html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============ Design tokens ============ */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --radius: 14px;
    --shadow-soft: 0 10px 30px -12px rgba(15, 23, 42, .15);

    /* Light theme (default) */
    --bg: #f3f1f8;
    --surface: #ffffff;
    --surface-2: #eeecf6;
    --border: rgba(76, 29, 149, .12);
    --text: #1a1523;
    --text-muted: #5c5570;
    --accent: #7c3aed;
    --accent-2: #4c1d95;
    --accent-rgb: 124, 58, 237;
    --accent-soft: rgba(124, 58, 237, .12);
    --glass-bg: rgba(255, 255, 255, .55);
    --glass-border: rgba(255, 255, 255, .65);
    --glass-shadow: 0 20px 50px -28px rgba(30, 15, 70, .35), inset 0 1px 0 rgba(255, 255, 255, .85), inset 0 0 0 1px rgba(255, 255, 255, .35);
}

body.theme-dark {
    --bg: #0b0812;
    --surface: #15111f;
    --surface-2: #1b1728;
    --border: rgba(255, 255, 255, .1);
    --text: #ece9f5;
    --text-muted: #9b93b0;
    --accent: #a78bfa;
    --accent-2: #7c3aed;
    --accent-rgb: 167, 139, 250;
    --accent-soft: rgba(167, 139, 250, .16);
    --shadow-soft: 0 10px 30px -12px rgba(0, 0, 0, .55);
    --glass-bg: rgba(255, 255, 255, .055);
    --glass-border: rgba(255, 255, 255, .14);
    --glass-shadow: 0 20px 60px -22px rgba(0, 0, 0, .65), inset 0 1px 0 rgba(255, 255, 255, .16), inset 0 0 0 1px rgba(255, 255, 255, .05);
}

body {
    font-family: var(--font-sans);
    padding-top: 70px;
    background: var(--bg);
    color: var(--text);
    transition: background .2s ease, color .2s ease;
    min-height: 100vh;
}

/* Liquid mesh background — anchored to the viewport so every glass
   panel down the page blurs the same soft color field behind it.
   A slow drift keeps it feeling alive without being distracting. */
body.theme-dark {
    background:
        radial-gradient(ellipse 70% 45% at 15% -8%, rgba(124, 58, 237, .38), transparent 60%),
        radial-gradient(ellipse 55% 45% at 92% 8%, rgba(76, 29, 149, .4), transparent 62%),
        radial-gradient(ellipse 60% 45% at 30% 105%, rgba(124, 58, 237, .16), transparent 60%),
        var(--bg);
    background-size: 180% 180%;
    background-attachment: fixed;
    animation: mesh-drift 26s ease-in-out infinite alternate;
}

body:not(.theme-dark) {
    background:
        radial-gradient(ellipse 70% 45% at 12% -8%, rgba(124, 58, 237, .14), transparent 60%),
        radial-gradient(ellipse 55% 45% at 95% 5%, rgba(76, 29, 149, .1), transparent 62%),
        var(--bg);
    background-size: 180% 180%;
    background-attachment: fixed;
    animation: mesh-drift 26s ease-in-out infinite alternate;
}

@keyframes mesh-drift {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 55%; }
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -.02em;
}

.text-muted {
    color: var(--text-muted) !important;
}

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

a:hover {
    color: var(--accent-2);
}

code {
    font-family: var(--font-mono);
    color: var(--accent);
    background: var(--accent-soft);
    padding: .1em .35em;
    border-radius: 5px;
}

/* ============ Navbar (always dark, glassy) ============ */
.navbar.bg-dark {
    background: rgba(13, 9, 24, .78) !important;
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    backdrop-filter: blur(20px) saturate(160%);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.brand {
    font-weight: 800;
    letter-spacing: .3px;
    background: linear-gradient(90deg, #ffffff, #c4b5fd 140%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, .65) !important;
    font-weight: 500;
    position: relative;
    padding-top: .65rem;
    padding-bottom: .65rem;
    transition: color .15s ease;
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-item.active .nav-link {
    color: #ffffff !important;
}

