/* =========================================
   Variables
   ========================================= */
:root {
    --bg:          #0f172a;
    --bg-alt:      #1e293b;
    --surface:     #1e293b;
    --surface-2:   #334155;
    --border:      #334155;
    --text:        #f8fafc;
    --text-muted:  #94a3b8;
    --text-dim:    #64748b;
    --accent:      #4f8ef7;
    --accent-h:    #6ba3ff;
    --trans:       all 0.22s ease;
}

body.light {
    --bg:         #ffffff;
    --bg-alt:     #f5f5f5;
    --surface:    #f0f0f0;
    --surface-2:  #e5e5e5;
    --border:     #dddddd;
    --text:       #111111;
    --text-muted: #666666;
    --text-dim:   #aaaaaa;
}

/* =========================================
   Reset
   ========================================= */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
}

/* Hero canvas — inside the hero section only */
#hero-canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* All content must sit above the canvas */
.navbar, main, footer { position: relative; z-index: 1; }

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* =========================================
   Layout helpers
   ========================================= */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border);
}

.section:last-of-type { border-bottom: none; }

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 0 80px;
    overflow: hidden;
    background: var(--bg);
}

.hero-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* =========================================
   Navbar
   ========================================= */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 999;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

body.light .navbar {
    background: rgba(255,255,255,0.9);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    transition: var(--trans);
    opacity: 0.9;
}

.nav-logo:hover { opacity: 1; }

.nav-logo svg path { transition: var(--trans); }

body.light .nav-logo svg path { fill: #111111; }

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--trans);
}

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

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

.icon-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--trans);
    display: flex; align-items: center; justify-content: center;
    padding: 4px;
}
.icon-btn:hover { color: var(--text); }

.text-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    transition: var(--trans);
    letter-spacing: 0.04em;
}
.text-btn:hover { color: var(--text); border-color: var(--text-muted); }

.mobile-only { display: none; }

/* Mobile menu */
.mobile-menu {
    display: none;
    flex-direction: column;
    padding: 12px 40px 20px;
    gap: 14px;
    border-top: 1px solid var(--border);
}
.mobile-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
}
.mobile-menu a:hover { color: var(--text); }
.mobile-menu.open { display: flex; }

/* =========================================
   Section Header
   ========================================= */
.section-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.divider {
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* =========================================
   Hero
   ========================================= */
.eyebrow {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 16px;
}

.hero-name {
    font-size: clamp(2.4rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 14px;
}

.hero-role {
    font-size: 1.2rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 20px;
    min-height: 1.8em;
}

.typed-cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 560px;
    line-height: 1.75;
    margin-bottom: 36px;
}

.hero-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 44px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 8px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    border: none;
    transition: var(--trans);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}
@media (hover: hover) {
    .btn-primary:hover {
        background: var(--accent-h);
        transform: translateY(-2px);
        box-shadow: 0 4px 20px rgba(79,142,247,0.35);
    }
}
.btn-primary:active {
    transform: translateY(0);
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}
@media (hover: hover) {
    .btn-ghost:hover {
        border-color: var(--text-muted);
        color: var(--text);
        transform: translateY(-2px);
    }
}
.btn-ghost:active {
    transform: translateY(0);
}

/* Social icons */
.socials {
    display: flex;
    gap: 14px;
}

.socials a {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    transition: var(--trans);
}
.socials a:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* =========================================
   About
   ========================================= */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 48px;
    align-items: start;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.8;
}

/* Edu card */
.edu-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
}

.edu-icon {
    width: 42px;
    height: 42px;
    background: rgba(79,142,247,0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.edu-uni   { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.edu-dept  { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 3px; }
.edu-period{ font-size: 0.82rem; color: var(--accent); font-weight: 600; }

/* =========================================
   Skills
   ========================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.skill-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 20px;
    transition: var(--trans);
}

.skill-card:hover {
    border-color: rgba(79,142,247,0.4);
    background: var(--surface-2);
}

.skill-icon {
    color: var(--accent);
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.skill-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text);
}

.skill-card ul {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.skill-card ul li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-left: 10px;
    position: relative;
}

.skill-card ul li::before {
    content: '—';
    position: absolute;
    left: -4px;
    color: var(--text-dim);
    font-size: 0.75rem;
}

/* =========================================
   Projects — 3 columns
   ========================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.proj-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: var(--trans);
}

.proj-card:hover {
    border-color: rgba(79,142,247,0.45);
    background: var(--surface-2);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.4);
}

.proj-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.proj-tag {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
}

.proj-arrow {
    font-size: 0.8rem;
    color: var(--text-dim);
    transition: var(--trans);
}
.proj-card:hover .proj-arrow { color: var(--accent); }

.proj-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.4;
}

.proj-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.7;
    flex: 1;
}

.proj-techs {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 4px;
}

.proj-techs span {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 5px;
    background: var(--bg-alt);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* =========================================
   Contact — Minimal
   ========================================= */
.contact-minimal {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px 8px;
}

.cmin-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--trans);
    padding: 6px 2px;
}

.cmin-link i { font-size: 0.9rem; }

.cmin-link:hover { color: var(--accent); }

.cmin-sep {
    color: var(--text-dim);
    font-size: 1.2rem;
    line-height: 1;
    select-user: none;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
    text-align: left;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.clink {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: var(--trans);
}
.clink:hover {
    border-color: var(--accent);
    background: var(--surface-2);
}

.clink-icon {
    width: 36px;
    height: 36px;
    background: rgba(79,142,247,0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.clink-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-dim);
    font-weight: 700;
    margin-bottom: 2px;
}

.clink-val {
    font-size: 0.88rem;
    color: var(--text);
    font-weight: 500;
}

/* Contact form */
.contact-form {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 11px 14px;
    font-size: 0.9rem;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    outline: none;
    transition: var(--trans);
    resize: vertical;
}

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

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79,142,247,0.1);
}

/* =========================================
   Footer
   ========================================= */
.footer {
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 28px 0;
}

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

.footer p {
    font-size: 0.85rem;
    color: var(--text-dim);
}

.footer-socials {
    display: flex;
    gap: 14px;
}

.footer-socials a {
    color: var(--text-dim);
    font-size: 1rem;
    transition: var(--trans);
}
.footer-socials a:hover { color: var(--accent); }

/* =========================================
   Animations
   ========================================= */
.animate-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-up.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 1100px) {
    .skills-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid  { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid  { grid-template-columns: 1fr; }
    .nav-links     { display: none; }
    .mobile-only   { display: flex; }
}

@media (max-width: 600px) {
    .container     { padding: 0 20px; }
    .nav-container { padding: 0 20px; }
    .mobile-menu   { padding: 12px 20px 20px; }
    .projects-grid { grid-template-columns: 1fr; }
    .skills-grid   { grid-template-columns: 1fr; }
    .form-row      { grid-template-columns: 1fr; }
    .hero-btns     { flex-direction: column; }
    .btn           { width: 100%; justify-content: center; }
    .footer-inner  { flex-direction: column; gap: 14px; text-align: center; }

    .form-group input,
    .form-group textarea {
        font-size: 16px; /* Prevents iOS Safari zoom */
    }
}