:root {
    --bg-color: #f4f6f8;
    --bg-canvas: #f4f6f8;
    --bg-card: rgba(255, 255, 255, 0.45);
    --bg-card-contrast: rgba(255, 255, 255, 0.25);
    --glass-bg: rgba(255, 255, 255, 0.55);
    
    --text-color: #111111;
    --text-muted: #5e6675;
    
    --border-color: rgba(17, 17, 17, 0.08);
    --border-hover: #111111;
    
    --primary-color: #111111;
    --secondary-color: #3b82f6;
    --shadow-color: rgba(17, 17, 17, 0.03);
    
    --dock-bg: rgba(244, 246, 248, 0.95);
    --dock-border: rgba(17, 17, 17, 0.05);
    --blob-color: rgba(59, 130, 246, 0.03);
    
    --font-heading: 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    --transition-elegant: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);

    --metric-orange-bg: rgba(249, 115, 22, 0.04);
    --metric-orange-border: rgba(249, 115, 22, 0.15);
    --metric-orange-text: #ea580c;

    --metric-blue-bg: rgba(59, 130, 246, 0.04);
    --metric-blue-border: rgba(59, 130, 246, 0.15);
    --metric-blue-text: #2563eb;

    --metric-green-bg: rgba(16, 185, 129, 0.04);
    --metric-green-border: rgba(16, 185, 129, 0.15);
    --metric-green-text: #059669;

    --metric-purple-bg: rgba(139, 92, 246, 0.04);
    --metric-purple-border: rgba(139, 92, 246, 0.15);
    --metric-purple-text: #7c3aed;

    --header-btn-bg: rgba(244, 246, 248, 0.9);
}

[data-theme="dark"] {
    --bg-color: #090a0c;
    --bg-canvas: #090a0c;
    --bg-card: rgba(15, 17, 20, 0.55);
    --bg-card-contrast: rgba(255, 255, 255, 0.03);
    --glass-bg: rgba(15, 17, 20, 0.65);
    
    --text-color: #ffffff;
    --text-muted: #94a3b8;
    
    --border-color: rgba(255, 255, 255, 0.07);
    --border-hover: #ffffff;
    
    --primary-color: #ffffff;
    --secondary-color: #f97316;
    --shadow-color: rgba(0, 0, 0, 0.2);
    
    --dock-bg: rgba(9, 10, 12, 0.95);
    --dock-border: rgba(255, 255, 255, 0.03);
    --blob-color: rgba(249, 115, 22, 0.02);

    --metric-orange-bg: rgba(249, 115, 22, 0.08);
    --metric-orange-border: rgba(249, 115, 22, 0.25);
    --metric-orange-text: #fb923c;

    --metric-blue-bg: rgba(59, 130, 246, 0.08);
    --metric-blue-border: rgba(59, 130, 246, 0.25);
    --metric-blue-text: #60a5fa;

    --metric-green-bg: rgba(16, 185, 129, 0.08);
    --metric-green-border: rgba(16, 185, 129, 0.25);
    --metric-green-text: #34d399;

    --metric-purple-bg: rgba(139, 92, 246, 0.08);
    --metric-purple-border: rgba(139, 92, 246, 0.25);
    --metric-purple-text: #a78bfa;

    --header-btn-bg: rgba(9, 10, 12, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    background-image: var(--bg-canvas);
    background-attachment: fixed;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    padding-top: 130px;
    transition: background-color 0.5s ease, color 0.5s ease;
    -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--border-radius-md);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-color);
}

.floating-blobs-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}

.floating-blob {
    position: absolute;
    width: 32px;
    height: 32px;
    background-color: var(--blob-color);
    border-radius: var(--border-radius-md);
    transform: rotate(15deg);
    transition: background-color 0.5s ease;
}

.blob-1 { top: 12%; left: 42%; width: 45px; height: 45px; animation: blob-drift-1 12s infinite ease-in-out; }
.blob-2 { top: 25%; left: 10%; width: 25px; height: 25px; transform: rotate(-10deg); animation: blob-drift-2 15s infinite ease-in-out; }
.blob-3 { top: 35%; left: 85%; width: 55px; height: 55px; transform: rotate(20deg); animation: blob-drift-1 18s infinite ease-in-out; }
.blob-4 { top: 58%; left: 12%; width: 65px; height: 65px; transform: rotate(-25deg); animation: blob-drift-2 20s infinite ease-in-out; }
.blob-5 { top: 68%; left: 75%; width: 35px; height: 35px; transform: rotate(15deg); animation: blob-drift-1 14s infinite ease-in-out; }

