/* ==========================================================================
   1. Design Tokens
   ========================================================================== */
:root {
    --color-bg:           #080808;
    --color-surface:      #111111;
    --color-surface-2:    #181818;
    --color-border:       rgba(255, 255, 255, 0.07);
    --color-text:         #ffffff;
    --color-text-muted:   #888888;
    --color-accent:       #00e0ff;
    --color-accent-dim:   rgba(0, 224, 255, 0.1);
    --color-accent-glow:  rgba(0, 224, 255, 0.2);

    --font-heading:  'Syne', sans-serif;
    --font-body:     'Inter', sans-serif;

    --size-xs:   0.75rem;
    --size-sm:   0.875rem;
    --size-base: 1rem;
    --size-lg:   1.125rem;
    --size-xl:   1.5rem;
    --size-2xl:  2rem;
    --size-3xl:  3rem;
    --size-4xl:  4.5rem;

    --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;

    --max-width: 1200px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --transition: 200ms ease;
    --transition-slow: 400ms ease;
}

/* ==========================================================================
   2. Reset & Base
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: var(--size-base);
    font-weight: 400;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition), opacity var(--transition);
}

a:hover { opacity: 0.8; }

ul, ol { list-style: none; }

/* ==========================================================================
   3. Accessibility
   ========================================================================== */
.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-2) var(--space-4);
    background: var(--color-accent);
    color: #000;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.skip-link:not(:focus) {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* ==========================================================================
   4. Layout Utilities
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-6);
}

/* ==========================================================================
   5. Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

.section-eyebrow {
    display: block;
    font-size: var(--size-xs);
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

.section-title {
    font-size: clamp(var(--size-2xl), 4vw, var(--size-3xl));
    margin-bottom: var(--space-8);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

/* ==========================================================================
   6. Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-8);
    font-family: var(--font-heading);
    font-size: var(--size-sm);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
    border: 1px solid transparent;
}

.btn--primary {
    background: var(--color-accent);
    color: #000;
    border-color: var(--color-accent);
}

.btn--primary:hover {
    background: transparent;
    color: var(--color-accent);
    opacity: 1;
}

.btn--outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn--outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    opacity: 1;
}

/* ==========================================================================
   7. Header & Navigation
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding-block: var(--space-4);
    border-bottom: 1px solid transparent;
    transition: background var(--transition-slow), border-color var(--transition-slow);
}

.site-header.is-scrolled {
    background: rgba(8, 8, 8, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-color: var(--color-border);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.site-header__name {
    font-family: var(--font-heading);
    font-size: var(--size-lg);
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-header__name:hover { opacity: 0.8; }

.site-header__brand .custom-logo-link img {
    height: 36px;
    width: auto;
}

.site-nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.site-nav__menu a {
    font-size: var(--size-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0.03em;
    transition: color var(--transition);
}

.site-nav__menu a:hover,
.site-nav__menu .current-menu-item > a {
    color: var(--color-text);
    opacity: 1;
}

/* Donate button in header nav */
.site-nav__menu .menu-donate > a {
    display: inline-block;
    padding: 0.4em 1.1em;
    background: var(--color-accent);
    color: #000 !important;
    font-weight: 700;
    font-size: var(--size-sm);
    letter-spacing: 0.04em;
    border-radius: 4px;
    transition: background var(--transition), box-shadow var(--transition), opacity var(--transition);
    opacity: 1;
}

.site-nav__menu .menu-donate > a:hover {
    background: #fff;
    color: #000 !important;
    box-shadow: 0 0 14px var(--color-accent-glow);
    opacity: 1;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.nav-toggle__bar {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   8. Hero Section
   ========================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-block: var(--space-32);
    padding-top: calc(var(--space-32) + 80px);
}

.hero__glow {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% 100%, rgba(0, 224, 255, 0.07) 0%, transparent 70%),
        radial-gradient(ellipse 40% 30% at 20% 60%, rgba(0, 100, 180, 0.05) 0%, transparent 60%);
    pointer-events: none;
}

.hero__inner {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero__title {
    font-size: clamp(var(--size-3xl), 7vw, var(--size-4xl));
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
}

.hero__subtitle {
    font-size: var(--size-lg);
    font-weight: 300;
    color: var(--color-text-muted);
    max-width: 600px;
    margin-bottom: var(--space-12);
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.hero__scroll-hint {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero__scroll-line {
    display: block;
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); transform-origin: top; }
    50%       { opacity: 1;   transform: scaleY(1);   transform-origin: top; }
}

