/* ========================
   Apple macOS 26 Inspired Design
   ======================== */

:root {
    --color-bg-light: #f5f5f7;
    --color-bg-dark: #1d1d1f;
    --color-bg-accent: #f2ede7;
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-light: #f5f5f7;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
    
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-bg-dark: rgba(29, 29, 31, 0.72);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.12);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

img {
    border: none;
    outline: none;
}

a {
    outline: none;
}

button {
    outline: none;
}

body {
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background-color: var(--color-bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 113, 227, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 119, 237, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ========================
   Decorative Glass Orbs
   ======================== */

.glass-orbs {
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.glass-orb {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.1));
    backdrop-filter: saturate(200%) blur(60px);
    -webkit-backdrop-filter: saturate(200%) blur(60px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1),
                0 1px 0 0 rgba(255, 255, 255, 0.5) inset;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 400px;
    height: 400px;
    top: 10%;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    bottom: 20%;
    left: -80px;
    animation-delay: -7s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    top: 60%;
    right: 10%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

@keyframes float-subtle {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-8px);
    }
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

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

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes glow-pulse {
    0%, 100% {
        box-shadow: 0 4px 0 0 rgba(255, 255, 255, 1) inset,
                    0 2px 0 0 rgba(255, 255, 255, 0.8) inset,
                    0 24px 72px rgba(0, 113, 227, 0.25),
                    0 12px 40px rgba(0, 0, 0, 0.15),
                    0 0 60px rgba(0, 113, 227, 0.2);
    }
    50% {
        box-shadow: 0 4px 0 0 rgba(255, 255, 255, 1) inset,
                    0 2px 0 0 rgba(255, 255, 255, 0.8) inset,
                    0 28px 80px rgba(0, 113, 227, 0.3),
                    0 14px 48px rgba(0, 0, 0, 0.18),
                    0 0 80px rgba(0, 113, 227, 0.3);
    }
}

/* ========================
   Navigation Bar
   ======================== */

.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.85);
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
}

.nav-bar.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    gap: var(--spacing-md);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 0.875rem;
    background: rgba(255, 255, 255, 0.9);
    border: 1.5px solid rgba(0, 0, 0, 0.1);
    border-radius: 20px;
    color: var(--color-text-primary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.lang-toggle:hover {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(0, 113, 227, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 113, 227, 0.12),
                0 2px 8px rgba(0, 0, 0, 0.08);
}

.lang-toggle:active {
    transform: translateY(0);
}

.lang-icon {
    width: 18px;
    height: 18px;
}

.lang-text {
    line-height: 1;
}

.nav-logo {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.005em;
    white-space: nowrap;
}

@media (max-width: 640px) {
    .nav-logo {
        font-size: 0.875rem;
    }
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 400;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}


.nav-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: var(--transition-smooth);
}

/* ========================
   Hero Section
   ======================== */

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, 
        #f5f5f7 0%, 
        #f0ece5 25%,
        #ebe6de 50%, 
        #f2ede7 75%,
        #f5f5f7 100%);
    position: relative;
    padding: calc(var(--spacing-xl) + 60px) var(--spacing-lg) var(--spacing-xl);
    overflow: hidden;
}

.hero-glass-bg {
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 70%;
    height: 60%;
    background: radial-gradient(circle at center, 
        rgba(255, 255, 255, 0.6) 0%, 
        rgba(255, 255, 255, 0.3) 40%, 
        transparent 70%);
    backdrop-filter: blur(80px);
    -webkit-backdrop-filter: blur(80px);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    animation: pulse-glow 10s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.85;
        transform: translate(-50%, -50%) scale(1.08);
    }
}

.hero-content {
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

/* Hero Profile */
.hero-profile {
    margin-bottom: var(--spacing-md);
}

.hero-avatar {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 8px solid white;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15),
                0 0 0 1px rgba(0, 0, 0, 0.04);
    transition: var(--transition-smooth);
    background-color: white;
    filter: brightness(1.05) contrast(1.05);
}

