/* ============================================================
   Tokens
   ============================================================ */
:root {
    --black: #000000;
    --white: #ffffff;
    --ink: rgba(255, 255, 255, 0.92);
    --ink-muted: rgba(255, 255, 255, 0.6);
    --ink-faint: rgba(255, 255, 255, 0.38);
    --line: rgba(255, 255, 255, 0.18);
    --line-strong: rgba(255, 255, 255, 0.4);
    --surface: rgba(255, 255, 255, 0.04);
    --surface-hover: rgba(255, 255, 255, 0.07);
    --error: #ffffff;

    --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --container: 1180px;
    --gutter: clamp(1.25rem, 4vw, 3rem);
    --section-y: clamp(4.5rem, 10vw, 7.5rem);

    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-base: 0.3s;
}

/* ============================================================
   Reset & base
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-mono);
    font-size: 16px;
    line-height: 1.7;
    color: var(--ink);
    background-color: var(--black);
    transition: background-color 1.1s var(--ease-out-expo);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gutter);
}

h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.1;
    text-wrap: balance;
}

p {
    max-width: 68ch;
}

a {
    color: var(--ink);
}

::selection {
    background: var(--white);
    color: var(--black);
}

/* faint scanline / CRT texture overlay */
.scanlines {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 2;
    opacity: 0.05;
    background-image: repeating-linear-gradient(
        to bottom,
        var(--white) 0px,
        var(--white) 1px,
        transparent 1px,
        transparent 3px
    );
    mix-blend-mode: overlay;
}

/* ambient stage-light glows — drift slowly across the page as you scroll,
   giving the flat black canvas the same soft 3D depth as the hero terminal */
.stage-lights {
    position: fixed;
    inset: 0;
    z-index: 1;
    overflow: hidden;
    pointer-events: none;
}

.stage-light {
    position: absolute;
    width: 64vmax;
    height: 64vmax;
    border-radius: 50%;
    filter: blur(130px);
    opacity: 1;
    will-change: opacity, transform;
    transition: opacity 0.5s var(--ease-out-expo);
}

.stage-light--hidden {
    opacity: 0;
}

.stage-light--a {
    top: -28vmax;
    left: -22vmax;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 70%);
}

.stage-light--b {
    bottom: -32vmax;
    right: -26vmax;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.085), transparent 70%);
}

.stage-light--c {
    top: 32vmax;
    left: 28vmax;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.06), transparent 70%);
}

@media (prefers-reduced-motion: reduce) {
    .stage-light {
        transition: none !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================================
   Section scaffolding
   ============================================================ */
section {
    padding: var(--section-y) 0;
}

.section-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    color: var(--ink-faint);
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 2.5rem;
}

.section-description {
    color: var(--ink-muted);
    margin-top: -1.5rem;
    margin-bottom: 2.5rem;
}

.section-description a {
    text-decoration: underline;
    text-underline-offset: 3px;
    color: var(--ink);
}

.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
    transition-delay: calc(var(--reveal-i, 0) * 90ms);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Navigation
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.1rem var(--gutter);
    max-width: var(--container);
    margin: 0 auto;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--ink);
    text-decoration: none;
}

.nav-logo__dim {
    color: var(--ink-faint);
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--ink-muted);
    text-decoration: none;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
    transition: color var(--duration-base) ease;
    position: relative;
}

.nav-link__index {
    color: var(--ink-faint);
    margin-right: 0.4em;
    font-size: 0.8em;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 1px;
    background: var(--ink);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--duration-base) var(--ease-out-expo);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

/* mobile navigation */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0.5rem;
}

.bar {
    display: block;
    width: 22px;
    height: 1px;
    background-color: var(--ink);
    transition: transform 0.3s var(--ease-out-expo), opacity 0.3s ease;
}

.hamburger.active .bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* ============================================================
   Hero / terminal
   ============================================================ */
.hero {
    padding: clamp(7rem, 16vw, 10rem) 0 clamp(4rem, 10vw, 6rem);
    min-height: 100dvh;
    display: flex;
    align-items: center;
}

.hero-container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gutter);
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.terminal-stage {
    position: relative;
    z-index: 0;
    width: 100%;
    max-width: 760px;
}

/* Fills the terminal's full rectangle from behind it — the terminal's
   own surface masks the body of the glow, so only a soft halo bleeds
   out past its edges. That boundary never sits still: each corner's
   curve drifts independently, so the rectangle's outline ripples and
   undulates like the surface of a liquid held in its shape. */
.terminal-glow {
    position: absolute;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: rgba(255, 255, 255, 0.18);
    filter: blur(40px);
    animation: ooze-edges 19s ease-in-out infinite alternate;
}

@keyframes ooze-edges {
    0% {
        border-radius: 6% 16% 10% 18% / 14% 8% 18% 10%;
    }
    25% {
        border-radius: 18% 8% 16% 6% / 8% 18% 10% 16%;
    }
    50% {
        border-radius: 12% 18% 6% 14% / 18% 10% 14% 6%;
    }
    75% {
        border-radius: 16% 6% 18% 10% / 10% 16% 6% 18%;
    }
    100% {
        border-radius: 6% 16% 10% 18% / 14% 8% 18% 10%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .terminal-glow {
        animation: none;
    }
}