/* ==========================================================================
   9. About Section
   ========================================================================== */
.about-section {
    padding-block: var(--space-24);
    border-top: 1px solid var(--color-border);
}

.about-section__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.about-section__text p {
    color: var(--color-text-muted);
    font-size: var(--size-lg);
    margin-bottom: var(--space-4);
}

.about-section__tagline {
    color: var(--color-text) !important;
    font-family: var(--font-heading);
    font-weight: 600;
    font-style: italic;
}

.about-section__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    gap: var(--space-2);
}

.stat-item__value {
    font-family: var(--font-heading);
    font-size: var(--size-xl);
    font-weight: 700;
    color: var(--color-accent);
}

.stat-item__label {
    font-size: var(--size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ==========================================================================
   10. Featured Categories
   ========================================================================== */
.featured-categories {
    padding-block: var(--space-24);
    border-top: 1px solid var(--color-border);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.category-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-8);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: border-color var(--transition), background var(--transition);
    gap: var(--space-4);
}

.category-card:hover {
    border-color: var(--color-accent);
    background: var(--color-surface-2);
    opacity: 1;
}

.category-card__name {
    font-size: var(--size-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.category-card__description {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}

.category-card__count {
    font-size: var(--size-xs);
    color: var(--color-accent);
    letter-spacing: 0.05em;
}

.category-card__arrow {
    font-size: var(--size-xl);
    color: var(--color-accent);
    flex-shrink: 0;
    transition: transform var(--transition);
}

.category-card:hover .category-card__arrow {
    transform: translateX(4px);
}

/* ==========================================================================
   11. CTA Section
   ========================================================================== */
.cta-section {
    padding-block: var(--space-24);
    border-top: 1px solid var(--color-border);
    background: radial-gradient(ellipse 60% 80% at 50% 50%, rgba(0, 224, 255, 0.04) 0%, transparent 70%);
}

.cta-section__inner {
    text-align: center;
}

.cta-section__eyebrow {
    display: block;
    font-size: var(--size-xs);
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.cta-section__title {
    font-size: clamp(var(--size-2xl), 4vw, var(--size-3xl));
    margin-bottom: var(--space-8);
    max-width: 600px;
    margin-inline: auto;
    margin-bottom: var(--space-8);
}

/* ==========================================================================
   12. Experiment Archive
   ========================================================================== */
.archive-experiment {
    padding-top: calc(var(--space-16) + 80px);
    padding-bottom: var(--space-24);
}

.archive-header {
    text-align: center;
    padding-bottom: var(--space-12);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-12);
}

.archive-header__title {
    font-size: clamp(var(--size-2xl), 5vw, var(--size-4xl));
    margin-bottom: var(--space-4);
}

.archive-header__description {
    color: var(--color-text-muted);
    font-size: var(--size-lg);
    max-width: 500px;
    margin-inline: auto;
    margin-bottom: var(--space-10);
}

.archive-filters {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.archive-filters__group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.archive-filters__label {
    font-size: var(--size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-right: var(--space-2);
}

.filter-btn {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    transition: color var(--transition), border-color var(--transition);
}

.filter-btn:hover,
.filter-btn--active {
    color: var(--color-accent);
    border-color: var(--color-accent);
    opacity: 1;
}

/* ==========================================================================
   13. Experiment Grid & Card
   ========================================================================== */
.experiment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.experiment-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition), transform var(--transition-slow);
}

.experiment-card:hover {
    border-color: rgba(0, 224, 255, 0.3);
    transform: translateY(-4px);
}

.experiment-card__image-link { display: block; }

.experiment-card__image {
    position: relative;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--color-surface-2);
}

.experiment-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.experiment-card:hover .experiment-card__image img {
    transform: scale(1.04);
}

.experiment-card__image-placeholder {
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        45deg,
        var(--color-surface-2),
        var(--color-surface-2) 10px,
        var(--color-surface) 10px,
        var(--color-surface) 20px
    );
}

.experiment-card__magnification {
    position: absolute;
    bottom: var(--space-3);
    right: var(--space-3);
    padding: var(--space-1) var(--space-3);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    color: var(--color-accent);
    font-size: var(--size-xs);
    font-weight: 600;
    font-family: var(--font-heading);
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(0, 224, 255, 0.2);
}

