/* Duru Bilgisayar Sistemleri - Ana Stil Dosyasi */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 15px;
    color: #333;
    background: #f5f5f5;
    line-height: 1.6;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    color: #004499;
}

#header {
    background: #1a3a6b;
    padding: 0;
    position: relative;
}

#header-top {
    background: #122850;
    padding: 6px 20px;
    font-size: 13px;
    color: #aac4e8;
    text-align: right;
}

#header-main {
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1100px;
    margin: 0 auto;
}

#logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

#logo .logo-icon {
    width: 60px;
    height: 60px;
    background: #0077dd;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: white;
    font-weight: bold;
    flex-shrink: 0;
}

#logo-text h1 {
    font-size: 22px;
    font-weight: 700;
    color: #ffffff;
    line-height: 1.2;
    letter-spacing: 0.5px;
}

#logo-text span {
    font-size: 13px;
    color: #aac4e8;
    display: block;
    margin-top: 2px;
}

#header-contact {
    color: #aac4e8;
    text-align: right;
    font-size: 13px;
    line-height: 1.8;
}

#header-contact strong {
    color: #fff;
    font-size: 15px;
}

#nav {
    background: #0055aa;
    border-bottom: 3px solid #ff6600;
}

#nav ul {
    list-style: none;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
}

#nav ul li a {
    display: block;
    color: #fff;
    padding: 13px 20px;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.2s;
    text-decoration: none;
}

#nav ul li a:hover,
#nav ul li.active a {
    background: #ff6600;
    color: #fff;
    text-decoration: none;
}

#breadcrumb {
    background: #e8eef5;
    border-bottom: 1px solid #ccd8e8;
    padding: 8px 20px;
    font-size: 13px;
    color: #666;
}

#breadcrumb a {
    color: #0055aa;
}

#banner {
    background: linear-gradient(135deg, #1a3a6b 0%, #0055aa 60%, #0077dd 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

#banner h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 14px;
    position: relative;
}

#banner p {
    font-size: 17px;
    color: #c0d8f5;
    max-width: 600px;
    margin: 0 auto 24px;
    position: relative;
}

#banner .btn-primary {
    display: inline-block;
    background: #ff6600;
    color: white;
    padding: 12px 30px;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    margin: 4px;
}

#banner .btn-primary:hover {
    background: #e55500;
    text-decoration: none;
}

#banner .btn-secondary {
    display: inline-block;
    background: transparent;
    color: white;
    padding: 12px 30px;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid rgba(255,255,255,0.5);
    margin: 4px;
}

#banner .btn-secondary:hover {
    background: rgba(255,255,255,0.15);
    text-decoration: none;
}

#wrapper {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

#content-area {
    display: flex;
    gap: 24px;
    padding: 28px 0;
}

#main-content {
    flex: 1;
    min-width: 0;
}

#sidebar {
    width: 260px;
    flex-shrink: 0;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    color: #1a3a6b;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 3px solid #0055aa;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-bottom: 28px;
}

.service-card {
    background: #fff;
    border: 1px solid #dde6f0;
    border-radius: 6px;
    padding: 22px 18px;
    text-align: center;
}

.service-card:hover {
    box-shadow: 0 4px 16px rgba(0,85,170,0.12);
}

.service-card .icon {
    font-size: 36px;
    margin-bottom: 12px;
    display: block;
}

.service-card h3 {
    font-size: 15px;
    font-weight: 600;
    color: #1a3a6b;
    margin-bottom: 8px;
}

.service-card p {
    font-size: 13px;
    color: #666;
    line-height: 1.5;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.feature-box {
    background: #fff;
    border-left: 4px solid #0055aa;
    padding: 16px 18px;
    border-radius: 0 6px 6px 0;
}

.feature-box h4 {
    font-size: 14px;
    font-weight: 600;
    color: #1a3a6b;
    margin-bottom: 6px;
}

.feature-box p {
    font-size: 13px;
    color: #555;
    line-height: 1.5;
}

.content-block {
    background: #fff;
    border: 1px solid #dde6f0;
    border-radius: 6px;
    padding: 22px;
    margin-bottom: 20px;
}

.content-block p {
    color: #444;
    line-height: 1.7;
    margin-bottom: 12px;
}

.content-block p:last-child {
    margin-bottom: 0;
}

.content-block ul, .content-block ol {
    padding-left: 22px;
    color: #444;
    line-height: 1.8;
}