.terminal {
    position: relative;
    z-index: 1;
    border: 1px solid var(--line);
    background: var(--surface);
    width: 100%;
    max-width: 760px;
}

.terminal__chrome {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 0.7rem 1rem;
    border-bottom: 1px solid var(--line);
}

.terminal__dots {
    display: flex;
    gap: 6px;
}

.terminal__dots span {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1px solid var(--line-strong);
}

.terminal__path {
    font-size: 0.78rem;
    color: var(--ink-faint);
    letter-spacing: 0.02em;
}

.terminal__body {
    padding: 1.5rem;
    font-size: clamp(0.85rem, 1.6vw, 1rem);
}

.terminal__line {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6em;
    align-items: baseline;
    min-height: 1.7em;
    color: var(--ink);
}

.terminal__line--out {
    color: var(--ink-muted);
    padding-left: 0;
}

.terminal__line--out .type[data-strong="true"] {
    color: var(--ink);
    font-weight: 600;
    font-size: 1.15em;
}

.terminal__prompt {
    color: var(--ink-faint);
    white-space: nowrap;
}

.terminal__cursor {
    display: inline-block;
    color: var(--ink);
    animation: blink 1s steps(1) infinite;
}

@keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

.type::after {
    content: '';
}

.type.is-typing::after {
    content: '▌';
    display: inline-block;
    margin-left: 1px;
    animation: blink 1s steps(1) infinite;
}

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

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    padding: 0.85rem 1.6rem;
    border: 1px solid var(--line-strong);
    border-radius: 0;
    text-decoration: none;
    cursor: pointer;
    background: transparent;
    color: var(--ink);
    transition: background var(--duration-base) var(--ease-out-expo),
                color var(--duration-base) var(--ease-out-expo),
                border-color var(--duration-base) var(--ease-out-expo),
                transform var(--duration-base) var(--ease-out-expo);
}

.btn::before {
    content: '> ';
    color: var(--ink-faint);
    transition: color var(--duration-base) ease;
}

.btn-primary {
    background: var(--white);
    color: var(--black);
    border-color: var(--white);
}

.btn-primary::before {
    color: var(--black);
    opacity: 0.5;
}

.btn-primary:hover {
    background: transparent;
    color: var(--ink);
    border-color: var(--line-strong);
    transform: translateY(-2px);
}

.btn-primary:hover::before {
    color: var(--ink-faint);
}

.btn-secondary {
    color: var(--ink);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--black);
    border-color: var(--white);
    transform: translateY(-2px);
}

.btn-secondary:hover::before {
    color: var(--black);
    opacity: 0.5;
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

.btn:focus-visible {
    outline: 1px solid var(--white);
    outline-offset: 3px;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.btn-spinner {
    width: 12px;
    height: 12px;
    border: 1px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================================
   About
   ============================================================ */
.about-content {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: clamp(2.5rem, 6vw, 5rem);
}

.about-text p {
    color: var(--ink-muted);
    margin-bottom: 1.25rem;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.skills__heading {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.06em;
    color: var(--ink-faint);
    font-weight: 500;
    margin-bottom: 1.25rem;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.skill-tag {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--line);
    color: var(--ink-muted);
    transition: border-color var(--duration-base) ease, color var(--duration-base) ease;
}

.skill-tag:hover {
    border-color: var(--line-strong);
    color: var(--ink);
}

/* ============================================================
   Research / Experience timeline
   ============================================================ */
.timeline {
    list-style: none;
    display: flex;
    flex-direction: column;
}

.timeline__entry {
    display: grid;
    grid-template-columns: 11rem 1fr;
    gap: clamp(1.5rem, 4vw, 3rem);
    padding: 2rem 0;
    border-top: 1px solid var(--line);
}

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

.timeline__when {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--ink-faint);
    letter-spacing: 0.02em;
    padding-top: 0.2rem;
}

.timeline__title {
    font-size: clamp(1.1rem, 2.4vw, 1.4rem);
    margin-bottom: 0.6rem;
}

.timeline__detail {
    color: var(--ink-muted);
    margin-bottom: 1rem;
}

.timeline__tag {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-faint);
    letter-spacing: 0.02em;
}

/* ============================================================
   Projects
   ============================================================ */
.project-controls {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 3rem;
}

.search-container {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    border: 1px solid var(--line);
    padding: 0.75rem 1rem;
    max-width: 420px;
}

.search-prefix {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--ink-faint);
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--ink);
}

.search-input::placeholder {
    color: var(--ink-faint);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    padding: 0.5rem 1rem;
    border: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    color: var(--ink-muted);
    cursor: pointer;
    transition: border-color var(--duration-base) ease, color var(--duration-base) ease, background var(--duration-base) ease;
}

.filter-btn:hover {
    border-color: var(--line-strong);
    color: var(--ink);
}

