/* ============================================================
   Design System Tokens
   See DESIGN_SYSTEM.md for philosophy and rationale.
   ============================================================ */

:root {
    /* Brand */
    --brand:          #E8B931;
    --brand-light:    #F2D166;
    --brand-subtle:   rgba(232, 185, 49, 0.08);
    --brand-muted:    rgba(232, 185, 49, 0.25);

    /* Neutrals — warm-tinted */
    --white:          #FAFAF8;
    --gray-50:        #F5F5F3;
    --gray-100:       #EBEBE7;
    --gray-200:       #D4D4CF;
    --gray-300:       #A8A8A3;
    --gray-400:       #787873;
    --gray-500:       #58584F;
    --gray-600:       #3A3A35;
    --gray-700:       #2A2A26;
    --gray-800:       #1C1C19;
    --gray-900:       #0D0D0B;

    /* Functional */
    --success:        #4A7C59;
    --error:          #C45B4A;
    --info:           #5B7B8C;

    /* Typography */
    --font-sans:      'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono:      'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

    /* Spacing (8px grid) */
    --space-1:   0.25rem;
    --space-2:   0.5rem;
    --space-3:   0.75rem;
    --space-4:   1rem;
    --space-6:   1.5rem;
    --space-8:   2rem;
    --space-12:  3rem;
    --space-16:  4rem;
    --space-24:  6rem;
    --space-32:  8rem;

    /* Radius */
    --radius-sm:   4px;
    --radius-md:   8px;
    --radius-lg:   12px;

    /* Shadows — light, functional */
    --shadow-sm:   0 1px 2px rgba(0,0,0,0.04);
    --shadow-md:   0 2px 8px rgba(0,0,0,0.06);
    --shadow-lg:   0 4px 16px rgba(0,0,0,0.08);

    /* Motion */
    --duration-fast:   80ms;
    --duration-normal: 160ms;
    --duration-slow:   300ms;
    --ease:            cubic-bezier(0.25, 0.1, 0.25, 1);

    /* Layout */
    --container-sm:   640px;
    --container-md:   768px;
    --container-lg:   1024px;
    --container-xl:   1200px;
    --nav-height:     56px;
}

/* Dark mode */
[data-theme="dark"] {
    --white:          #141412;
    --gray-50:        #1A1A17;
    --gray-100:       #242420;
    --gray-200:       #2E2E2A;
    --gray-300:       #4A4A44;
    --gray-400:       #7A7A74;
    --gray-500:       #9A9A94;
    --gray-600:       #B8B8B2;
    --gray-700:       #D4D4CF;
    --gray-800:       #E8E8E4;
    --gray-900:       #F5F5F3;
    --shadow-sm:   0 1px 2px rgba(0,0,0,0.2);
    --shadow-md:   0 2px 8px rgba(0,0,0,0.3);
    --shadow-lg:   0 4px 16px rgba(0,0,0,0.4);
}


/* ============================================================
   Reset
   ============================================================ */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + var(--space-8));
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}


/* ============================================================
   Layout
   ============================================================ */

.container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container--sm { max-width: var(--container-sm); }
.container--md { max-width: var(--container-md); }
.container--lg { max-width: var(--container-lg); }


/* ============================================================
   Navigation
   ============================================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
    height: var(--nav-height);
    transition: background var(--duration-normal) var(--ease),
                border-color var(--duration-normal) var(--ease);
}

.nav-inner {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-800);
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-link {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-400);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    transition: color var(--duration-normal) var(--ease);
    position: relative;
}

.nav-link:hover {
    color: var(--gray-800);
}

.nav-link.active {
    color: var(--gray-800);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: var(--space-3);
    right: var(--space-3);
    height: 2px;
    background: var(--brand);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-theme-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-100);
    background: var(--white);
    color: var(--gray-400);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    transition: border-color var(--duration-normal) var(--ease),
                color var(--duration-normal) var(--ease);
}

