/* ==========================================================================
   Ravi — Engineering Portfolio Stylesheet
   Three Selectable Visual Directions:
   1. obsidian  (Obsidian Symbiont — Systems & AI Engineering)
   2. editorial (Editorial Quant — High-Contrast Monograph)
   3. daylight  (Daylight Lab — Clean Research Paper)
   ========================================================================== */

:root,
html[data-theme="obsidian"] {
    --bg-primary: #06080d;
    --bg-secondary: #0b101b;
    --bg-surface: rgba(13, 18, 29, 0.82);
    --bg-elevated: rgba(20, 28, 44, 0.9);
    --bg-code: #090d16;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --accent-primary: #10b981;
    --accent-secondary: #06b6d4;
    --accent-soft: rgba(16, 185, 129, 0.14);
    --accent-text-on: #03150e;
    --border-subtle: rgba(148, 163, 184, 0.16);
    --border-strong: rgba(16, 185, 129, 0.45);
    --shadow-card: 0 18px 45px -24px rgba(0, 0, 0, 0.8);
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --nav-bg: rgba(6, 8, 13, 0.78);
    --radius-card: 16px;
}

html[data-theme="editorial"] {
    --bg-primary: #09090b;
    --bg-secondary: #111114;
    --bg-surface: rgba(19, 19, 23, 0.86);
    --bg-elevated: rgba(28, 28, 34, 0.92);
    --bg-code: #0c0c0f;
    --text-primary: #fafaf9;
    --text-secondary: #d6d3d1;
    --text-muted: #a8a29e;
    --accent-primary: #f59e0b;
    --accent-secondary: #fbbf24;
    --accent-soft: rgba(245, 158, 11, 0.14);
    --accent-text-on: #181002;
    --border-subtle: rgba(250, 250, 249, 0.14);
    --border-strong: rgba(245, 158, 11, 0.5);
    --shadow-card: 0 20px 45px -24px rgba(0, 0, 0, 0.85);
    --font-display: 'Instrument Serif', 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --nav-bg: rgba(9, 9, 11, 0.82);
    --radius-card: 8px;
}

html[data-theme="daylight"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-surface: rgba(255, 255, 255, 0.9);
    --bg-elevated: #eef2f6;
    --bg-code: #0f172a;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #475569;
    --accent-primary: #2563eb;
    --accent-secondary: #0d9488;
    --accent-soft: rgba(37, 99, 235, 0.1);
    --accent-text-on: #ffffff;
    --border-subtle: rgba(15, 23, 42, 0.12);
    --border-strong: rgba(37, 99, 235, 0.45);
    --shadow-card: 0 18px 40px -24px rgba(15, 23, 42, 0.18);
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --nav-bg: rgba(248, 250, 252, 0.85);
    --radius-card: 14px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 88px;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.35s ease, color 0.35s ease;
}

::selection {
    background: var(--accent-primary);
    color: var(--accent-text-on);
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Accessible focus rings */
:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
}

.skip-link {
    position: fixed;
    top: -100px;
    left: 16px;
    z-index: 200;
    background: var(--accent-primary);
    color: var(--accent-text-on);
    padding: 10px 16px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.875rem;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 16px;
}

/* Canvas Background */
#symbiont-canvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
}

.site-shell {
    position: relative;
    z-index: 1;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 7px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-subtle);
    border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* ── Header / Navigation ── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 70px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
    flex-shrink: 0;
}

.brand-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 12px var(--accent-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.02em;
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent-primary);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* Theme Studio Switcher */
.theme-switcher {
    display: inline-flex;
    align-items: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    padding: 3px;
    gap: 2px;
}

.theme-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 999px;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.theme-btn:hover {
    color: var(--text-primary);
}

.theme-btn[aria-pressed="true"] {
    background: var(--accent-primary);
    color: var(--accent-text-on);
    font-weight: 600;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 6px 11px;
    border-radius: 999px;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
}

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

.btn-nav-resume {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent-soft);
    border: 1px solid var(--border-strong);
    color: var(--accent-primary);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 7px 14px;
    border-radius: 999px;
    transition: background-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}

.btn-nav-resume:hover {
    background: var(--accent-primary);
    color: var(--accent-text-on);
}

.mobile-menu-btn {
    display: none;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 7px 11px;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

.mobile-drawer {
    display: none;
    border-top: 1px solid var(--border-subtle);
    padding: 16px 24px 20px;
    background: var(--bg-secondary);
}

.mobile-drawer.open {
    display: block;
}

.mobile-drawer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}

.mobile-drawer-links a {
    padding: 8px 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ── Sections & Headings ── */
.section {
    padding: 88px 0;
    border-top: 1px solid var(--border-subtle);
}

