/* --- style.css - Modern Dark/Gray Theme --- */

/* Google Fonts - Modern Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary-gradient: linear-gradient(135deg, #2c2c2c 0%, #4a4a4a 100%);
    --card-gradient: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);
    --hover-gradient: linear-gradient(145deg, #f8f9fa 0%, #ffffff 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.16);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.nav-link {
    text-transform: uppercase;
}

.article-list a,
.feature-card {
    text-decoration: none;
    color: #212529;
}

.content-icon,
footer {
    text-align: center;
}

.nav-link-header {
    color: rgba(255, 255, 255, .90);
}

.cards-container {
    margin-top: -40px;
}

/* GENEL GÖVDE - Modern */
body {
    background: linear-gradient(180deg, #f5f7fa 0%, #e4e8ec 100%);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: #212529;
    min-height: 100vh;
}

/* KARTLAR - Modern Design */
.feature-card {
    background: var(--card-gradient);
    border: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    padding: 32px 24px;
    transition: var(--transition-smooth);
    height: 100%;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    color: #000;
    border-color: rgba(44, 44, 44, 0.2);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

/* İKONLAR - Modern */
.card-icon {
    font-size: 2.75rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 18px;
    transition: var(--transition-bounce);
    filter: drop-shadow(0 2px 4px rgba(44, 44, 44, 0.3));
}

.feature-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 4px 12px rgba(44, 44, 44, 0.5));
}

.card-title {
    font-weight: 700;
    font-size: 1.3rem;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.card-meta {
    font-size: 0.9rem;
    color: #6c757d;
    line-height: 1.5;
}

.content-section {
    padding: 40px 0;
}

.section-heading {
    font-weight: 800;
    font-size: 1.4rem;
    margin-bottom: 32px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    border-bottom: 3px solid rgba(44, 44, 44, 0.2);
    padding-bottom: 14px;
    display: inline-block;
    letter-spacing: -0.03em;
}

/* LİSTE LİNKLERİ - Modern */
.article-list {
    list-style: none;
    padding: 0;
}

.article-list li {
    margin-bottom: 12px;
    border-bottom: 1px solid #f0f0f0;
    padding-bottom: 12px;
}

.article-list a {
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    transition: var(--transition-smooth);
    color: #495057;
    padding: 12px 16px;
    border-radius: 10px;
}

.article-list a:hover {
    color: #000;
    background: rgba(44, 44, 44, 0.05);
    padding-left: 20px;
}

.article-icon {
    color: #2c2c2c;
    margin-right: 10px;
    font-size: 1rem;
    transition: var(--transition-smooth);
}

.article-list a:hover .article-icon {
    transform: translateX(4px);
}

/* HERO SECTION - Modern Design (HEADER KORUNDU) */
.hero-section {
    background: linear-gradient(135deg, #1a1a1a, #434343);
    padding-top: 10px;
    padding-bottom: 60px;
    color: #fff;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(44, 44, 44, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(74, 74, 74, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: #fff !important;
}

.nav-link {
    font-weight: 500;
    font-size: .9rem;
    transition: color .3s;
}

.nav-link:hover {
    /*color: #d1d1d1 !important;*/
}
.nav-link.nav-link-header.active{
    color:#666;
}
.nav-link.nav-link-header:hover{
    color:#666;
}

.hero-title {
    font-weight: 800;
    font-size: 2.75rem;
    margin-top: 40px;
    margin-bottom: 16px;
    letter-spacing: -0.03em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-weight: 300;
    font-size: 1.15rem;
    opacity: 0.95;
    margin-bottom: 28px;
    letter-spacing: 0.02em;
}

/* ARAMA ALANI - Modern */
.search-container {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.search-input {
    height: 56px;
    border-radius: 14px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    padding-left: 24px;
    padding-right: 140px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    color: #333;
    font-size: 1rem;
    transition: var(--transition-smooth);
    backdrop-filter: blur(10px);
}

