/* ========================================================================
   Krishna Vudugula — Portfolio Styles
   Premium Editorial Design System
   ======================================================================== */

/* --- Google Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@300;400;500;600&display=swap');

/* --- Design Tokens --- */
:root {
    --font-heading: 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Light Mode (default) */
    --bg: #FAFAF8;
    --bg-surface: #FFFFFF;
    --bg-surface-alt: #F5F5F3;
    --bg-nav: rgba(250, 250, 248, 0.88);

    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-soft: rgba(37, 99, 235, 0.07);
    --accent: #D97706;
    --accent-soft: rgba(217, 119, 6, 0.08);

    --text: #1E1E20;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;

    --border: #E5E7EB;
    --border-hover: #D1D5DB;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06), 0 1px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.1), 0 8px 20px rgba(0,0,0,0.05);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-pill: 100px;

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

    --container-max: 1120px;
    --section-spacing: 120px;
}

/* --- Dark Mode --- */
body.dark-mode {
    --bg: #141416;
    --bg-surface: #1E1E22;
    --bg-surface-alt: #28282E;
    --bg-nav: rgba(20, 20, 22, 0.9);

    --primary: #60A5FA;
    --primary-hover: #93C5FD;
    --primary-soft: rgba(96, 165, 250, 0.1);
    --accent: #FBBF24;
    --accent-soft: rgba(251, 191, 36, 0.1);

    --text: #F0F0F2;
    --text-secondary: #9CA3AF;
    --text-tertiary: #6B7280;

    --border: #2E2E34;
    --border-hover: #3E3E46;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.25);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.3);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.4);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition-base), color var(--transition-base);
}

a { cursor: pointer; color: inherit; }
button { cursor: pointer; font-family: inherit; }
img { max-width: 100%; display: block; }

/* --- Scroll Progress Bar --- */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: var(--primary);
    z-index: 9999;
    transition: none;
    border-radius: 0 2px 2px 0;
}

/* --- Container --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 28px;
}

/* ========================================================================
   NAVIGATION
   ======================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}
.logo:hover { opacity: 0.7; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    position: relative;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-links a:hover {
    color: var(--text);
    background: var(--primary-soft);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
    transform: scaleX(0);
    transition: transform var(--transition-base);
}
.nav-links a:hover::after { transform: scaleX(1); }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all var(--transition-fast);
}
.theme-toggle:hover {
    border-color: var(--border-hover);
    color: var(--text);
    background: var(--bg-surface-alt);
}

/* Hamburger */
.hamburger {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: transparent;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all var(--transition-fast);
}
.hamburger span {
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition-base);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile nav overlay */
.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    z-index: 999;
    padding: 20px 28px;
    flex-direction: column;
    gap: 4px;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
}
.mobile-nav.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}
.mobile-nav a {
    display: block;
    color: var(--text);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-heading);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}
.mobile-nav a:hover { background: var(--primary-soft); }

/* ========================================================================
   HERO
   ======================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.hero-greeting {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.5px;
}
.hero-greeting::before {
    content: '';
    width: 32px;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

.hero-name {
    font-family: var(--font-heading);
    font-size: clamp(2.8rem, 5.5vw, 4.2rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -2px;
    color: var(--text);
}

.hero-tagline {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-secondary);
    min-height: 1.7em;
}

.hero-tagline .cursor {
    display: inline-block;
    width: 2px;
    height: 1.15em;
    background: var(--primary);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: cursorBlink 0.8s ease infinite;
}

@keyframes cursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-description {
    max-width: 480px;
    font-size: 1.02rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 8px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 30px;
    background: #0072ff;
    color: #FFFFFF;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 30px;
    background: transparent;
    color: var(--text);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition-base);
}
.btn-outline:hover {
    border-color: var(--text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hero-socials {
    display: flex;
    gap: 12px;
    margin-top: 4px;
}
.hero-socials a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    text-decoration: none;
    transition: all var(--transition-base);
}
.hero-socials a:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-soft);
    transform: translateY(-2px);
}

/* Hero image */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
    transition: transform var(--transition-slow);
}
.hero-image-wrapper:hover img {
    transform: translateY(-6px) scale(1.01);
}

