:root {
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --text-main: #0F172A;
    --text-muted: #334155;
    --border: #E2E8F0;
    --border-strong: #CBD5E1;
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-light: #EFF6FF;
    --success: #16A34A;
    --success-light: #F0FDF4;
    --warning: #D97706;
    --warning-light: #FFFBEB;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.45;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Kapsayıcı ve Viewport Düzeni */
.app-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Üst Başlık & Bar */
.navbar {
    background: #FFFFFF;
    border-bottom: 1px solid var(--border);
    padding: 10px 16px;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.brand-badge {
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid #BFDBFE;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Buton Standartları (Koyu buton yok, sade tek hiza) */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 7px 14px;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: #FFFFFF;
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-outline {
    background: #FFFFFF;
    color: var(--text-main);
    border-color: var(--border-strong);
}

.btn-outline:hover {
    background: #F1F5F9;
}

.btn-success {
    background: var(--success);
    color: #FFFFFF;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.8rem;
}

/* Sekmeler (Ürünler / Hizmetlerimiz) */
.tab-group {
    display: flex;
    gap: 8px;
    margin: 12px 0 16px 0;
    border-bottom: 2px solid var(--border);
    padding-bottom: 8px;
}

.tab-btn {
    background: none;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.tab-btn.active {
    background: var(--primary-light);
    color: var(--primary);
}

/* Ürün Grid - Kompakt ve Çoklu Ekran Uyumlu */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 14px;
}

.item-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.item-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #BFDBFE;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 8px;
}

.item-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
}

.item-badge {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid #BFDBFE;
}

.item-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.4;
    flex: 1;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.item-price {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--success);
}

.btn-group {
    display: flex;
    gap: 6px;
}

/* Modal / Teklif Penceresi */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 12px;
}

.modal-box {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.modal-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.modal-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
}

.form-group {
    margin-bottom: 11px;
}

.form-label {
    display: block;
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 4px;
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    font-size: 0.875rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    background: #FFFFFF;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Toast Bildirimi (alert yerine) */
#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: #FFFFFF;
    border: 1px solid var(--border-strong);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    animation: fadeIn 0.2s ease-out;
}

.toast-success {
    border-left: 4px solid var(--success);
}

.toast-error {
    border-left: 4px solid #DC2626;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Alt Bilgi */
.footer {
    background: #FFFFFF;
    border-top: 1px solid var(--border);
    padding: 12px 16px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}