.nav-theme-toggle:hover {
    border-color: var(--gray-200);
    color: var(--gray-800);
}

/* Mobile menu */
.nav-mobile-toggle {
    display: none;
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    color: var(--gray-800);
    font-size: 1.125rem;
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-100);
        flex-direction: column;
        padding: var(--space-4) var(--space-6);
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: transform var(--duration-slow) var(--ease),
                    opacity var(--duration-slow) var(--ease);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-link {
        width: 100%;
        padding: var(--space-3) var(--space-4);
        font-size: 0.875rem;
        border-radius: var(--radius-md);
    }

    .nav-link:hover {
        background: var(--gray-50);
    }

    .nav-link.active::after {
        display: none;
    }

    .nav-link.active {
        background: var(--brand-subtle);
    }

    .nav-mobile-toggle {
        display: flex;
    }
}


/* ============================================================
   Hero
   ============================================================ */

.hero {
    padding: calc(var(--nav-height) + var(--space-24)) 0 var(--space-16);
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--gray-400);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: var(--space-6);
}

.hero-label-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand);
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.15;
    letter-spacing: -0.02em;
    max-width: 720px;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--gray-400);
    line-height: 1.6;
    max-width: 540px;
    margin-top: var(--space-6);
}

.hero-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-8);
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .hero {
        padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-12);
    }
}

/* Hero — featured content variant */
.hero--featured {
    padding: calc(var(--nav-height) + var(--space-12)) 0 var(--space-12);
}

.hero-greeting {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-300);
    margin-bottom: var(--space-8);
    letter-spacing: 0.01em;
}

.hero-feature {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: opacity var(--duration-slow) var(--ease),
                transform var(--duration-slow) var(--ease),
                border-color var(--duration-normal) var(--ease);
    touch-action: pan-y;
    user-select: none;
    -webkit-user-select: none;
}

.hero-feature:hover {
    border-color: var(--gray-200);
}

.hero-feature.fade-out {
    opacity: 0;
}

.hero-feature-art {
    width: 100%;
    min-height: 280px;
    overflow: hidden;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-feature-art svg,
.hero-feature-art img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.hero-feature-content {
    padding: var(--space-6) var(--space-8);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-feature-label {
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--brand);
    margin-bottom: var(--space-2);
}

.hero-feature-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.hero-feature-meta {
    font-size: 0.8125rem;
    color: var(--gray-400);
    margin-top: var(--space-2);
    line-height: 1.4;
}

.hero-feature-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-300);
    margin-top: var(--space-4);
    transition: color var(--duration-normal) var(--ease);
}

.hero-feature:hover .hero-feature-cta {
    color: var(--brand);
}

@media (min-width: 768px) {
    .hero-feature {
        grid-template-columns: 320px 1fr;
    }
    .hero-feature-art {
        max-height: none;
        height: 100%;
    }
    .hero-feature-content {
        padding: var(--space-8) var(--space-12);
    }
}

@media (min-width: 1024px) {
    .hero-feature {
        grid-template-columns: 380px 1fr;
    }
}

.hero-carousel-dots {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
}

.hero-carousel-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gray-200);
    border: none;
    padding: 0;
    cursor: pointer;
    transition: background var(--duration-normal) var(--ease);
}

.hero-carousel-dot.active {
    background: var(--brand);
}

.hero-carousel-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

.hero-carousel-arrow {
    display: none;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--gray-200);
    background: var(--white);
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--gray-400);
    transition: border-color var(--duration-normal) var(--ease),
                color var(--duration-normal) var(--ease);
    flex-shrink: 0;
}

@media (min-width: 768px) {
    .hero-carousel-arrow {
        display: flex;
    }
}

.hero-carousel-arrow:hover {
    border-color: var(--gray-300);
    color: var(--gray-600);
}

.hero-feature.dragging {
    transition: none;
    cursor: grabbing;
}

@media (max-width: 768px) {
    .hero--featured {
        padding: calc(var(--nav-height) + var(--space-8)) 0 var(--space-8);
    }
}


