/* ==========================================
   PERSONAL PORTFOLIO - DESIGN SYSTEM
   Modern Dark Theme for Bidisha Bhowal
   ========================================== */

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

/* === CSS CUSTOM PROPERTIES === */
:root {
    /* Color Palette - Dark Theme */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-elevated: #1f1f1f;

    /* Accent Colors */
    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #06b6d4;
    --color-accent-success: #10b981;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-card: linear-gradient(145deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);

    /* Text Colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1aa;
    --color-text-tertiary: #71717a;
    --color-text-muted: #52525b;

    /* Border & Divider */
    --color-border: transparent;
    --color-border-hover: transparent;

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: transparent;
    --glass-backdrop: blur(10px);

    /* Spacing Scale */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Constraints */
    --container-max: 1200px;
    --container-padding: var(--space-md);
}

/* === RESET & BASE STYLES === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
}

h3 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
}

h4 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
}

p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-accent-secondary);
}

/* === LAYOUT === */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-3xl) 0;
    position: relative;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 100%);
}

.section::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 150px;
    background: linear-gradient(to bottom, transparent, rgba(10, 10, 10, 0.5));
    pointer-events: none;
    z-index: 1;
}


.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto;
}

/* === COMPONENTS === */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.875rem 1.75rem;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    backdrop-filter: var(--glass-backdrop);
}

.btn-secondary:hover {
    border-color: var(--color-accent-primary);
    background: var(--glass-bg);
    transform: translateY(-2px);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.375rem 0.875rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-backdrop);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--color-accent-success);
}

.badge-primary {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--color-accent-primary);
}

/* Cards */
.card {
    background: var(--color-bg-elevated);
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

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

.card-glass {
    background: var(--glass-bg);
    border: none;
    backdrop-filter: var(--glass-backdrop);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* === HEADER & NAVIGATION === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
}

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

.logo {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-text-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-text-primary);
    border-radius: 3px;
    transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

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


/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    padding-bottom: var(--space-3xl);
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, #0a0a0a 0%, #1a1a2e 80%, rgba(10, 10, 10, 0.5) 100%);
}


@keyframes heroGlow {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(-10%, -10%) scale(1.1);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 900px;
    width: 100%;
    text-align: center;
}

.hero-text {
    text-align: center;
}

.hero-profile-image {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    position: relative;
    animation: fadeInRight 0.8s ease-out, float 6s ease-in-out 1s infinite;
    order: 2;
}

.hero-profile-image::before {
    content: '';
    position: absolute;
    inset: -4px;
    background: var(--gradient-primary);
    border-radius: 50%;
    z-index: -1;
    animation: pulse 3s ease-in-out infinite;
}

.hero-profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--color-bg-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.section-illustration {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-md);
    opacity: 0.9;
}

.section-illustration img {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-badge {
    margin-bottom: var(--space-lg);
    animation: fadeInDown 0.6s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
    line-height: 1.6;
    animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 0.6s ease-out 0.6s backwards;
}

.social-links {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    justify-content: center;
    animation: fadeInUp 0.6s ease-out 0.8s backwards;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--glass-bg);
    border: none;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

/* === ABOUT SECTION === */
#about {
    background: linear-gradient(180deg, rgba(10, 10, 10, 0.3) 0%, #16213e 20%, #16213e 80%, rgba(22, 33, 62, 0.5) 100%);
    position: relative;
    padding-top: calc(var(--space-3xl) + 2rem);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.about-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
}

.about-text p {
    margin-bottom: var(--space-md);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.highlight-item {
    padding: var(--space-md);
    background: var(--gradient-card);
    border: none !important;
    box-shadow: none !important;
    border-radius: var(--radius-lg);
    text-align: center;
}

.highlight-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

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

/* === EXPERIENCE SECTION === */
.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: transparent;
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-2xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-xl) - 6px);
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    background: var(--color-accent-primary);
    box-shadow: 0 0 0 4px var(--color-bg-primary), 0 0 0 6px var(--color-accent-primary);
}

