dokunma anındaki mavi flaşı engeller */
}

body { 
    background-color: var(--bg-color); 
    color: var(--text-color); 
    display: flex; 
    justify-content: center; 
    min-height: 100vh;
    overscroll-behavior-y: none; /* Mobilde web sitesi gibi esnemeyi/sekmeyi kapatır */
}

/* TÜM LİNKLERDEN ALT ÇİZGİYİ KALDIRMA (+ İkonu altındaki çizgiyi de bu çözer) */
a {
    text-decoration: none !important;
    color: inherit;
}

/* 2. ANA TAŞIYICI VE YAPI */
.app-wrapper { width: 100%; max-width: 600px; background-color: var(--bg-color); min-height: 100vh; display: flex; flex-direction: column; position: relative; padding-bottom: 90px; border-left: 1px solid var(--border-color); border-right: 1px solid var(--border-color); }

.header { padding: 18px 20px; background-color: var(--card-bg); border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 50; user-select: none; }
.header h1 { font-size: 18px; font-weight: 800; color: var(--primary-color); letter-spacing: 0.5px; }

.container { padding: 20px; flex: 1; }

/* 3. FORM VE KART TASARIMLARI */
.form-card { background-color: var(--card-bg); padding: 20px; border-radius: 14px; border: 1px solid var(--border-color); margin-bottom: 20px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; margin-bottom: 6px; color: var(--text-muted); }
.form-control { width: 100%; padding: 12px 14px; background-color: var(--input-bg); border: 1px solid var(--border-color); border-radius: 10px; color: var(--text-color); outline: none; font-size: 16px; transition: border-color 0.2s, box-shadow 0.2s; }
.form-control:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1); }

/* 4. BUTONLAR VE ETKİLEŞİM */
.btn-save, .btn-action { width: 100%; padding: 14px; font-size: 16px; font-weight: 600; color: white; border: none; border-radius: 10px; cursor: pointer; transition: transform 0.1s, opacity 0.2s; user-select: none; }
.btn-save:active, .btn-action:active { transform: scale(0.98); }

/* 5. ALT NAVİGASYON (MENÜ) - PREMIUM MOBİL GÖRÜNÜM */
.bottom-nav { 
    position: fixed; 
    bottom: 0; 
    width: 100%; 
    max-width: 600px; 
    background-color: rgba(30, 41, 59, 0.95); /* Hafif şeffaf modern arka plan */
    backdrop-filter: blur(10px); /* Arka planı flulaştırma efekti */
    display: flex; 
    justify-content: space-around; 
    align-items: center; 
    padding: 14px 0; /* Menü yüksekliği büyütüldü */
    border-top: 1px solid var(--border-color); 
    padding-bottom: env(safe-area-inset-bottom, 16px); /* Yeni nesil telefonlar için güvenli alan */
    z-index: 100; 
    user-select: none;
    box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.3); /* Alttan yukarı şık gölge */
}

.nav-item { 
    text-decoration: none !important; 
    color: var(--text-muted); 
    font-size: 12px; /* Yazı boyutu hafif büyütüldü */
    font-weight: 500;
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    gap: 6px; 
    flex: 1; 
    transition: color 0.2s, transform 0.1s;
}

.nav-item i {
    font-size: 20px; /* İkonlar daha belirgin yapıldı */
}

.nav-item.active { 
    color: var(--primary-color); 
    font-weight: 700;
}

/* ANA EKLEME BUTONU (FAB) */
.fab-button { 
    background-color: var(--primary-color); 
    color: white !important; 
    width: 54px; /* Buton büyütüldü */
    height: 54px; 
    border-radius: 50%; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    margin-top: -32px; /* Yukarı doğru daha belirgin taşma */
    box-shadow: 0 6px 16px rgba(249, 115, 22, 0.5); 
    border: 4px solid var(--bg-color); 
    transition: transform 0.1s; 
    text-decoration: none !important; 
}

.fab-button i {
    font-size: 22px;
}

.fab-button:active { 
    transform: scale(0.88); 
}

/* 6. YARDIMCI SINIFLAR */
.text-danger { color: var(--danger-color); }
.text-success { color: var(--success-color); }

/* 7. DİNAMİK HARF AVATARI (Senin Kodun Korundu) */
.harf-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    border: 2px solid var(--card-bg);
}