/* ============================================================
   Buttons
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    font-weight: 500;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--duration-normal) var(--ease);
    white-space: nowrap;
}

.btn--primary {
    background: var(--gray-900);
    color: var(--white);
    border-color: var(--gray-900);
}

.btn--primary:hover {
    background: var(--gray-700);
    border-color: var(--gray-700);
}

.btn--secondary {
    background: var(--white);
    color: var(--gray-800);
    border-color: var(--gray-200);
}

.btn--secondary:hover {
    border-color: var(--gray-300);
    background: var(--gray-50);
}

.btn--tactile {
    background: var(--gray-50);
    color: var(--gray-800);
    border-color: var(--gray-200);
    box-shadow:
        0 1px 2px rgba(0,0,0,0.06),
        inset 0 1px 0 rgba(255,255,255,0.5);
}

.btn--tactile:active {
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
    transform: translateY(0.5px);
}

.btn--brand {
    background: var(--gray-50);
    color: var(--gray-800);
    border-color: var(--gray-200);
    border-bottom: 2px solid var(--brand);
}

.btn--brand:hover {
    background: var(--brand-subtle);
    border-color: var(--brand-muted);
    border-bottom-color: var(--brand);
}


/* ============================================================
   Sections
   ============================================================ */

.section {
    padding: var(--space-16) 0;
}

.section + .section {
    border-top: 1px solid var(--gray-100);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--gray-300);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}

.section-label-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--brand);
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 600;
    color: var(--gray-900);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.section-desc {
    font-size: 0.9375rem;
    color: var(--gray-400);
    line-height: 1.6;
    max-width: 540px;
    margin-top: var(--space-3);
}

.section-header {
    margin-bottom: var(--space-8);
}


/* ============================================================
   List Items (shared pattern for research, blog, demos, projects)
   ============================================================ */

.list-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--gray-100);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.list-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-6);
    background: var(--white);
    transition: background var(--duration-normal) var(--ease);
}

.list-item:hover {
    background: var(--gray-50);
}

.list-item-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-400);
}

.list-item-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.list-item-body {
    flex: 1;
    min-width: 0;
}

.list-item-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-800);
    line-height: 1.3;
}

.list-item-meta {
    font-size: 0.75rem;
    color: var(--gray-300);
    margin-top: 2px;
    letter-spacing: 0.01em;
}

.list-item-arrow {
    color: var(--gray-200);
    font-size: 0.75rem;
    flex-shrink: 0;
    transition: color var(--duration-normal) var(--ease),
                transform var(--duration-normal) var(--ease);
}

.list-item:hover .list-item-arrow {
    color: var(--brand);
    transform: translateX(2px);
}

/* Two-column grid on tablet+ */
@media (min-width: 768px) {
    .list-grid--2col {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* ============================================================
   Card Grid (for projects, visual items)
   ============================================================ */

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: border-color var(--duration-normal) var(--ease);
}

.card:hover {
    border-color: var(--gray-200);
}

.card-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-800);
    margin-bottom: var(--space-1);
}

.card-role {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-300);
    font-weight: 400;
    margin-bottom: var(--space-3);
}

.card-desc {
    font-size: 0.875rem;
    color: var(--gray-400);
    line-height: 1.5;
    margin-bottom: auto;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-top: var(--space-4);
    transition: color var(--duration-normal) var(--ease);
}

.card:hover .card-link {
    color: var(--brand);
}


/* ============================================================
   Labs Gallery
   ============================================================ */

.lab-gallery {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}

@media (min-width: 640px) {
    .lab-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .lab-gallery {
        grid-template-columns: repeat(3, 1fr);
    }
}

.lab-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--duration-normal) var(--ease),
                transform var(--duration-normal) var(--ease);
    text-decoration: none;
    color: inherit;
}