.hero-avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 24px 72px rgba(0, 0, 0, 0.2),
                0 0 0 1px rgba(0, 0, 0, 0.06);
    filter: brightness(1.08) contrast(1.08);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 8vw, 5.5rem);
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
    margin: 0;
    line-height: 1.1;
}

.hero-name-en {
    font-size: 1.875rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    letter-spacing: 0.01em;
    margin: 0.5rem 0 var(--spacing-md) 0;
}

.hero-position {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease-out 0.4s forwards;
}

.position-title {
    font-weight: 500;
    color: var(--color-text-primary);
    background: linear-gradient(135deg, #1a1a1a 0%, #4a4a4a 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.position-divider {
    color: var(--color-text-secondary);
    opacity: 0.5;
}

.position-company {
    font-weight: 600;
    color: var(--color-accent);
    transition: all 0.3s ease;
    cursor: pointer;
}

.position-company:hover {
    color: var(--color-accent-hover);
    text-shadow: 0 0 20px rgba(0, 113, 227, 0.3);
}
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.position-title {
    font-weight: 500;
}

.position-divider {
    color: rgba(110, 110, 115, 0.3);
    font-weight: 300;
}

.position-company {
    color: var(--color-accent);
    font-weight: 600;
}

.hero-tagline {
    font-size: 1.125rem;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
    letter-spacing: 0.05em;
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    animation: fadeInScale 0.8s ease-out 0.6s forwards;
    background: linear-gradient(135deg, 
        rgba(0, 113, 227, 0.15) 0%,
        rgba(0, 168, 255, 0.1) 50%,
        rgba(0, 102, 204, 0.15) 100%);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    border: 1.5px solid rgba(0, 113, 227, 0.2);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.5) inset,
                0 4px 16px rgba(0, 113, 227, 0.1);
    transition: all 0.3s ease;
}

.hero-tagline:hover {
    transform: translateY(-2px);
    border-color: rgba(0, 113, 227, 0.4);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 24px rgba(0, 113, 227, 0.15),
                0 0 40px rgba(0, 113, 227, 0.1);
}

.hero-quote {
    font-size: 1.5rem;
    color: var(--color-text-dark);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-weight: 500;
    font-style: italic;
    letter-spacing: 0.12em;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease-out 0.8s forwards;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: relative;
    padding: 0 2rem;
}

.hero-quote::before,
.hero-quote::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(0, 113, 227, 0.3) 50%, 
        transparent 100%);
}

.hero-quote::before {
    left: 0;
    transform: translateY(-50%);
}

.hero-quote::after {
    right: 0;
    transform: translateY(-50%);
}
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
    font-style: italic;
    letter-spacing: 0.08em;
    opacity: 1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.hero-cta {
    margin-top: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-block;
    padding: 1.125rem 3rem;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.0625rem;
    font-weight: 600;
    transition: var(--transition-smooth);
    letter-spacing: -0.01em;
}

.cta-button.primary {
    background: var(--color-accent);
    border: none;
    box-shadow: 0 4px 20px rgba(0, 113, 227, 0.3);
    color: white;
}

.cta-button.primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 28px rgba(0, 113, 227, 0.4);
}

.cta-button.secondary {
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: saturate(180%) blur(30px);
    -webkit-backdrop-filter: saturate(180%) blur(30px);
    border: 1.5px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 4px 16px rgba(0, 0, 0, 0.08);
    color: var(--color-text-primary);
}

.cta-button.secondary:hover {
    background-color: rgba(255, 255, 255, 0.75);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    transform: translateY(-2px) scale(1.02);
    border-color: rgba(0, 0, 0, 0.12);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 6px 24px rgba(0, 0, 0, 0.12);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    padding: 0 var(--spacing-md);
}