.search-input:focus {
    outline: none;
    border-color: rgba(44, 44, 44, 0.5);
    box-shadow: 0 8px 40px rgba(44, 44, 44, 0.3);
    transform: translateY(-2px);
}

.search-btn {
    position: absolute;
    right: 6px;
    top: 6px;
    bottom: 6px;
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    border-radius: 10px;
    padding: 0 28px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 16px rgba(44, 44, 44, 0.4);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(44, 44, 44, 0.6);
}

/* SOL MENÜ (KATEGORİLER) */
.category-list .list-group-item {
    border: none;
    background: 0 0;
    font-weight: 600;
    color: #666; /* Normal Gri */
    cursor: pointer;
    transition: .2s;
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 5px;
}

.category-list .list-group-item:hover {
    background-color: #e2e6ea;
    color: #000;
}

.category-list .list-group-item.active {
    background-color: #212529; /* Aktif Kategori Siyah */
    color: #fff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, .2);
}

/* SEKMELER (TABS) */
.nav-pills .nav-link {
    color: #495057;
    font-weight: 600;
    border-radius: 20px;
    padding: 8px 20px;
    margin-right: 10px;
    background: #fff;
    border: 1px solid #dee2e6;
    transition: .2s;
}

.nav-pills .nav-link:hover {
    background-color: #e9ecef;
    color: #000;
}

.nav-pills .nav-link.active {
    background-color: #000; /* Aktif Sekme Siyah */
    color: #fff;
    border-color: #000;
}

/* İÇERİK KARTLARI (LİSTE) */
.content-card {
    background: #fff;
    border-radius: 12px;
    border: none;
    box-shadow: 0 2px 15px rgba(0, 0, 0, .05);
    transition: .3s;
    margin-bottom: 15px;
}

.content-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, .1);
}

.content-link {
    text-decoration: none;
    color: #212529; /* Koyu Gri */
    display: block;
    padding-top: 18px;
    padding-bottom: 18px;
    padding-left: 20px;
    padding-right: 20px;
    display: flex;
    align-items: center;
}

.content-icon {
    font-size: 1.5rem;
    color: #343a40; /* Koyu Gri İkon */
    margin-right: 15px;
    width: 30px;
}

.content-title {
    font-weight: 600;
    font-size: 1.05rem;
}

/* HOVERDA BAŞLIK RENGİ */
.title-hover {
    transition: color 0.2s;
}
.content-card:hover .title-hover {
    color: #000 !important; /* Kart üzerine gelince başlık tam siyah */
}
.content-card:hover .text-primary {
    color: #212529 !important; /* Bootstrap primary rengini eziyoruz */
}

footer {
    font-size: 0.9rem;
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
    padding: 40px 0;
    margin-top: 60px;
    border-top: 2px solid rgba(44, 44, 44, 0.1);
    color: #6c757d;
}

/* LOGO VE BAŞLIK DÜZENLEMESİ */
.brand-container {
    display: flex !important;
    flex-direction: column; /* Alt alta sırala */
    align-items: center;    /* Ortala */
    line-height: 1.2;       /* Satır aralığını sıkılaştır */
    padding-top: 0;
    padding-bottom: 0;
}

.brand-logo {
    max-height: 50px;       /* Logo yüksekliğini buradan ayarlayabilirsiniz */
    width: auto;            /* Genişlik orantılı kalsın */
    margin-bottom: 5px;     /* Yazı ile logo arasındaki boşluk */
    
}

.brand-text {
    font-size: 1rem;        /* Yazı boyutunu küçülttük ki logoyla dengeli dursun */
    font-weight: 600;
    color: #fff;            /* Yazı rengi beyaz */
    letter-spacing: 0.5px;
}

/* Mobilde logo çok büyük kalmasın diye */
@media (max-width: 991px) {
    .brand-logo {
        max-height: 40px;
    }
    .brand-text {
        font-size: 0.9rem;
    }
}