/* Decorative elements behind profile image */
.hero-image-wrapper::before {
    content: '';
    position: absolute;
    top: -12px;
    right: -12px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--primary);
    border-radius: var(--radius-xl);
    opacity: 0;
    z-index: 1;
    transition: all var(--transition-slow);
}
.hero-image-wrapper:hover::before {
    top: -16px;
    right: -16px;
    opacity: 0;
}

.hero-image-wrapper::after {
    position: absolute;
    bottom: -20px;
    left: -20px;
    width: 100px;
    height: 100px;
    background: var(--accent-soft);
    border-radius: 50%;
    z-index: 0;
    filter: blur(1px);
}

/* Floating decoration dots */
.hero-dots {
    position: absolute;
    top: 20px;
    left: -40px;
    display: grid;
    grid-template-columns: repeat(4, 6px);
    gap: 10px;
    z-index: 0;
}
.hero-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border);
    opacity: 0.6;
}

/* ========================================================================
   SECTION COMMON
   ======================================================================== */
.section {
    padding: var(--section-spacing) 0;
}

.section-header {
    margin-bottom: 56px;
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
}
.section-label::before {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(1.8rem, 3.5vw, 2.4rem);
    font-weight: 800;
    color: var(--text);
    letter-spacing: -1px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin-top: 12px;
}

/* ========================================================================
   ABOUT SECTION
   ======================================================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    font-size: 1.02rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 20px;
}
.about-text strong {
    color: var(--text);
    font-weight: 600;
}

.expertise-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 28px;
}

.expertise-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all var(--transition-base);
}
.expertise-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.expertise-card .icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 1.15rem;
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
}
.expertise-card h4 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}
.expertise-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Education */
.education-block {
    margin-top: 60px;
}

.education-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 24px;
}

.edu-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}
.edu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    border-radius: 0 2px 2px 0;
    transition: width var(--transition-base);
}
.edu-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}
.edu-card:hover::before { width: 5px; }

.edu-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 8px;
}

.edu-degree {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
}

.edu-year {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    padding: 4px 12px;
    background: var(--primary-soft);
    border-radius: var(--radius-pill);
    white-space: nowrap;
}

.edu-institution {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 14px;
}

.edu-details {
    list-style: none;
    padding: 0;
    margin: 0;
}
.edu-details li {
    font-size: 0.87rem;
    color: var(--text-secondary);
    padding-left: 18px;
    margin-bottom: 6px;
    position: relative;
}
.edu-details li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
    font-size: 0.75rem;
}

/* ========================================================================
   SKILLS SECTION — Categorized Card Grid
   ======================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.skill-group-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.skill-group-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.skill-group-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.skill-group-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.skill-group-title {
    font-family: var(--font-heading);
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.skill-category-label {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.2px;
}

.skill-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--bg-surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    white-space: nowrap;
}
.skill-pill i {
    color: var(--primary);
    font-size: 0.82rem;
    width: 14px;
    text-align: center;
}
.skill-pill:hover {
    border-color: var(--primary);
    color: var(--text);
    background: var(--primary-soft);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Soft skill pills — slightly different accent */
.skill-pill.soft {
    background: var(--accent-soft);
    border-color: transparent;
}
.skill-pill.soft i {
    color: var(--accent);
}
.skill-pill.soft:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* Soft Skills bar below the grid */
.soft-skills-bar {
    margin-top: 36px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 28px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}


/* ========================================================================
   CERTIFICATIONS SECTION — CAROUSEL
   ======================================================================== */
.cert-carousel-wrapper {
    position: relative;
    overflow: hidden;
}

.cert-carousel-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: grab;
    touch-action: pan-y;
}
.cert-carousel-track.is-dragging {
    cursor: grabbing;
    transition: none;
}

.cert-carousel-page {
    min-width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 4px;
}

.cert-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all var(--transition-base);
    height: 100%;
}
.cert-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.cert-card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 1rem;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.cert-card-title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.4;
}

.cert-card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
}

.cert-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    margin-top: auto;
    transition: gap var(--transition-fast), color var(--transition-fast);
}
.cert-card-link:hover {
    gap: 10px;
}
.cert-card-link::after {
    content: '→';
    transition: transform var(--transition-fast);
}
.cert-card-link:hover::after {
    transform: translateX(2px);
}

