/* ========================================
   Variables
======================================== */
:root {
    --primary-color: #3569a8;
    --secondary-color: #3d7a8c;
    --primary-light: rgba(53, 105, 168, 0.1);
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-base: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
    --nav-height: 64px;
    --record-logo-size: 5rem;
    --text-xs: 0.75rem;
    --text-sm: 0.8125rem;
    --text-base: 0.875rem;
    --text-md: 0.9rem;
    --text-lg: 1rem;
    --text-xl: 1.05rem;
    --text-2xl: 1.125rem;
    --text-3xl: 1.25rem;
    --text-4xl: 1.375rem;
    --text-5xl: 1.5rem;
    --text-6xl: 1.625rem;
}

/* ========================================
   Reset & Base
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 1rem);
}

body {
    font-family:
        "Inter",
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        sans-serif;
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 15% 10%, rgba(53, 105, 168, 0.04) 0%, transparent 45%),
        radial-gradient(circle at 85% 90%, rgba(61, 122, 140, 0.04) 0%, transparent 45%);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    padding-top: var(--nav-height);
}

a:focus,
button:focus {
    outline: none;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ========================================
   Inline Images (global utility)
======================================== */
.inline-img {
    height: 1.35em;
    width: auto;
    vertical-align: middle;
    display: inline-block;
    margin-left: 0.2em;
    border-radius: 4px;
    transition: box-shadow 0.2s ease;
}

.inline-img:hover,
a:hover .inline-img {
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.2);
}

/* ========================================
   Top Navigation
======================================== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.top-nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-base);
}

.nav-brand:hover {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--text-3xl);
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
}

.nav-toggle .nav-toggle-close {
    display: none;
}

.nav-toggle.active .nav-toggle-open {
    display: none;
}

.nav-toggle.active .nav-toggle-close {
    display: inline-block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.nav-menu li a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--text-md);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
}

.nav-menu li a:hover {
    color: var(--primary-color);
    background: var(--bg-color);
}

.nav-menu li a.active {
    color: var(--primary-color);
    background: var(--primary-light);
}

/* ========================================
   Container & Layout
======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    align-items: stretch;
}

/* ========================================
   Sidebar - Profile Card
======================================== */
.sidebar {
    align-self: stretch;
    display: flex;
    flex-direction: column;
}

.profile-card {
    position: sticky;
    top: calc(var(--nav-height) + 1rem);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.avatar {
    width: 150px;
    height: 150px;
    margin: 0 auto 1.25rem;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid transparent;
    background:
        linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
        linear-gradient(135deg, var(--primary-color), var(--secondary-color)) border-box;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.name {
    font-size: var(--text-6xl);
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.bio {
    font-size: var(--text-md);
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.profile-header {
    display: contents;
}

/* ========================================
   Contact Links
======================================== */
.contact-links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.125rem;
    width: 100%;
    text-align: left;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.375rem 0.25rem;
    color: var(--text-secondary);
    font-size: var(--text-base);
    text-decoration: none;
    transition: var(--transition-base);
    border-radius: var(--radius-sm);
}

.contact-item i {
    width: 1.25rem;
    flex-shrink: 0;
    text-align: center;
    font-size: var(--text-md);
}

.contact-label {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

a.contact-item:hover,
a.contact-item:focus-visible {
    color: var(--primary-color);
    background: var(--primary-light);
}

.contact-item-static {
    cursor: default;
}

/* ========================================
   Main Content Area
======================================== */
.content {
    min-height: calc(100vh - var(--nav-height) - 4rem);
}

.content > .section-card:last-child {
    margin-bottom: 0;
}

/* ========================================
   Footer
======================================== */
.site-footer {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem 2.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: var(--text-base);
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-copy {
    color: var(--text-secondary);
}

.footer-meta {
    font-size: var(--text-sm);
}

/* ========================================
   Section Styling
======================================== */
.section-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    position: relative;
    font-size: var(--text-5xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.section-title-icon {
    flex-shrink: 0;
    font-size: var(--text-3xl);
    line-height: 1;
}