@keyframes blob-drift-1 {
    0% { transform: translate(0, 0) rotate(15deg); }
    50% { transform: translate(15px, -20px) rotate(35deg); }
    100% { transform: translate(0, 0) rotate(15deg); }
}

@keyframes blob-drift-2 {
    0% { transform: translate(0, 0) rotate(-25deg); }
    50% { transform: translate(-20px, 15px) rotate(-5deg); }
    100% { transform: translate(0, 0) rotate(-25deg); }
}

.header-nav {
    position: fixed;
    top: 25px;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 0 40px;
}

.nav-flex {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.avatar-container {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--header-btn-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px var(--shadow-color);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-elegant);
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.avatar-container:hover {
    transform: scale(1.05);
}

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

.switch-toggle-container {
    background: var(--header-btn-bg);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 5px;
    display: flex;
    align-items: center;
    position: relative;
    box-shadow: 0 8px 25px var(--shadow-color);
    width: 200px;
    height: 50px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.switch-toggle-container.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-5px);
}

.switch-active-indicator {
    position: absolute;
    top: 4px;
    left: 4px;
    width: 94px;
    height: 40px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px var(--shadow-color);
    border-radius: 35px;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1;
}

.switch-toggle-container.research-active .switch-active-indicator {
    transform: translateX(96px);
}

.switch-tab-btn {
    position: relative;
    z-index: 2;
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    text-align: center;
    height: 100%;
    transition: var(--transition-elegant);
}

.switch-tab-btn.active {
    color: var(--text-color);
}

.menu-toggle-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--header-btn-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px var(--shadow-color);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition-elegant);
    color: var(--text-color);
    outline: none;
}

.theme-toggle:hover {
    transform: scale(1.05);
}

.menu-toggle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--header-btn-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px var(--shadow-color);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition-elegant);
    color: var(--text-color);
    outline: none;
}

.menu-toggle:hover {
    transform: scale(1.05);
}

.menu-toggle i {
    font-size: 1.15rem;
}

.dropdown-menu-overlay {
    position: absolute;
    top: 65px;
    right: 0;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 12px;
    width: 200px;
    box-shadow: 0 15px 35px var(--shadow-color);
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
    pointer-events: none;
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 999;
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
}

.dropdown-menu-overlay.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.dropdown-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    list-style: none;
}

.dropdown-item-btn {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    padding: 12px 16px;
    border-radius: var(--border-radius-md);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    transition: var(--transition-elegant);
}

.dropdown-item-btn:hover {
    background: var(--bg-card);
}

.dropdown-item-btn.active {
    background: var(--bg-card);
    color: var(--text-color);
}

.dropdown-item-btn i {
    font-size: 1.05rem;
    color: var(--text-muted);
    width: 20px;
    text-align: center;
}

.dropdown-socials-box {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.dropdown-socials-box a {
    color: var(--text-color);
    font-size: 1.1rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-card-contrast);
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-elegant);
    text-decoration: none;
}

.dropdown-socials-box a:hover {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
    transform: translateY(-2px);
}

.scroll-to-top {
    position: fixed;
    bottom: 40px;
    left: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--header-btn-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 25px var(--shadow-color);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition-elegant);
    color: var(--text-color);
    outline: none;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transform: translateY(15px);
}

.scroll-to-top:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 12px 30px var(--shadow-color);
}

.scroll-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.page-wrapper {
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.page-wrapper.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.main-wrapper {
    max-width: 850px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

.hero-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 50px 0 30px;
}

.hero-title {
    font-size: clamp(3.2rem, 7.5vw, 4.8rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-color);
    line-height: 1.08;
}

.location-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: -0.2px;
}

.hero-desc {
    text-align: center;
    max-width: 620px;
    font-size: 1.15rem;
    line-height: 1.65;
    color: var(--text-muted);
    margin-top: 25px;
}

.glass-datacard {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 24px;
    margin-top: 40px;
    width: 100%;
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    transition: var(--transition-elegant);
}

.datacard-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.datacard-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px 16px;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px var(--shadow-color);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    transition: var(--transition-elegant);
}

.datacard-col:hover {
    transform: translateY(-2px);
}

.metric-orange {
    background: var(--metric-orange-bg);
    border-color: var(--metric-orange-border);
}
.metric-orange:hover {
    border-color: var(--metric-orange-text);
}
.metric-orange .datacard-value {
    color: var(--metric-orange-text);
}

