/* ============================================================
   KARAN KUMAR MEHER — PORTFOLIO
   Premium dark/light theme with glassmorphism, particles,
   scroll-reveal, and micro-animations.
   ============================================================ */

/* ====================== CSS VARIABLES ====================== */
:root {
    /* -- Dark theme (default) -- */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(30, 41, 59, 0.9);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-1: #6366f1;
    --accent-2: #8b5cf6;
    --accent-3: #06b6d4;
    --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #06b6d4);
    --gradient-hover: linear-gradient(135deg, #818cf8, #a78bfa, #22d3ee);
    --border: rgba(99, 102, 241, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    --nav-bg: rgba(10, 14, 26, 0.85);
    --code-bg: #1e1e2e;

    /* -- Typography -- */
    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* -- Sizing -- */
    --container: 1200px;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --nav-h: 72px;
}

/* -- Light theme overrides -- */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(241, 245, 249, 1);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: rgba(99, 102, 241, 0.12);
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(99, 102, 241, 0.12);
    --shadow-card: 0 8px 32px rgba(99, 102, 241, 0.08);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.08);
    --nav-bg: rgba(248, 250, 252, 0.85);
    --code-bg: #1e1e2e;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-h);
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background 0.4s ease, color 0.4s ease;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }

::selection {
    background: var(--accent-1);
    color: #fff;
}

/* ====================== UTILITY ====================== */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

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

/* ====================== PARTICLE CANVAS ====================== */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ====================== PRELOADER ====================== */
#preloader {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}
#preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    text-align: center;
}
.loader-text {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 24px;
}
.loader-bar {
    width: 200px;
    height: 3px;
    background: var(--glass-border);
    border-radius: 4px;
    overflow: hidden;
}
.loader-bar-inner {
    width: 0%;
    height: 100%;
    background: var(--gradient);
    border-radius: 4px;
    animation: loaderProgress 1.8s ease-in-out forwards;
}
@keyframes loaderProgress {
    0% { width: 0; }
    100% { width: 100%; }
}

/* ====================== NAVIGATION ====================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-h);
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.4s ease;
}
.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}
.navbar.nav-hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 2px;
    transition: transform 0.3s ease;
}
.nav-logo:hover { transform: scale(1.05); }
.logo-bracket { color: var(--accent-3); }
.logo-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.nav-menu {
    display: flex;
    gap: 8px;
}
.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-xs);
    position: relative;
    transition: color 0.3s ease, background 0.3s ease;
    color: var(--text-secondary);
}
.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--glass-bg);
}
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--gradient);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}
.theme-toggle:hover {
    color: var(--accent-1);
    border-color: var(--accent-1);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px 0;
}
.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ====================== BUTTONS ====================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
    transform: translateY(-2px);
}
.btn-outline {
    border: 1.5px solid var(--border);
    color: var(--text-primary);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
}
.btn-outline:hover {
    border-color: var(--accent-1);
    box-shadow: 0 0 25px rgba(99, 102, 241, 0.15);
    transform: translateY(-2px);
}

/* ====================== HERO ====================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
    padding-top: var(--nav-h);
}

.hero-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 60px 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    border-radius: 50px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    font-size: 0.85rem;
    color: var(--accent-3);
    margin-bottom: 24px;
    animation: fadeInDown 0.8s ease;
}
.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 16px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    animation: fadeInUp 0.8s ease 0.4s both;
}
.typing-text {
    color: var(--accent-1);
    font-weight: 600;
}
.typing-cursor {
    color: var(--accent-1);
    animation: blink 0.8s infinite;
    font-weight: 300;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 540px;
    margin-bottom: 32px;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.8s both;
}

.hero-socials {
    display: flex;
    gap: 14px;
    animation: fadeInUp 0.8s ease 1s both;
}
.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    transition: all 0.35s ease;
}
.social-link:hover {
    color: #fff;
    background: var(--accent-1);
    border-color: var(--accent-1);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.35);
}

/* Code Window */
.hero-visual {
    animation: fadeInRight 1s ease 0.6s both;
}
.code-window {
    background: var(--code-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-card), var(--shadow-glow);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.code-window:hover {
    transform: translateY(-6px) rotateX(2deg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 60px rgba(99, 102, 241, 0.12);
}
.code-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.code-dots {
    display: flex;
    gap: 7px;
}
.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }
.code-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #64748b;
    margin-left: auto;
}
.code-body {
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    overflow-x: auto;
    color: #cbd5e1;
}
.code-keyword { color: #c678dd; }
.code-class { color: #e5c07b; }
.code-func { color: #61afef; }
.code-param { color: #e06c75; }
.code-string { color: #98c379; }

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.8rem;
    animation: fadeInUp 1s ease 1.2s both;
}
.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 14px;
    position: relative;
}
.mouse-wheel {
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 4px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 1.5s infinite;
}
@keyframes scrollWheel {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* ====================== SECTIONS (shared) ====================== */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-3);
    display: block;
    margin-bottom: 12px;
}
.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    margin-bottom: 12px;
}
.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

/* ====================== ABOUT ====================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

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

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all 0.35s ease;
}
.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-1);
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
}
.stat-icon {
    font-size: 1.6rem;
    margin-bottom: 12px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-number {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-number::after { content: '+'; }
.stat-label {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ====================== SKILLS ====================== */
.skills-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px;
    backdrop-filter: blur(10px);
    transition: all 0.35s ease;
}
.skill-category:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-1);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 22px;
}
.category-header i {
    font-size: 1.4rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.category-header h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    transition: all 0.3s ease;
}
.skill-tag:hover {
    border-color: var(--accent-1);
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.08);
    transform: translateY(-2px);
}
.skill-tag i {
    font-size: 0.95rem;
    color: var(--accent-1);
}

