@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Common variables */
    --font-main: 'Inter', sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    /* Light Mode (Bento Grid Style) */
    --bg-color: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --card-border: 1px solid rgba(0, 0, 0, 0.05);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --card-hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --accent-color: #e0e7ff;
    --accent-text: #4f46e5;
    --nav-bg: rgba(255, 255, 255, 0.8);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: 1px solid rgba(255, 255, 255, 0.5);
    --bg-gradient: radial-gradient(circle at 15% 50%, rgba(224, 231, 255, 0.5), transparent 40%),
        radial-gradient(circle at 85% 30%, rgba(219, 234, 254, 0.5), transparent 40%);
}

[data-theme="dark"] {
    /* Dark Mode (Premium Glassmorphism) */
    --bg-color: #0b0f19;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --card-bg: rgba(30, 41, 59, 0.4);
    --card-border: 1px solid rgba(255, 255, 255, 0.08);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --card-hover-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
    --primary-color: #60a5fa;
    --primary-hover: #93c5fd;
    --accent-color: rgba(96, 165, 250, 0.15);
    --accent-text: #93c5fd;
    --nav-bg: rgba(11, 15, 25, 0.8);
    --glass-bg: rgba(15, 23, 42, 0.6);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --bg-gradient: radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.15), transparent 30%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.15), transparent 30%),
        radial-gradient(circle at 50% 50%, rgba(15, 23, 42, 1) 0%, rgba(2, 6, 23, 1) 100%);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    transition: var(--transition);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
}

/* Layout */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
}

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

/* Glass & Card Styling */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.bento-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.bento-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: var(--card-border);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    font-weight: 600;
    color: var(--text-main);
    opacity: 0.8;
}

.nav-link:hover {
    opacity: 1;
}

.theme-toggle {
    background: var(--accent-color);
    color: var(--accent-text);
    border: none;
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 6rem;
    height: max-content;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.profile-pic {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    margin: 0 auto 1.5rem auto;
    display: block;
    border: 4px solid var(--accent-color);
}

.profile-info {
    text-align: center;
}

.profile-name {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.profile-title {
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.profile-org {
    font-size: 0.95rem;
    color: var(--text-muted);
    opacity: 0.9;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--card-bg);
    border: var(--card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    font-size: 1.25rem;
    transition: var(--transition);
}

.social-icon:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 1rem;
    width: 100%;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
}

.btn-primary:hover {
    background: var(--primary-hover);
    color: white;
}

.btn-sub {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
}

.btn-sub:hover {
    background: var(--accent-color);
}

/* Bento Grid */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .bento-grid {
        grid-template-columns: 1fr;
    }
}

.bento-wide {
    grid-column: 1 / -1;
}

.section-title {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Timelines / Experience */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.timeline-item {
    position: relative;
    padding-left: 1.25rem;
    border-left: 2px solid var(--accent-color);
    transition: var(--transition);
}

.timeline-item.past {
    opacity: 0.6;
    border-left-color: var(--card-border);
}

.timeline-item.past:hover {
    opacity: 0.9;
}

.timeline-dot {
    position: absolute;
    left: -6px;
    top: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 0 0 4px var(--bg-color);
    transition: var(--transition);
}

.timeline-item.past .timeline-dot {
    background: var(--text-muted);
}

.tl-title {
    font-weight: 700;
    font-size: 1.1rem;
    line-height: 1.3;
}

.tl-org {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.1rem;
}

.tl-desc {
    font-size: 0.95rem;
    margin-top: 0.2rem;
    margin-bottom: 0;
    line-height: 1.4;
}

.tl-date {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-top: 0.15rem;
    transition: var(--transition);
}

.timeline-item.past .tl-date {
    color: var(--text-muted);
}

/* Badges */
.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.badge {
    background: var(--accent-color);
    color: var(--accent-text);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-secondary {
    background: var(--card-bg);
    border: var(--card-border);
    color: var(--text-muted);
}

/* Publication Item */
.pub-item {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding: 1rem;
    border: var(--card-border);
    border-radius: var(--radius-md);
    background: rgba(128, 128, 128, 0.03);
    transition: var(--transition);
}

.pub-item:hover {
    background: var(--card-bg);
    transform: translateX(4px);
    box-shadow: var(--card-hover-shadow);
}

.pub-title {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-main);
}

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

.pub-authors strong {
    color: var(--text-main);
}

.pub-venue {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary-color);
}

.pub-links {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

/* Skills Box */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: var(--card-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.skill-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}