.hero-stat {
    position: relative;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.65) 0%,
        rgba(255, 255, 255, 0.5) 100%);
    backdrop-filter: saturate(180%) blur(30px);
    -webkit-backdrop-filter: saturate(180%) blur(30px);
    border: 2px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.8) inset,
                0 1px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 0, 0, 0.08),
                0 2px 8px rgba(0, 0, 0, 0.04);
    padding: 1.75rem 2.25rem;
    border-radius: 24px;
    text-align: center;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    min-width: 220px;
    opacity: 0;
    transform: translateY(40px) scale(0.85) rotateX(10deg);
    overflow: hidden;
    cursor: pointer;
}

.hero-stat::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.3) 50%, 
        transparent 100%);
    transition: left 0.6s ease-in-out;
}

.hero-stat:hover::before {
    left: 100%;
}

.hero-stat.fade-in-visible {
    opacity: 1;
    transform: translateY(0) scale(1) rotateX(0deg);
    animation: float-subtle 5s ease-in-out infinite;
}

.hero-stat.fade-in-visible:nth-child(1) {
    animation-delay: 0s;
}

.hero-stat.fade-in-visible:nth-child(2) {
    animation-delay: 1.6s;
}

.hero-stat.fade-in-visible:nth-child(3) {
    animation-delay: 3.2s;
}

.hero-stat:hover {
    transform: translateY(-16px) scale(1.08) rotateX(0deg) !important;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.85) 0%,
        rgba(255, 255, 255, 0.7) 100%);
    backdrop-filter: saturate(220%) blur(50px);
    -webkit-backdrop-filter: saturate(220%) blur(50px);
    border-color: rgba(0, 113, 227, 0.7);
    border-width: 2.5px;
    animation: glow-pulse 2s ease-in-out infinite;
}

.hero-stat .stat-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.hero-stat:hover .stat-icon {
    transform: scale(1.2) rotate(5deg);
    filter: drop-shadow(0 4px 8px rgba(0, 113, 227, 0.3));
}

.hero-stat .stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    background: linear-gradient(135deg, #0071e3 0%, #00a8ff 50%, #0066cc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradient-shift 3s ease infinite;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
    transition: all 0.3s ease;
}

.hero-stat:hover .stat-value {
    transform: scale(1.08);
}

.hero-stat .stat-label {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    line-height: 1.4;
    transition: color 0.3s ease;
}

.hero-stat:hover .stat-label {
    color: var(--color-text-primary);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--color-text-secondary);
    border-radius: 20px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background-color: var(--color-text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s infinite;
}

@keyframes scroll {
    0%, 100% {
        opacity: 0;
        top: 8px;
    }
    50% {
        opacity: 1;
        top: 16px;
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

/* ========================
   Sections
   ======================== */

.section {
    padding: var(--spacing-xl) var(--spacing-md);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.section-light {
    background-color: var(--color-bg-light);
}

.section-dark {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
}

.section-accent {
    background-color: var(--color-bg-accent);
}

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

.content-container-narrow {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.section-header {
    text-align: center;
    margin-bottom: calc(var(--spacing-xl) + var(--spacing-md));
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

.section-dark .section-title {
    color: var(--color-text-light);
}

.title-underline {
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--color-accent), #0077ed, transparent);
    margin: 0 auto;
    border-radius: 2px;
    opacity: 0.8;
}

/* ========================
   About Section (Now Research Focus)
   ======================== */

.research-intro {
    max-width: 900px;
    margin: 0 auto calc(var(--spacing-xl) + var(--spacing-md));
    text-align: center;
}

.intro-text {
    font-size: 1.375rem;
    line-height: 1.9;
    color: var(--color-text-secondary);
    font-weight: 400;
}

.intro-text strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.research-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.research-card {
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: saturate(180%) blur(32px);
    -webkit-backdrop-filter: saturate(180%) blur(32px);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 0, 0, 0.06),
                0 1px 2px rgba(0, 0, 0, 0.03);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    transition: var(--transition-smooth);
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
}

.research-card.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

.research-card:hover {
    transform: translateY(-10px);
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 20px 60px rgba(0, 0, 0, 0.1),
                0 2px 4px rgba(0, 0, 0, 0.05);
}

