/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Custom Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500;600;700&family=Roboto:wght@300;400;500;700&display=swap');

/* CSS Custom Properties */
:root {
    --university-blue: #1e40af;
    --university-dark-blue: #1e3a8a;
    --fis-green: #059669;
    --cn-red: #dc2626;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #6b7280;
    --background-primary: #ffffff;
    --background-secondary: #f9fafb;
    --background-accent: #f3f4f6;
    --border-color: #d1d5db;
    --border-light: #e5e7eb;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Clearfix utility */
.clear {
    clear: both;
}

.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* Body Styling */
body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background-secondary);
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    background: var(--background-primary);
    box-shadow: var(--shadow-heavy);
    min-height: 100vh;
    animation: slideIn 0.5s ease-out;
    display: grid;
    grid-template-rows: auto auto 1fr auto;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* University Header - Using Grid */
.university-header {
    background: var(--background-primary);
    border-bottom: 3px solid var(--university-blue);
    padding: 0;
    display: grid;
    grid-template-rows: auto auto auto;
}

/* Header Row 1 - Using Grid instead of Flexbox */
.header-row-1 {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-light);
    gap: 1.5rem;
}

.photo-section {
    display: grid;
    justify-items: center;
    align-items: center;
}

.student-photo {
    width: 120px;
    height: 150px;
    border: 3px solid var(--university-blue);
    border-radius: 8px;
    overflow: hidden;
    background: var(--background-accent);
    display: grid;
    place-items: center;
    transition: all var(--transition-medium);
    position: relative;
}

.student-photo::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(30, 64, 175, 0.3) 100%);
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.student-photo:hover {
    transform: scale(1.05) rotate(2deg);
    box-shadow: var(--shadow-heavy);
}

.student-photo:hover::after {
    opacity: 1;
}

.student-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.university-info {
    text-align: center;
    padding: 0 2rem;
    display: grid;
    justify-items: center;
    align-content: center;
    gap: 0.3rem;
}

.university-info h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--university-blue);
    line-height: 1.3;
    transition: all var(--transition-medium);
    cursor: default;
}

.university-info h1:hover {
    color: var(--university-dark-blue);
    transform: scale(1.02);
}

.university-info h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--fis-green);
    transition: all var(--transition-medium);
    cursor: default;
}

.university-info h2:hover {
    transform: translateX(5px);
}

.university-info h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--cn-red);
    transition: all var(--transition-medium);
    cursor: default;
}

.university-info h3:hover {
    transform: translateX(-5px);
}

/* Logos Section - Using Grid */
.logos-section {
    display: grid;
    grid-template-columns: auto auto;
    gap: 1rem;
    align-items: center;
}

.logos-column {
    display: grid;
    grid-template-rows: auto auto;
    gap: 0.5rem;
}

.logo {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-medium);
    position: relative;
}

.logo::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.logo:hover::before {
    width: 150px;
    height: 150px;
}

.logo:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-heavy);
}

.logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.logo:hover img {
    transform: scale(1.1);
}

.tntu-logo {
    border: 2px solid var(--university-blue);
}

.fis-logo {
    border: 2px solid var(--fis-green);
}

.cn-logo {
    border: 2px solid var(--cn-red);
}

/* Header Row 2 - Personal Info */
.header-row-2 {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.05), rgba(5, 150, 105, 0.05));
    border-bottom: 1px solid var(--border-light);
    text-align: center;
    transition: background var(--transition-medium);
}

.header-row-2:hover {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.1), rgba(5, 150, 105, 0.1));
}

.personal-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    transition: all var(--transition-medium);
    cursor: default;
}

.personal-info h4:hover {
    color: var(--university-blue);
    transform: scale(1.05);
}

.personal-info h5 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--university-blue);
    margin-bottom: 0.3rem;
    transition: all var(--transition-medium);
    cursor: default;
}

.personal-info h5:hover {
    color: var(--fis-green);
}

.personal-info h5 em {
    font-style: italic;
    font-weight: 400;
}

.personal-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-medium);
    cursor: default;
}

.personal-info p:hover {
    color: var(--cn-red);
    transform: scale(1.05);
}

/* Header Row 3 - Main Menu Using Grid */
.header-row-3 {
    background: var(--university-blue);
    padding: 0;
    position: relative;
    overflow: hidden;
}

.header-row-3::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 1s ease;
}

.header-row-3:hover::before {
    left: 100%;
}

.main-menu ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    margin: 0;
    padding: 0;
}

.main-menu li {
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
}

.main-menu li:last-child {
    border-right: none;
}

.main-menu a {
    display: grid;
    place-items: center;
    padding: 1rem 1.5rem;
    color: white;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.main-menu a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: white;
    transform: translateX(-50%);
    transition: width var(--transition-medium);
}