.navbar-dark .navbar-nav .nav-item.active .nav-link::after,
.navbar-dark .navbar-nav .nav-item .nav-link:hover::after {
    content: "";
    position: absolute;
    left: .9rem;
    right: .9rem;
    bottom: 2px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, #2dd4bf, #818cf8);
}

.nav-icon-link {
    font-size: 1.05rem;
}

/* ============ Hero ============ */
.hero {
    position: relative;
    padding: 4.5rem 1.75rem 3.5rem;
    border-radius: 32px;
    overflow: hidden;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    -webkit-backdrop-filter: blur(30px) saturate(160%);
    backdrop-filter: blur(30px) saturate(160%);
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 44px 44px;
    opacity: .5;
    -webkit-mask-image: radial-gradient(ellipse at center, black 35%, transparent 78%);
    mask-image: radial-gradient(ellipse at center, black 35%, transparent 78%);
    pointer-events: none;
}

.hero > * {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.1rem;
}

@media (min-width: 992px) {
    .hero-title {
        font-size: 2.7rem;
    }
}

.hero-cta .btn {
    margin: .3rem .5rem .3rem 0;
}

/* Hero visual: animated equity-curve chart + validation terminal —
   the site's signature ML/quant motif */
.hero-visual {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    backdrop-filter: blur(24px) saturate(160%);
    border-radius: 22px;
    padding: 1.5rem;
}

.hero-chart {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 1.15rem;
}

.chart-line {
    fill: none;
    stroke: var(--accent);
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    filter: drop-shadow(0 0 8px rgba(var(--accent-rgb), .55));
    stroke-dasharray: 640;
    stroke-dashoffset: 640;
    animation: draw-line 2.2s .3s cubic-bezier(.16, .8, .3, 1) forwards;
}

@keyframes draw-line {
    to { stroke-dashoffset: 0; }
}

.chart-dot {
    fill: var(--accent);
    opacity: 0;
    transform-origin: center;
    animation: dot-in .4s ease-out forwards var(--dd, 0s),
               dot-pulse 2.6s ease-in-out infinite calc(var(--dd, 0s) + .4s);
}

@keyframes dot-in {
    to { opacity: 1; }
}

@keyframes dot-pulse {
    0%, 100% { r: 3; opacity: 1; }
    50% { r: 4.5; opacity: .55; }
}

.hero-terminal {
    background: rgba(6, 5, 12, .55);
    border: 1px solid rgba(255, 255, 255, .1);
    border-radius: 14px;
    padding: 1rem 1.1rem 1.15rem;
    font-family: var(--font-mono);
    font-size: .8rem;
    color: #d9d4e8;
}

.term-dots {
    margin-bottom: .7rem;
}

.term-dots span {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    margin-right: 6px;
}

.term-dots span:nth-child(1) { background: #ff5f57; }
.term-dots span:nth-child(2) { background: #febc2e; }
.term-dots span:nth-child(3) { background: #28c840; }

.term-line {
    opacity: 0;
    transform: translateX(-8px);
    animation: term-in .45s ease-out forwards;
    animation-delay: calc(var(--d, 0) * .3s + 1.6s);
    line-height: 1.7;
}

.term-line .prompt {
    color: var(--accent);
}

.term-line.ok {
    color: #86efac;
}

@keyframes term-in {
    to { opacity: 1; transform: translateX(0); }
}

.term-cursor {
    display: inline-block;
    width: 7px;
    height: 13px;
    background: var(--accent);
    opacity: 0;
    vertical-align: middle;
    animation: term-in .3s ease-out forwards calc(4 * .3s + 1.6s),
               blink 1s step-end infinite calc(4 * .3s + 1.9s);
}

@keyframes blink {
    50% { opacity: 0; }
}

.kicker {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: .14em;
    font-size: .78rem;
    font-weight: 600;
    color: var(--accent);
}

.live-dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    margin-right: 8px;
    vertical-align: middle;
    animation: live-ping 2.2s ease-out infinite;
}