/* ====================== PROJECTS ====================== */
.project-filters {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.filter-btn {
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    transition: all 0.3s ease;
}
.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 28px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
}
.project-card:hover {
    border-color: var(--accent-1);
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25), var(--shadow-glow);
}
.project-card.hidden-card {
    display: none;
}

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}
.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(6, 182, 212, 0.12));
    font-size: 3.5rem;
    color: var(--accent-1);
    transition: transform 0.5s ease;
}
.project-card:hover .project-placeholder {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    background: rgba(10, 14, 26, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    opacity: 0;
    transition: opacity 0.35s ease;
}
.project-card:hover .project-overlay {
    opacity: 1;
}
.project-link {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    background: var(--accent-1);
    transition: all 0.3s ease;
    transform: translateY(20px);
}
.project-card:hover .project-link {
    transform: translateY(0);
}
.project-link:hover {
    background: var(--accent-2);
    transform: scale(1.1) !important;
}

.project-info {
    padding: 24px;
}
.project-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}
.project-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}
.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.project-tech span {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 500;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-1);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

/* ====================== TIMELINE ====================== */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    padding-left: 40px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: -40px;
    top: 6px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 3px solid var(--accent-1);
    z-index: 1;
    transition: all 0.3s ease;
}
.timeline-item:hover .timeline-dot {
    background: var(--accent-1);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 28px;
    backdrop-filter: blur(10px);
    transition: all 0.35s ease;
}
.timeline-content:hover {
    border-color: var(--accent-1);
    box-shadow: var(--shadow-glow);
}
.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-3);
    display: block;
    margin-bottom: 8px;
}
.timeline-content h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}
.timeline-content p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ====================== CONTACT ====================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 48px;
    align-items: start;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    backdrop-filter: blur(10px);
    transition: all 0.35s ease;
}
.contact-card:hover {
    border-color: var(--accent-1);
    transform: translateX(6px);
    box-shadow: var(--shadow-glow);
}
.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-1);
    flex-shrink: 0;
}
.contact-details h3 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 2px;
}
.contact-details a,
.contact-details p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}
.contact-details a:hover { color: var(--accent-1); }

.contact-socials {
    display: flex;
    gap: 14px;
    margin-top: 8px;
}
.contact-social-link {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    transition: all 0.35s ease;
}
.contact-social-link:hover {
    color: #fff;
    background: var(--accent-1);
    border-color: var(--accent-1);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.35);
}

/* Contact Form */
.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 36px;
    backdrop-filter: blur(10px);
}

.form-group {
    position: relative;
    margin-bottom: 28px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 0 8px 0;
    font-size: 0.95rem;
    font-family: var(--font-body);
    color: var(--text-primary);
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--glass-border);
    outline: none;
    transition: border-color 0.3s ease;
}
.form-group input:focus,
.form-group textarea:focus {
    border-bottom-color: var(--accent-1);
}
.form-group textarea { resize: vertical; min-height: 100px; }

.form-group label {
    position: absolute;
    left: 0;
    top: 16px;
    font-size: 0.92rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: all 0.3s ease;
}
.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: -4px;
    font-size: 0.75rem;
    color: var(--accent-1);
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width 0.4s ease;
}
.form-group input:focus ~ .form-line,
.form-group textarea:focus ~ .form-line {
    width: 100%;
}

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

.form-status {
    text-align: center;
    margin-top: 16px;
    font-size: 0.9rem;
    font-weight: 500;
    min-height: 24px;
}
.form-status.success { color: #22c55e; }
.form-status.error { color: #ef4444; }

/* ====================== FOOTER ====================== */
.footer {
    position: relative;
    z-index: 1;
    padding: 50px 0 30px 0;
    border-top: 1px solid var(--glass-border);
}
.footer-content {
    text-align: center;
}
.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    margin-bottom: 14px;
}
.footer-text {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}
.footer-socials {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}
.footer-socials a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}
.footer-socials a:hover {
    color: #fff;
    background: var(--accent-1);
    border-color: var(--accent-1);
    transform: translateY(-3px);
}
.footer-copyright {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ====================== BACK TO TOP ====================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient);
    color: #fff;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.35s ease;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

/* ====================== ANIMATIONS ====================== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Scroll-reveal */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ====================== RESPONSIVE ====================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    .hero-description { margin-left: auto; margin-right: auto; }
    .hero-cta { justify-content: center; }
    .hero-socials { justify-content: center; }
    .hero-visual { max-width: 500px; margin: 0 auto; }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root { --nav-h: 64px; }

    .nav-menu {
        position: fixed;
        top: var(--nav-h);
        left: 0;
        width: 100%;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--glass-border);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        transform: translateY(-120%);
        opacity: 0;
        transition: all 0.4s ease;
    }
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }
    .nav-toggle { display: flex; }
    .nav-link { padding: 12px 16px; }

    .section { padding: 70px 0; }
    .section-header { margin-bottom: 40px; }

    .hero-container { padding: 40px 24px; }
    .hero-title { font-size: clamp(1.8rem, 6vw, 2.4rem); }
    .hero-subtitle { font-size: 1.1rem; justify-content: center; }
    .hero-badge { font-size: 0.78rem; }

    .about-stats {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }
    .stat-card { padding: 20px; }
    .stat-number { font-size: 1.8rem; }

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

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

    .contact-form { padding: 24px; }

    .scroll-indicator { display: none; }
}

@media (max-width: 480px) {
    .hero-cta { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
    .about-stats { grid-template-columns: 1fr; }
    .project-filters { gap: 6px; }
    .filter-btn { padding: 8px 16px; font-size: 0.82rem; }
}