/* Carousel Controls */
.cert-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 20px;
    padding: 0 4px;
}

.cert-arrow {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}
.cert-arrow:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}
.cert-arrow:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.cert-dots {
    display: flex;
    gap: 8px;
}
.cert-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: none;
    background: var(--border);
    transition: all var(--transition-base);
    padding: 0;
}
.cert-dot.active {
    background: var(--primary);
    width: 24px;
    border-radius: 4px;
}

/* ========================================================================
   PROJECTS SECTION
   ======================================================================== */
.project-filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin: -8px 0 28px;
    padding: 12px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.project-filter-intro {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    color: var(--text-muted);
    font-size: 0.78rem;
    white-space: nowrap;
}

.project-filter-mark {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.project-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.project-filter {
    padding: 7px 13px;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.project-filter:hover,
.project-filter.active {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--text);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
}
.project-card.is-hidden {
    display: none;
}
.project-card.is-filtered-in {
    animation: project-card-in 0.35s ease both;
}

@keyframes project-card-in {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.project-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.project-card-image {
    position: relative;
    overflow: hidden;
    height: 220px;
}
.project-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}
.project-card:hover .project-card-image img {
    transform: scale(1.04);
}

.project-card-body {
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.project-card-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.3;
}

.project-card-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
}

.project-card-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
    padding-top: 8px;
}

.project-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-family: var(--font-heading);
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
}

.project-btn-github {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}
.project-btn-github:hover {
    border-color: var(--text);
    color: var(--text);
    transform: translateY(-2px);
}

.project-btn-live {
    background: #0072ff;
    border: 1px solid var(--primary);
    color: #FFFFFF;
}
.project-btn-live:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

/* ========================================================================
   NAV CONTACT BUTTON
   ======================================================================== */
.nav-contact-btn {
    background: #0072ff !important;
    color: #FFFFFF !important;
    border-radius: var(--radius-sm) !important;
    padding: 8px 20px !important;
}
.nav-contact-btn:hover {
    background: var(--primary-hover) !important;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}
.nav-contact-btn::after { display: none !important; }

/* ========================================================================
   CONTACT MODAL
   ======================================================================== */
.contact-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
    padding: 20px;
}
.contact-modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.contact-modal {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px 36px 36px;
    width: 100%;
    max-width: 460px;
    position: relative;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px) scale(0.96);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.contact-modal-overlay.open .contact-modal {
    transform: translateY(0) scale(1);
}

.contact-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-surface-alt);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}
.contact-modal-close:hover {
    background: var(--border);
    color: var(--text);
    transform: rotate(90deg);
}

.contact-modal-header {
    text-align: center;
    margin-bottom: 28px;
}

.contact-modal-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 1.3rem;
    border-radius: 50%;
    margin: 0 auto 16px;
}

.contact-modal-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}

.contact-modal-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 6px;
}

.contact-modal-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    text-decoration: none;
    border: 1px solid var(--border);
    background: var(--bg);
    transition: all 0.25s ease, transform 0.25s ease;
    opacity: 0;
    transform: translateY(10px);
}
.contact-modal-overlay.open .contact-link {
    opacity: 1;
    transform: translateY(0);
}

.contact-link:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.contact-link-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 1.05rem;
    flex-shrink: 0;
}

.contact-link-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.contact-link-label {
    font-family: var(--font-heading);
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text);
}

.contact-link-value {
    font-size: 0.78rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.contact-link-arrow {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    transition: transform 0.2s ease, color 0.2s ease;
    flex-shrink: 0;
}
.contact-link:hover .contact-link-arrow {
    transform: translateX(3px);
    color: var(--text);
}

/* Per-platform accent colors */
.contact-link-email .contact-link-icon {
    background: rgba(37, 99, 235, 0.1);
    color: #2563EB;
}
.contact-link-email:hover { border-color: #2563EB; }

.contact-link-linkedin .contact-link-icon {
    background: rgba(10, 102, 194, 0.1);
    color: #0A66C2;
}
.contact-link-linkedin:hover { border-color: #0A66C2; }

