:root {
    --bg-dark: #05070d;
    --bg-surface: #0c111c;
    --bg-card: rgba(14, 20, 36, 0.7);
    --bg-hover: rgba(20, 30, 50, 0.9);
    --border: rgba(0, 136, 255, 0.15);
    --border-strong: rgba(0, 136, 255, 0.4);
    --blue-500: #0088ff;
    --blue-400: #3aa3ff;
    --blue-600: #0066cc;
    --blue-glow: rgba(0, 136, 255, 0.5);
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-alpha: 0.90;
    --accent-gradient: linear-gradient(135deg, rgb(0 136 255 / var(--accent-alpha)) 0%, rgb(0 194 255 / var(--accent-alpha)) 50%, rgb(0 102 204 / var(--accent-alpha)) 100%);
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
    --bg-dark: #f5f7fb;
    --bg-surface: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-hover: rgba(240, 245, 255, 0.95);
    --border: rgba(0, 102, 204, 0.18);
    --border-strong: rgba(0, 102, 204, 0.45);
    --blue-500: #0066cc;
    --blue-400: #0088ff;
    --blue-600: #004499;
    --blue-glow: rgba(0, 102, 204, 0.25);
    --text-primary: #0a0f1c;
    --text-secondary: #475569;
    --text-muted: #64748b;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background 0.5s var(--ease), color 0.5s var(--ease);
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--blue-500), var(--blue-600));
    border-radius: 5px;
}

/* ============ THREE.JS + INTERACTIVE CANVAS BG ============ */
#threeBg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}
#particleCanvas {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

/* Gradient overlay for legibility */
.bg-overlay {
    position: fixed;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    background:
            radial-gradient(ellipse at 20% 10%, rgba(0, 136, 255, 0.15) 0%, transparent 50%),
            radial-gradient(ellipse at 80% 80%, rgba(0, 194, 255, 0.08) 0%, transparent 60%);
}

[data-theme="light"] .bg-overlay {
    background:
            radial-gradient(ellipse at 20% 10%, rgba(0, 136, 255, 0.12) 0%, transparent 50%),
            radial-gradient(ellipse at 80% 80%, rgba(0, 194, 255, 0.06) 0%, transparent 60%);
}

/* ============ NAVBAR ============ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    padding: 1.2rem 6%;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    background: rgba(5, 7, 13, 0.5);
    border-bottom: 1px solid var(--border);
    transition: all 0.4s var(--ease);
}

[data-theme="light"] .navbar {
    background: rgba(245, 247, 251, 0.6);
}

.navbar.scrolled {
    padding: 0.8rem 6%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.brand {
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-dot {
    width: 10px; height: 10px;
    background: var(--blue-500);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--blue-glow);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

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

.nav-menu {
    display: flex;
    gap: 2.2rem;
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.3px;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    bottom: -6px; left: 50%;
    width: 0; height: 2px;
    background: var(--blue-500);
    transform: translateX(-50%);
    transition: width 0.4s var(--ease);
}

.nav-menu a:hover { color: var(--text-primary); }
.nav-menu a:hover::before { width: 100%; }

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

.control-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(10px);
    transition: all 0.3s var(--ease);
    font-family: inherit;
}

.control-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--blue-glow);
}

.theme-toggle {
    width: 40px; height: 40px;
    padding: 0;
    justify-content: center;
    font-size: 1.1rem;
}

/* ============ HERO ============ */
.hero {
    min-height: 100vh;
    padding: 0 6%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 3;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--ease) 0.2s forwards;
}

.hero-badge::before {
    content: '';
    width: 8px; height: 8px;
    background: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 10px #10b981;
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: clamp(3rem, 11vw, 9rem);
    font-weight: 900;
    line-height: 0.95;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, var(--blue-400) 40%, var(--blue-600) 80%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    background-size: 200% 200%;
    animation: gradientShift 6s ease infinite, fadeInUp 1s var(--ease) 0.4s backwards;
    text-shadow: 0 0 80px rgba(0, 136, 255, 0.1);
}

[data-theme="light"] .hero-title {
    background: linear-gradient(135deg, #0a0f1c 0%, var(--blue-500) 50%, var(--blue-600) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 6s ease infinite, fadeInUp 1s var(--ease) 0.4s backwards;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.6rem);
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 1.5rem;
    font-weight: 400;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s var(--ease) 0.7s forwards;
}

.hero-desc {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 620px;
    margin: 0 auto 2.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s var(--ease) 0.9s forwards;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s var(--ease) 1.1s forwards;
}

.btn {
    padding: 14px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.4s var(--ease);
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 8px 30px var(--blue-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 40px var(--blue-glow);
}

.btn-ghost {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.btn-ghost:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    transform: translateY(-3px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-muted);
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeIn 1s 1.5s forwards, bounce 2s 2.5s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

@keyframes fadeInUp {
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn { to { opacity: 1; } }

/* ============ SECTIONS ============ */
section {
    position: relative;
    z-index: 3;
    padding: 8rem 6%;
}

.section-header {
    margin-bottom: 4rem;
    text-align: center;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(0, 136, 255, 0.1);
    color: var(--blue-400);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1rem;
}