.product-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    margin-bottom: 20px;
}

.product-table th {
    background: #1a3a6b;
    color: white;
    padding: 12px 14px;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
}

.product-table td {
    padding: 11px 14px;
    border-bottom: 1px solid #eef2f8;
    font-size: 14px;
    color: #333;
}

.product-table tr:last-child td {
    border-bottom: none;
}

.product-table tr:hover td {
    background: #f0f5fb;
}

.sidebar-box {
    background: #fff;
    border: 1px solid #dde6f0;
    border-radius: 6px;
    margin-bottom: 18px;
    overflow: hidden;
}

.sidebar-box .sidebar-title {
    background: #1a3a6b;
    color: white;
    padding: 11px 16px;
    font-size: 14px;
    font-weight: 600;
}

.sidebar-box .sidebar-content {
    padding: 14px 16px;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    border-bottom: 1px solid #eef2f8;
}

.sidebar-menu li:last-child {
    border-bottom: none;
}

.sidebar-menu li a {
    display: block;
    padding: 9px 4px;
    color: #333;
    font-size: 14px;
    text-decoration: none;
}

.sidebar-menu li a:hover {
    color: #0055aa;
    text-decoration: none;
    padding-left: 8px;
}

.sidebar-menu li a::before {
    content: "bb ";
    color: #0055aa;
    font-size: 10px;
}

.contact-info {
    font-size: 13px;
    color: #444;
    line-height: 2;
}

.contact-info strong {
    color: #1a3a6b;
    display: block;
    margin-top: 6px;
}

#stats-bar {
    background: #1a3a6b;
    color: white;
    padding: 24px 20px;
}

#stats-bar .stats-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    text-align: center;
    flex-wrap: wrap;
    gap: 16px;
}

.stat-item .stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: #ff6600;
    line-height: 1;
}

.stat-item .stat-label {
    font-size: 13px;
    color: #aac4e8;
    margin-top: 4px;
}

#footer {
    background: #122850;
    color: #aac4e8;
    padding: 30px 20px 0;
}

#footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 30px;
    padding-bottom: 24px;
}

#footer h4 {
    color: white;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 2px solid #ff6600;
    display: inline-block;
}

#footer p, #footer li {
    font-size: 13px;
    line-height: 1.8;
    color: #8aa8cc;
}

#footer ul {
    list-style: none;
}

#footer ul li a {
    color: #8aa8cc;
    font-size: 13px;
    text-decoration: none;
}

#footer ul li a:hover {
    color: #fff;
    text-decoration: none;
}

#footer ul li::before {
    content: "c ";
    color: #ff6600;
}

#footer-bottom {
    background: #0a1f3d;
    padding: 12px 20px;
    text-align: center;
    font-size: 12px;
    color: #566d8a;
    margin-top: 10px;
}

.contact-form {
    background: #fff;
    padding: 24px;
    border-radius: 6px;
    border: 1px solid #dde6f0;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #1a3a6b;
    margin-bottom: 5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid #c5d5e8;
    border-radius: 4px;
    font-size: 14px;
    color: #333;
    font-family: inherit;
}

.form-group textarea {
    height: 110px;
    resize: vertical;
}

.btn-submit {
    background: #0055aa;
    color: white;
    border: none;
    padding: 11px 28px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
}

.btn-submit:hover {
    background: #003d80;
}

.page-content h2 {
    font-size: 24px;
    color: #1a3a6b;
    margin-bottom: 16px;
    font-weight: 700;
}

.page-content h3 {
    font-size: 18px;
    color: #1a3a6b;
    margin: 20px 0 10px;
    font-weight: 600;
}

.alert-box {
    background: #e8f0fb;
    border-left: 4px solid #0055aa;
    padding: 14px 18px;
    border-radius: 0 6px 6px 0;
    margin-bottom: 20px;
    font-size: 14px;
    color: #1a3a6b;
}

@media (max-width: 768px) {
    .service-grid { grid-template-columns: 1fr 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    #content-area { flex-direction: column; }
    #sidebar { width: 100%; }
    #footer-inner { grid-template-columns: 1fr 1fr; }
    #header-main { flex-direction: column; gap: 12px; text-align: center; }
    #header-contact { text-align: center; }
}

@media (max-width: 480px) {
    .service-grid { grid-template-columns: 1fr; }
    #footer-inner { grid-template-columns: 1fr; }
    #banner h2 { font-size: 24px; }
}