@keyframes live-ping {
    0% { box-shadow: 0 0 0 0 rgba(var(--accent-rgb), .55); }
    70% { box-shadow: 0 0 0 8px rgba(var(--accent-rgb), 0); }
    100% { box-shadow: 0 0 0 0 rgba(var(--accent-rgb), 0); }
}

.text-gradient {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ============ Buttons ============ */
.btn {
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: .01em;
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border: none;
    box-shadow: 0 8px 20px -8px rgba(var(--accent-rgb), .55);
}

.btn-primary:hover,
.btn-primary:focus {
    filter: brightness(1.08);
    box-shadow: 0 10px 26px -8px rgba(var(--accent-rgb), .7);
}

.btn-outline-primary {
    color: var(--accent);
    border-color: var(--accent);
}

.btn-outline-primary:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #08110f;
}

.btn-outline-light {
    border-color: var(--glass-border);
    color: var(--text);
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.btn-outline-light:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--accent);
}

/* ============ Cards (liquid glass) ============ */
.card {
    position: relative;
    overflow: hidden;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    color: var(--text);
    box-shadow: var(--glass-shadow);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    backdrop-filter: blur(24px) saturate(160%);
}

/* Cursor-follow glass highlight — set via --spot-x/--spot-y in main.js */
.card::after,
.skill-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(320px circle at var(--spot-x, 50%) var(--spot-y, 50%), rgba(var(--accent-rgb), .16), transparent 70%);
    opacity: 0;
    transition: opacity .35s ease;
    pointer-events: none;
}

.card:hover::after,
.skill-card:hover::after {
    opacity: 1;
}

.jumbotron {
    background: var(--glass-bg);
    color: var(--text);
}

.modal-content {
    background: var(--glass-bg);
    color: var(--text);
    border: 1px solid var(--glass-border);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    backdrop-filter: blur(24px) saturate(160%);
}

/* Card hover effect */
.lift {
    position: relative;
    overflow: hidden;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.lift::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .25s ease;
}

.lift:hover {
    transform: translateY(-5px);
    box-shadow: 0 1.25rem 2.5rem -0.75rem rgba(0, 0, 0, .3);
    border-color: var(--accent);
}

.lift:hover::before {
    transform: scaleX(1);
}

/* Featured project card */
.featured-card {
    border: 1px solid rgba(var(--accent-rgb), .45);
    box-shadow: 0 0 0 1px rgba(var(--accent-rgb), .1), var(--shadow-soft);
}

.badge-featured {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: .64rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    font-weight: 700;
    padding: .3rem .6rem;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    color: #08110f;
    vertical-align: middle;
    margin-left: .5rem;
}

/* Tech stack chips */
.tech-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: .72rem;
    font-weight: 500;
    padding: .28rem .65rem;
    margin: .15rem .25rem .15rem 0;
    border-radius: 999px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

/* Featured project highlights (qualitative, no numbers) */
.feature-highlights {
    list-style: none;
    padding-left: 0;
    margin: .25rem 0 1.25rem;
}

.feature-highlights li {
    display: flex;
    align-items: flex-start;
    gap: .6rem;
    margin-bottom: .55rem;
    color: var(--text-muted);
    font-size: .95rem;
}

.feature-highlights li i {
    color: var(--accent);
    margin-top: .2rem;
    flex-shrink: 0;
}

/* Quant metrics strip */
.quant-metrics {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    margin: 1rem 0;
}

.metric-value {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--text);
}

.metric-label {
    font-size: .7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
}

/* Results table */
.table-quant {
    width: 100%;
    font-size: .88rem;
    color: var(--text);
}

.table-quant th {
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: .68rem;
    letter-spacing: .05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    padding: .5rem .75rem;
    text-align: left;
}

.table-quant td {
    padding: .55rem .75rem;
    border-bottom: 1px solid var(--border);
}

.table-quant tr:last-child td {
    border-bottom: none;
}

.table-quant td.num,
.table-quant th.num {
    font-family: var(--font-mono);
}

/* Skills grid */
.skill-card {
    position: relative;
    overflow: hidden;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--glass-shadow);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    backdrop-filter: blur(24px) saturate(160%);
    padding: 1.75rem 1.6rem;
    height: 100%;
    transition: border-color .18s ease, transform .18s ease;
}

