:root {
    --bg-main: #020410;       /* Very dark navy/black */
    --bg-card: #0b1021;       /* Slightly lighter card bg */
    --border: #1e293b;        /* Slate border */
    --text-head: #f8fafc;     /* White/Bright text */
    --text-body: #94a3b8;     /* Muted slate text */
    --accent: #3b82f6;        /* Blue accent */
    --accent-2: #22c55e;
    --shadow: 0 12px 30px rgba(0,0,0,0.35);
    --surface-muted: rgba(255,255,255,0.02);
    --tag-bg: rgba(255,255,255,0.05);
    --nav-hover-bg: rgba(255,255,255,0.08);
    --tooltip-bg: rgba(2,4,16,0.9);
    --overlay-bg: rgba(0,0,0,0.8);
    --input-bg: rgba(0,0,0,0.3);
    --input-text: var(--text-head);
    --success-border: rgba(34,197,94,0.35);
    --success-bg: rgba(34,197,94,0.08);
    --success-text: #d1fae5;
    --glow-blue: rgba(59,130,246,0.22);
    --glow-green: rgba(34,197,94,0.12);
    --glow-blue-2: rgba(59,130,246,0.14);
    --font: 'Inter', sans-serif;
}

html[data-theme="light"] {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --border: rgba(15, 23, 42, 0.12);
    --text-head: #0f172a;
    --text-body: rgba(15, 23, 42, 0.72);
    --shadow: 0 10px 25px rgba(2, 6, 23, 0.10);
    --surface-muted: rgba(15, 23, 42, 0.035);
    --tag-bg: rgba(15, 23, 42, 0.06);
    --nav-hover-bg: rgba(15, 23, 42, 0.06);
    --tooltip-bg: rgba(15, 23, 42, 0.92);
    --overlay-bg: rgba(2, 6, 23, 0.55);
    --input-bg: rgba(15, 23, 42, 0.05);
    --input-text: rgba(15, 23, 42, 0.90);
    --success-border: rgba(34,197,94,0.35);
    --success-bg: rgba(34,197,94,0.12);
    --success-text: rgba(15, 23, 42, 0.90);
    --glow-blue: rgba(59,130,246,0.18);
    --glow-green: rgba(34,197,94,0.10);
    --glow-blue-2: rgba(59,130,246,0.10);
}

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

html, body {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

html::-webkit-scrollbar,
body::-webkit-scrollbar {
    width: 0;
    height: 0;
}

body {
    background-color: var(--bg-main);
    color: var(--text-body);
    font-family: var(--font);
    min-height: 100vh;
    height: 100dvh;
    overflow: hidden; /* Prevent full body scroll, we scroll main content */
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(1200px 800px at 20% -10%, var(--glow-blue), transparent 60%),
        radial-gradient(900px 700px at 95% 10%, var(--glow-green), transparent 55%),
        radial-gradient(800px 600px at 60% 120%, var(--glow-blue-2), transparent 55%);
    pointer-events: none;
    z-index: -1;
}

/* --- Layout Grid --- */
.layout-container {
    display: grid;
    grid-template-columns: 80px 1fr; /* Sidebar | Main Content */
    height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 2rem;
    gap: 2rem;
}

.nav-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-body);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    background: transparent;
    border: 1px solid transparent;
    font-family: inherit;
    transition: transform 0.2s, background 0.2s, color 0.2s, border-color 0.2s;
    text-decoration: none;
    position: relative;
}

.nav-icon:hover, .nav-icon.active {
    background: var(--nav-hover-bg);
    color: var(--text-head);
}

.nav-icon:hover {
    transform: translateY(-1px);
}

.tooltip {
    position: absolute;
    left: calc(100% + 10px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--tooltip-bg);
    border: 1px solid var(--border);
    color: var(--text-head);
    font-size: 0.75rem;
    padding: 6px 10px;
    border-radius: 8px;
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    transition: opacity 0.2s, transform 0.2s;
}

.nav-icon:hover .tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(2px);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
.nav-icon:focus-visible {
    outline: 2px solid rgba(59,130,246,0.9);
    outline-offset: 2px;
}

/* --- Main Content --- */
.main-content {
    scrollbar-width: none;
    -ms-overflow-style: none;
    overflow-y: auto;
    padding: clamp(1.25rem, 2.6vw, 2rem) clamp(1rem, 4vw, 4rem);
    width: min(1180px, 100%);
    margin: 0 auto;
}

.main-content::-webkit-scrollbar {
    width: 0;
    height: 0;
}

/* --- Top Row (Bento Layout) --- */
.top-row {
    display: grid;
    grid-template-columns: 2fr 1fr; /* 2 parts Hero, 1 part Side */
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* --- Cards (The Core Design Element) --- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 0 0 rgba(0,0,0,0);
    transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
}

.card:hover {
    box-shadow: var(--shadow);
}

.reveal { opacity: 1; transform: none; }
html.js .reveal { opacity: 0; transform: translateY(10px); }
html.js .reveal.is-visible { opacity: 1; transform: translateY(0); transition: opacity 0.55s ease, transform 0.55s ease; }

