/* ============================================
   Pastel Gradient Design
   Color Scheme: Lavender + Mint + Peach
   Style: Soft, dreamy, rounded shapes
   ============================================ */

:root {
    --color-lavender: #c4b5fd;
    --color-lavender-dark: #a78bfa;
    --color-mint: #a7f3d0;
    --color-mint-dark: #6ee7b7;
    --color-peach: #fcd5ce;
    --color-peach-dark: #f9a8d4;
    --color-bg: #faf5ff;
    --color-bg-card: #ffffff;
    --color-text: #4c1d95;
    --color-text-light: #7c3aed;
    --color-text-muted: #8b5cf6;
    --gradient-main: linear-gradient(135deg, var(--color-lavender) 0%, var(--color-mint) 50%, var(--color-peach) 100%);
    --gradient-text: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 50%, #f472b6 100%);
    --font-display: 'Quicksand', sans-serif;
    --font-body: 'Nunito', sans-serif;
    --radius: 24px;
    --radius-sm: 16px;
    --radius-pill: 100px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Floating Navigation */
.floating-nav {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.75rem 1rem 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-pill);
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.15);
    z-index: 1000;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-pills {
    display: flex;
    gap: 0.5rem;
}

.pill {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: all 0.3s ease;
}

.pill:hover {
    background: rgba(196, 181, 253, 0.3);
    color: var(--color-text);
}

.pill.active {
    background: var(--gradient-main);
    color: var(--color-text);
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4rem;
    padding: 8rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s ease-in-out infinite;
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: var(--color-lavender);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: var(--color-mint);
    bottom: -50px;
    right: -50px;
    animation-delay: -7s;
}

.blob-3 {
    width: 300px;
    height: 300px;
    background: var(--color-peach);
    top: 50%;
    left: 50%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 500px;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.1);
}

.hero-content h1 {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-subtitle .highlight {
    color: var(--color-text);
    font-weight: 700;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.9rem 1.75rem;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--gradient-main);
    color: var(--color-text);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    color: var(--color-text);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.1);
}

.btn-secondary:hover {
    background: white;
    transform: translateY(-2px);
}

.hero-card {
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 16px 48px rgba(139, 92, 246, 0.15);
    text-align: center;
}

.avatar-ring {
    width: 120px;
    height: 120px;
    margin: 0 auto 1.5rem;
    padding: 4px;
    border-radius: 50%;
    background: var(--gradient-main);
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.hero-card-info {
    display: grid;
    gap: 0.25rem;
}

.card-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-top: 0.75rem;
}

.card-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
}

/* Sections */
.section {
    padding: 6rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.section-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: var(--gradient-main);
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.section h2 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 3rem;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.highlight-card {
    background: white;
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    text-align: center;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.08);
    transition: transform 0.3s ease;
}

.highlight-card:hover {
    transform: translateY(-4px);
}

.highlight-icon {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 0.5rem;
}

.highlight-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    display: block;
}

.highlight-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
}

/* Research Section */
.research-section {
    background: linear-gradient(180deg, transparent 0%, rgba(196, 181, 253, 0.1) 100%);
}

.research-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.research-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.08);
    transition: all 0.3s ease;
    position: relative;
}

.research-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(139, 92, 246, 0.15);
}

.research-card.featured {
    background: var(--gradient-main);
}

.featured-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-pill);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.research-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.research-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.research-card.featured p {
    color: var(--color-text);
}

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

.tag {
    padding: 0.3rem 0.75rem;
    background: rgba(139, 92, 246, 0.1);
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-light);
}

.research-card.featured .tag {
    background: rgba(255, 255, 255, 0.5);
}

/* Publications Section */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pub-card {
    display: block;
    background: white;
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.08);
    transition: all 0.3s ease;
}

.pub-card:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.12);
}

.pub-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.pub-year {
    font-weight: 700;
    color: var(--color-lavender-dark);
}

.pub-journal {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 600;
}

.pub-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.25rem;
    line-height: 1.5;
}

.pub-authors {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.view-all-btn {
    display: inline-block;
    margin-top: 2rem;
    color: var(--color-text-light);
    text-decoration: none;
    font-weight: 700;
    transition: color 0.3s ease;
}

.view-all-btn:hover {
    color: var(--color-text);
}

/* Teaching Section */
.teaching-section {
    background: linear-gradient(180deg, rgba(167, 243, 208, 0.1) 0%, transparent 100%);
}

.teaching-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.teaching-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.08);
    transition: transform 0.3s ease;
    position: relative;
    overflow: hidden;
}

.teaching-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-main);
}

.teaching-card:hover {
    transform: translateY(-4px);
}

.course-term {
    display: inline-block;
    padding: 0.3rem 0.75rem;
    background: rgba(167, 243, 208, 0.3);
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.teaching-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.teaching-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.course-code {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-lavender-dark);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.08);
}

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(139, 92, 246, 0.1);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    font-size: 1.25rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
}

.contact-details a,
.contact-details span:not(.contact-label) {
    font-size: 1rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 600;
}

.contact-details a:hover {
    color: var(--color-text-light);
}

.social-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.social-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: white;
    border-radius: var(--radius-sm);
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.08);
    transition: all 0.3s ease;
}

.social-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.12);
}

.social-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-main);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-text);
}

.social-card span:not(.social-icon) {
    font-weight: 600;
    color: var(--color-text);
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(180deg, transparent 0%, rgba(196, 181, 253, 0.15) 100%);
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 900px) {
    .hero-section {
        flex-direction: column;
        text-align: center;
        gap: 3rem;
    }

    .hero-buttons {
        justify-content: center;
    }

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

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

@media (max-width: 700px) {
    .floating-nav {
        width: calc(100% - 2rem);
        padding: 0.5rem;
        gap: 0.5rem;
    }

    .nav-pills {
        display: none;
    }

    .section {
        padding: 4rem 1.5rem;
    }

    .hero-section {
        padding: 6rem 1.5rem 3rem;
    }

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

    .research-cards,
    .teaching-cards {
        grid-template-columns: 1fr;
    }

    .social-cards {
        grid-template-columns: 1fr;
    }
}