.research-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.research-title {
    font-size: 1.625rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.research-desc {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.research-tag {
    display: inline-block;
    background-color: rgba(0, 113, 227, 0.08);
    backdrop-filter: saturate(150%) blur(16px);
    -webkit-backdrop-filter: saturate(150%) blur(16px);
    border: 1px solid rgba(0, 113, 227, 0.15);
    color: var(--color-accent);
    padding: 0.5rem 1.125rem;
    border-radius: 18px;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.achievements {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.achievement-item {
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: saturate(180%) blur(32px);
    -webkit-backdrop-filter: saturate(180%) blur(32px);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 0, 0, 0.06),
                0 1px 2px rgba(0, 0, 0, 0.03);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition-smooth);
    opacity: 0;
    transform: translateX(-20px);
}

.achievement-item.fade-in-visible {
    opacity: 1;
    transform: translateX(0);
}

.achievement-item:hover {
    transform: translateY(-6px);
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 16px 48px rgba(0, 0, 0, 0.1),
                0 2px 4px rgba(0, 0, 0, 0.05);
}

.achievement-icon {
    font-size: 2rem;
    min-width: 50px;
    text-align: center;
}

.achievement-text {
    flex: 1;
}

.achievement-text strong {
    display: block;
    font-size: 1.125rem;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.achievement-text span {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ========================
   Timeline (Experience)
   ======================== */

.timeline {
    position: relative;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.8) 50%, rgba(255,255,255,0.2) 100%);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-smooth);
}

.timeline-item.fade-in-visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-dot {
    position: absolute;
    left: 22px;
    top: 0;
    width: 18px;
    height: 18px;
    background-color: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 0 6px rgba(0, 113, 227, 0.2);
}

.timeline-content {
    background-color: rgba(255, 255, 255, 0.08);
    backdrop-filter: saturate(150%) blur(30px);
    -webkit-backdrop-filter: saturate(150%) blur(30px);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.1) inset,
                0 8px 32px rgba(0, 0, 0, 0.2);
    transition: var(--transition-smooth);
}

.timeline-content:hover {
    background-color: rgba(255, 255, 255, 0.12);
    backdrop-filter: saturate(180%) blur(40px);
    -webkit-backdrop-filter: saturate(180%) blur(40px);
    transform: translateX(8px);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.15) inset,
                0 12px 40px rgba(0, 0, 0, 0.25);
}

.timeline-date {
    font-size: 0.875rem;
    color: rgba(245, 245, 247, 0.7);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.timeline-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

.timeline-role {
    font-size: 1.125rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

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

.timeline-highlights li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: rgba(245, 245, 247, 0.9);
    font-size: 1rem;
}

.timeline-highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

/* ========================
   Education
   ======================== */

.education-section {
    margin-top: var(--spacing-xl);
}

.subsection-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.education-card {
    background-color: rgba(255, 255, 255, 0.08);
    backdrop-filter: saturate(150%) blur(30px);
    -webkit-backdrop-filter: saturate(150%) blur(30px);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.1) inset,
                0 8px 32px rgba(0, 0, 0, 0.2);
    transition: var(--transition-smooth);
    opacity: 0;
    transform: translateY(20px);
}

.education-card.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

.education-card:hover {
    background-color: rgba(255, 255, 255, 0.12);
    backdrop-filter: saturate(180%) blur(40px);
    -webkit-backdrop-filter: saturate(180%) blur(40px);
    transform: translateY(-4px);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.15) inset,
                0 12px 40px rgba(0, 0, 0, 0.25);
}

.education-degree {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.education-school {
    font-size: 1.125rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.education-year {
    font-size: 0.875rem;
    color: rgba(245, 245, 247, 0.7);
    margin-bottom: var(--spacing-sm);
}

.education-detail {
    color: rgba(245, 245, 247, 0.9);
    font-size: 1rem;
}

.education-detail a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition-fast);
}

