/* style.css */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

:root {
    --petrol-green: #008080;
    --dark-petrol: #005f5f;
    --light-gray: #f0f2f5;
    --white: #fff;
    --text-color: #333;
    --dark-text: #1a202c;
    --muted-text: #718096;
    --card-bg: #f8fafc;
    --border-color: #e2e8f0;
    --gold: #ffd700;
    --light-gold: #fff9e6;
    --red-alert: #e53e3e;
    --blue-cert: #3182ce;
    --light-blue-cert: #ebf8ff;
    --brown-article: #8B4513;
    --light-brown-article: #fdf5e6;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light-gray);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header ve Menü Stilleri */
.main-header {
    background-color: var(--petrol-green);
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 10px;
    /* İkincil menü için yer açmak için */
}

.logo {
    color: var(--white);
    font-size: 24px;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.main-nav {
    flex-grow: 1;
    display: flex;
    justify-content: flex-end;
}

.main-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 20px;
}

.main-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
    padding: 5px 0;
    white-space: nowrap;
}

.main-menu a:hover {
    color: #c0fefe;
}

/* YENİ: İKİNCİL NAVİGASYON (SECONDARY MENU) STİLLERİ */
.secondary-nav {
    background-color: var(--dark-petrol);
    width: 100%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-top: 0;
}

.secondary-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: flex-start;
    gap: 30px;
    height: 50px;
    align-items: center;
}

.secondary-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    padding: 0 5px;
    transition: color 0.2s;
    font-size: 15px;
    position: relative;
    letter-spacing: 0.5px;
}

.secondary-menu a:hover,
.secondary-menu a.active {
    color: var(--gold);
}

.secondary-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 3px;
    bottom: -5px;
    left: 0;
    background-color: var(--gold);
    transition: width 0.3s ease-out;
}

.secondary-menu a:hover::after,
.secondary-menu a.active::after {
    width: 100%;
}

/* İKİNCİL MENÜ SONU */


/* Ana İçerik Başlığı */
.main-content-area {
    padding-top: 20px;
}

.main-title {
    text-align: center;
    color: var(--dark-petrol);
    margin-bottom: 30px;
    font-weight: 700;
    padding-bottom: 10px;
    display: block;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    font-size: 32px;
}

/* Bölüm Başlığı ve Ayırıcı */
.section-title {
    color: var(--dark-petrol);
    font-size: 28px;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 25px;
    border-left: 5px solid var(--petrol-green);
    padding-left: 15px;
}

.section-divider {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 128, 128, 0), rgba(0, 128, 128, 0.75), rgba(0, 128, 128, 0));
    margin: 40px 0;
}


/* Kategori Sekmeleri (Tabs) Stilleri */
.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.tabs.top-level-tabs {
    border-bottom: none;
    padding: 0;
    margin-bottom: 0;
}

.tabs.top-level-tabs .tab-button {
    background-color: var(--dark-petrol);
    color: var(--white);
    border: 1px solid var(--dark-petrol);
    border-radius: 8px 8px 0 0;
    padding: 12px 25px;
    box-shadow: none;
    margin-bottom: -1px;
}

.tabs.top-level-tabs .tab-button.active {
    background-color: var(--white);
    color: var(--dark-petrol);
    border-color: var(--border-color);
    border-bottom-color: var(--white);
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
}

.tabs.top-level-tabs .tab-button.article-link {
    background-color: var(--petrol-green);
    color: var(--white);
    border-color: var(--petrol-green);
}

.tabs.top-level-tabs .tab-button.article-link:hover {
    background-color: var(--dark-petrol);
}

.tab-button {
    background-color: var(--card-bg);
    color: var(--dark-text);
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.tab-button:hover:not(.active) {
    background-color: #e6f7f7;
    border-color: var(--petrol-green);
}

.tab-button.active {
    background-color: var(--petrol-green);
    color: var(--white);
    border-color: var(--dark-petrol);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.sub-tabs {
    margin-top: 15px;
    border-bottom: none;
    padding-bottom: 0;
}