.metric-blue {
    background: var(--metric-blue-bg);
    border-color: var(--metric-blue-border);
}
.metric-blue:hover {
    border-color: var(--metric-blue-text);
}
.metric-blue .datacard-value {
    color: var(--metric-blue-text);
}

.metric-green {
    background: var(--metric-green-bg);
    border-color: var(--metric-green-border);
}
.metric-green:hover {
    border-color: var(--metric-green-text);
}
.metric-green .datacard-value {
    color: var(--metric-green-text);
}

.metric-purple {
    background: var(--metric-purple-bg);
    border-color: var(--metric-purple-border);
}
.metric-purple:hover {
    border-color: var(--metric-purple-text);
}
.metric-purple .datacard-value {
    color: var(--metric-purple-text);
}

.datacard-label {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-top: 8px;
}

.datacard-value {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1;
    font-family: var(--font-heading);
    letter-spacing: -0.02em;
}

.research-datacard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.paper-featured-card {
    border-radius: var(--border-radius-md);
    padding: 25px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px var(--shadow-color);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    display: flex;
    flex-direction: column;
    transition: var(--transition-elegant);
}

.paper-featured-card:hover {
    transform: translateY(-2px);
}

.paper-ieee {
    background: var(--metric-blue-bg);
    border-color: var(--metric-blue-border);
}
.paper-ieee:hover {
    border-color: var(--metric-blue-text);
}

.paper-acm {
    background: var(--metric-purple-bg);
    border-color: var(--metric-purple-border);
}
.paper-acm:hover {
    border-color: var(--metric-purple-text);
}

.paper-tag {
    font-size: 0.68rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
    align-self: flex-start;
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--bg-card-contrast);
    border: 1px solid var(--border-color);
}

.paper-ieee .paper-tag {
    color: var(--metric-blue-text);
}
.paper-acm .paper-tag {
    color: var(--metric-purple-text);
}

.paper-featured-card h3 {
    font-size: 1.1rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
    color: var(--text-color);
}

.paper-featured-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.5;
    flex-grow: 1;
    margin-bottom: 20px;
}

.paper-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.76rem;
    font-weight: 700;
}

.paper-doi-link {
    text-decoration: none;
    color: var(--text-muted);
    transition: var(--transition-elegant);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.paper-doi-link:hover {
    color: var(--text-color);
}

.paper-year {
    color: var(--text-muted);
}

.research-stats-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 10px;
}

.research-stat-capsule {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px var(--shadow-color);
    background: var(--bg-card);
    transition: var(--transition-elegant);
}

.research-stat-capsule:hover {
    transform: translateY(-2px);
}

.research-stat-capsule i {
    font-size: 1.05rem;
    color: var(--text-muted);
    width: 20px;
    text-align: center;
}

.citation-stat {
    background: var(--metric-orange-bg);
    border-color: var(--metric-orange-border);
}
.citation-stat i, .citation-stat .stat-num {
    color: var(--metric-orange-text);
}

.ielts-stat {
    background: var(--metric-green-bg);
    border-color: var(--metric-green-border);
}
.ielts-stat i, .ielts-stat .stat-num {
    color: var(--metric-green-text);
}

.indexing-stat {
    background: var(--metric-blue-bg);
    border-color: var(--metric-blue-border);
}
.indexing-stat i, .indexing-stat .stat-num {
    color: var(--metric-blue-text);
}

.stat-num {
    font-size: 1.15rem;
    font-weight: 800;
    line-height: 1;
}

.stat-lbl {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.mode-content-panel {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.mode-content-panel.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.section-header-pill {
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin: 60px 0 25px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.horizontal-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 8px 24px var(--shadow-color);
    padding: 35px;
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    transition: var(--transition-elegant);
}

.glass-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 15px 35px var(--shadow-color);
}

.work-row-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 25px;
}

.row-item-left {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.row-item-left h3 {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.row-item-left .item-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 700;
}

.row-item-right h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.availability-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 10px;
    background: var(--metric-green-bg);
    border: 1px solid var(--metric-green-border);
    color: var(--metric-green-text);
    border-radius: 20px;
}

.status-dot {
    width: 6px;
    height: 6px;
    background-color: var(--metric-green-text);
    border-radius: 50%;
    animation: status-pulse 2s infinite;
}

@keyframes status-pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { transform: scale(1); box-shadow: 0 0 0 5px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.custom-list {
    list-style: none;
}

.custom-list li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 10px;
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.custom-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

