/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Backgrounds */
    --bg-deep:    #07070e;
    --bg-card:    #0c0c1a;
    --bg-surface: #0f0f1e;
    --bg-hover:   #151526;

    /* Text */
    --text-primary:   #f4f4fc;
    --text-secondary: #c4c4e0;
    --text-muted:     #9898be;

    /* Accent palette */
    --accent:     #00d4b8;
    --accent-dim: rgba(0, 212, 184, 0.12);
    --amber:      #f59e0b;
    --blue:       #5b8ef5;
    --green:      #34d399;
    --rose:       #fb7185;

    /* Borders */
    --border:       rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);

    /* Fonts */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body:    'IBM Plex Sans', system-ui, sans-serif;
    --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

    /* Transitions */
    --ease:       cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.3s var(--ease);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-deep);
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ========================================
   Reveal animations
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
    transition-delay: var(--delay, 0s);
}
.reveal.visible {
    opacity: 1;
    transform: none;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 1.75rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 1rem 2.5rem;
    background: rgba(7, 7, 14, 0.88);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--accent);
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width 0.3s var(--ease);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 22px;
    height: 2px;
    background: var(--text-secondary);
    transition: var(--transition);
}

/* ========================================
   Hero
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-deep);
    overflow: hidden;
}

#neural-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hero-vignette {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% 50%, transparent 30%, rgba(7,7,14,0.7) 100%),
        linear-gradient(to bottom, transparent 60%, var(--bg-deep) 100%);
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem;
    max-width: 880px;
}

.hero-overline {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.1s forwards;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3.8rem, 11vw, 8.5rem);
    font-weight: 300;
    line-height: 1;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 0.6s var(--ease) 0.2s forwards;
}

.hero-roles {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.35s forwards;
}

.hero-role-tag {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.hero-role-sep {
    color: var(--accent);
    font-size: 0.7rem;
}

.hero-tagline {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.45s forwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.55s forwards;
}

.btn {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.85rem 2rem;
    border-radius: 2px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-deep);
}

.btn-primary:hover {
    background: #00bfa6;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 212, 184, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-hover);
}

.btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.65s forwards;
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent);
    transform: translateY(-3px);
}

/* Scroll indicator */
.hero-scroll {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    opacity: 0;
    animation: fadeIn 0.5s var(--ease) 0.75s forwards;
}

.hero-scroll a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
}

.scroll-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: var(--border-hover);
    position: relative;
    overflow: hidden;
}

.scroll-dot {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 30%;
    background: var(--accent);
    animation: scrollDrop 1.8s var(--ease) infinite;
}

/* ========================================
   Section common
   ======================================== */
section { padding: 7rem 0; }

.section-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 2rem;
    opacity: 0.8;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.15;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 3.5rem;
}

/* ========================================
   About
   ======================================== */
.about {
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 4rem;
    align-items: start;
}

.about-text .section-title {
    margin-bottom: 1.5rem;
}

.about-text .lead {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-style: italic;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    border-left: 2px solid var(--accent);
    padding-left: 1.25rem;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-size: 0.97rem;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: 5.5rem; /* align roughly with text content */
}

.highlight-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 2px solid var(--accent);
    padding: 1.25rem 1.5rem;
    border-radius: 2px;
    transition: var(--transition);
}

.highlight-item:hover {
    border-left-color: var(--accent);
    background: var(--bg-hover);
    transform: translateX(4px);
}

.highlight-icon {
    color: var(--accent);
    font-size: 1.1rem;
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.highlight-body h4 {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.35rem;
}

.highlight-body p {
    font-size: 0.92rem;
    color: var(--text-primary);
    margin: 0;
}

.highlight-body .small {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

/* ========================================
   Projects
   ======================================== */
.projects { background: var(--bg-deep); }

/* Category legend */
.project-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.legend-item {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.legend-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.legend-item[data-cat="nlp"] .legend-dot     { background: var(--accent); }
.legend-item[data-cat="vision"] .legend-dot  { background: var(--blue); }
.legend-item[data-cat="research"] .legend-dot{ background: var(--green); }
.legend-item[data-cat="sports"] .legend-dot  { background: var(--amber); }
.legend-item[data-cat="industry"] .legend-dot{ background: var(--rose); }

/* Project grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.25rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--card-accent, var(--accent));
    border-radius: 2px;
    padding: 1.75rem;
    transition: var(--transition);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 0;
    background: var(--card-accent, var(--accent));
    opacity: 0.3;
    transition: height 0.4s var(--ease);
}

