/* ==========================================================================
   Kundan - SPASE IITK Portfolio Website Stylesheet
   Modern, Responsive, Space-Themed Design with Dark/Light Support
   ========================================================================== */

:root {
    /* Color Palette - Dark Theme (Default) */
    --bg-primary: #070a13;
    --bg-secondary: #0d1222;
    --bg-card: rgba(16, 23, 42, 0.7);
    --bg-card-hover: rgba(23, 34, 62, 0.85);
    --bg-glass: rgba(15, 23, 42, 0.65);
    
    --border-color: rgba(56, 189, 248, 0.15);
    --border-glow: rgba(56, 189, 248, 0.35);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-blue: #0284c7;
    --accent-cyan: #38bdf8;
    --accent-indigo: #6366f1;
    --accent-amber: #f59e0b;
    --accent-emerald: #10b981;
    
    --gradient-primary: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #a855f7 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(99, 102, 241, 0.08) 100%);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(56, 189, 248, 0.15), transparent 70%);

    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);

    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Space Grotesk', var(--font-sans);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-primary: #f1f5f9;
    --bg-secondary: #e2e8f0;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.98);
    --bg-glass: rgba(255, 255, 255, 0.75);
    
    --border-color: rgba(14, 116, 144, 0.2);
    --border-glow: rgba(2, 132, 199, 0.4);
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    --accent-blue: #0284c7;
    --accent-cyan: #0284c7;
    --accent-indigo: #4f46e5;
    
    --gradient-primary: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(79, 70, 229, 0.05) 100%);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(2, 132, 199, 0.1), transparent 70%);

    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.15);
}

/* ==========================================================================
   Base & Resets
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Canvas Background */
#space-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.85;
}

[data-theme="light"] #space-canvas {
    opacity: 0.25;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    outline: none;
}

/* ==========================================================================
   Utility Classes & Layout
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    position: relative;
    z-index: 1;
}

.section {
    padding: 5.5rem 0;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 3.5rem auto;
}

.section-tag {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: var(--gradient-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 0.85rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-panel:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    padding: 0.85rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.55);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-glow);
    color: var(--text-primary);
    backdrop-filter: blur(8px);
}

.btn-outline:hover {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.5rem 1.15rem;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
}

.btn-block {
    width: 100%;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 1rem 0;
    transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), padding var(--transition-normal), border-color var(--transition-normal);
}

.header.scrolled {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.logo-mark {
    width: 42px;
    height: 42px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.25rem;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text .name {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: 0.02em;
}

.logo-text .dept {
    font-size: 0.75rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.55rem 0.95rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.45rem;
    transition: all var(--transition-fast);
}

.nav-link i {
    font-size: 0.85rem;
    color: var(--accent-cyan);
    opacity: 0.8;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: rgba(56, 189, 248, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: rotate(15deg);
}

.moon-icon {
    display: block;
}

.sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: block;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 101;
}

.mobile-toggle .bar {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.mobile-toggle.active .bar:nth-child(2) {
    opacity: 0;
}
.mobile-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 7.5rem;
    padding-bottom: 4rem;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
    align-items: center;
}

.badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.4rem 1.1rem;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-cyan);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7); }
    70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(56, 189, 248, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 0.85rem;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.45rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.hero-subtitle .divider {
    color: var(--accent-cyan);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2.2rem;
}

.hero-description strong {
    color: var(--text-primary);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    margin-bottom: 3.5rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.stat-card {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
    display: inline;
}

.stat-plus {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-left: 2px;
}

.stat-label {
    font-size: 0.825rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 0.35rem;
}

/* Hero Visual / Avatar Card */
.hero-visual {
    display: flex;
    justify-content: center;
    position: relative;
}

.avatar-card {
    position: relative;
    width: 320px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-wrapper {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, rgba(13, 18, 34, 0.9) 80%);
    border: 3px solid var(--border-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 40px rgba(56, 189, 248, 0.3);
    position: relative;
    z-index: 2;
}

.avatar-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.avatar-icon {
    font-size: 6.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 4px 10px rgba(56, 189, 248, 0.4));
}

.orbit-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px dashed rgba(56, 189, 248, 0.35);
    pointer-events: none;
}

.orbit-ring-1 {
    width: 340px;
    height: 340px;
    animation: rotateOrbit 25s linear infinite;
}

.orbit-ring-2 {
    width: 410px;
    height: 410px;
    border-style: dotted;
    border-color: rgba(99, 102, 241, 0.3);
    animation: rotateOrbit 38s linear infinite reverse;
}

@keyframes rotateOrbit {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.floating-badge {
    position: absolute;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-glow);
    padding: 0.65rem 1rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-md);
    z-index: 3;
    animation: floatBadge 4s ease-in-out infinite;
}

.floating-badge i {
    font-size: 1.35rem;
    color: var(--accent-cyan);
}

.floating-badge strong {
    display: block;
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.floating-badge small {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.badge-iitk {
    top: 5%;
    left: -15%;
    animation-delay: 0s;
}

.badge-role {
    bottom: 5%;
    right: -10%;
    animation-delay: 2s;
}

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

/* ==========================================================================
   About Section
   ========================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2rem;
}

.about-text-card, .about-details-card {
    padding: 2.5rem;
}

.about-text-card h3, .about-details-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.about-text-card p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

.about-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1.85rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 0.925rem;
    color: var(--text-primary);
}

.highlight-item i {
    color: var(--accent-cyan);
    font-size: 1rem;
    flex-shrink: 0;
}

.profile-info-list {
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
}

.profile-info-list li {
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.85rem;
}