/* KARTLAR ENGINEERING - Modern Compact Design */
.feature-card-engineering {
    background: var(--card-gradient);
    border: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
    padding: 16px 18px;
    transition: var(--transition-smooth);
    height: 100%;
    cursor: pointer;
    display: block;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: #212529;
}

.feature-card-engineering::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-gradient);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.feature-card-engineering:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    color: #000;
    border-color: rgba(102, 126, 234, 0.25);
    background: var(--hover-gradient);
}

.feature-card-engineering:hover::before {
    transform: scaleY(1);
}

/* Engineering Icon Wrapper */
.engineering-icon-wrapper {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.engineering-icon-wrapper i {
    font-size: 1.25rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition-smooth);
}

.feature-card-engineering:hover .engineering-icon-wrapper {
    background: var(--primary-gradient);
    transform: scale(1.05);
}

.feature-card-engineering:hover .engineering-icon-wrapper i {
    -webkit-text-fill-color: #fff;
    color: #fff;
}

/* Engineering Content */
.engineering-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 3px;
    letter-spacing: -0.01em;
    color: #212529;
    transition: var(--transition-smooth);
}

.engineering-subtitle {
    font-size: 0.8rem;
    color: #6c757d;
    line-height: 1.3;
    transition: var(--transition-smooth);
}

.feature-card-engineering:hover .engineering-title {
    color: #667eea;
}

.feature-card-engineering:hover .engineering-subtitle {
    color: #495057;
}

/* Engineering Arrow */
.engineering-arrow {
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition-smooth);
    color: #667eea;
    font-size: 0.85rem;
}

.feature-card-engineering:hover .engineering-arrow {
    opacity: 1;
    transform: translateX(0);
}

.accordion-button.group-accordion-button {
    color: #2c3e50!important;
}
.accordion-button.group-accordion-button.collapsed {
    color: #2c3e50!important;
    background-color: #fcfcfc!important;
}

/* TOOL CARDS - Modern Grid Design */
.tool-card {
    display: block;
    text-decoration: none;
    color: #212529;
}

.tool-card-inner {
    background: var(--card-gradient);
    border: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    padding: 20px 22px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.tool-card-inner::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-gradient);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.tool-card:hover .tool-card-inner {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: rgba(44, 44, 44, 0.2);
    background: var(--hover-gradient);
}

.tool-card:hover .tool-card-inner::before {
    transform: scaleY(1);
}

/* Tool Icon Wrapper */
.tool-icon-wrapper {
    width: 52px;
    height: 52px;
    min-width: 52px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(44, 44, 44, 0.08) 0%, rgba(74, 74, 74, 0.08) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.tool-icon-wrapper i {
    font-size: 1.4rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition-smooth);
}

.tool-card:hover .tool-icon-wrapper {
    background: var(--primary-gradient);
    transform: scale(1.08);
}

.tool-card:hover .tool-icon-wrapper i {
    -webkit-text-fill-color: #fff;
    color: #fff;
}

/* Tool Content */
.tool-content {
    flex: 1;
    min-width: 0;
}

.tool-title {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 4px;
    letter-spacing: -0.01em;
    color: #212529;
    transition: var(--transition-smooth);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tool-subtitle {
    font-size: 0.8rem;
    color: #6c757d;
    line-height: 1.3;
    transition: var(--transition-smooth);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tool-card:hover .tool-title {
    color: #2c2c2c;
}

.tool-card:hover .tool-subtitle {
    color: #212529;
}

/* Tool Arrow */
.tool-arrow {
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition-smooth);
    color: #2c2c2c;
    font-size: 0.75rem;
}

.tool-card:hover .tool-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Tooltip Customization */
.tooltip {
    font-size: 0.85rem;
}

.tooltip-inner {
    background: linear-gradient(135deg, #1a1a1a, #434343);
    padding: 8px 14px;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.tooltip .tooltip-arrow {
    display: none;
}