.section-title-text {
    flex: 1;
    min-width: 0;
}

/* ========================================
   About Section
======================================== */
.about-section p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.about-section p:last-child {
    margin-bottom: 0;
}

.about-section a {
    color: var(--primary-color);
    text-decoration: none;
}

.about-section a:hover {
    text-decoration: underline;
}

/* ========================================
   Unified Section List Items
======================================== */
.news-item,
.publications-section .publication-item,
.competition-item,
.education-item,
.experience-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.news-item:first-child,
.publications-section .publication-item:first-child,
.competition-item:first-child,
.education-item:first-child,
.experience-item:first-child {
    padding-top: 0;
}

.news-item:last-child,
.publications-section .publication-item:last-child,
.competition-item:last-child,
.education-item:last-child,
.experience-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* ========================================
   News Section
======================================== */
.news-list {
    list-style: none;
}

.news-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.news-date {
    font-weight: 700;
    font-size: var(--text-base);
    font-variant-numeric: tabular-nums;
    color: var(--primary-color);
    min-width: 5.5rem;
    flex-shrink: 0;
}

.news-content {
    color: var(--text-secondary);
}

.news-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.news-content a:hover {
    text-decoration: underline;
}

.news-list--preview .news-item:last-child {
    padding-bottom: 0.75rem;
}

.news-list--more .news-item:first-child {
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
}

.news-list--more .news-item:last-child {
    padding-bottom: 0.75rem;
}

.news-more {
    display: flex;
    flex-direction: column;
}

.news-more-toggle {
    order: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    width: 100%;
    margin-top: 0;
    padding: 0.75rem 0 0;
    background: none;
    border: none;
    font-size: var(--text-sm);
    color: var(--text-muted);
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: var(--transition-base);
}

.news-more > .news-list {
    order: 1;
}

.news-more-toggle::-webkit-details-marker {
    display: none;
}

.news-more-toggle::marker {
    content: "";
}

.news-more-icon {
    font-size: 0.75em;
    transition: transform 0.2s ease;
}

.news-more[open] .news-more-icon {
    transform: rotate(180deg);
}

.news-more-toggle:hover {
    color: var(--primary-color);
}

.news-more-toggle:focus-visible {
    color: var(--primary-color);
    outline: none;
}

.news-more-toggle:focus-visible .news-more-label {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 2px;
}

.news-more-label {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.news-more-label--expanded {
    display: none;
}

.news-more[open] .news-more-label--collapsed {
    display: none;
}

.news-more[open] .news-more-label--expanded {
    display: inline-flex;
}

.news-more[open] .news-more-toggle {
    margin-top: 0.25rem;
    padding-top: 0.75rem;
}

/* ========================================
   Publications Section
======================================== */
.publications-section .publication-item {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.publication-item .pub-image {
    flex-shrink: 0;
    width: 240px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.publication-item .pub-image img,
.publication-item .pub-image-mobile img {
    width: 100%;
    height: auto;
    display: block;
}

.publication-item .pub-image-mobile {
    display: none;
    order: 4;
    margin: 0.5rem 0;
}

.publication-item .pub-image-mobile img {
    max-width: 300px;
}

.publication-item .pub-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.publication-item .pub-title {
    order: 2;
}

.publication-item .pub-authors {
    order: 3;
}

.publication-item .pub-links {
    order: 5;
}

.pub-venue {
    display: inline;
    padding: 0.2rem 0.45rem;
    background: var(--primary-color);
    border-radius: 4px;
    font-size: var(--text-sm);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: white;

    vertical-align: 0.05em;
    line-height: 1.4;
    white-space: nowrap;
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
}

.pub-title {
    margin-bottom: 0.375rem;
    line-height: 1.5;
    font-size: var(--text-lg);
    font-weight: 700;
}