.sub-tabs .tab-button {
    padding: 8px 16px;
    font-size: 15px;
}

.top-level-content:not(.active) {
    display: none;
}

.top-level-content {
    background: var(--white);
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 0 8px 8px 8px;
}

/* KART TASARIMI */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.video-card {
    background: linear-gradient(145deg, #ffffff, #f8fafc);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease-in-out;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid rgba(0, 128, 128, 0.1);
    position: relative;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0, 128, 128, 0.2);
    border-color: var(--petrol-green);
}

.video-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--petrol-green), var(--dark-petrol));
}

.video-thumbnail-container {
    position: relative;
    overflow: hidden;
    display: block;
}

.video-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.video-card:hover .video-thumbnail {
    transform: scale(1.05);
}

.video-play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(0, 128, 128, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-play-icon::before {
    content: '▶';
    margin-left: 5px;
}

.video-card:hover .video-play-icon {
    opacity: 1;
}

.video-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.video-category {
    background: var(--light-gold);
    color: #b8860b;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    align-self: flex-start;
    border: 1px solid var(--gold);
}

/* Konferans Kartı Stili */
.conference-card .video-category.conference-category {
    background: #e6f0ff;
    color: #4c7ef3;
    border: 1px solid #4c7ef3;
}

.conference-card .teacher-avatar {
    background: var(--red-alert);
}

.conference-card .video-teacher {
    color: var(--dark-petrol);
    font-weight: 600;
    text-decoration: none;
}

.conference-card .video-channel.conference-date {
    color: var(--muted-text);
}

.conference-card .video-channel.conference-date::before {
    content: '🗓️';
}

/* Sertifikasyon Kartı Stili (Harici Link) */
.certification-card {
    border-color: var(--blue-cert);
}

.certification-card::before {
    background: linear-gradient(90deg, var(--blue-cert), var(--dark-petrol));
}

.certification-card .video-category.certification-category {
    background: var(--light-blue-cert);
    color: var(--blue-cert);
    border: 1px solid var(--blue-cert);
}

.certification-card .video-channel {
    color: var(--blue-cert);
    font-weight: 600;
}

.certification-card .video-channel::before {
    content: '🔗';
}

/* Makale Kartı Stili (Blog Tarzı) */
.article-video-card {
    border-color: var(--brown-article);
}

.article-video-card::before {
    background: linear-gradient(90deg, var(--brown-article), #a0522d);
}

.article-video-card .video-category.article-category {
    background: var(--light-brown-article);
    color: var(--brown-article);
    border: 1px solid var(--brown-article);
}

.article-video-card .video-play-icon {
    display: none;
}

.article-video-card .video-channel.article-date::before {
    content: '📅';
}

.article-video-card .video-teacher .teacher-avatar {
    background: var(--brown-article);
}

.article-video-card .video-channel {
    color: var(--muted-text);
}


.video-title {
    font-size: 18px;
    font-weight: 700;
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}

.video-title a:hover {
    color: var(--petrol-green);
}

.video-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.video-teacher {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--dark-text);
}

.teacher-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--petrol-green);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 600;
}

.video-teacher-link {
    color: var(--dark-text) !important;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;

}

.video-teacher-link:hover {
    color: var(--petrol-green) !important;
}

.video-channel {
    font-size: 13px;
    color: var(--muted-text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.video-channel::before {
    content: '📺';
    font-size: 12px;
}

.no-content {
    text-align: center;
    color: var(--muted-text);
    padding: 40px;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    margin-top: 20px;
    background: var(--white);
}

/* Makale Detay Stilleri */
.article-detail-container {
    background-color: var(--white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    margin-top: 30px;
}

.article-detail-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 25px;
}

.article-detail-header h1 {
    color: var(--dark-text);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.article-detail-meta {
    color: var(--muted-text);
    font-size: 14px;
    margin-bottom: 20px;
}