.section-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-end;
    gap: 16px;
    margin-bottom: 40px;
}

.section-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--accent-primary);
    margin-bottom: 10px;
    display: block;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.9rem, 3.6vw, 2.85rem);
    font-weight: 700;
    line-height: 1.12;
    letter-spacing: -0.025em;
}

html[data-theme="editorial"] .section-title,
html[data-theme="editorial"] .hero-title {
    font-weight: 400;
    letter-spacing: -0.015em;
}

.section-lead {
    color: var(--text-muted);
    max-width: 640px;
    font-size: 1rem;
}

/* ── Hero ── */
.hero {
    padding: 76px 0 64px;
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.35fr 0.9fr;
    gap: 44px;
    align-items: center;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-strong);
    background: var(--accent-soft);
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    margin-bottom: 22px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5.4vw, 4.4rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 22px;
}

.hero-title .accent-word {
    color: var(--accent-primary);
}

.hero-copy {
    font-size: clamp(1.03rem, 1.35vw, 1.18rem);
    color: var(--text-secondary);
    max-width: 650px;
    margin-bottom: 26px;
}

.hero-tags {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    letter-spacing: 0.02em;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 36px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform 0.18s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--accent-text-on);
}

.btn-secondary {
    background: var(--bg-surface);
    border-color: var(--border-subtle);
    color: var(--text-primary);
}

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

.btn-ghost {
    background: transparent;
    border-color: var(--border-subtle);
    color: var(--text-secondary);
}

.btn-ghost:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* Telemetry Panel in Hero */
.hero-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    padding: 24px;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(12px);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 12px;
    margin-bottom: 18px;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--text-muted);
}

.status-live {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent-primary);
}

.status-live::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-primary);
}

.telemetry-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 18px;
}

.telemetry-stat {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 14px;
}

.telemetry-value {
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.15;
}

.telemetry-label {
    font-size: 0.76rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.theme-preview-box {
    border-top: 1px solid var(--border-subtle);
    padding-top: 14px;
}

.theme-preview-box p {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-family: var(--font-mono);
}

.theme-pills-inline {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.theme-pill-card {
    flex: 1;
    min-width: 90px;
    text-align: left;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.75rem;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.theme-pill-card strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.78rem;
}

.theme-pill-card[aria-pressed="true"] {
    border-color: var(--accent-primary);
    background: var(--accent-soft);
}

/* ── Surface Cards ── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    padding: 26px;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(10px);
    transition: border-color 0.25s ease, transform 0.25s ease;
}

.card:hover {
    border-color: var(--border-strong);
}

/* ── About Section ── */
.about-grid {
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    gap: 32px;
    align-items: start;
}

.about-prose p {
    color: var(--text-secondary);
    font-size: 1.04rem;
    margin-bottom: 18px;
}

.about-prose strong {
    color: var(--text-primary);
}

.journey-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.journey-item {
    padding: 20px;
    border-radius: 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--accent-primary);
}

.journey-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.journey-item p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ── Featured Projects ── */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
}

.project-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
}

.project-media {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--bg-code);
    border-bottom: 1px solid var(--border-subtle);
    overflow: hidden;
}

.project-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    transition: transform 0.45s ease;
}

.project-card:hover .project-media img {
    transform: scale(1.025);
}

.project-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(6, 8, 13, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: #f8fafc;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    backdrop-filter: blur(6px);
}

.project-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.project-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 8px;
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 700;
    line-height: 1.2;
}

.project-subtitle {
    color: var(--accent-primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.93rem;
    margin-bottom: 16px;
}

.project-highlights {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 18px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.project-highlights li {
    padding-left: 16px;
    position: relative;
}

.project-highlights li::before {
    content: "›";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 700;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: 18px;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 4px 9px;
    border-radius: 6px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

.project-footer {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
}

.link-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 7px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-elevated);
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.link-pill:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.link-pill.primary {
    background: var(--accent-soft);
    border-color: var(--border-strong);
    color: var(--accent-primary);
}

/* Custom SVG Preview Visuals inside Project Cards */
.svg-preview-stage {
    width: 100%;
    height: 100%;
    padding: 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: radial-gradient(circle at top right, rgba(16, 185, 129, 0.14), transparent 55%), #070b14;
    color: #e2e8f0;
    font-family: var(--font-mono);
}

.svg-preview-stage.amber {
    background: radial-gradient(circle at top right, rgba(245, 158, 11, 0.16), transparent 55%), #0b0c10;
}

.svg-preview-stage.cyan {
    background: radial-gradient(circle at top right, rgba(6, 182, 212, 0.16), transparent 55%), #070d17;
}

/* ── Interactive Case Studies Workbench ── */
.case-study-shell {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.case-selector-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-elevated);
}