.education-detail a:hover {
    border-bottom-color: var(--color-accent);
}

/* ========================
   Publications
   ======================== */

.publication-note {
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.publication-card {
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: saturate(180%) blur(32px);
    -webkit-backdrop-filter: saturate(180%) blur(32px);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 0, 0, 0.06),
                0 1px 2px rgba(0, 0, 0, 0.03);
    transition: var(--transition-smooth);
    position: relative;
    opacity: 0;
    transform: translateY(20px);
}

.publication-card.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

.publication-card:hover {
    transform: translateY(-10px);
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 20px 60px rgba(0, 0, 0, 0.1),
                0 2px 4px rgba(0, 0, 0, 0.05);
}

.publication-card.featured {
    border: 2px solid rgba(0, 113, 227, 0.5);
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.1), rgba(0, 119, 237, 0.06));
    backdrop-filter: saturate(200%) blur(36px);
    -webkit-backdrop-filter: saturate(200%) blur(36px);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 113, 227, 0.25);
}

.publication-card.featured:hover {
    border-color: rgba(0, 113, 227, 0.7);
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.15), rgba(0, 119, 237, 0.1));
    backdrop-filter: saturate(220%) blur(44px);
    -webkit-backdrop-filter: saturate(220%) blur(44px);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 20px 60px rgba(0, 113, 227, 0.35);
}

.publication-card.award {
    border: 2px solid rgba(245, 158, 11, 0.5);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(251, 191, 36, 0.05));
    backdrop-filter: saturate(200%) blur(36px);
    -webkit-backdrop-filter: saturate(200%) blur(36px);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(245, 158, 11, 0.25);
}

.publication-card.award:hover {
    border-color: rgba(245, 158, 11, 0.7);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(251, 191, 36, 0.08));
    backdrop-filter: saturate(220%) blur(44px);
    -webkit-backdrop-filter: saturate(220%) blur(44px);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 20px 60px rgba(245, 158, 11, 0.35);
}

.pub-year {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.award-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.85), rgba(251, 191, 36, 0.85));
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.4) inset,
                0 4px 12px rgba(245, 158, 11, 0.3);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pub-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.pub-venue {
    font-size: 1rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.pub-authors {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.pub-authors strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.view-more {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.view-more-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    text-decoration: none;
    font-size: 1.125rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.view-more-link:hover {
    gap: 1rem;
}

.view-more-link span {
    transition: var(--transition-smooth);
}

/* ========================
   News Section
   ======================== */

.news-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.news-card {
    background-color: var(--glass-bg);
    backdrop-filter: saturate(180%) blur(28px);
    -webkit-backdrop-filter: saturate(180%) blur(28px);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    border-left: 4px solid var(--color-accent);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.5) inset,
                0 8px 24px rgba(0, 0, 0, 0.08);
    transition: var(--transition-smooth);
    opacity: 0;
    transform: translateX(-20px);
}

.news-card.fade-in-visible {
    opacity: 1;
    transform: translateX(0);
}

.news-card:hover {
    transform: translateX(8px);
    background-color: rgba(255, 255, 255, 0.75);
    backdrop-filter: saturate(200%) blur(36px);
    -webkit-backdrop-filter: saturate(200%) blur(36px);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 12px 36px rgba(0, 0, 0, 0.12);
}

.news-date {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: block;
    letter-spacing: 0.03em;
}

.news-text {
    font-size: 1rem;
    color: var(--color-text-primary);
    line-height: 1.6;
}

.news-text strong {
    color: var(--color-accent);
    font-weight: 600;
}

/* ========================
   Projects Section
   ======================== */

.section-gradient {
    background: linear-gradient(180deg, var(--color-bg-light) 0%, #f8f8f8 100%);
    color: var(--color-text-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.project-card {
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: saturate(180%) blur(32px);
    -webkit-backdrop-filter: saturate(180%) blur(32px);
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 0, 0, 0.06);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text-primary);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    opacity: 0;
    transform: translateY(30px);
}