.skill-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.skill-icon {
    font-size: 1.6rem;
    color: var(--accent);
    margin-bottom: .5rem;
    display: block;
}

.skill-card h5 {
    font-weight: 700;
    margin-bottom: .5rem;
}

.card-index {
    position: absolute;
    top: 1.15rem;
    right: 1.4rem;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--border);
    letter-spacing: .05em;
}

.skill-hook {
    font-weight: 600;
    color: var(--text);
    margin: 0 0 1rem;
    font-size: .98rem;
}

.skill-hook code {
    font-size: .85em;
}

.skill-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
    font-size: .85rem;
    color: var(--text-muted);
}

.skill-list li {
    display: flex;
    align-items: flex-start;
    gap: .55rem;
    margin-bottom: .6rem;
    line-height: 1.5;
}

.skill-list li:last-child {
    margin-bottom: 0;
}

.skill-list li i {
    color: var(--accent);
    margin-top: .2rem;
    flex-shrink: 0;
}

/* Section kicker + heading helper */
.section-header {
    margin-bottom: 2rem;
}

/* Badges (languages, tags) */
.badge {
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: .72rem;
    padding: .4em .8em;
}

.badge-primary {
    background: var(--accent) !important;
    color: #08110f !important;
}

.badge-info {
    background: var(--accent-2) !important;
    color: #ffffff !important;
}

.badge-warning {
    background: #f59e0b !important;
    color: #1a1200 !important;
}

/* Back-to-top button */
#backToTop {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: none;
    width: 46px;
    height: 46px;
    padding: 0;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border: none;
    box-shadow: 0 8px 20px -6px rgba(var(--accent-rgb), .55);
}

/* Social icon links (footer) */
.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    margin: 0 .25rem;
    transition: all .18s ease;
}

.social-links a:hover {
    color: var(--bg);
    background: var(--accent);
    border-color: var(--accent);
}

/* Timeline style */
ul.timeline {
    list-style: none;
    padding-left: 0;
}

ul.timeline li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: .5rem;
}

ul.timeline li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* List groups (experience page) */
.list-group-item {
    background: var(--glass-bg);
    color: var(--text);
    border-color: var(--glass-border);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
    backdrop-filter: blur(20px) saturate(150%);
}

.list-group-item h5 {
    color: var(--text);
}

/* Forms */
.form-control {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
}

.form-control:focus {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-control::placeholder {
    color: var(--text-muted);
}

label {
    color: var(--text-muted);
    font-weight: 500;
    font-size: .9rem;
}

/* attribute selector and descendant selector */
input[required] {
    border-left: 3px solid var(--accent);
}

/* Default on desktop: image takes 50% of the container width */
.responsive-img {
    width: 50%;
}

/* On mobile (≤ 768px): increase image width to 75% for better readability */
@media (max-width: 768px) {
    .responsive-img {
        width: 75%;
    }
}

/* Default on desktop: smaller image for Game of Life screenshots (40%) */
.responsive-img-game-of-life {
    width: 40%;
}

/* On mobile (≤ 768px): allow Game of Life images to use full width */
@media (max-width: 768px) {
    .responsive-img-game-of-life {
        width: 100%;
    }
}

/* Fix carousel height to prevent layout jumps when switching images */
.uniform-carousel .carousel-item {
    height: 375px;
}

/* Ensure images fit nicely inside the fixed carousel container */
.uniform-carousel .carousel-item img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
    width: auto;
    height: auto;
    margin: auto;
    display: block;
}

/* On mobile (≤ 768px): reduce carousel height to avoid excess empty space */
@media (max-width: 768px) {
    .uniform-carousel .carousel-item {
        height: 220px;
    }
}

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

/* Scroll reveal — main.js adds .reveal-init on load (so content stays
   visible if JS never runs), then .is-visible once scrolled into view */
.reveal.reveal-init {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity .7s ease, transform .7s ease;
    transition-delay: calc(var(--i, 0) * 100ms);
}

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