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

:root {
    --bg: #08080c;
    --bg-nav: rgba(8, 8, 12, 0.85);
    --text: #d0d0d8;
    --text-heading: #fff;
    --dim: #555568;
    --accent: #7c6ff7;
    --border: rgba(255, 255, 255, 0.05);
    --tag-hover-border: rgba(124, 111, 247, 0.3);
}

[data-theme="light"] {
    --bg: #f5f5f7;
    --bg-nav: rgba(245, 245, 247, 0.85);
    --text: #2a2a32;
    --text-heading: #111118;
    --dim: #7a7a8c;
    --accent: #5b4fd6;
    --border: rgba(0, 0, 0, 0.08);
    --tag-hover-border: rgba(91, 79, 214, 0.3);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.dim { color: var(--dim); font-weight: 400; }

/* NAV */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    padding: 1.5rem 3rem;
    background: var(--bg-nav);
    backdrop-filter: blur(24px);
    transition: background 0.3s;
}

.nav__logo {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    letter-spacing: 2px;
    color: var(--dim);
    transition: color 0.3s;
}

.nav__logo:hover { color: var(--text); }

.nav__links {
    display: flex;
    gap: 2.5rem;
}

.nav__links a {
    font-size: 0.8rem;
    color: var(--dim);
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.3s;
}

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

.nav__burger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav__burger span {
    display: block;
    width: 20px;
    height: 1px;
    background: var(--dim);
    transition: background 0.3s;
}

/* THEME TOGGLE */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.3s;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

.theme-toggle svg {
    width: 16px;
    height: 16px;
    stroke: var(--dim);
    fill: none;
    stroke-width: 1.5;
    transition: stroke 0.3s;
}

.theme-toggle:hover svg {
    stroke: var(--accent);
}

.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }

[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* HERO (index) */
.hero {
    position: relative;
    z-index: 1;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 3rem;
    max-width: 720px;
    margin: 0 auto;
    overflow: hidden;
}

.hero__name {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 300;
    letter-spacing: -1px;
    line-height: 1.15;
    color: var(--text-heading);
}

.hero__title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--accent);
    margin-top: 0.75rem;
    letter-spacing: 1px;
}

.hero__desc {
    color: var(--dim);
    margin-top: 1.5rem;
    max-width: 500px;
    font-size: 1rem;
}

.hero__links {
    display: flex;
    gap: 1rem;
    margin-top: 2.5rem;
}

.btn {
    display: inline-block;
    padding: 0.7rem 2rem;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: border-color 0.3s, color 0.3s;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--text-heading);
}

/* PAGE LAYOUT (subpages) */
.page {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin: 0 auto;
    padding: 8rem 3rem 3rem;
}

.page--wide {
    max-width: 1100px;
}

.page__title {
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--dim);
    margin-bottom: 3rem;
}

.page__desc {
    color: var(--dim);
    margin-top: -2rem;
    margin-bottom: 3rem;
}

/* BLOCKS */
.block {
    margin-bottom: 4rem;
}

.block__heading {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

/* EXPERIENCE */
.exp__item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
}

.exp__item:last-child {
    border-bottom: 1px solid var(--border);
}

.exp__date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--dim);
    padding-top: 0.15rem;
}

.exp__body h3 {
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.5;
}

.exp__body p {
    color: var(--dim);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}

.tags span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--dim);
    padding: 0.2rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 3px;
    transition: border-color 0.3s, color 0.3s;
}

.tags span:hover {
    border-color: var(--tag-hover-border);
    color: var(--accent);
}

/* RESUME TWO-COLUMN */
.resume-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 4rem;
    align-items: start;
}

.resume-left {
    position: sticky;
    top: 6rem;
}

.exp__item--flat {
    display: block;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
}

.exp__item--flat:last-child {
    border-bottom: 1px solid var(--border);
}

.exp__item--flat .exp__date {
    display: block;
    margin-bottom: 0.4rem;
}

.exp__item--flat h3 {
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.5;
}

.exp__item--flat p {
    color: var(--dim);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* SKILLS */
.skills-grid {
    display: grid;
    gap: 2.5rem;
}

.skills__heading {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.75rem;
}

/* PROJECTS */
.projects {
    display: grid;
    gap: 1px;
}

.project {
    display: block;
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}

.project:last-child {
    border-bottom: 1px solid var(--border);
}

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

.project__top h3 {
    font-size: 1.1rem;
    font-weight: 500;
}

.project__arrow {
    color: var(--dim);
    font-size: 1.2rem;
    transition: color 0.3s, transform 0.3s;
}

.project:hover .project__arrow {
    color: var(--accent);
    transform: translateX(4px);
}

.project p {
    color: var(--dim);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    max-width: 500px;
}

.project__url {
    display: inline-block;
    margin-top: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
}

/* CONTACTS */
.contacts {
    display: grid;
    gap: 1px;
}

.contact-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
    border-top: 1px solid var(--border);
}

.contact-row:last-child {
    border-bottom: 1px solid var(--border);
}

.contact-row__label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--dim);
}

.contact-row__value {
    font-size: 0.9rem;
    color: var(--text);
    transition: color 0.3s;
}

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

/* FOOTER */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    font-size: 0.75rem;
    color: var(--dim);
}

/* ANIMATIONS */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* RESPONSIVE */
@media (max-width: 640px) {
    .nav { padding: 1.2rem 1.5rem; gap: 1.5rem; }
    .nav__links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-nav);
        backdrop-filter: blur(24px);
        padding: 1.5rem;
        gap: 1rem;
    }
    .nav__links.open { display: flex; }
    .nav__burger { display: flex; }
    .hero { padding: 0 1.5rem; }
    .page { padding: 7rem 1.5rem 3rem; }
    .exp__item {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }
    .resume-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .resume-left {
        position: static;
    }
    .contact-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
    .hero__links { flex-direction: column; gap: 0.75rem; }
    .hero__links .btn { text-align: center; }
}