.filter-btn.active {
    background: var(--white);
    border-color: var(--white);
    color: var(--black);
}

.loading-state,
.error-state,
.empty-state {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--ink-muted);
    font-size: 0.9rem;
    padding: 2rem 0;
}

.loading-state__cursor {
    animation: blink 1s steps(1) infinite;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.project-card {
    background: var(--black);
    padding: 1.75rem;
    transition: background var(--duration-base) ease;
}

.project-card:hover {
    background: var(--surface);
}

.project-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.25rem;
    cursor: pointer;
}

.project-image {
    display: none;
}

.project-header-content {
    flex: 1;
    min-width: 0;
}

.project-title {
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    margin-bottom: 0.6rem;
}

.project-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-category-badge {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--ink-faint);
    border: 1px solid var(--line);
    padding: 0.2rem 0.55rem;
}

.project-expand-btn {
    background: none;
    border: 1px solid var(--line);
    color: var(--ink-muted);
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--duration-base) ease, color var(--duration-base) ease;
}

.project-expand-btn:hover {
    border-color: var(--line-strong);
    color: var(--ink);
}

.expand-icon {
    display: inline-block;
    font-size: 0.7rem;
    transition: transform var(--duration-base) var(--ease-out-expo);
}

.project-content {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.4s var(--ease-out-expo), opacity 0.3s ease, margin-top 0.4s ease;
}

.project-card.expanded .project-content {
    max-height: 600px;
    opacity: 1;
    margin-top: 1.25rem;
}

.project-description {
    color: var(--ink-muted);
    margin-bottom: 1.25rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--ink-faint);
    border: 1px solid var(--line);
    padding: 0.25rem 0.6rem;
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--line-strong);
    padding-bottom: 2px;
    transition: opacity var(--duration-base) ease;
}

.project-link:hover {
    opacity: 0.7;
}

.external-icon {
    font-size: 0.8rem;
}

/* ============================================================
   GitHub repos
   ============================================================ */
.github-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.repo-card {
    display: block;
    background: var(--black);
    padding: 1.5rem;
    text-decoration: none;
    color: var(--ink);
    transition: background var(--duration-base) ease;
}

.repo-card:hover {
    background: var(--surface);
}

.project-card.reveal,
.repo-card.reveal {
    transition: background var(--duration-base) ease,
                opacity 0.8s var(--ease-out-expo),
                transform 0.8s var(--ease-out-expo);
    transition-delay: 0ms, calc(var(--reveal-i, 0) * 90ms), calc(var(--reveal-i, 0) * 90ms);
}

.repo-header {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
}

.repo-icon {
    display: none;
}

.repo-name {
    font-size: 1.05rem;
    word-break: break-word;
}

.repo-description {
    color: var(--ink-muted);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
}

.repo-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-faint);
}

.repo-stat {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.language-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
    border: 1px solid var(--line-strong);
}

/* ============================================================
   Contact
   ============================================================ */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: clamp(2.5rem, 6vw, 5rem);
}

.contact-info p {
    color: var(--ink-muted);
    margin-bottom: 2rem;
}

.contact-details {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.contact-item {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    font-size: 0.95rem;
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    color: var(--ink-faint);
    width: 4.5em;
    flex-shrink: 0;
}

.contact-item a {
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--line);
    transition: border-color var(--duration-base) ease;
}

.contact-item a:hover {
    border-color: var(--line-strong);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.form-group label {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    color: var(--ink-faint);
}

.form-group input,
.form-group textarea {
    background: transparent;
    border: 1px solid var(--line);
    border-radius: 0;
    padding: 0.85rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--ink);
    outline: none;
    transition: border-color var(--duration-base) ease;
    resize: vertical;
}

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

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--white);
}

.form-group input.is-invalid,
.form-group textarea.is-invalid {
    border-color: var(--ink);
    border-style: dashed;
}

.error-message {
    font-size: 0.8rem;
    color: var(--ink-muted);
    min-height: 1.2em;
}

.success-message {
    font-size: 0.85rem;
    color: var(--ink-muted);
    border: 1px solid var(--line);
    padding: 0.85rem 1rem;
}

#submit-btn {
    align-self: flex-start;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
    padding: 2.5rem 0;
}

.footer__inner {
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer-copyright {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--ink-faint);
    margin: 0;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 860px) {
    .nav-menu {
        position: fixed;
        inset: 60px 0 0 0;
        height: calc(100dvh - 60px);
        width: 100%;
        background: var(--black);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 2.5rem var(--gutter);
        gap: 1.75rem;
        transform: translateX(100%);
        transition: transform 0.35s var(--ease-out-expo);
    }

    .nav-menu .nav-link {
        font-size: 1.4rem;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .hamburger {
        display: flex;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .timeline__entry {
        grid-template-columns: 1fr;
        gap: 0.6rem;
    }
}

@media (max-width: 540px) {
    .terminal__body {
        font-size: 0.78rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-buttons {
        gap: 0.5rem;
    }
}