.profile-info-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.info-label {
    font-size: 0.825rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.info-label i {
    color: var(--accent-cyan);
}

.info-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.status-active {
    display: inline-flex;
    align-items: center;
    color: var(--accent-emerald);
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.75rem;
}

.skill-card {
    padding: 2.25rem;
    display: flex;
    flex-direction: column;
}

.skill-icon-wrapper {
    width: 54px;
    height: 54px;
    border-radius: var(--radius-md);
    background: var(--gradient-subtle);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent-cyan);
    font-size: 1.5rem;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.15);
    transition: transform var(--transition-normal), color var(--transition-normal);
}

.skill-card:hover .skill-icon-wrapper {
    transform: scale(1.1) rotate(5deg);
    color: #fff;
    background: var(--gradient-primary);
}

.skill-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.skill-card p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

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

.tag {
    padding: 0.3rem 0.75rem;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.775rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

/* ==========================================================================
   Laboratories & Systems
   ========================================================================== */
.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 2rem;
}

.lab-card {
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.lab-image-container {
    height: 150px;
    background: linear-gradient(135deg, rgba(14, 116, 144, 0.25) 0%, rgba(99, 102, 241, 0.25) 100%);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}

.lab-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

.lab-icon-feature {
    font-size: 3.5rem;
    color: rgba(255, 255, 255, 0.35);
    transition: transform var(--transition-normal);
}

.lab-card:hover .lab-icon-feature {
    transform: scale(1.15);
    color: var(--accent-cyan);
}

.lab-body {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.lab-body h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 0.85rem;
    color: var(--text-primary);
}

.lab-body p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.lab-checklist {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
}

.lab-checklist li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.lab-checklist li i {
    color: var(--accent-cyan);
    font-size: 0.8rem;
}

/* ==========================================================================
   Experience & Timeline
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-cyan) 0%, rgba(56, 189, 248, 0.1) 100%);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.75rem;
    padding-left: 2.5rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -20px;
    top: 0;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--accent-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    font-size: 1rem;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
    z-index: 2;
}

.timeline-content {
    padding: 2.25rem;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.role-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    color: var(--text-primary);
}

.institution {
    font-size: 0.95rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

.timeline-date {
    display: inline-block;
    padding: 0.3rem 0.85rem;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-summary {
    font-size: 0.975rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 1.25rem;
}

.responsibility-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.responsibility-list li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.35rem;
    line-height: 1.55;
}

.responsibility-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
    font-size: 1.25rem;
    line-height: 1;
}

/* ==========================================================================
   Values & Technical Philosophy
   ========================================================================== */
.values-wrapper {
    padding: 4rem 2.5rem;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.value-item {
    text-align: center;
    padding: 1.5rem;
}

.value-item i {
    font-size: 2.5rem;
    color: var(--accent-cyan);
    margin-bottom: 1.25rem;
    display: inline-block;
}

.value-item h4 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.value-item p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 2.5rem;
}

.contact-info-column {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.contact-card {
    padding: 1.75rem;
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-subtle);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    font-size: 1.35rem;
    flex-shrink: 0;
}

.contact-card-text h4 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.contact-card-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.contact-card-text small {
    display: block;
    font-size: 0.775rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

.contact-link {
    color: var(--accent-cyan);
    font-weight: 600;
}

.contact-link:hover {
    text-decoration: underline;
}

.form-wrapper {
    padding: 2.75rem;
}

.form-wrapper h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.form-wrapper > p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.925rem;
    transition: all var(--transition-fast);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group select,
[data-theme="light"] .form-group textarea {
    background: #ffffff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.form-group option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-feedback {
    margin-top: 1.25rem;
    padding: 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: none;
}

.form-feedback.success {
    display: block;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--accent-emerald);
    color: var(--accent-emerald);
}

.form-feedback.error {
    display: block;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid #ef4444;
    color: #ef4444;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem 0;
    position: relative;
    z-index: 1;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-brand h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-primary);
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-divider {
    height: 1px;
    background: var(--border-color);
    margin-bottom: 2rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-subtext {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    cursor: pointer;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background: var(--accent-cyan);
    color: #ffffff;
    border-color: var(--accent-cyan);
    transform: translateY(-4px);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-content {
        order: 2;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .hero-visual {
        order: 1;
    }

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

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

    .hero-stats {
        width: 100%;
        max-width: 500px;
    }

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

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

@media (max-width: 768px) {
    .section {
        padding: 4rem 0;
    }

    .hide-mobile {
        display: none !important;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-secondary);
        border-left: 1px solid var(--border-color);
        padding: 5rem 2rem 2rem 2rem;
        box-shadow: var(--shadow-md);
        transition: right var(--transition-normal);
        z-index: 100;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.25rem;
    }

    .nav-link {
        font-size: 1.05rem;
        width: 100%;
        padding: 0.75rem 1rem;
    }

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

    .timeline {
        padding-left: 1rem;
    }

    .timeline-item {
        padding-left: 1.75rem;
    }

    .timeline-marker {
        left: -15px;
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }

    .footer-top {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .avatar-card {
        width: 260px;
        height: 260px;
    }

    .avatar-wrapper {
        width: 210px;
        height: 210px;
    }

    .avatar-placeholder {
        width: 170px;
        height: 170px;
    }

    .avatar-icon {
        font-size: 5rem;
    }

    .orbit-ring-1 {
        width: 280px;
        height: 280px;
    }

    .orbit-ring-2 {
        width: 330px;
        height: 330px;
    }

    .floating-badge {
        padding: 0.45rem 0.75rem;
    }

    .badge-iitk {
        left: -5%;
    }

    .badge-role {
        right: -5%;
    }
}