.article-detail-content p {
    line-height: 1.8;
    margin-bottom: 20px;
}

/* Konferans Detay Stilleri */
.conference-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
    background: #f0fafa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    font-size: 16px;
    align-items: center;
    justify-content: space-between;
}

.conference-info-grid strong {
    color: var(--dark-petrol);
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Konferans Videoları Başlık Stili Düzeltmesi (Detay Sayfası için) */
.article-detail-container .section-title {
    color: var(--dark-text);
    font-size: 24px;
    border-left: 4px solid var(--dark-petrol);
    margin-top: 40px;
    margin-bottom: 20px;
}

/* ========================================= */
/* ADMIN PANEL LAYOUT STYLES - DÜZELTME EKİ */
/* ========================================= */

.admin-page {
    display: flex;
    background-color: var(--light-gray);
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: var(--dark-petrol);
    color: var(--white);
    padding: 20px 0;
    flex-shrink: 0;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar h2 {
    color: var(--white);
    text-align: center;
    margin-bottom: 20px;
    padding: 0 15px;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li a {
    display: block;
    padding: 12px 20px;
    color: #c0fefe;
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
    font-weight: 600;
    border-left: 3px solid transparent;
}

.sidebar-menu li a:hover:not(.active) {
    background-color: #007070;
    color: var(--white);
}

.sidebar-menu li a.active {
    background-color: var(--petrol-green);
    color: var(--white);
    border-left: 3px solid var(--gold);
}

.main-content {
    flex-grow: 1;
    padding: 30px;
    background-color: var(--light-gray);
}

.main-content h2 {
    color: var(--dark-petrol);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* Admin List Group Stilleri */
.list-group {
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    margin-top: 15px;
}

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.1s;
}

.list-item:hover {
    background-color: #f7f7f7;
}

.list-item:last-child {
    border-bottom: none;
}

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

.actions button,
.actions a.edit-btn {
    padding: 8px 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
    text-decoration: none;
    display: inline-block;
}

.actions button[type="submit"] {
    background-color: var(--red-alert);
    color: white;
}

.actions button[type="submit"]:hover {
    background-color: #c53030;
}

.actions a.edit-btn,
.actions button.edit-btn {
    background-color: var(--blue-cert);
    color: white;
}

.actions a.edit-btn:hover,
.actions button.edit-btn:hover {
    background-color: #2b6cb0;
}

/* Admin Form Stilleri */
.admin-form label {
    display: block;
    margin-top: 10px;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--dark-text);
}

.admin-form input[type="text"],
.admin-form textarea,
.admin-form select,
.edit-input-group input[type="text"],
.edit-input-group select {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 16px;
}

.admin-form textarea {
    min-height: 150px;
}

.admin-form-btn {
    background-color: var(--petrol-green);
    color: var(--white);
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-weight: 600;
    margin-top: 10px;
    display: inline-block;
}

.admin-form-btn:hover {
    background-color: var(--dark-petrol);
}

/* Sürükle Bırak Listesi Stilleri */
.category-list,
.video-list,
#menu-sort-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-item,
.video-item,
.menu-item {
    background: #fff;
    border: 1px solid #eee;
    margin-bottom: 5px;
    padding: 10px;
    border-radius: 4px;
    cursor: grab;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Mobil Uyumluluk */
@media (max-width: 900px) {
    .admin-page {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        padding-bottom: 0;
    }

    .sidebar h2 {
        display: none;
    }

    .sidebar-menu {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .sidebar-menu li a {
        border-left: none;
        padding: 10px 15px;
    }

    .sidebar-menu li a.active {
        border-bottom: 3px solid var(--gold);
        border-left: none;
    }

    .main-content {
        padding: 20px 15px;
    }

    .list-item,
    .category-item,
    .video-item,
    .menu-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .actions {
        margin-top: 5px;
    }

    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        justify-content: flex-start;
    }

    .secondary-menu {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 0;
    }

    .secondary-menu a {
        font-size: 14px;
    }
}

/* Makale Kartı Stilleri (Eksik olanlar eklendi) */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.article-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.article-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-info {
    padding: 20px;
}