.project-card:hover {
    background: var(--bg-hover);
    transform: translateX(5px);
    border-color: var(--border-hover);
    border-left-color: var(--card-accent, var(--accent));
    box-shadow: -5px 0 24px rgba(0, 212, 184, 0.07);
}

.project-card[data-category="nlp"]     { --card-accent: var(--accent); }
.project-card[data-category="vision"]  { --card-accent: var(--blue); }
.project-card[data-category="research"]{ --card-accent: var(--green); }
.project-card[data-category="sports"]  { --card-accent: var(--amber); }
.project-card[data-category="industry"]{ --card-accent: var(--rose); }

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--card-accent, var(--accent));
    border: 1px solid var(--card-accent, var(--accent));
    padding: 0.2rem 0.6rem;
    border-radius: 2px;
    opacity: 0.9;
}

.badge-gold {
    color: var(--amber);
    border-color: var(--amber);
}

.project-domain {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.project-card h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.65;
    margin-bottom: 1rem;
}

.project-highlights {
    margin: 0.75rem 0 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.project-highlights li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-left: 1.1rem;
    position: relative;
    line-height: 1.5;
}

.project-highlights li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--card-accent, var(--accent));
    font-weight: 700;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    padding: 0.2rem 0.6rem;
    border-radius: 2px;
    letter-spacing: 0.05em;
    transition: var(--transition);
}

.project-card:hover .tag {
    border-color: var(--border-hover);
    color: var(--text-secondary);
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--card-accent, var(--accent));
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.project-link:hover {
    border-bottom-color: var(--card-accent, var(--accent));
}

/* ========================================
   Skills
   ======================================== */
.skills {
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 1.5rem;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--border-hover);
    background: var(--bg-hover);
}

.skill-category-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.skill-category-header i {
    color: var(--accent);
    font-size: 1rem;
    width: 1.25rem;
    text-align: center;
}

.skill-category-header h3 {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

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

.skill-item {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 400;
    color: var(--text-secondary);
    background: rgba(0, 212, 184, 0.06);
    border: 1px solid rgba(0, 212, 184, 0.15);
    padding: 0.3rem 0.75rem;
    border-radius: 2px;
    letter-spacing: 0.05em;
    transition: var(--transition);
    cursor: default;
}

.skill-item:hover {
    background: rgba(0, 212, 184, 0.14);
    border-color: rgba(0, 212, 184, 0.35);
    color: var(--accent);
    transform: translateY(-2px);
}

/* ========================================
   Contact
   ======================================== */
.contact { background: var(--bg-deep); }

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 4rem;
    max-width: 960px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-item i {
    color: var(--accent);
    font-size: 1rem;
    margin-top: 0.25rem;
    width: 1.25rem;
    text-align: center;
    flex-shrink: 0;
}

.contact-item h4 {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.contact-item a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--accent);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    padding: 0.85rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 2px;
    font-size: 0.92rem;
    font-family: var(--font-body);
    color: var(--text-primary);
    transition: var(--transition);
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg-hover);
    box-shadow: 0 0 0 2px rgba(0, 212, 184, 0.08);
}

.contact-form .btn-primary {
    align-self: flex-start;
    margin-top: 0.25rem;
}

#form-status {
    display: none;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    padding: 0.85rem 1rem;
    border-radius: 2px;
    border-left: 2px solid transparent;
}

#form-status.success {
    display: block;
    background: rgba(52, 211, 153, 0.08);
    border-left-color: var(--green);
    color: var(--green);
}

#form-status.error {
    display: block;
    background: rgba(251, 113, 133, 0.08);
    border-left-color: var(--rose);
    color: var(--rose);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: rgba(0, 0, 0, 0.4);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.footer-copy {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 1.25rem;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: none; }
}

@keyframes scrollDrop {
    0%   { top: -30%; opacity: 0; }
    30%  { opacity: 1; }
    100% { top: 130%; opacity: 0; }
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    .about-highlights {
        padding-top: 0;
    }
    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .hamburger { display: flex; }

    .nav-menu {
        position: fixed;
        top: 0; left: -100%;
        width: 100%; height: 100vh;
        background: rgba(7, 7, 14, 0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        transition: left 0.4s var(--ease);
    }

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

    .nav-link {
        font-size: 0.9rem;
        letter-spacing: 0.2em;
    }

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

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

    .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    section { padding: 4.5rem 0; }
    .hero-title { font-size: 3.2rem; }
    .container { padding: 0 1.25rem; }
}