.timeline-date {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--glass-bg);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent-primary);
    margin-bottom: var(--space-sm);
}

.timeline-content h3 {
    margin-bottom: var(--space-xs);
}

.timeline-company {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-md);
}

.timeline-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

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

.timeline-description li {
    position: relative;
    padding-left: var(--space-md);
    margin-bottom: var(--space-xs);
}

.timeline-description li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
}

/* === PUBLICATIONS SECTION === */
#publications {
    background: linear-gradient(180deg, rgba(22, 33, 62, 0.3) 0%, #1a1a2e 20%, #1a1a2e 80%, rgba(26, 26, 46, 0.5) 100%);
    position: relative;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-lg);
    position: relative;
    z-index: 1;
}

.publication-card {
    background: var(--color-bg-elevated);
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.publication-card:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.publication-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
    align-self: flex-start;
}

.publication-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.publication-journal {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
    font-style: italic;
    margin-bottom: var(--space-xs);
}

.publication-year {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
}

.publication-authors {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: var(--space-md);
    flex-grow: 1;
}

.publication-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-accent-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.publication-link:hover {
    gap: var(--space-sm);
    color: var(--color-accent-secondary);
}

/* === SKILLS SECTION === */
.skills-categories {
    display: grid;
    gap: var(--space-xl);
}

.skill-category {
    padding: var(--space-xl);
    background: var(--gradient-card);
    border: none;
    border-radius: var(--radius-xl);
}

.skill-category h3 {
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: var(--color-bg-elevated);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.skill-tag:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* === AWARDS SECTION === */
.awards-list {
    display: grid;
    gap: var(--space-lg);
}

.award-item {
    padding: var(--space-lg);
    background: var(--gradient-card);
    border: none;
    border-left: 3px solid var(--color-accent-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.award-item:hover {
    transform: translateX(8px);
    border-left-color: var(--color-accent-secondary);
}

.award-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text-primary);
}

.award-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* === CONTACT SECTION === */
#contact {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(26, 26, 46, 0.3) 0%, #16213e 20%, #0a0a0a 100%);
}


.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
    position: relative;
    z-index: 1;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--gradient-card);
    border: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.contact-item:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
}

.contact-icon {
    width: 24px;
    height: 24px;
    color: var(--color-accent-primary);
}

.contact-details h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-xs);
}

.contact-details p {
    color: var(--color-text-secondary);
    margin: 0;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    background: var(--color-bg-elevated);
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* === FOOTER === */
.footer {
    padding: var(--space-2xl) 0;
    text-align: center;
    background: #0a0a0a;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.footer p {
    color: var(--color-text-tertiary);
    margin: 0;
}

/* === ANIMATIONS === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-slow);
}

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

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
    }

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

@media (max-width: 768px) {
    :root {
        --space-3xl: 4rem;
        --space-2xl: 3rem;
    }

    .hero {
        min-height: 100vh;
        padding-top: 140px;
        padding-bottom: var(--space-3xl);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        padding: 5rem 2rem 2rem;
        transition: right var(--transition-base);
        z-index: 999;
    }

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

    .nav-links {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .nav-links a {
        font-size: var(--font-size-lg);
        padding: var(--space-sm) 0;
        display: block;
    }

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

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

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

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .social-links {
        gap: var(--space-sm);
    }

    .social-link {
        width: 40px;
        height: 40px;
    }
}

/* === UTILITY CLASSES === */
.text-center {
    text-align: center;
}

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

.mt-sm {
    margin-top: var(--space-sm);
}

.mt-md {
    margin-top: var(--space-md);
}

.mt-lg {
    margin-top: var(--space-lg);
}

.mb-sm {
    margin-bottom: var(--space-sm);
}

.mb-md {
    margin-bottom: var(--space-md);
}

.mb-lg {
    margin-bottom: var(--space-lg);
}