.article-title {
    font-size: 18px;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.1s;
}

.list-item:hover {
    background-color: #f7f7f7;
}

.list-item:last-child {
    border-bottom: none;
}

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

.actions button,
.actions a.edit-btn {
    padding: 8px 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
    text-decoration: none;
    display: inline-block;
}

.actions button[type="submit"] {
    background-color: var(--red-alert);
    color: white;
}

.actions button[type="submit"]:hover {
    background-color: #c53030;
}

.actions a.edit-btn,
.actions button.edit-btn {
    background-color: var(--blue-cert);
    color: white;
}

.actions a.edit-btn:hover,
.actions button.edit-btn:hover {
    background-color: #2b6cb0;
}

/* Admin Form Stilleri */
.admin-form label {
    display: block;
    margin-top: 10px;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--dark-text);
}

.admin-form input[type="text"],
.admin-form textarea,
.admin-form select,
.edit-input-group input[type="text"],
.edit-input-group select {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 16px;
}

.admin-form textarea {
    min-height: 150px;
}

.admin-form-btn {
    background-color: var(--petrol-green);
    color: var(--white);
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-weight: 600;
    margin-top: 10px;
    display: inline-block;
}

.admin-form-btn:hover {
    background-color: var(--dark-petrol);
}

/* Sürükle Bırak Listesi Stilleri */
.category-list,
.video-list,
#menu-sort-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-item,
.video-item,
.menu-item {
    background: #fff;
    border: 1px solid #eee;
    margin-bottom: 5px;
    padding: 10px;
    border-radius: 4px;
    cursor: grab;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Mobil Uyumluluk */
@media (max-width: 900px) {
    .admin-page {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        padding-bottom: 0;
    }

    .sidebar h2 {
        display: none;
    }

    .sidebar-menu {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .sidebar-menu li a {
        border-left: none;
        padding: 10px 15px;
    }

    .sidebar-menu li a.active {
        border-bottom: 3px solid var(--gold);
        border-left: none;
    }

    .main-content {
        padding: 20px 15px;
    }

    .list-item,
    .category-item,
    .video-item,
    .menu-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .actions {
        margin-top: 5px;
    }

    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        justify-content: flex-start;
    }

    .secondary-menu {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 0;
    }

    .secondary-menu a {
        font-size: 14px;
    }
}

/* Makale Kartı Stilleri (Eksik olanlar eklendi) */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.article-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.article-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-info {
    padding: 20px;
}

.article-title {
    font-size: 18px;
    font-weight: 700;
    gap: 30px;
    padding: 20px 0;
}

.teacher-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    text-align: center;
}

.teacher-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--petrol-green);
}

.teacher-image-container {
    width: 100%;
    height: 250px;
    overflow: hidden;
    background-color: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.teacher-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.teacher-card:hover .teacher-image {
    transform: scale(1.05);
}

.teacher-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--petrol-green);
    color: var(--white);
    font-size: 64px;
    font-weight: 700;
}

.teacher-info {
    padding: 20px;
}

.teacher-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-text);
    margin: 0 0 10px 0;
    text-decoration: none;
}

#menu-sort-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-item,
.video-item,
.menu-item {
    background: #fff;
    border: 1px solid #eee;
    margin-bottom: 5px;
    padding: 10px;
    border-radius: 4px;
    cursor: grab;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Mobil Uyumluluk */
@media (max-width: 900px) {
    .admin-page {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        padding-bottom: 0;
    }

    .sidebar h2 {
        display: none;
    }

    .sidebar-menu {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .sidebar-menu li a {
        border-left: none;
        padding: 10px 15px;
    }

    .sidebar-menu li a.active {
        border-bottom: 3px solid var(--gold);
        border-left: none;
    }

    .main-content {
        padding: 20px 15px;
    }

    .list-item,
    .category-item,
    .video-item,
    .menu-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .actions {
        margin-top: 5px;
    }