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

.section-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 640px;
    margin: 0 auto;
}

/* Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============ ABOUT ============ */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1300px;
    margin: 0 auto;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
}

.about-text p strong {
    color: var(--text-primary);
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem 1.5rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    text-align: center;
    transition: all 0.4s var(--ease);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s var(--ease);
}

.stat-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    background: var(--bg-hover);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.stat-card:hover::before { transform: scaleX(1); }

.stat-num {
    font-size: 3rem;
    font-weight: 900;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: block;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ============ PROJECTS ============ */
.projects-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin: 0 auto;
}

.project-card {
    width: 400px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.5s var(--ease);
    position: relative;
    cursor: pointer;
    text-decoration: none;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--border-strong);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), 0 0 40px var(--blue-glow);
}

.project-img {
    width: 100%;
    height: 220px;
    overflow: hidden;
    position: relative;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--ease);
}

.project-card:hover .project-img img {
    transform: scale(1.08);
}

.project-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(5, 7, 13, 0.8) 100%);
    pointer-events: none;
}

[data-theme="light"] .project-img::after {
    background: linear-gradient(180deg, transparent 40%, rgba(255, 255, 255, 0.3) 100%);
}

.project-body {
    padding: 1.8rem;
}

.project-tag {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(0, 136, 255, 0.15);
    color: var(--blue-400);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    letter-spacing: 0.5px;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tech-pill {
    padding: 4px 10px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============ EXPERIENCE TIMELINE ============ */
.timeline {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 40px; top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--blue-500), transparent);
}

.exp-item {
    position: relative;
    padding-left: 90px;
    padding-bottom: 3rem;
}

.exp-dot {
    position: absolute;
    left: 32px; top: 6px;
    width: 18px; height: 18px;
    background: var(--bg-dark);
    border: 3px solid var(--blue-500);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--blue-glow);
}

.exp-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1.8rem;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: all 0.4s var(--ease);
}

.exp-card:hover {
    transform: translateX(8px);
    border-color: var(--border-strong);
    background: var(--bg-hover);
}

.exp-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.6rem;
    flex-wrap: wrap;
    gap: 10px;
}

.exp-company {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--blue-400);
}

.exp-period {
    padding: 4px 12px;
    background: rgba(0, 136, 255, 0.1);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.exp-role {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.exp-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.7;
}

.stack-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.stack-chip {
    padding: 4px 10px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.stack-chip:hover {
    border-color: var(--blue-500);
    color: var(--blue-400);
}

/* ============ SKILLS PROGRESS ============ */
.skills-grid {
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    /*grid-template-columns: 1fr 1fr;*/
    gap: 3rem;
}

.skill-group {
    width: 500px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.skill-group-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1.8rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-group-icon {
    width: 36px;
    height: 36px;
    /*background: var(--bg-surface);*/
    /*border: 1px solid var(--border);*/
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex: 0 0 36px;
}

.skill-group-icon i {
    display: block;
    color: var(--text-primary);
    font-size: 1.55rem;
    line-height: 1;
}

.skill-item {
    margin-bottom: 1.2rem;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 0.9rem;
}

.skill-name { font-weight: 500; color: var(--text-primary); }
.skill-years { color: var(--text-muted); font-size: 0.8rem; }
.skill-detail {
    padding: 0;
    margin: 0 0 5px;
    font-size: 0.7rem; color: var(--text-secondary);
}

.skill-bar {
    height: 6px;
    background: var(--bg-surface);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.skill-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
    width: 0;
    transition: width 1.5s var(--ease);
    position: relative;
}

.skill-fill::after {
    content: '';
    position: absolute;
    right: 0; top: 0; bottom: 0;
    width: 30px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4));
}

/* ============ EDUCATION ============ */
.edu-cards {
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.edu-card {
    width: 400px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    transition: all 0.4s var(--ease);
    position: relative;
    overflow: hidden;
}

.edu-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 3px;
    background: var(--accent-gradient);
}

.edu-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    background: var(--bg-hover);
}

.edu-year {
    color: var(--blue-400);
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.edu-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.edu-inst {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============ CONTACT ============ */
.contact-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.4s var(--ease);
    display: block;
}

.contact-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    background: var(--bg-hover);
    box-shadow: 0 20px 40px var(--blue-glow);
}

.contact-icon {
    width: 60px; height: 60px;
    margin: 0 auto 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.contact-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
}

.contact-value {
    font-weight: 600;
    font-size: 0.95rem;
    word-break: break-word;
}

/* ============ FOOTER ============ */
footer {
    position: relative;
    z-index: 3;
    padding: 3rem 6%;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
    .nav-menu { display: none; }
    .about-grid { grid-template-columns: 1fr; gap: 3rem; }
    .skills-grid { grid-template-columns: 1fr; }
    section { padding: 5rem 5%; }
    .timeline::before { left: 20px; }
    .exp-item { padding-left: 60px; }
    .exp-dot { left: 12px; }
}

@media (max-width: 600px) {
    .navbar { padding: 1rem 4%; }
    .brand { font-size: 1.1rem; }
    .control-btn { padding: 6px 10px; font-size: 0.75rem; }
    .theme-toggle { width: 36px; height: 36px; }
}