.experiment-card__body {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: var(--space-3);
}

.experiment-card__terms {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.term-badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: 100px;
}

.term-badge--category {
    background: var(--color-accent-dim);
    color: var(--color-accent);
    border: 1px solid rgba(0, 224, 255, 0.2);
}

.term-badge--category:hover {
    background: var(--color-accent);
    color: #000;
    opacity: 1;
}

.term-badge--method {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.experiment-card__title {
    font-size: var(--size-base);
    font-weight: 700;
    line-height: 1.3;
}

.experiment-card__title a {
    color: var(--color-text);
}

.experiment-card__title a:hover {
    color: var(--color-accent);
    opacity: 1;
}

.experiment-card__description {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
    flex: 1;
}

.experiment-card__cta {
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-accent);
    margin-top: auto;
}

.experiment-card__cta:hover { opacity: 0.75; }

/* ==========================================================================
   14. Single Experiment
   ========================================================================== */
.single-experiment {
    padding-top: calc(var(--space-12) + 80px);
    padding-bottom: var(--space-24);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
}

.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-accent); opacity: 1; }
.breadcrumb [aria-current="page"] { color: var(--color-text); }

.experiment-header {
    margin-bottom: var(--space-12);
    padding-bottom: var(--space-12);
    border-bottom: 1px solid var(--color-border);
}

.experiment-header__meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.magnification-badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: var(--color-accent-dim);
    color: var(--color-accent);
    border: 1px solid rgba(0, 224, 255, 0.3);
    border-radius: var(--radius-sm);
    font-family: var(--font-heading);
    font-size: var(--size-sm);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.experiment-header__terms { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.experiment-header__terms .term-link { color: var(--color-text-muted); font-size: var(--size-sm); }
.experiment-header__terms .term-link:hover { color: var(--color-accent); opacity: 1; }

.experiment-header__title {
    font-size: clamp(var(--size-2xl), 5vw, var(--size-3xl));
    margin-bottom: var(--space-6);
}

.experiment-header__lead {
    font-size: var(--size-xl);
    font-weight: 300;
    color: var(--color-text-muted);
    line-height: 1.6;
    max-width: 700px;
}

.experiment-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.comparison-panel {
    position: relative;
    margin: 0;
    overflow: hidden;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    aspect-ratio: 4 / 3;
    background: var(--color-surface);
}

.comparison-panel img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.comparison-label {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    padding: var(--space-1) var(--space-4);
    font-size: var(--size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: var(--radius-sm);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.comparison-panel--before .comparison-label {
    background: rgba(0, 0, 0, 0.6);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.comparison-panel--after .comparison-label {
    background: rgba(0, 224, 255, 0.15);
    color: var(--color-accent);
    border: 1px solid rgba(0, 224, 255, 0.3);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    margin-bottom: var(--space-12);
    border: 1px solid var(--color-border);
}

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

.experiment-content {
    font-size: var(--size-lg);
    line-height: 1.8;
    color: var(--color-text-muted);
    max-width: 720px;
    margin-bottom: var(--space-12);
}

.experiment-content h2,
.experiment-content h3 { color: var(--color-text); margin-block: var(--space-6) var(--space-4); }

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

.experiment-footer {
    padding-block: var(--space-8);
    border-top: 1px solid var(--color-border);
    margin-bottom: var(--space-12);
}

.experiment-footer__label {
    font-size: var(--size-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-right: var(--space-3);
}

.experiment-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--space-8);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

.experiment-nav__prev,
.experiment-nav__next {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    color: var(--color-text);
    max-width: 45%;
}

.experiment-nav__next { align-items: flex-end; text-align: right; }

.experiment-nav__dir {
    font-size: var(--size-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
}

.experiment-nav__title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: var(--size-sm);
}

/* ==========================================================================
   15. Pages & Entry Content
   ========================================================================== */
.page-content {
    padding-top: calc(var(--space-16) + 80px);
    padding-bottom: var(--space-24);
}

.page-header {
    margin-bottom: var(--space-12);
    padding-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-border);
}

.page-header__title {
    font-size: clamp(var(--size-2xl), 5vw, var(--size-3xl));
}