.main-menu a:hover::before {
    width: 80%;
}

.main-menu a::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
}

.main-menu a:hover::after {
    width: 200px;
    height: 200px;
}

.main-menu a:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    letter-spacing: 1px;
}

.main-menu a.active {
    background: rgba(255, 255, 255, 0.2);
    font-weight: 600;
}

.main-menu a.active::before {
    width: 80%;
}

/* Main Content - Using Grid */
.main-content {
    padding: 2rem;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: 2rem;
}

.main-section {
    display: grid;
    grid-template-rows: auto 1fr;
    align-content: start;
    gap: 0;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
    animation: fadeInDown 0.6s ease-out;
    cursor: default;
    transition: all var(--transition-medium);
}

.page-title:hover {
    color: var(--university-blue);
    transform: scale(1.05);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--university-blue), var(--fis-green));
    border-radius: 2px;
    transition: width var(--transition-medium);
}

.page-title:hover::after {
    width: 200px;
}

/* Content Blocks Using Grid */
.content-blocks {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.content-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

/* Three column blocks */
.hobbies-row,
.ads-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.content-block {
    background: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: backwards;
}

/* Staggered animation for content blocks */
.content-row:nth-child(1) .content-block {
    animation-delay: 0.1s;
}

.content-row:nth-child(2) .content-block {
    animation-delay: 0.2s;
}

.content-row:nth-child(3) .content-block {
    animation-delay: 0.3s;
}

.content-row:nth-child(4) .content-block {
    animation-delay: 0.4s;
}

.content-row:nth-child(5) .content-block {
    animation-delay: 0.5s;
}

.content-row:nth-child(6) .content-block {
    animation-delay: 0.6s;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--university-blue);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-medium);
}

.content-block:hover::before {
    transform: scaleX(1);
}

.content-block::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.05), rgba(5, 150, 105, 0.05));
    opacity: 0;
    transition: opacity var(--transition-medium);
    pointer-events: none;
}

.content-block:hover::after {
    opacity: 1;
}

.content-block:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-heavy);
    border-color: var(--university-blue);
}

.content-block h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
    position: relative;
    z-index: 1;
    transition: all var(--transition-medium);
}

.content-block:hover h3 {
    color: var(--university-blue);
    transform: translateX(5px);
}

.content-block p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    transition: color var(--transition-medium);
}

.content-block:hover p {
    color: var(--text-primary);
}

.details-link {
    color: var(--university-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    display: inline-grid;
    grid-template-columns: auto auto;
    align-items: center;
    gap: 0.3rem;
    transition: all var(--transition-medium);
    position: relative;
    z-index: 1;
}

.details-link::after {
    content: '→';
    display: inline-block;
    transition: transform var(--transition-medium);
}

.details-link:hover {
    color: var(--university-dark-blue);
    transform: translateX(5px);
}

.details-link:hover::after {
    transform: translateX(5px);
}

/* Specific block styles */
.biography-block::before {
    background: linear-gradient(90deg, var(--university-blue), var(--fis-green));
}

.group-block::before {
    background: var(--fis-green);
}

.hobby-block::before {
    background: linear-gradient(90deg, var(--cn-red), var(--university-blue));
}

.interesting-block::before {
    background: linear-gradient(90deg, var(--university-blue), var(--cn-red));
}

/* Advertisement Blocks */
.ad-block {
    background: linear-gradient(135deg, var(--background-accent), var(--background-secondary));
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    transition: all var(--transition-medium);
    min-height: 120px;
    display: grid;
    place-content: center;
    place-items: center;
    position: relative;
    overflow: hidden;
}

.ad-block::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(30, 64, 175, 0.1), transparent);
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
    border-radius: 50%;
}

.ad-block:hover::before {
    width: 300px;
    height: 300px;
}

.ad-block:hover {
    border-color: var(--university-blue);
    border-style: solid;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.1), rgba(5, 150, 105, 0.1));
    transform: scale(1.05);
}

.ad-block h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: all var(--transition-medium);
    position: relative;
    z-index: 1;
}

.ad-block:hover h4 {
    color: var(--university-blue);
    transform: scale(1.1);
}

.ad-block p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
    transition: all var(--transition-medium);
    position: relative;
    z-index: 1;
}

.ad-block:hover p {
    color: var(--text-primary);
}

.ad-block small {
    font-size: 0.8rem;
    color: var(--text-light);
    font-style: italic;
    transition: all var(--transition-medium);
    position: relative;
    z-index: 1;
}

.ad-block:hover small {
    color: var(--text-secondary);
}

/* Sidebar Using Grid */
.sidebar {
    width: 250px;
    display: grid;
    align-content: start;
}