    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        justify-content: flex-start;
    }

    .secondary-menu {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 0;
    }

    .secondary-menu a {
        font-size: 14px;
    }
}

/* Makale Kartı Stilleri (Eksik olanlar eklendi) */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.article-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.article-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-info {
    padding: 20px;
}

.article-title {
    font-size: 18px;
    font-weight: 700;
    gap: 30px;
    padding: 20px 0;
}

.teacher-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.teacher-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    text-align: center;
}

.teacher-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--petrol-green);
}

.teacher-image-container {
    width: 100%;
    height: 250px;
    overflow: hidden;
    background-color: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.teacher-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.teacher-card:hover .teacher-image {
    transform: scale(1.05);
}

.teacher-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--petrol-green);
    color: var(--white);
    font-size: 64px;
    font-weight: 700;
}

.teacher-info {
    padding: 20px;
}

.teacher-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-text);
    margin: 0 0 10px 0;
}

.teacher-title {
    font-size: 14px;
    color: var(--muted-text);
    margin: 0;
    line-height: 1.5;
}

/* Jumbotron / Banner Stilleri */
.jumbotron {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 100px;
    padding: 60px 0;
    margin-bottom: 40px;
}

.jumbotron-content {
    flex: 1;
    padding-right: 20px;
}

.jumbotron h1 {
    font-size: 3rem;

    .sidebar {
        width: 100%;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        padding-bottom: 0;
    }

    .sidebar h2 {
        display: none;
    }

    .sidebar-menu {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .sidebar-menu li a {
        border-left: none;
        padding: 10px 15px;
    }

    .sidebar-menu li a.active {
        border-bottom: 3px solid var(--gold);
        border-left: none;
    }

    .main-content {
        padding: 20px 15px;
    }

    .list-item,
    .category-item,
    .video-item,
    .menu-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .actions {
        margin-top: 5px;
    }

    .header-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        justify-content: flex-start;
    }

    .secondary-menu {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 0;
    }

    .secondary-menu a {
        font-size: 14px;
    }

    /* Makale Kartı Stilleri (Eksik olanlar eklendi) */
    .article-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
        gap: 30px;
        padding: 20px 0;
    }

    .article-card {
        background: var(--white);
        border-radius: 12px;
        overflow: hidden;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        text-decoration: none;
        color: var(--text-color);
        display: flex;
        flex-direction: column;
        border: 1px solid var(--border-color);
    }

    .article-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

    .article-thumbnail {
        width: 100%;
        height: 200px;
        object-fit: cover;
    }

    .article-info {
        padding: 20px;
    }

    .article-title {
        font-size: 18px;
        font-weight: 700;
        gap: 30px;
        padding: 20px 0;
    }

    .teacher-card {
        background: var(--white);
        border-radius: 12px;
        overflow: hidden;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        text-decoration: none;
        color: var(--text-color);
        display: flex;
        flex-direction: column;
        border: 1px solid var(--border-color);
        text-align: center;
    }

    .teacher-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        border-color: var(--petrol-green);
    }

    .teacher-image-container {
        width: 100%;
        height: 250px;
        overflow: hidden;
        background-color: var(--light-gray);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .teacher-image {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.3s ease;
    }

    .teacher-card:hover .teacher-image {
        transform: scale(1.05);
    }

    .teacher-placeholder {
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: var(--petrol-green);
        color: var(--white);
        font-size: 64px;
        font-weight: 700;
    }

    .teacher-info {
        padding: 20px;
    }

    .teacher-name {
        font-size: 20px;
        font-weight: 700;
        color: var(--dark-text);
        margin: 0 0 10px 0;
    }

    .teacher-title {
        font-size: 14px;
        color: var(--muted-text);
        margin: 0;
        line-height: 1.5;
    }

    /* Jumbotron / Banner Stilleri */
    .jumbotron {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 100px;
        padding: 60px 0;
        margin-bottom: 40px;
    }