.pub-title .record-title {
    font-size: inherit;
    font-weight: inherit;
}

.pub-authors {
    font-size: var(--text-md);
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.pub-authors .author-name {
    color: var(--text-primary);
    font-weight: 700;
}

.pub-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.pub-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-base);
}

.pub-link-btn:hover,
.pub-link-btn:focus-visible {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-light);
}

.pub-link-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.section-note {
    font-size: var(--text-md);
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* ========================================
   Competitions Section
======================================== */
.competition-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

/* Shared record logo (competitions, education, experience) */
.record-logo {
    width: var(--record-logo-size);
    height: var(--record-logo-size);
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
}

.record-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 6px;
}

.competition-details {
    flex: 1;
    min-width: 0;
}

.competition-details .record-title {
    display: block;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.competition-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.site-badge {
    display: inline-block;
    padding: 0.15em 0.55em;
    border-radius: 4px;
    font-size: 0.85em;
    line-height: 1.5;
    white-space: nowrap;
    vertical-align: middle;
    font-weight: 700;
}

.site-badge--rank {
    color: #224b8d;
    background-color: #e8eef5;
    border: 1px solid #b7c5db;
}

.site-badge--bonus {
    color: #236745;
    background-color: #e9f5ef;
    border: 1px solid #b0d0c0;
}

.site-badge--gold {
    color: #745811;
    background-color: #faf3dc;
    border: 1px solid #d3c396;
}

.site-badge--silver {
    color: #5a6578;
    background-color: #eef1f5;
    border: 1px solid #bac0c9;
}

.site-badge--bronze {
    color: #7a5530;
    background-color: #f3ebe3;
    border: 1px solid #c9b7a4;
}

.site-badge--merit {
    color: #4f447c;
    background-color: #edeaf5;
    border: 1px solid #c1bbd6;
}

.site-badge--date {
    color: #3d4a5c;
    background-color: #f0f2f4;
    border: 1px solid #d5dadf;
}

/* ========================================
   Education & Experience
======================================== */
.education-item,
.experience-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.edu-details,
.exp-details {
    flex: 1;
    min-width: 0;
}

.edu-details p,
.exp-details p {
    margin: 0;
    line-height: 1.5;
}

.record-header {
    margin-bottom: 0.125rem;
}

.record-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
}

a.record-title {
    color: var(--primary-color);
    text-decoration: none;
}

a.record-title:hover {
    text-decoration: underline;
}

.record-subtitle {
    color: var(--text-secondary);
}

.record-meta {
    font-size: var(--text-base);
    color: var(--text-muted);
}

/* ========================================
   Responsive Styles
======================================== */

/* Tablet: 768px - 1024px */
@media (max-width: 1024px) {
    .container {
        grid-template-columns: 280px 1fr;
        gap: 1.5rem;
        padding: 1.5rem;
    }

    .sidebar {
        align-self: auto;
    }

    .profile-card {
        top: calc(var(--nav-height) + 1.5rem);
        padding: 1.5rem;
    }

    .avatar {
        width: 120px;
        height: 120px;
    }

    .name {
        font-size: var(--text-4xl);
    }

    .section-card {
        padding: 1.5rem;
    }

    .section-title {
        font-size: var(--text-3xl);
    }

    .nav-container {
        padding: 0 1.5rem;
    }

    .nav-menu li a {
        padding: 0.375rem 0.75rem;
        font-size: var(--text-sm);
    }
}

/* Mobile: below 768px */
@media (max-width: 768px) {
    :root {
        --nav-height: 56px;
        --record-logo-size: 4.5rem;
    }

    body {
        padding-top: var(--nav-height);
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-menu {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 0.5rem;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li a {
        padding: 0.75rem 1rem;
        border-radius: var(--radius-sm);
    }

    .nav-menu li a:hover {
        background: var(--bg-color);
    }

    .container {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }

    .sidebar {
        position: relative;
        top: 0;
        order: -1;
        align-self: auto;
    }

    .profile-card {
        position: static;
        padding: 1.25rem;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        text-align: left;
    }

