* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --dark: #1f2937;
    --light: #f9fafb;
    --white: #ffffff;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--gray-800);
    line-height: 1.6;
}

.konteyner {
    display: grid;
    grid-template-columns: 280px 1fr;
    grid-template-rows: 80px 1fr;
    grid-template-areas: 
        "sidebar header"
        "sidebar main";
    min-height: 100vh;
}

.ust-bar {
    grid-area: header;
    background: var(--white);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    box-shadow: var(--shadow);
    z-index: 10;
}

.ust-bar h1 {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tarih {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--gray-600);
    font-weight: 500;
    background: var(--gray-100);
    padding: 8px 16px;
    border-radius: 20px;
}

.tarih::before {
    content: "📅";
    font-size: 16px;
}

.yan-menu {
    grid-area: sidebar;
    background: var(--white);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--gray-200);
    padding: 32px 0;
    box-shadow: var(--shadow);
}

.menu-logo {
    text-align: center;
    margin-bottom: 32px;
    padding: 0 24px;
}

.menu-logo h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.yan-menu ul {
    list-style: none;
    padding: 0 16px;
}

.yan-menu ul li {
    margin-bottom: 8px;
}

.yan-menu ul li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    color: var(--gray-600);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.yan-menu ul li a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
    z-index: -1;
}

.yan-menu ul li a:hover::before,
.yan-menu ul li a.aktif::before {
    width: 100%;
}

.yan-menu ul li a:hover,
.yan-menu ul li a.aktif {
    color: var(--white);
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.menu-icon {
    font-size: 18px;
    width: 20px;
    text-align: center;
}

.ana-icerik {
    grid-area: main;
    padding: 32px;
    overflow-y: auto;
    background: var(--light);
}

.sayfa {
    display: none;
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 24px;
}

.sayfa.aktif {
    display: block;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sayfa-baslik {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--gray-200);
}

.sayfa-baslik h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--gray-900);
}

.kart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.kart {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 28px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.kart::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.kart:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.kart h3 {
    font-size: 14px;
    margin-bottom: 16px;
    color: var(--gray-500);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kart .sayi {
    font-size: 36px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.kart-aciklama {
    font-size: 12px;
    color: var(--gray-400);
    font-weight: 500;
}

.hizli-islemler {
    margin-top: 32px;
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--shadow);
}

.hizli-islemler h3 {
    color: var(--gray-900);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hizli-islemler h3::before {
    content: "⚡";
    font-size: 24px;
}

.hizli-butonlar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border: none;
    padding: 16px 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: var(--shadow);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-birincil {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.btn-ikincil {
    background: linear-gradient(135deg, var(--gray-500), var(--gray-600));
}

.btn-basari {
    background: linear-gradient(135deg, var(--success), #059669);
}

.btn-uyari {
    background: linear-gradient(135deg, var(--warning), #d97706);
}

.btn-tehlike {
    background: linear-gradient(135deg, var(--danger), #dc2626);
}

.btn-bilgi {
    background: linear-gradient(135deg, var(--info), #0891b2);
}

.btn-kucuk {
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 600;
    margin-right: 8px;
}

.form-grup {
    margin-bottom: 24px;
}

.form-grup label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--gray-700);
    font-size: 14px;
}

.form-grup input,
.form-grup select,
.form-grup textarea {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: var(--transition);
    background: var(--white);
    color: var(--gray-800);
}

.form-grup input:focus,
.form-grup select:focus,
.form-grup textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.form-butonlar {
    display: flex;
    gap: 16px;
    margin-top: 32px;
}

.tablo-konteyner {
    overflow-x: auto;
    margin-top: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.tablo {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.tablo thead {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.tablo th {
    padding: 20px;
    text-align: left;
    font-weight: 700;
    color: var(--white);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tablo td {
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
    color: var(--gray-800);
    font-weight: 500;
}

.tablo tbody tr:hover {
    background: var(--gray-100);
}

.tablo tbody tr:last-child td {
    border-bottom: none;
}

.musteri-form,
.urun-form,
.satis-form {
    background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.7));
    backdrop-filter: blur(20px);
    padding: 32px;
    border-radius: var(--border-radius);
    margin-bottom: 32px;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
}

.musteri-form h3,
.urun-form h3,
.satis-form h3 {
    margin-bottom: 24px;
    color: var(--gray-900);
    font-weight: 800;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.gizli {
    display: none !important;
}

.rapor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.rapor-kart {
    background: var(--white);
    padding: 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
    transition: var(--transition);
}

.rapor-kart:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.rapor-kart h3 {
    color: var(--gray-900);
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: 700;
}

.rapor-icerik p {
    margin-bottom: 12px;
    color: var(--gray-600);
    font-size: 16px;
    font-weight: 500;
}

.alert {
    padding: 20px 24px;
    margin-bottom: 32px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow);
}

.alert-basari {
    color: #065f46;
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border-left: 4px solid var(--success);
}

.alert-basari::before {
    content: "✅";
    font-size: 18px;
}

.alert-hata {
    color: #991b1b;
    background: linear-gradient(135deg, #fef2f2, #fee2e2);
    border-left: 4px solid var(--danger);
}

.alert-hata::before {
    content: "❌";
    font-size: 18px;
}

@media (max-width: 768px) {
    .konteyner {
        grid-template-columns: 1fr;
        grid-template-rows: 70px auto 1fr;
        grid-template-areas: 
            "header"
            "sidebar"
            "main";
    }
    
    .yan-menu {
        padding: 16px 0;
        overflow-x: auto;
    }
    
    .yan-menu ul {
        display: flex;
        padding: 0 16px;
        gap: 8px;
    }
    
    .yan-menu ul li {
        white-space: nowrap;
        margin-bottom: 0;
    }
    
    .ana-icerik {
        padding: 20px;
    }
    
    .kart-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 16px;
    }
    
    .hizli-butonlar {
        grid-template-columns: 1fr;
    }
    
    .form-butonlar {
        flex-direction: column;
    }
}