    .jumbotron-content {
        flex: 1;
        padding-right: 20px;
    }

    .jumbotron h1 {
        font-size: 3rem;
        color: var(--dark-petrol);
        margin-bottom: 20px;
        line-height: 1.2;
    }

    .jumbotron p {
        font-size: 1.2rem;
        object-fit: cover;
    }

    @media (max-width: 900px) {
        .jumbotron {
            flex-direction: column;
            text-align: center;
            padding: 40px 20px;
            gap: 30px;
        }

        .jumbotron-content {
            padding-right: 0;
        }

        .jumbotron-image {
            justify-content: center;
            max-width: 100%;
            margin-top: 30px;
            flex: auto;
        }

        .jumbotron p {
            margin-left: auto;
            margin-right: auto;
        }
    }

    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-section h3 {
    color: var(--gold);
    font-size: 18px;
    margin-bottom: 15px;
    font-weight: 700;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color 0.3s, padding-left 0.3s;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--gold);
    padding-left: 5px;
}

.main-footer {
    background: var(--petrol-green);
    color: var(--white);
    padding: 50px 0 20px;
    margin-top: 80px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    padding-top: 20px;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    font-size: 14px;
}

.powered-by {
    display: flex;
    align-items: center;
    gap: 10px;
}

.powered-by span {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.powered-by a {
    display: flex;
    align-items: center;
    transition: transform 0.3s, opacity 0.3s;
}

.powered-by a:hover {
    transform: translateY(-2px);
    opacity: 0.8;
}

.dasgrafik-logo {
    height: 30px;
    width: auto;
    filter: brightness(0) invert(1);
    transition: filter 0.3s;
}

.powered-by a:hover .dasgrafik-logo {
    filter: brightness(0) invert(1) sepia(1) saturate(5) hue-rotate(30deg);
}

/* Footer top: three columns */
.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.footer-section {
    flex: 1;
    min-width: 200px;
    /* ensure reasonable width */
}

/* Footer bottom: left copy, right powered */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding: 20px 0;
}

.footer-copy,
.footer-powered {
    flex: 1;
    min-width: 200px;
}

.footer-powered {
    text-align: right;
}

@media (max-width: 768px) {

    .footer-content,
    .footer-bottom {
        font-weight: 700;
        color: var(--dark-text);
        margin: 0 0 10px 0;
    }

    .teacher-title {
        font-size: 14px;
        color: var(--muted-text);
        margin: 0;
        line-height: 1.5;
    }

    /* Jumbotron / Banner Stilleri */
    .jumbotron {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 100px;
        padding: 60px 0;
        margin-bottom: 40px;
    }

    .jumbotron-content {
        flex: 1;
        padding-right: 20px;
    }

    .jumbotron h1 {
        font-size: 3rem;
        color: var(--dark-petrol);
        margin-bottom: 20px;
        line-height: 1.2;
    }

    .jumbotron p {
        font-size: 1.2rem;
        object-fit: cover;
    }

    @media (max-width: 900px) {
        .jumbotron {
            flex-direction: column;
            text-align: center;
            padding: 40px 20px;
            gap: 30px;
        }

        .jumbotron-content {
            padding-right: 0;
        }

        .jumbotron-image {
            justify-content: center;
            max-width: 100%;
            margin-top: 30px;
            flex: auto;
        }

        .jumbotron p {
            margin-left: auto;
            margin-right: auto;
        }
    }

    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-section h3 {
    color: var(--gold);
    font-size: 18px;
    margin-bottom: 15px;
    font-weight: 700;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color 0.3s, padding-left 0.3s;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--gold);
    padding-left: 5px;
}

.main-footer {
    background: var(--petrol-green);
    color: var(--white);
    padding: 50px 0 20px;
    margin-top: 80px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    padding-top: 20px;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    font-size: 14px;
}

.powered-by {
    display: flex;
    align-items: center;
    gap: 10px;
}

.powered-by span {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.powered-by a {
    display: flex;
    align-items: center;
    transition: transform 0.3s, opacity 0.3s;
}