.row-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.row-tags span {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 12px;
    background: var(--bg-card-contrast);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    border-radius: 30px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.row-domains {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skills-glass-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.skills-glass-grid .glass-card.full-width {
    grid-column: span 2;
}

.skills-glass-card h3 {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.2px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.skills-glass-card h3 i {
    color: var(--secondary-color);
    margin-right: 8px;
    font-size: 1.05rem;
}

.skill-tags-flex {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags-flex span {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-color);
}

.skill-tags-flex span::after {
    content: '•';
    margin-left: 8px;
    color: var(--text-muted);
}

.skill-tags-flex span:last-child::after {
    content: '';
}

.skill-description-text {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.academic-row-item {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 20px;
}

.academic-row-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.academic-left h4 {
    font-size: 1.15rem;
    font-weight: 800;
}

.academic-left p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.academic-right {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--bg-card-contrast);
    border: 1px solid var(--border-color);
    padding: 4px 12px;
    border-radius: 12px;
}

.cert-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.cert-header h3 {
    font-size: 1.1rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.2px;
}

.cert-issuer {
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-top: 2px;
}

.cert-icon-lang {
    font-size: 1.4rem;
    color: var(--metric-green-text);
}

.cert-icon-ai {
    font-size: 1.4rem;
    color: var(--metric-purple-text);
}

.cert-body {
    margin-bottom: 20px;
}

.cert-score-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 10px;
    background: var(--metric-green-bg);
    border: 1px solid var(--metric-green-border);
    color: var(--metric-green-text);
    border-radius: 20px;
    margin-bottom: 8px;
}

.cert-id-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 10px;
    background: var(--metric-purple-bg);
    border: 1px solid var(--metric-purple-border);
    color: var(--metric-purple-text);
    border-radius: 20px;
    margin-bottom: 8px;
}

.cert-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.cert-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.cert-date {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
}

.cert-verify-btn {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    padding: 6px 16px;
    border-radius: 30px;
    background: var(--bg-card-contrast);
    border: 1px solid var(--border-color);
    transition: var(--transition-elegant);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.cert-verify-btn:hover {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}

.github-verify-btn {
    border-color: var(--metric-blue-text);
    color: var(--metric-blue-text);
}

.github-verify-btn:hover {
    background: var(--metric-blue-text);
    color: var(--bg-color) !important;
    border-color: var(--metric-blue-text);
}

.credly-verify-btn {
    border-color: var(--metric-orange-text);
    color: var(--metric-orange-text);
}

.credly-verify-btn:hover {
    background: var(--metric-orange-text);
    color: var(--bg-color) !important;
    border-color: var(--metric-orange-text);
}

.about-gallery-container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    height: 380px;
    margin-bottom: 50px;
    width: 100%;
}

.gallery-photo-card {
    position: absolute;
    width: 250px;
    height: 340px;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 40px var(--shadow-color);
    transition: var(--transition-elegant);
}

.gallery-photo-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.photo-card-left {
    transform: translateX(-160px) rotate(-8deg) scale(0.85);
    z-index: 1;
}

.photo-card-right {
    transform: translateX(160px) rotate(8deg) scale(0.85);
    z-index: 1;
}

.photo-card-center {
    z-index: 10;
    transform: scale(1);
    width: 260px;
    height: 360px;
}

.about-title {
    font-size: clamp(2.4rem, 6vw, 3.8rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 25px;
    line-height: 1.15;
}

.about-title .gradient-name {
    color: #f97316;
    background: linear-gradient(135deg, #f97316 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.about-desc {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.about-desc p {
    margin-bottom: 18px;
}

.contact-section {
    text-align: center;
    padding: 60px 0 20px;
}

.contact-section p {
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.6;
    color: var(--text-muted);
    max-width: 500px;
    margin: 0 auto 35px;
}

.contact-flex {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.contact-pill-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 12px 28px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 700;
    transition: var(--transition-elegant);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.contact-pill-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.site-credits {
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 700;
    margin-top: 80px;
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
}

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    body {
        padding-top: 100px;
    }
    
    .header-nav {
        padding: 0 15px;
    }
    
    .avatar-container,
    .theme-toggle,
    .menu-toggle {
        width: 42px;
        height: 42px;
        background: var(--bg-color) !important;
        border-color: var(--text-color) !important;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12) !important;
    }
    
    .switch-toggle-container {
        width: 155px;
        height: 42px;
        padding: 3px;
        background: var(--bg-color) !important;
        border-color: var(--text-color) !important;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12) !important;
    }
    