/* Hero Section */
.hero-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.avatar {
    width: 48px;
    height: 48px;
    background: var(--text-head);
    color: var(--bg-main);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.identity h1 { color: var(--text-head); font-size: 1.35rem; letter-spacing: -0.01em; }
.identity p { font-size: 0.9rem; }

.socials { margin-left: auto; display: flex; gap: 1rem; font-size: 1.2rem; }
.socials a { color: var(--text-body); }
.socials a:hover { color: var(--text-head); transform: translateY(-1px); }

.hero-body h2 { color: var(--text-head); margin-bottom: 1rem; font-size: clamp(1.3rem, 2.2vw, 1.75rem); letter-spacing: -0.02em; }
.hero-body p { max-width: 70ch; }

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 1.25rem 0 1.5rem;
}

.hero-actions .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.btn-solid,
.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: transform 0.2s, border-color 0.2s, color 0.2s, background 0.2s, box-shadow 0.2s;
}

.btn-solid {
    background: var(--text-head);
    color: var(--bg-main);
    border: 1px solid rgba(255,255,255,0.08);
}

.btn-solid:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 22px rgba(0,0,0,0.35);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(148,163,184,0.35);
    color: var(--text-head);
}

.btn-outline:hover {
    border-color: rgba(59,130,246,0.8);
    background: rgba(255,255,255,0.04);
    transform: translateY(-1px);
}

.working-list { 
    margin: 1.5rem 0; 
    padding-left: 1.2rem; 
    line-height: 1.6;
}
.working-list strong { color: var(--text-head); }

/* Floating Tech Tags */
.tech-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 2rem;
    opacity: 0.6;
}
.tech-cloud span {
    font-size: 0.8rem;
    font-family: monospace;
}

/* Side Panel (Open Source) */
.side-panel h3 { color: var(--text-head); font-size: 1rem; margin-bottom: 1.5rem; }
.side-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.side-item:last-child { border-bottom: none; }
.side-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    color: var(--text-head);
}

/* --- Featured Projects Grid --- */
.projects-section {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
}

.projects-page-sub {
    margin-top: 0.35rem;
    margin-bottom: 1.25rem;
    max-width: 70ch;
}

.projects-page-header {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem;
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
}

.projects-title-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 1.25rem;
}

.projects-kicker {
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.75;
    margin-bottom: 0.35rem;
}

.projects-title {
    color: var(--text-head);
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.btn-back {
    gap: 8px;
    padding: 10px 12px;
    border-radius: 10px;
}

.search-field {
    width: min(460px, 100%);
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 12px;
}

.search-field i {
    color: var(--text-body);
    opacity: 0.85;
    font-size: 1.05rem;
}

.projects-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: space-between;
}

#project-search {
    color: var(--input-text);
    width: 100%;
    background: transparent;
    border: none;
    padding: 0;
    font-family: inherit;
    outline: none;
}

#project-search::placeholder {
    color: var(--text-body);
    opacity: 0.7;
}

.projects-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px;
}

.chip {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-body);
    padding: 9px 12px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.85rem;
    line-height: 1;
    transition: transform 0.2s, border-color 0.2s, color 0.2s, background 0.2s;
}

.chip:hover {
    border-color: rgba(59,130,246,0.35);
    color: var(--text-head);
    background: rgba(255,255,255,0.04);
}

.chip.active {
    background: rgba(59,130,246,0.16);
    border-color: rgba(59,130,246,0.35);
    color: var(--text-head);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--surface-muted); /* Slightly transparent */
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.project-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.card-top {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.8rem;
}

.card-top h3 { color: var(--text-head); font-size: 1rem; }

.year { font-size: 0.8rem; opacity: 0.7; }

.desc { font-size: 0.9rem; margin-bottom: 1.5rem; }

.stack-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.stack-tags span {
    background: var(--tag-bg);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
.section-header h2 { color: var(--text-head); font-size: 1.1rem; }
.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-body);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, border-color 0.2s, color 0.2s, background 0.2s;
}

.btn-ghost:visited {
    color: var(--text-body);
}

.btn-ghost:hover {
    border-color: rgba(59,130,246,0.7);
    color: var(--text-head);
    background: rgba(255,255,255,0.04);
    transform: translateY(-1px);
}

.card-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    font-size: 1.2rem;
    color: var(--text-body);
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255,255,255,0.02);
    color: inherit;
    text-decoration: none;
    transition: color 0.2s, transform 0.2s, border-color 0.2s, background 0.2s;
}

.icon-btn:visited {
    color: inherit;
}

.icon-btn:hover {
    color: var(--text-head);
    border-color: rgba(59,130,246,0.35);
    background: rgba(59,130,246,0.10);
    transform: translateY(-1px);
}

.card-actions i {
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255,255,255,0.02);
    transition: color 0.2s, transform 0.2s, border-color 0.2s, background 0.2s;
}