.sidebar-ad {
    background: linear-gradient(135deg, var(--university-blue), var(--fis-green));
    color: white;
    padding: 2rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    text-align: center;
    position: sticky;
    top: 2rem;
    transition: all var(--transition-medium);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
}

.sidebar-ad:hover {
    animation: none;
    transform: scale(1.05);
    box-shadow: var(--shadow-heavy);
}

.sidebar-ad h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-medium);
}

.sidebar-ad:hover h4 {
    transform: scale(1.1);
    letter-spacing: 1px;
}

.ad-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
}

.ad-content p {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.8rem;
    border-radius: 8px;
    margin: 0;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(5px);
    transition: all var(--transition-medium);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.ad-content p::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.ad-content p:hover::before {
    left: 100%;
}

.ad-content p:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateX(5px) scale(1.05);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 2rem;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

.footer-content {
    position: relative;
    z-index: 1;
}

.footer-content p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.9;
    transition: all var(--transition-medium);
    cursor: default;
}

.footer-content p:hover {
    opacity: 1;
    transform: scale(1.05);
}

.footer-content p:last-child {
    margin-bottom: 0;
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ============================================
   RESPONSIVE DESIGN - Media Queries
   ============================================ */

/* Tablet landscape & small desktop (max-width: 1024px) */
@media (max-width: 1024px) {
    .container {
        max-width: 100%;
    }

    .header-row-1 {
        padding: 1rem 1.5rem;
        gap: 1rem;
    }

    .university-info {
        padding: 0 1rem;
    }

    .university-info h1 {
        font-size: 1.3rem;
    }

    .university-info h2 {
        font-size: 1.1rem;
    }

    .main-menu a {
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
    }

    .content-wrapper {
        grid-template-columns: 1fr 200px;
        gap: 1.5rem;
    }

    .sidebar {
        width: 200px;
    }

    .main-content {
        padding: 1.5rem;
    }
}

/* Tablet portrait (max-width: 768px) */
@media (max-width: 768px) {
    .header-row-1 {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
        padding: 1.5rem 1rem;
        gap: 1rem;
    }

    .student-photo {
        width: 100px;
        height: 125px;
    }

    .university-info {
        padding: 0;
    }

    .university-info h1 {
        font-size: 1.2rem;
    }

    .logos-section {
        grid-template-columns: repeat(3, auto);
        justify-content: center;
    }

    .logos-column {
        display: contents;
    }

    .logo {
        width: 60px;
        height: 60px;
    }

    .main-menu ul {
        grid-template-columns: repeat(3, 1fr);
    }

    .main-menu li {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    }

    .main-menu li:nth-child(3) {
        border-right: none;
    }

    .main-menu a {
        padding: 0.7rem 0.5rem;
        font-size: 0.85rem;
    }

    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .sidebar {
        width: 100%;
    }

    .hobbies-row,
    .ads-row {
        grid-template-columns: 1fr;
    }

    .page-title {
        font-size: 1.6rem;
    }

    .main-content {
        padding: 1rem;
    }

    .header-row-2 {
        padding: 0.8rem 1rem;
    }

    .footer {
        padding: 1.5rem 1rem;
    }
}

/* Mobile (max-width: 480px) */
@media (max-width: 480px) {
    .header-row-1 {
        padding: 1rem;
        gap: 0.8rem;
    }

    .student-photo {
        width: 80px;
        height: 100px;
    }

    .university-info h1 {
        font-size: 1rem;
    }

    .university-info h2 {
        font-size: 0.95rem;
    }

    .university-info h3 {
        font-size: 0.85rem;
    }

    .logos-section {
        grid-template-columns: repeat(3, auto);
        gap: 0.5rem;
    }

    .logos-column {
        display: contents;
    }

    .logo {
        width: 50px;
        height: 50px;
    }

    .main-menu ul {
        grid-template-columns: repeat(2, 1fr);
    }

    .main-menu a {
        padding: 0.6rem 0.4rem;
        font-size: 0.8rem;
        letter-spacing: 0;
    }

    .main-menu a:hover {
        letter-spacing: 0;
    }

    .page-title {
        font-size: 1.3rem;
        margin-bottom: 1.5rem;
    }

    .content-block {
        padding: 1rem;
    }

    .content-block:hover {
        transform: translateY(-3px) scale(1.01);
    }

    .ad-block {
        min-height: 100px;
    }

    .sidebar-ad {
        padding: 1.5rem 1rem;
    }

    .personal-info h4 {
        font-size: 1rem;
    }

    .personal-info h5 {
        font-size: 0.9rem;
    }

    .footer-content p {
        font-size: 0.8rem;
    }

    .footer-content p:last-child {
        font-size: 0.75rem;
    }
}