.entry-content {
    font-size: var(--size-lg);
    line-height: 1.8;
    color: var(--color-text-muted);
    max-width: 720px;
}

.entry-content h2,
.entry-content h3 { color: var(--color-text); margin-block: var(--space-8) var(--space-4); }

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

.entry-content a { color: var(--color-accent); }

.entry-content ul, .entry-content ol {
    list-style: revert;
    padding-left: var(--space-8);
    margin-bottom: var(--space-4);
}

/* ==========================================================================
   16. 404
   ========================================================================== */
.error-404 {
    padding-top: calc(var(--space-32) + 80px);
    padding-bottom: var(--space-32);
}

.error-404__inner { text-align: center; }

.error-404__code {
    display: block;
    font-family: var(--font-heading);
    font-size: 8rem;
    font-weight: 800;
    line-height: 1;
    color: var(--color-border);
    margin-bottom: var(--space-4);
}

.error-404__title {
    font-size: var(--size-2xl);
    margin-bottom: var(--space-4);
}

.error-404__description {
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
}

/* ==========================================================================
   17. Pagination
   ========================================================================== */
.pagination {
    margin-top: var(--space-12);
    display: flex;
    justify-content: center;
}

.pagination .page-numbers {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    justify-content: center;
}

.pagination .page-numbers li a,
.pagination .page-numbers li span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding-inline: var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    transition: border-color var(--transition), color var(--transition);
}

.pagination .page-numbers li a:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    opacity: 1;
}

.pagination .page-numbers li span.current {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #000;
}

/* ==========================================================================
   18. Footer
   ========================================================================== */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding-block: var(--space-12);
}

.site-footer__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.site-footer__logo {
    font-family: var(--font-heading);
    font-size: var(--size-lg);
    font-weight: 800;
    color: var(--color-text);
    display: block;
    margin-bottom: var(--space-1);
}

.site-footer__tagline {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
}

.site-footer__menu {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-6);
}

.site-footer__menu a {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
}

.site-footer__menu a:hover { color: var(--color-text); opacity: 1; }

.site-footer__copy {
    width: 100%;
    font-size: var(--size-xs);
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-6);
    margin-top: var(--space-4);
}

/* ==========================================================================
   19. Responsive
   ========================================================================== */
@media (max-width: 1024px) {
    .experiment-grid { grid-template-columns: repeat(2, 1fr); }
    .about-section__inner { grid-template-columns: 1fr; gap: var(--space-12); }
    .about-section__stats { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }

    .site-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(8, 8, 8, 0.98);
        display: flex;
        align-items: center;
        justify-content: center;
        transform: translateX(100%);
        transition: transform var(--transition-slow);
        z-index: 99;
    }

    .site-nav.is-open { transform: translateX(0); }

    .site-nav__menu {
        flex-direction: column;
        gap: var(--space-8);
        text-align: center;
    }

    .site-nav__menu a {
        font-size: var(--size-xl);
        color: var(--color-text);
    }

    .hero__title { letter-spacing: -0.02em; }

    .experiment-grid { grid-template-columns: 1fr; }

    .experiment-comparison { grid-template-columns: 1fr; }

    .category-grid { grid-template-columns: 1fr; }

    .experiment-navigation { flex-direction: column; }
    .experiment-nav__next { align-items: flex-start; text-align: left; }

    .site-footer__inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
    .hero__actions { flex-direction: column; align-items: flex-start; }
    .about-section__stats { grid-template-columns: 1fr; }
}

/* ==========================================================================
   20. Hero — Background Image Support
   ========================================================================== */
.hero__bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero__bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.12;
}

.hero--has-bg .hero__glow {
    background:
        radial-gradient(ellipse 100% 100% at 50% 50%, rgba(8, 8, 8, 0.6) 0%, transparent 100%),
        radial-gradient(ellipse 70% 50% at 50% 100%, rgba(0, 224, 255, 0.08) 0%, transparent 70%);
}

/* ==========================================================================
   21. Page Hero (About & Contact)
   ========================================================================== */
.page-hero {
    position: relative;
    padding-top: calc(var(--space-32) + 80px);
    padding-bottom: var(--space-24);
    overflow: hidden;
    border-bottom: 1px solid var(--color-border);
}

.page-hero__glow {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 80% at 50% 100%, rgba(0, 224, 255, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.page-hero__inner {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