.project-card.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    transform: translateY(-10px);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 20px 60px rgba(0, 0, 0, 0.12);
}

.project-card.featured {
    border-color: rgba(0, 113, 227, 0.3);
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.06), rgba(255, 255, 255, 0.6));
}

.project-card.featured:hover {
    border-color: rgba(0, 113, 227, 0.5);
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 20px 60px rgba(0, 113, 227, 0.2);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.project-icon {
    font-size: 3rem;
    line-height: 1;
}

.project-stats {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.stat-badge {
    background-color: rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.project-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
    letter-spacing: -0.01em;
}

.project-role {
    font-size: 0.9375rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.project-desc {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    flex-grow: 1;
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-tags .tag {
    background-color: rgba(0, 113, 227, 0.08);
    backdrop-filter: saturate(150%) blur(16px);
    -webkit-backdrop-filter: saturate(150%) blur(16px);
    border: 1px solid rgba(0, 113, 227, 0.15);
    color: var(--color-accent);
    padding: 0.375rem 0.875rem;
    border-radius: 16px;
    font-size: 0.8125rem;
    font-weight: 500;
}

/* ========================
   Contact Section
   ======================== */

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.12);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.1) inset,
                0 2px 0 0 rgba(255, 255, 255, 0.05) inset,
                0 12px 40px rgba(0, 0, 0, 0.4),
                0 4px 12px rgba(0, 0, 0, 0.3);
    text-decoration: none;
    color: var(--color-text-light);
    transition: var(--transition-smooth);
    opacity: 0;
    transform: scale(0.9);
}

.contact-card.fade-in-visible {
    opacity: 1;
    transform: scale(1);
}

.contact-card:hover {
    background-color: rgba(255, 255, 255, 0.18);
    backdrop-filter: saturate(220%) blur(50px);
    -webkit-backdrop-filter: saturate(220%) blur(50px);
    transform: translateY(-8px) scale(1.05);
    border-color: rgba(0, 113, 227, 0.7);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.15) inset,
                0 2px 0 0 rgba(255, 255, 255, 0.08) inset,
                0 20px 60px rgba(0, 0, 0, 0.5),
                0 8px 24px rgba(0, 113, 227, 0.3);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon svg {
    width: 32px;
    height: 32px;
    color: var(--color-accent);
    transition: var(--transition-smooth);
}

.contact-card:hover .contact-icon svg {
    transform: scale(1.1);
    color: var(--color-accent-hover);
}

.contact-card span {
    font-size: 1rem;
    font-weight: 500;
}

/* ========================
   Footer
   ======================== */

.footer {
    background-color: var(--glass-bg-dark);
    backdrop-filter: saturate(150%) blur(40px);
    -webkit-backdrop-filter: saturate(150%) blur(40px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 -1px 0 0 rgba(255, 255, 255, 0.05) inset;
    color: var(--color-text-secondary);
    padding: var(--spacing-lg) var(--spacing-md);
}

/* ========================
   Back to Top Button
   ======================== */

.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.75) 0%,
        rgba(255, 255, 255, 0.6) 100%);
    backdrop-filter: saturate(180%) blur(30px);
    -webkit-backdrop-filter: saturate(180%) blur(30px);
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    color: var(--color-accent);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 0 0 rgba(255, 255, 255, 0.8) inset,
                0 1px 0 0 rgba(255, 255, 255, 0.6) inset,
                0 8px 32px rgba(0, 0, 0, 0.12),
                0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.8);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top:hover {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.9) 0%,
        rgba(255, 255, 255, 0.75) 100%);
    backdrop-filter: saturate(200%) blur(40px);
    -webkit-backdrop-filter: saturate(200%) blur(40px);
    border-color: rgba(0, 113, 227, 0.6);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 3px 0 0 rgba(255, 255, 255, 0.9) inset,
                0 2px 0 0 rgba(255, 255, 255, 0.7) inset,
                0 16px 48px rgba(0, 113, 227, 0.2),
                0 8px 24px rgba(0, 0, 0, 0.15),
                0 0 40px rgba(0, 113, 227, 0.15);
}