.lab-card:hover {
    border-color: var(--gray-200);
    transform: translateY(-2px);
}

.lab-card-art {
    aspect-ratio: 4 / 3;
    background: var(--white);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lab-card-art svg,
.lab-card-art img {
    width: 80%;
    height: 80%;
    object-fit: contain;
}

.lab-card-body {
    padding: var(--space-4) var(--space-5);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.lab-card-tag {
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--brand);
    margin-bottom: var(--space-1);
}

.lab-card-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-800);
    line-height: 1.3;
}

.lab-card-meta {
    font-size: 0.75rem;
    color: var(--gray-300);
    margin-top: var(--space-1);
    line-height: 1.4;
}

.lab-card-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--gray-300);
    margin-top: auto;
    padding-top: var(--space-3);
}

.lab-card-status::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #4CAF50;
}

/* Featured lab — spans full width */
.lab-card--featured {
    flex-direction: row;
}

.lab-card--featured .lab-card-art {
    aspect-ratio: 1;
    width: 200px;
    flex-shrink: 0;
}

.lab-card--featured .lab-card-body {
    padding: var(--space-6);
}

.lab-card--featured .lab-card-title {
    font-size: 1.125rem;
}

@media (min-width: 640px) {
    .lab-card--featured {
        grid-column: 1 / -1;
    }
}

@media (max-width: 640px) {
    .lab-card--featured {
        flex-direction: column;
    }
    .lab-card--featured .lab-card-art {
        width: 100%;
        aspect-ratio: 4 / 3;
    }
}

/* Lab filter buttons */
.lab-filters {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-bottom: var(--space-6);
}

.lab-filter {
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--space-1) var(--space-3);
    border-radius: 999px;
    border: 1px solid var(--gray-200);
    background: transparent;
    color: var(--gray-400);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease);
}

.lab-filter:hover {
    border-color: var(--gray-300);
    color: var(--gray-600);
}

.lab-filter.active {
    background: var(--gray-900);
    border-color: var(--gray-900);
    color: var(--white);
}

[data-theme="dark"] .lab-filter.active {
    background: var(--white);
    border-color: var(--white);
    color: var(--gray-900);
}

/* ============================================================
   About Page
   ============================================================ */

.about-hero {
    padding: calc(var(--nav-height) + var(--space-24)) 0 var(--space-12);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
}

@media (min-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr 240px;
        gap: var(--space-16);
        align-items: start;
    }
}

.about-bio {
    font-size: 1.0625rem;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 600px;
}

.about-bio + .about-bio {
    margin-top: var(--space-6);
}

.about-photo {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-100);
}

@media (min-width: 768px) {
    .about-photo {
        width: 240px;
        height: 240px;
    }
}

.about-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Interest items */
.interests-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--gray-100);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

@media (min-width: 768px) {
    .interests-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.interest-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-6);
    background: var(--white);
}

.interest-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--brand);
    flex-shrink: 0;
}

.interest-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-800);
}

.interest-desc {
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: 1px;
}


/* ============================================================
   Article / Research / Blog page layout
   ============================================================ */

.article {
    max-width: var(--container-lg);
    margin: 0 auto;
    padding: calc(var(--nav-height) + var(--space-12)) var(--space-6) var(--space-16);
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-300);
    margin-bottom: var(--space-8);
    transition: color var(--duration-normal) var(--ease);
}

.article-back:hover {
    color: var(--gray-800);
}

.article-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--gray-400);
    background: var(--brand-subtle);
    border: 1px solid var(--brand-muted);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-6);
}

.article-header {
    margin-bottom: var(--space-12);
}

.article-title {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.15;
    letter-spacing: -0.02em;
    max-width: 720px;
}

.article-subtitle {
    font-size: 1.0625rem;
    color: var(--gray-400);
    margin-top: var(--space-4);
    max-width: 600px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4) var(--space-8);
    margin-top: var(--space-6);
}