.page-hero__title {
    font-size: clamp(var(--size-2xl), 5vw, var(--size-4xl));
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
}

.page-hero__subtitle {
    font-size: var(--size-lg);
    font-weight: 300;
    color: var(--color-text-muted);
    max-width: 560px;
    line-height: 1.7;
}

/* ==========================================================================
   22. About Page
   ========================================================================== */
.about-mission {
    padding-block: var(--space-24);
    border-bottom: 1px solid var(--color-border);
}

.about-mission__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.about-mission__body p {
    color: var(--color-text-muted);
    font-size: var(--size-lg);
    margin-bottom: var(--space-4);
    line-height: 1.8;
}

.about-mission__tagline {
    color: var(--color-text) !important;
    font-family: var(--font-heading);
    font-weight: 600;
    font-style: italic;
}

/* Decorative microscope cell grid */
.microscope-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    max-width: 360px;
    margin-inline: auto;
}

.microscope-grid__cell {
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.microscope-grid__cell::after {
    content: '';
    position: absolute;
    inset: 0;
}

.microscope-grid__cell--a::after {
    background: radial-gradient(circle at 65% 35%, rgba(0, 224, 255, 0.18) 0%, transparent 55%);
}

.microscope-grid__cell--b::after {
    background: radial-gradient(circle at 30% 65%, rgba(0, 100, 200, 0.2) 0%, transparent 55%);
}

.microscope-grid__cell--c::after {
    background: radial-gradient(circle at 70% 60%, rgba(0, 180, 255, 0.12) 0%, transparent 50%);
}

.microscope-grid__cell--d::after {
    background: radial-gradient(circle at 40% 30%, rgba(0, 224, 255, 0.15) 0%, transparent 55%);
}

.microscope-grid__label {
    grid-column: 1 / -1;
    text-align: center;
    font-size: var(--size-xs);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    opacity: 0.5;
    padding-top: var(--space-2);
}

/* Pillars */
.about-pillars {
    padding-block: var(--space-24);
    border-bottom: 1px solid var(--color-border);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.pillar-card {
    padding: var(--space-8);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition);
}

.pillar-card:hover {
    border-color: rgba(0, 224, 255, 0.3);
}

.pillar-card__number {
    display: block;
    font-family: var(--font-heading);
    font-size: var(--size-3xl);
    font-weight: 800;
    color: var(--color-accent);
    opacity: 0.25;
    line-height: 1;
    margin-bottom: var(--space-6);
}

.pillar-card__title {
    font-size: var(--size-lg);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.pillar-card__text {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ==========================================================================
   23. Contact Page
   ========================================================================== */
.contact-inquiries {
    padding-block: var(--space-16);
    border-bottom: 1px solid var(--color-border);
}

.inquiry-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.inquiry-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-8);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: left;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
    font-family: var(--font-body);
    color: var(--color-text);
    width: 100%;
}

.inquiry-card:hover,
.inquiry-card--active {
    border-color: var(--color-accent);
    background: var(--color-surface-2);
}

.inquiry-card--active {
    box-shadow: 0 0 0 1px var(--color-accent);
}

.inquiry-card__title {
    font-size: var(--size-base);
    font-weight: 700;
    font-family: var(--font-heading);
}

.inquiry-card__text {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
    flex: 1;
}

.inquiry-card__select {
    font-size: var(--size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-top: var(--space-2);
    transition: opacity var(--transition);
}

/* Contact Form */
.contact-form-section {
    padding-block: var(--space-24);
}

.contact-form-section__inner {
    max-width: 720px;
    margin-inline: auto;
}

.form-notice {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-8);
    font-size: var(--size-sm);
    line-height: 1.6;
}

.form-notice strong {
    display: block;
    margin-bottom: var(--space-1);
    font-family: var(--font-heading);
}

.form-notice--success {
    background: rgba(0, 224, 100, 0.08);
    border: 1px solid rgba(0, 224, 100, 0.3);
    color: #5eff9a;
}

.form-notice--error {
    background: rgba(255, 80, 80, 0.08);
    border: 1px solid rgba(255, 80, 80, 0.3);
    color: #ff7070;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

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

.form-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-field label {
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.form-field label span {
    color: var(--color-accent);
    margin-left: var(--space-1);
}

