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

:root {
    --bg: #0a0a0f;
    --bg-alt: #111118;
    --surface: #1a1a24;
    --border: #2a2a3a;
    --text: #e4e4ed;
    --text-muted: #9494a8;
    --accent: #6c63ff;
    --accent-hover: #847dff;
    --accent-glow: rgba(108, 99, 255, 0.15);
    --success: #34d399;
    --radius: 12px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover { color: var(--accent-hover); }

img { max-width: 100%; height: auto; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition);
}
.navbar.scrolled {
    border-bottom-color: var(--border);
    background: rgba(10, 10, 15, 0.95);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}
.nav-brand:hover { color: var(--text); }
.nav-logo {
    height: 32px;
    width: auto;
}

.accent { color: var(--accent); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}
.nav-links a {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}
.nav-links a:hover {
    color: var(--text);
    background: var(--accent-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}
.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: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover {
    background: var(--accent-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 64px;
    background:
        linear-gradient(135deg, rgba(10, 10, 15, 0.92) 0%, rgba(10, 10, 15, 0.75) 100%),
        url('../images/slider-bg.jpg') center/cover no-repeat fixed;
}
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, var(--accent-glow) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(52, 211, 153, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content { max-width: 700px; position: relative; z-index: 1; }

.hero-tag {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1.5px;
    margin-bottom: 1.25rem;
}

.hero-sub {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===== Sections ===== */
.section {
    padding: 6rem 0;
}
.section-alt {
    background: var(--bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}
.section-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}
.section-sub {
    color: var(--text-muted);
    font-size: 1.0625rem;
}

/* ===== Cards ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}
.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}
.card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.card p {
    color: var(--text-muted);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* ===== Subsection titles ===== */
.subsection-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 3rem 0 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
}
.subsection-small {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin: 2rem 0 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== Project Cards ===== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}
.project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: border-color var(--transition);
}
.project-card:hover { border-color: var(--accent); }
.project-card.featured { border-left: 3px solid var(--accent); }
.project-card h4 {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.project-card p {
    color: var(--text-muted);
    font-size: 0.9375rem;
}
.project-meta {
    font-size: 0.8125rem !important;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

/* ===== Link List ===== */
.link-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.link-list a {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: border-color var(--transition), background var(--transition);
}
.link-list a:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}
.link-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text);
}
.link-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
}
.press-intro {
    color: var(--text-muted);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
}

/* ===== Gallery Filter ===== */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}
.filter-btn {
    padding: 0.4rem 0.85rem;
    font-family: var(--font);
    font-size: 0.8125rem;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: 100px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
}
.gallery-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
    overflow: hidden;
}
.gallery-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.gallery-item.hidden {
    display: none;
}
.gallery-item img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    transition: opacity var(--transition), transform var(--transition);
}
.gallery-item:hover img { opacity: 0.85; transform: scale(1.03); }
.gallery-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-muted);
}
.gallery-item a { color: var(--text); }
.gallery-item a:hover .gallery-label { color: var(--accent); }

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}
.skill-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
}
.skill-block h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent);
}
.skill-block ul {
    list-style: none;
}
.skill-block li {
    padding: 0.3rem 0;
    font-size: 0.9375rem;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(42, 42, 58, 0.5);
}
.skill-block li:last-child { border-bottom: none; }

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 3rem;
}
.tag {
    padding: 0.35rem 0.85rem;
    font-size: 0.8125rem;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--text-muted);
    background: var(--surface);
}

.profile-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.portfolio-links {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1rem;
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 2rem;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}
.timeline-item {
    position: relative;
    padding-bottom: 2.5rem;
    transition: transform var(--transition);
}
.timeline-item:hover {
    transform: translateX(4px);
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.35rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-alt);
    transform: translateX(-5px);
}
.timeline-date {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.35rem;
    letter-spacing: 0.5px;
}
.timeline-content h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.timeline-content p {
    color: var(--text-muted);
    font-size: 0.9375rem;
}

/* ===== Learning ===== */
.learning-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.75rem;
}
.learning-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    font-size: 0.9375rem;
    color: var(--text-muted);
}

/* ===== About ===== */
.about-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    align-items: start;
}
.about-photo img {
    width: 100%;
    border-radius: var(--radius);
    border: 3px solid var(--border);
    transition: border-color var(--transition);
}
.about-photo img:hover {
    border-color: var(--accent);
}
.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}
.about-list {
    list-style: none;
    margin-bottom: 2rem;
}
.about-list li {
    padding: 0.4rem 0;
    font-size: 0.9375rem;
    color: var(--text-muted);
    padding-left: 1.25rem;
    position: relative;
}
.about-list li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

/* ===== Contact ===== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    font-family: var(--font);
    font-size: 0.9375rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    transition: border-color var(--transition);
}
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--text-muted);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.form-group { margin-bottom: 1rem; }

.contact-block {
    margin-bottom: 2rem;
}
.contact-block h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.contact-block p {
    color: var(--text-muted);
    font-size: 0.9375rem;
    line-height: 1.8;
}
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.social-links a {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all var(--transition);
}
.social-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ===== Footer ===== */
.footer {
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
    background: var(--bg-alt);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ===== Selection ===== */
::selection { background: var(--accent); color: #fff; }

/* ===== Animations ===== */
/* Only hide elements when JS is confirmed available */
html:not(.no-js) .fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
html:not(.no-js) .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}
/* If JS fails, content stays fully visible */
html.no-js .fade-in {
    opacity: 1;
    transform: none;
}

/* ===== Mobile ===== */
@media (max-width: 768px) {
    .nav-toggle { display: flex; }

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        padding: 1rem;
        border-bottom: 1px solid var(--border);
        gap: 0;
    }
    .nav-links.open { display: flex; }
    .nav-links a {
        padding: 0.75rem 1rem;
        width: 100%;
    }

    .hero h1 { font-size: 2.25rem; }

    .section { padding: 4rem 0; }
    .section-header h2 { font-size: 1.75rem; }

    .about-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .about-photo { max-width: 200px; margin: 0 auto; }
    .about-list li { text-align: left; }

    .contact-layout { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }

    .timeline { padding-left: 1.5rem; }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .portfolio-links {
        display: flex;
        gap: 0.5rem;
        justify-content: center;
        margin-top: 1rem;
    }

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

@media (max-width: 480px) {
    .hero h1 { font-size: 1.875rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; justify-content: center; }
    .card-grid { grid-template-columns: 1fr; }
    .project-grid { grid-template-columns: 1fr; }
}