.contact-link-instagram .contact-link-icon {
    background: linear-gradient(135deg, rgba(131, 58, 180, 0.1), rgba(253, 29, 29, 0.1), rgba(252, 176, 69, 0.1));
    color: #E1306C;
}
.contact-link-instagram:hover { border-color: #E1306C; }

.contact-link-github .contact-link-icon {
    background: rgba(36, 41, 47, 0.1);
    color: #24292F;
}
body.dark-mode .contact-link-github .contact-link-icon {
    background: rgba(240, 240, 240, 0.1);
    color: #F0F0F0;
}
.contact-link-github:hover { border-color: #24292F; }
body.dark-mode .contact-link-github:hover { border-color: #9CA3AF; }

.contact-link-resume .contact-link-icon {
    background: rgba(217, 119, 6, 0.1);
    color: #D97706;
}
.contact-link-resume:hover { border-color: #D97706; }

/* ========================================================================
   FOOTER
   ======================================================================== */
.footer {
    border-top: 1px solid var(--border);
    padding: 60px 0;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.footer-socials {
    display: flex;
    gap: 12px;
}
.footer-socials a {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 1.05rem;
    transition: all var(--transition-base);
}
.footer-socials a:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-soft);
    transform: translateY(-3px);
}

.footer-credit {
    font-size: 0.88rem;
    color: var(--text-tertiary);
}

/* ========================================================================
   SCROLL ANIMATIONS
   ======================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered children */
.stagger-children .reveal {
    transition-delay: calc(var(--i, 0) * 80ms);
}

.social-bar {
                position: fixed; right: 30px; bottom: 0; 
                display: flex; flex-direction: column; gap: 20px; padding-bottom: 30px; align-items: center;
            }
            .social-bar::after { content: ''; width: 1px; height: 60px; background: var(--border); }
            .social-icon { color: var(--text-muted); font-size: 1.2rem; transition: 0.2s; }
            .social-icon:hover { color: var(--primary); transform: translateY(-3px); }


/* ========================================================================
   RESPONSIVE
   ======================================================================== */

/* Tablet */
@media (max-width: 968px) {
    :root {
        --section-spacing: 80px;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    .hero-content { align-items: center; }
    .hero-description { max-width: 520px; }
    .hero-cta { justify-content: center; }
    .hero-socials { justify-content: center; }
    .hero-greeting::before { display: none; }

    .hero-visual { order: -1; }
    .hero-image-wrapper {
        width: 280px;
        height: 310px;
    }

    .about-grid { grid-template-columns: 1fr; }
    .education-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .expertise-grid { grid-template-columns: 1fr 1fr; }
    .skills-grid { grid-template-columns: repeat(2, 1fr); }

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

/* Mobile */
@media (max-width: 640px) {
    :root {
        --section-spacing: 64px;
    }

    .nav-links { display: none; }
    .hamburger { display: flex; }
    .mobile-nav { display: flex; }

    .hero-name { letter-spacing: -1px; }
    .hero-image-wrapper {
        width: 300px;
        height: 300px;
    }
    .hero-image-wrapper::before { display: none; }
    .hero-image-wrapper::after { display: none; }
    .hero-dots { display: none; }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    .btn-primary, .btn-outline { width: 100%; justify-content: center; }

    .expertise-grid { grid-template-columns: 1fr 1fr; }
    .skills-grid { grid-template-columns: 1fr; }

    .cert-carousel-page {
        grid-template-columns: 1fr;
    }

    .project-filter-bar {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }
    .project-filters {
        justify-content: flex-start;
    }

    .project-card-image { height: 180px; }

    .section-header { margin-bottom: 36px; }

    .soft-skills-bar { padding: 20px; }

    .contact-modal {
        padding: 32px 24px 28px;
        border-radius: var(--radius-lg);
    }
    .contact-modal-icon {
        width: 48px;
        height: 48px;
        font-size: 1.1rem;
    }
    .contact-modal-title { font-size: 1.3rem; }
    .contact-link { padding: 12px 14px; gap: 12px; }
    .contact-link-icon { width: 36px; height: 36px; font-size: 0.95rem; }
    .social-bar { display: none; }

    

    
}