.form-field input,
.form-field textarea,
.form-field select {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: var(--size-base);
    padding: var(--space-3) var(--space-4);
    transition: border-color var(--transition), box-shadow var(--transition);
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
    color: rgba(255, 255, 255, 0.2);
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-field textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.6;
}

.form-field select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
    cursor: pointer;
}

.form-field select option {
    background: var(--color-surface-2);
    color: var(--color-text);
}

.form-field--submit {
    margin-top: var(--space-2);
}

.contact-email-note {
    margin-top: var(--space-8);
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

.contact-email-note a {
    color: var(--color-accent);
}

/* ==========================================================================
   24. Responsive — New Sections
   ========================================================================== */
@media (max-width: 1024px) {
    .about-mission__inner { grid-template-columns: 1fr; gap: var(--space-12); }
    .about-mission__visual { order: -1; }
    .microscope-grid { max-width: 300px; }
    .pillars-grid { grid-template-columns: repeat(2, 1fr); }
    .inquiry-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .pillars-grid { grid-template-columns: 1fr; }
    .inquiry-grid { grid-template-columns: 1fr; }
    .form-row--two { grid-template-columns: 1fr; }
    .page-hero { padding-top: calc(var(--space-24) + 80px); padding-bottom: var(--space-16); }
}

@media (max-width: 480px) {
    .microscope-grid { max-width: 240px; }
}

/* ==========================================================================
   25. Hero Slider (Swiper)
   ========================================================================== */
.hero-slider-section {
    padding-top: var(--header-height, 80px);
    padding-bottom: var(--space-16);
}

.hero-swiper {
    width: 100%;
    height: 100vh;
    min-height: 600px;
    --swiper-pagination-color: var(--color-accent);
    --swiper-pagination-bullet-inactive-color: rgba(255, 255, 255, 0.35);
    --swiper-pagination-bullet-inactive-opacity: 1;
    --swiper-navigation-color: var(--color-accent);
    --swiper-navigation-size: 18px;
}

.hero-swiper .swiper-wrapper {
    height: 100%;
}

.hero-swiper .swiper-slide {
    height: 100%;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-swiper .swiper-pagination {
    bottom: 52px;
}

.hero-swiper .swiper-button-prev,
.hero-swiper .swiper-button-next {
    width: 44px;
    height: 44px;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(0, 224, 255, 0.2);
    border-radius: 50%;
    transition: background var(--transition), border-color var(--transition);
}

.hero-swiper .swiper-button-prev:hover,
.hero-swiper .swiper-button-next:hover {
    background: rgba(0, 224, 255, 0.12);
    border-color: var(--color-accent);
}

.hero-swiper .swiper-button-prev::after,
.hero-swiper .swiper-button-next::after {
    font-size: 14px;
    font-weight: 800;
}

.home-content {
    padding-block: var(--space-16);
    font-size: var(--size-lg);
    line-height: 1.8;
    color: var(--color-text-muted);
    max-width: 720px;
}

.home-content p { margin-bottom: var(--space-4); }
.home-content h2, .home-content h3 { color: var(--color-text); margin-block: var(--space-6) var(--space-4); }
.home-content a { color: var(--color-accent); }

.hero-slider-section > .hero__scroll-hint {
    z-index: 10;
}

.hero--image-only .hero__bg img {
    opacity: 1;
}

@media (max-width: 768px) {
    .hero-swiper .swiper-button-prev,
    .hero-swiper .swiper-button-next { display: none; }
}

/* ==========================================================================
   26. Archive / Index Loop (fallback template)
   ========================================================================== */
.archive-loop {
    padding-top: calc(var(--space-16) + 80px);
    padding-bottom: var(--space-24);
}

.post-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-6);
    transition: border-color var(--transition), transform var(--transition-slow);
}

.post-card:hover {
    border-color: rgba(0, 224, 255, 0.3);
    transform: translateY(-4px);
}

.post-card__title {
    font-size: var(--size-base);
    font-weight: 700;
    line-height: 1.3;
}

.post-card__title a {
    color: var(--color-text);
}

.post-card__title a:hover {
    color: var(--color-accent);
    opacity: 1;
}

.post-card__excerpt {
    font-size: var(--size-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
    flex: 1;
}

.post-card__cta {
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-accent);
    margin-top: auto;
}

.post-card__cta:hover { opacity: 0.75; }

@media (max-width: 1024px) {
    .post-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .post-grid { grid-template-columns: 1fr; }
}