.article-meta-item {
    font-size: 0.8125rem;
    color: var(--gray-400);
}

.article-meta-item strong {
    font-weight: 500;
    color: var(--gray-600);
}

.article-hero-img {
    width: 100%;
    height: clamp(200px, 30vw, 400px);
    object-fit: cover;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    margin-bottom: var(--space-12);
}

/* Content grid: main + sidebar */
.article-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
}

@media (min-width: 768px) {
    .article-grid {
        grid-template-columns: 1fr 280px;
        gap: var(--space-16);
    }
}

/* Main content prose */
.prose {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--gray-600);
}

.prose h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: var(--space-12) 0 var(--space-4);
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.prose h2:first-child {
    margin-top: 0;
}

.prose h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: var(--space-8) 0 var(--space-3);
}

.prose p {
    margin-bottom: var(--space-4);
}

.prose strong {
    font-weight: 600;
    color: var(--gray-800);
}

.prose a {
    color: var(--gray-800);
    text-decoration: underline;
    text-decoration-color: var(--brand);
    text-underline-offset: 2px;
}

.prose a:hover {
    text-decoration-color: var(--gray-800);
}

/* Highlight / callout box */
.callout {
    background: var(--gray-50);
    border-left: 3px solid var(--brand);
    padding: var(--space-6);
    margin: var(--space-8) 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.callout p {
    margin: 0;
    font-style: italic;
    color: var(--gray-700);
    font-size: 0.9375rem;
}

/* Key findings box */
.findings {
    background: var(--gray-50);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin: var(--space-8) 0;
}

.findings h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
}

.findings ul {
    list-style: none;
    padding: 0;
}

.findings li {
    padding: var(--space-2) 0;
    padding-left: var(--space-6);
    position: relative;
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.findings li::before {
    content: '';
    position: absolute;
    left: 0;
    top: calc(var(--space-2) + 0.55em);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand);
}

.findings li + li {
    border-top: 1px solid var(--gray-100);
}

/* Article sidebar */
.article-sidebar {
    position: sticky;
    top: calc(var(--nav-height) + var(--space-8));
}

.article-sidebar-section {
    margin-bottom: var(--space-8);
}

.article-sidebar-section h3 {
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--gray-300);
    margin-bottom: var(--space-3);
}

.article-sidebar-section ul {
    list-style: none;
    padding: 0;
}

.article-sidebar-section li {
    margin-bottom: var(--space-2);
}

.article-sidebar-section a {
    font-size: 0.8125rem;
    color: var(--gray-400);
    transition: color var(--duration-normal) var(--ease);
}

.article-sidebar-section a:hover {
    color: var(--gray-800);
}

.article-sidebar-section .article-meta-item {
    display: block;
    margin-bottom: var(--space-2);
}

@media (max-width: 767px) {
    .article-sidebar {
        position: static;
        border-top: 1px solid var(--gray-100);
        padding-top: var(--space-8);
    }
}


/* ============================================================
   CTA Section
   ============================================================ */

.cta {
    padding: var(--space-16) 0;
    text-align: center;
    border-top: 1px solid var(--gray-100);
}

.cta-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}

.cta-desc {
    font-size: 0.875rem;
    color: var(--gray-400);
    margin-top: var(--space-2);
    margin-bottom: var(--space-6);
}


/* ============================================================
   Footer
   ============================================================ */

.footer {
    border-top: 1px solid var(--gray-100);
    padding: var(--space-12) 0 var(--space-8);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    text-align: center;
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-link {
    font-size: 0.8125rem;
    color: var(--gray-300);
    transition: color var(--duration-normal) var(--ease);
}

.footer-link:hover {
    color: var(--gray-800);
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--gray-300);
}


/* ============================================================
   Dividers
   ============================================================ */

.divider {
    border: none;
    border-top: 1px solid var(--gray-100);
    margin: var(--space-12) 0;
}


/* ============================================================
   Utility
   ============================================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* Fade-in on scroll */
.reveal {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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