/* ============================================
   GENEL STILLER
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Ana renkler - ASOTEK temasına benzer mavi tonları */
    --primary-color: #0066cc;
    --secondary-color: #004d99;
    --accent-color: #ff9800;
    --text-dark: #333;
    --text-light: #666;
    --bg-light: #f5f7fa;
    --white: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    display: block;
    opacity: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 2rem 0;
    box-shadow: 0 2px 10px var(--shadow);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.logo p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* ============================================
   VIDEO SECTION
   ============================================ */
.video-section {
    padding: 4rem 0;
    background-color: var(--white);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.video-container {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 40px var(--shadow);
}

.video-container iframe {
    width: 100%;
    height: 500px;
    display: block;
}

.video-note {
    background-color: var(--accent-color);
    color: var(--white);
    padding: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-section {
    padding: 4rem 0;
    background-color: var(--bg-light);
}

.project-card {
    background-color: var(--white);
    border-radius: 15px;
    margin-bottom: 2rem;
    box-shadow: 0 5px 20px var(--shadow);
    overflow: hidden;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow-hover);
}

.project-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 1.5rem 2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.project-header:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.project-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-date {
    font-size: 0.9rem;
    opacity: 0.9;
}

.toggle-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.toggle-icon.rotated {
    transform: rotate(180deg);
}

.project-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    padding: 0 2rem;
}

.project-content.active {
    max-height: 2000px;
    padding: 2rem;
}

/* ============================================
   STUDENTS GRID
   ============================================ */
.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

.student-card {
    background-color: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow);
    cursor: pointer;
    transition: all 0.3s ease;
}

.student-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px var(--shadow-hover);
}

.student-image {
    position: relative;
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.student-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease;
}

.student-card:hover .student-image img {
    transform: scale(1.1);
}

.student-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.8), rgba(255, 152, 0, 0.8));
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.student-card:hover .student-overlay {
    opacity: 1;
}

.student-overlay i {
    font-size: 3rem;
    color: var(--white);
}

.student-card h4 {
    padding: 1.5rem;
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

.coming-soon {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
    font-style: italic;
}

/* ============================================
   MODAL (Öğrenci Detayları)
   ============================================ */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    padding: 0;
    border-radius: 15px;
    max-width: 800px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 2rem;
    color: var(--white);
    cursor: pointer;
    z-index: 10;
    width: 40px;
    height: 40px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background-color: var(--primary-color);
    transform: rotate(90deg);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 3rem 2rem 2rem;
    text-align: center;
}

.modal-header img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--white);
    margin-bottom: 1rem;
    box-shadow: 0 5px 20px var(--shadow);
}

.modal-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.modal-body {
    padding: 2rem;
}

.experience-section {
    margin-bottom: 2rem;
}

.experience-section h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.experience-section p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 1rem;
    text-align: justify;
}

.highlights {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 1rem;
}

.highlights ul {
    list-style: none;
    padding-left: 0;
}

.highlights li {
    padding: 0.5rem 0;
    color: var(--text-dark);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.highlights li::before {
    content: '✓';
    color: var(--accent-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: var(--white);
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .nav {
        flex-direction: column;
        gap: 0.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .video-container iframe {
        height: 300px;
    }

    .students-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }

    .modal-content {
        margin: 10% 10px;
        max-height: 80vh;
    }

    .footer .container {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .students-grid {
        grid-template-columns: 1fr;
    }

    .project-header {
        padding: 1rem;
    }

    .project-info h3 {
        font-size: 1.2rem;
    }
}