    .switch-active-indicator {
        width: 72px;
        height: 34px;
        left: 3px;
    }
    
    .switch-toggle-container.research-active .switch-active-indicator {
        transform: translateX(76px);
    }
    
    .switch-tab-btn {
        font-size: 0.78rem;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .glass-datacard {
        padding: 16px;
    }
    
    .datacard-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .datacard-col {
        padding: 16px 8px;
    }

    .datacard-value {
        font-size: 1.8rem;
    }

    .research-datacard-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .research-stats-strip {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .work-row-item {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .skills-glass-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-glass-grid .glass-card.full-width {
        grid-column: span 1;
    }
    
    .academic-row-item {
        grid-template-columns: 1fr;
        gap: 10px;
        align-items: flex-start;
    }
    
    .academic-right {
        align-self: flex-start;
    }
    
    .about-gallery-container {
        height: 280px;
    }
    
    .gallery-photo-card {
        width: 150px;
        height: 210px;
    }
    
    .photo-card-left {
        transform: translateX(-80px) rotate(-6deg) scale(0.85);
    }
    
    .photo-card-right {
        transform: translateX(80px) rotate(6deg) scale(0.85);
    }
    
    .photo-card-center {
        width: 160px;
        height: 220px;
    }

    .dropdown-menu-overlay {
        width: 200px;
        top: 55px;
    }

    .scroll-to-top {
        width: 42px;
        height: 42px;
        bottom: 30px;
        left: 15px;
        background: var(--bg-color) !important;
        border-color: var(--text-color) !important;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12) !important;
    }
}

@media (max-width: 480px) {
    .header-nav {
        padding: 0 10px;
        top: 15px;
    }
    
    .avatar-container,
    .theme-toggle,
    .menu-toggle {
        width: 38px;
        height: 38px;
    }
    
    .switch-toggle-container {
        width: 135px;
        height: 38px;
        padding: 3px;
    }
    
    .switch-active-indicator {
        width: 62px;
        height: 30px;
    }
    
    .switch-toggle-container.research-active .switch-active-indicator {
        transform: translateX(66px);
    }
    
    .switch-tab-btn {
        font-size: 0.74rem;
    }
    
    .menu-toggle-container {
        gap: 6px;
    }
    
    .dropdown-menu-overlay {
        width: 180px;
        top: 50px;
    }

    .scroll-to-top {
        width: 38px;
        height: 38px;
        bottom: 20px;
        left: 10px;
    }
}

@media (hover: hover) and (pointer: fine) and (min-width: 1025px) {
    body.has-custom-cursor {
        cursor: none;
    }
    body.has-custom-cursor a,
    body.has-custom-cursor button,
    body.has-custom-cursor [role="button"],
    body.has-custom-cursor .switch-tab-btn,
    body.has-custom-cursor .dropdown-item-btn,
    body.has-custom-cursor .avatar-container,
    body.has-custom-cursor .theme-toggle,
    body.has-custom-cursor .menu-toggle,
    body.has-custom-cursor .contact-pill-btn,
    body.has-custom-cursor .cert-verify-btn,
    body.has-custom-cursor .datacard-col,
    body.has-custom-cursor .paper-featured-card,
    body.has-custom-cursor .scroll-to-top {
        cursor: none;
    }
}

@media (max-width: 1024px) {
    .custom-cursor-dot,
    .custom-cursor-outline {
        display: none !important;
    }
}

.custom-cursor-dot,
.custom-cursor-outline {
    position: fixed;
    top: 0;
    left: 0;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 99999;
    opacity: 0;
    transition: opacity 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.custom-cursor-dot {
    width: 6px;
    height: 6px;
    background-color: var(--metric-blue-text);
}

.custom-cursor-dot.inverted {
    background-color: #ffffff !important;
    mix-blend-mode: difference;
}

.custom-cursor-outline {
    width: 22px;
    height: 22px;
    background-color: transparent;
    border: 1px solid var(--metric-blue-text);
}

.cursor-ripple {
    position: fixed;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 99998;
    width: 10px;
    height: 10px;
    background-color: transparent;
    border: 2px solid var(--metric-blue-text);
    opacity: 0.8;
    animation: cursor-ripple-anim 0.5s cubic-bezier(0.1, 0.8, 0.3, 1) forwards;
}

@keyframes cursor-ripple-anim {
    to {
        width: 60px;
        height: 60px;
        opacity: 0;
    }
}