.back-to-top:active {
    transform: translateY(-2px) scale(1);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
}

.back-to-top:hover svg {
    transform: translateY(-3px);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    margin: 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9375rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 0.9375rem;
}

.footer-link svg {
    width: 16px;
    height: 16px;
}

.footer-link:hover {
    color: rgba(255, 255, 255, 1);
}

.footer-widget {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-sm);
}

.aoe-widget {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: saturate(180%) blur(30px);
    -webkit-backdrop-filter: saturate(180%) blur(30px);
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.08) inset,
                0 8px 24px rgba(0, 0, 0, 0.3);
}

.widget-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.widget-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.widget-label {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.widget-time {
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-divider {
    color: rgba(245, 245, 247, 0.3);
}

.footer-time {
    font-size: 0.875rem;
}

/* ========================
   Animations
   ======================== */

.fade-in {
    animation: fadeIn 1s ease-out forwards;
}

.fade-in-delay-1 {
    animation: fadeIn 1s ease-out 0.2s forwards;
    opacity: 0;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.4s forwards;
    opacity: 0;
}

.fade-in-delay-3 {
    animation: fadeIn 1s ease-out 0.6s forwards;
    opacity: 0;
}

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

/* ========================
   Responsive Design
   ======================== */

@media (max-width: 1024px) {
    .research-areas {
        grid-template-columns: 1fr;
    }

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

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

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

    .timeline::before {
        left: 15px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-dot {
        left: 7px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
        border-bottom: 1px solid rgba(0, 0, 0, 0.08);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        max-height: calc(100vh - 60px);
        overflow-y: auto;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-link {
        padding: var(--spacing-md) 0;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .lang-toggle {
        display: none;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
    }

    .back-to-top svg {
        width: 20px;
        height: 20px;
    }

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

    .nav-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .nav-logo {
        font-size: 1rem;
    }

    .hero-avatar {
        width: 100px;
        height: 100px;
    }

    .hero-name {
        font-size: clamp(2.5rem, 8vw, 4rem);
    }

    .hero-name-en {
        font-size: 1.25rem;
    }

    .hero-position {
        flex-direction: column;
        gap: 0.25rem;
    }

    .hero-tagline {
        font-size: 1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .hero-stat {
        min-width: auto;
        padding: 1.5rem 1.75rem;
    }

    .hero-stat .stat-icon {
        font-size: 2.25rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
        padding: 0 var(--spacing-md);
    }

    .cta-button {
        width: 100%;
        text-align: center;
    }

    .section {
        padding: var(--spacing-lg) var(--spacing-md);
        min-height: auto;
    }

    .research-areas {
        grid-template-columns: 1fr;
    }

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

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

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

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.5rem;
    }

    .hero-name-en {
        font-size: 1.125rem;
    }

    .hero-position {
        font-size: 1rem;
    }

    .hero-stats {
        padding: 0;
    }

    .hero-stat {
        padding: 1.25rem 1.5rem;
        min-width: 160px;
    }

    .hero-stat .stat-icon {
        font-size: 2rem;
    }

    .hero-stat .stat-value {
        font-size: 1.375rem;
    }

    .hero-stat .stat-label {
        font-size: 0.875rem;
    }

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

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

    .research-card {
        padding: var(--spacing-md);
    }

    .research-icon {
        font-size: 2.5rem;
    }

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

    .footer-links {
        justify-content: center;
    }

    .aoe-widget {
        flex-direction: column;
        text-align: center;
    }

    .widget-content {
        align-items: center;
    }
}

/* ========================
   Print Styles
   ======================== */

@media print {
    .nav-bar,
    .scroll-indicator,
    .footer {
        display: none;
    }

    .section {
        min-height: auto;
        page-break-inside: avoid;
    }
}