.case-select-btn {
    padding: 9px 15px;
    border-radius: 9px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.case-select-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.case-select-btn[aria-selected="true"] {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--accent-text-on);
}

.case-tabs-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-subtle);
}

.case-tab-btn {
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.76rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.case-tab-btn:hover {
    color: var(--text-primary);
}

.case-tab-btn[aria-selected="true"] {
    background: var(--accent-soft);
    border-color: var(--border-strong);
    color: var(--accent-primary);
    font-weight: 600;
}

.case-content {
    padding: 28px;
}

.case-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 28px;
    align-items: start;
}

.case-content h3 {
    font-family: var(--font-display);
    font-size: 1.55rem;
    margin-bottom: 10px;
}

.case-content p {
    color: var(--text-secondary);
    margin-bottom: 14px;
    font-size: 0.95rem;
}

.case-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.case-list li {
    padding: 11px 14px;
    border-radius: 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.case-list strong {
    color: var(--text-primary);
}

.code-block {
    background: #060911;
    color: #e2e8f0;
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 12px;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    line-height: 1.55;
    overflow-x: auto;
    white-space: pre;
}

.case-metrics-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 16px;
}

.metric-box {
    padding: 12px;
    border-radius: 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
}

.metric-box .val {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1rem;
    color: var(--accent-primary);
}

.metric-box .lbl {
    font-size: 0.76rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ── Secondary Repositories Grid ── */
.sub-heading {
    font-family: var(--font-display);
    font-size: 1.35rem;
    margin: 48px 0 20px;
    color: var(--text-primary);
}

.mini-repos-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.mini-repo-card {
    display: flex;
    flex-direction: column;
    padding: 18px;
}

.mini-repo-thumb {
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 12px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-code);
}

.mini-repo-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.mini-repo-card h4 {
    font-size: 1.02rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.mini-repo-card p {
    font-size: 0.84rem;
    color: var(--text-muted);
    margin-bottom: 14px;
    flex: 1;
}

/* ── Skills Grid ── */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.skill-card h3 {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-primary);
    margin-bottom: 14px;
}

.skill-evidence {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
}

/* ── Open Source & Certifications ── */
.os-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 28px;
    margin-bottom: 36px;
}

.pr-table {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.pr-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    transition: border-color 0.2s ease;
}

.pr-item:hover {
    border-color: var(--accent-primary);
}

.pr-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
}

.pr-repo {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--text-muted);
}

.pr-state {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-primary);
    border: 1px solid var(--border-strong);
    white-space: nowrap;
}

.certs-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.cert-card {
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 8px;
}

.cert-issuer {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-primary);
}

.cert-name {
    font-size: 0.98rem;
    font-weight: 700;
    line-height: 1.3;
}

.cert-meta {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--text-muted);
    word-break: break-word;
}

/* ── Education Timeline ── */
.edu-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.edu-card {
    position: relative;
    border-top: 3px solid var(--accent-primary);
}

.edu-period {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--accent-primary);
    margin-bottom: 8px;
}

.edu-card h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    margin-bottom: 4px;
}

.edu-degree {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* ── Contact & Footer ── */
.contact-box {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 28px;
    align-items: center;
}

.contact-email-display {
    font-family: var(--font-mono);
    font-size: clamp(1.1rem, 2.2vw, 1.55rem);
    color: var(--accent-primary);
    font-weight: 600;
    margin: 12px 0 20px;
    display: inline-block;
    word-break: break-all;
}

.contact-links-stack {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-link-tile {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    border-radius: 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.contact-link-tile:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.contact-link-tile strong {
    display: block;
    font-size: 0.94rem;
}

.contact-link-tile span {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-muted);
}

.site-footer {
    border-top: 1px solid var(--border-subtle);
    padding: 28px 0 40px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

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

/* Subtle Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .btn, .card, .project-media img, .contact-link-tile {
        transition: none;
    }
}

/* ── Responsive Breakpoints ── */
@media (max-width: 1080px) {
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }
    .hero-grid,
    .about-grid,
    .case-grid,
    .os-grid,
    .contact-box {
        grid-template-columns: 1fr;
    }
    .mini-repos-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .skills-grid,
    .certs-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }
    .hero {
        padding: 48px 0;
        min-height: auto;
    }
    .nav-controls .btn-nav-resume,
    .nav-controls .icon-btn {
        display: none;
    }
    .projects-grid,
    .edu-grid,
    .skills-grid,
    .certs-grid,
    .mini-repos-grid,
    .case-metrics-row {
        grid-template-columns: 1fr;
    }
    .theme-btn {
        padding: 5px 8px;
        font-size: 0.68rem;
    }
}