.card-actions i:hover {
    color: var(--text-head);
    border-color: rgba(59,130,246,0.35);
    background: rgba(59,130,246,0.10);
    transform: translateY(-1px);
}

.case-hero {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem;
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
}

.case-hero-top {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 1.5rem;
    align-items: start;
}

.case-kicker {
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.75;
    margin-bottom: 0.35rem;
}

.case-title {
    color: var(--text-head);
    font-size: clamp(1.7rem, 3.2vw, 2.4rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.case-sub {
    margin-top: 0.6rem;
    max-width: 70ch;
}

.case-meta {
    margin-top: 1.25rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.case-meta-item {
    border: 1px solid var(--border);
    background: var(--surface-muted);
    border-radius: 12px;
    padding: 12px;
}

.case-meta-label {
    display: block;
    font-size: 0.75rem;
    opacity: 0.75;
    margin-bottom: 6px;
}

.case-meta-value {
    display: block;
    color: var(--text-head);
    font-weight: 600;
    line-height: 1.35;
}

.case-tags {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 8px;
}

.case-tags span {
    background: var(--tag-bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 10px;
    font-size: 0.8rem;
    color: var(--text-head);
    font-weight: 500;
}

.case-actions {
    margin-top: 1.25rem;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.case-cover {
    border: 1px dashed rgba(148,163,184,0.35);
    background: rgba(255,255,255,0.02);
    border-radius: 14px;
    min-height: 260px;
    overflow: hidden;
}

.case-cover-inner {
    height: 100%;
    display: grid;
    place-items: center;
    padding: 1.25rem;
    text-align: center;
    color: var(--text-body);
    opacity: 0.9;
}

.case-cover-inner i {
    font-size: 1.6rem;
    margin-bottom: 8px;
}

.case-section {
    margin-top: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 2rem;
    background: var(--surface-muted);
}

.case-section h2 {
    color: var(--text-head);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.case-highlights {
    padding-left: 1.2rem;
    line-height: 1.7;
}

.case-highlights li {
    margin-bottom: 0.5rem;
}

.case-muted {
    opacity: 0.75;
}

.case-gallery {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.case-media {
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.02);
    border-radius: 14px;
    overflow: hidden;
}

.case-media img {
    display: block;
    width: 100%;
    height: auto;
}

.case-img-placeholder {
    min-height: 220px;
    display: grid;
    place-items: center;
    gap: 8px;
    padding: 1.25rem;
    color: var(--text-body);
}

.case-img-placeholder i {
    font-size: 1.6rem;
}

.case-media figcaption {
    padding: 10px 12px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    opacity: 0.8;
}

.case-video {
    position: relative;
    padding-top: 56.25%;
}

.case-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

footer {
    margin-top: 3rem;
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.5;
}

/* --- Modal CSS --- */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--overlay-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 100;
}
.modal-overlay:target {
    opacity: 1;
    pointer-events: all;
}
.modal-content {
    width: 400px;
    position: relative;
}
.close-modal {
    position: absolute;
    top: 15px; right: 20px;
    text-decoration: none;
    color: white;
    font-size: 1.5rem;
}
form input, form textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--input-text);
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 6px;
    display: block;
}

form textarea { resize: vertical; }

.form-success {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--success-border);
    background: var(--success-bg);
    color: var(--success-text);
    margin-bottom: 12px;
}

.btn-primary {
    background: var(--text-head);
    color: var(--bg-main);
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
}

/* --- Contact Section --- */
.contact-section {
    margin-top: 1.5rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 1.5rem;
    align-items: start;
}

.contact-copy p {
    max-width: 60ch;
}

.contact-form {
    background: var(--surface-muted);
}

.contact-form h3 {
    color: var(--text-head);
    font-size: 1rem;
    margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 900px) {
    .layout-container { grid-template-columns: 1fr; }
    .sidebar { 
        position: fixed;
        left: 50%;
        bottom: calc(12px + env(safe-area-inset-bottom));
        transform: translateX(-50%);
        flex-direction: row;
        border-right: none;
        border-bottom: none;
        border: 1px solid var(--border);
        background: var(--bg-card);
        padding: 10px 12px;
        border-radius: 999px;
        justify-content: center;
        gap: 12px;
        z-index: 200;
        box-shadow: var(--shadow);
    }
    .top-row { grid-template-columns: 1fr; }
    .main-content { padding: 1rem; padding-bottom: calc(1rem + 84px + env(safe-area-inset-bottom)); }
    body { overflow: auto; height: auto; }
    .main-content { overflow: visible; }
    .tooltip { display: none; }
    .projects-toolbar { flex-direction: column; align-items: stretch; }
    #project-search { width: 100%; }
    .case-hero-top { grid-template-columns: 1fr; }
    .case-meta { grid-template-columns: 1fr; }
    .case-gallery { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; }
    html.js .reveal { opacity: 1; transform: none; }
}