    .profile-header {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 1rem;
        margin-bottom: 1rem;
    }

    .profile-card .avatar {
        width: 72px;
        height: 72px;
        margin: 0;
        flex-shrink: 0;
    }

    .profile-card .profile-info {
        flex: 1;
        min-width: 0;
        text-align: left;
    }

    .profile-card .name {
        font-size: var(--text-2xl);
        margin: 0;
    }

    .profile-card .bio {
        font-size: var(--text-base);
        margin: 0;
        min-width: 0;
    }

    .profile-card .contact-links {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: flex-start;
        gap: 0.5rem;
    }

    .profile-card .contact-item-static {
        display: none;
    }

    .profile-card .contact-label {
        display: none;
    }

    .profile-card a.contact-item {
        width: 36px;
        height: 36px;
        padding: 0;
        justify-content: center;
        border-radius: 50%;
        background: var(--bg-color);
        font-size: var(--text-lg);
    }

    .profile-card a.contact-item i {
        width: auto;
    }

    .profile-card a.contact-item:hover,
    .profile-card a.contact-item:focus-visible {
        background: var(--primary-color);
        color: white;
    }

    .content {
        min-height: auto;
    }

    .section-card {
        padding: 1.25rem;
        margin-bottom: 1rem;
    }

    .section-title {
        font-size: var(--text-2xl);
        padding-bottom: 0.5rem;
        margin-bottom: 1rem;
    }

    .section-title-icon {
        font-size: var(--text-2xl);
    }

    .publications-section .publication-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .publication-item .pub-image {
        display: none;
    }

    .publication-item .pub-image-mobile {
        display: block;
        width: 100%;
        max-width: 300px;
        order: 5;
        margin: 0.5rem 0;
    }

    .publication-item .pub-image-mobile img {
        width: 100%;
    }

    .publication-item .pub-info {
        order: 1;
    }

    .publication-item .pub-title {
        order: 2;
    }

    .publication-item .pub-authors {
        order: 3;
    }

    .publication-item .pub-links {
        order: 6;
    }

    .record-title {
        font-size: var(--text-lg);
    }

    .record-subtitle {
        font-size: var(--text-md);
    }

    .record-meta {
        font-size: var(--text-sm);
    }

    .news-item,
    .publications-section .publication-item,
    .education-item,
    .experience-item,
    .competition-item {
        padding: 0.625rem 0;
    }

    .news-item:first-child,
    .publications-section .publication-item:first-child,
    .education-item:first-child,
    .experience-item:first-child,
    .competition-item:first-child {
        padding-top: 0;
    }

    .news-item:last-child,
    .publications-section .publication-item:last-child,
    .education-item:last-child,
    .experience-item:last-child,
    .competition-item:last-child {
        padding-bottom: 0;
    }

    .news-item {
        flex-direction: column;
        gap: 0.25rem;
    }

    .news-date {
        min-width: auto;
    }

    .pub-authors {
        font-size: var(--text-sm);
    }

    .pub-link-btn {
        padding: 0.25rem 0.5rem;
        font-size: var(--text-xs);
    }

    .section-note {
        font-size: var(--text-xs);
    }

    .site-footer {
        padding: 1rem 1rem 2rem;
    }
}

/* ========================================
   Animations
======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content > .section-card:nth-child(-n + 2) {
    animation: fadeInUp 0.3s ease both;
}

.content > .section-card:nth-child(1) {
    animation-delay: 0s;
}

.content > .section-card:nth-child(2) {
    animation-delay: 0.04s;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .content > .section-card:nth-child(-n + 2) {
        animation: none;
    }
}

/* ========================================
   Print Styles
======================================== */
@media print {
    .top-nav,
    .site-footer {
        display: none;
    }

    body {
        padding-top: 0;
        background-image: none;
    }

    .container {
        display: block;
    }

    .sidebar {
        position: relative;
    }

    .profile-card {
        position: static;
    }

    .section-card {
        break-inside: avoid;
    }
}