.powered-by a:hover {
    transform: translateY(-2px);
    opacity: 0.8;
}

.dasgrafik-logo {
    height: 30px;
    width: auto;
    filter: brightness(0) invert(1);
    transition: filter 0.3s;
}

.powered-by a:hover .dasgrafik-logo {
    filter: brightness(0) invert(1) sepia(1) saturate(5) hue-rotate(30deg);
}

/* Footer top: three columns */
.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.footer-section {
    flex: 1;
    min-width: 200px;
    /* ensure reasonable width */
}

/* Footer bottom: left copy, right powered */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding: 20px 0;
}

.footer-copy,
.footer-powered {
    flex: 1;
    min-width: 200px;
}

.footer-powered {
    text-align: right;
}

@media (max-width: 768px) {

    .footer-content,
    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-powered {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding: 20px 0;
}

.footer-copy,
.footer-powered {
    flex: 1;
    min-width: 200px;
}

.footer-powered {
    text-align: right;
}

@media (max-width: 768px) {

    .footer-content,
    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-powered {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .powered-by {
        justify-content: center;
    }
}

/* ========================================= */
/* MOBİL UYUMLULUK (RESPONSIVE) STİLLERİ */
/* ========================================= */

@media (max-width: 768px) {

    /* Genel Ayarlar */
    body {
        padding-bottom: 80px;
        /* Alt navigasyon için boşluk */
    }

    .container {
        padding: 0 15px;
        width: auto;
    }

    /* Header Düzenlemeleri */
    .main-header {
        padding: 10px 0;
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .header-container {
        justify-content: center;
        padding-bottom: 0;
    }

    .logo {
        font-size: 20px;
    }

    /* Masaüstü Menüleri Gizle */
    .main-nav,
    .secondary-nav {
        display: none;
    }

    /* Jumbotron (Banner) */
    .jumbotron {
        padding: 30px 20px;
        text-align: center;
        border-radius: 0;
        margin: 0 -15px 20px -15px;
    }

    .jumbotron h1 {
        font-size: 24px;
    }

    .jumbotron p {
        font-size: 16px;
    }

    /* Sekmeler (Tabs) - Yatay Kaydırma */
    .tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 15px;
        -webkit-overflow-scrolling: touch;
        /* iOS için akıcı kaydırma */
        scrollbar-width: none;
        /* Firefox */
        margin-left: -15px;
        margin-right: -15px;
        padding-left: 15px;
        padding-right: 15px;
    }

    .tabs::-webkit-scrollbar {
        display: none;
        /* Chrome/Safari */
    }

    .tab-button {
        flex: 0 0 auto;
        /* Daralmayı önle */
        white-space: nowrap;
        font-size: 14px;
        padding: 8px 16px;
    }

    /* Video Grid - Tek Sütun */
    .video-grid {
        grid-template-columns: 1fr;
        /* Tek sütun */
        gap: 20px;
    }

    .video-card {
        margin-bottom: 10px;
    }

    .video-thumbnail {
        height: 180px;
    }

    /* Alt Navigasyon (Bottom Nav) */
    .mobile-bottom-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background-color: var(--white);
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
        display: flex;
        justify-content: space-around;
        align-items: center;
        height: 65px;
        z-index: 1001;
        padding-bottom: env(safe-area-inset-bottom);
        /* iPhone X+ uyumu */
    }

    .nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        color: var(--muted-text);
        font-size: 11px;
        font-weight: 600;
        width: 20%;
        height: 100%;
        transition: color 0.2s;
    }

    .nav-item.active {
        color: var(--petrol-green);
        border-top: 3px solid var(--petrol-green);
        padding-top: 0;
    }

    .nav-icon {
        font-size: 24px;
        margin-bottom: 4px;
    }

    /* Footer Düzenlemesi */
    .main-footer {
        padding-bottom: 80px;
        /* Alt nav altında kalmasın */
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-section {
        margin-bottom: 30px;
    }

    /* Konferans Detay Mobilde */
    .conference-info-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
}