/* Physics Access — public site design system */

:root {
    --site-header-height: 3.5rem;
    --color-green: #008c23;
    --color-green-dark: #006b1a;
    --color-green-light: #e8f5ec;
    --color-yellow: #facc15;
    --color-cream: #f8f6f2;
    --color-ink: #0f172a;
    --color-muted: #64748b;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
    --shadow-card-hover: 0 4px 12px rgba(0, 140, 35, 0.1), 0 16px 40px rgba(15, 23, 42, 0.08);
}

[x-cloak] {
    display: none !important;
}

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

/* Body & layout */
.site-body {
    min-height: 100vh;
    background-color: var(--color-cream);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 140, 35, 0.08), transparent),
        radial-gradient(circle at 100% 100%, rgba(250, 204, 21, 0.06), transparent 40%);
    color: var(--color-ink);
    font-family: 'DM Sans', system-ui, sans-serif;
}

.site-main {
    max-width: 80rem;
    margin: 0 auto;
    padding: 2rem 1rem 3rem;
    padding-top: calc(var(--site-header-height) + 1.5rem);
}

.site-main__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .site-main__grid {
        grid-template-columns: 1fr 280px;
        gap: 2.5rem;
    }
}

.site-main__content {
    min-width: 0;
}

.site-sidebar {
    min-width: 0;
}

@media (min-width: 1024px) {
    .site-sidebar {
        position: sticky;
        top: calc(var(--site-header-height) + 1rem);
        align-self: start;
    }
}

html.nav-open {
    overflow: hidden;
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    height: var(--site-header-height);
    background: linear-gradient(135deg, rgba(0, 107, 26, 0.97) 0%, rgba(0, 140, 35, 0.95) 100%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.site-header__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    height: var(--site-header-height);
    padding: 0 1rem;
    max-width: 80rem;
    margin: 0 auto;
}

@media (min-width: 640px) {
    .site-header__bar {
        padding: 0 1.5rem;
    }
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    min-width: 0;
    text-decoration: none;
}

.site-brand__logo {
    width: 2rem;
    height: 2rem;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.site-brand:hover .site-brand__logo {
    transform: scale(1.05);
}

.site-brand__text {
    font-size: 1.125rem;
    font-weight: 700;
    line-height: 1;
    white-space: nowrap;
}

.site-nav-desktop {
    display: none;
    align-items: center;
    gap: 0.25rem;
}

@media (min-width: 1024px) {
    .site-nav-desktop {
        display: flex;
    }
}

.site-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.4rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.92);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: background 0.15s ease;
}

.site-nav-link:hover,
.site-nav-link--btn:hover {
    background: rgba(255, 255, 255, 0.14);
}

.site-nav-link--btn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.site-nav-dropdown {
    position: relative;
}

.site-nav-menu {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 0.25rem;
    min-width: 11rem;
    padding: 0.35rem;
    background: #fff;
    border-radius: 0.625rem;
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: var(--shadow-card-hover);
}

.site-nav-menu a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-ink);
    text-decoration: none;
    border-radius: 0.375rem;
    transition: background 0.15s ease, color 0.15s ease;
}

.site-nav-menu a:hover {
    background: var(--color-green-light);
    color: var(--color-green);
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.site-header__actions--desktop {
    display: none;
}

@media (min-width: 1024px) {
    .site-header__actions--desktop {
        display: flex;
    }
    .site-header__actions--mobile {
        display: none;
    }
}

.site-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
}

.site-nav-mobile {
    display: block;
    padding: 0.75rem 1rem 1rem;
    background: rgba(0, 107, 26, 0.98);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-height: min(70vh, 24rem);
    overflow-y: auto;
}

@media (min-width: 1024px) {
    .site-nav-mobile {
        display: none !important;
    }
}

.site-nav-mobile-link {
    display: block;
    padding: 0.625rem 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    border-radius: 0.375rem;
}

.site-nav-mobile-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

.site-nav-mobile-sub {
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.site-nav-mobile-sub a {
    display: block;
    padding: 0.5rem 0.5rem;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
}

.site-nav-mobile-cta {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-ghost,
.btn-accent {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.25;
    text-decoration: none;
    border-radius: 0.625rem;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-primary {
    background: var(--color-green);
    color: #fff;
    box-shadow: 0 2px 8px rgba(0, 140, 35, 0.35);
}

.btn-primary:hover {
    background: var(--color-green-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 140, 35, 0.4);
}

.btn-secondary {
    background: #fff;
    color: var(--color-green);
    border: 2px solid rgba(0, 140, 35, 0.35);
}

.btn-secondary:hover {
    background: var(--color-green-light);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.btn-ghost {
    padding: 0.4rem 0.875rem;
    font-size: 0.8125rem;
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-ghost--sm {
    padding: 0.35rem 0.625rem;
    font-size: 0.75rem;
}

.btn-accent {
    padding: 0.4rem 0.875rem;
    font-size: 0.8125rem;
    background: var(--color-yellow);
    color: var(--color-green-dark);
}

.btn-accent:hover {
    filter: brightness(1.05);
}

.site-main--home {
    padding-top: calc(var(--site-header-height) + 0.5rem);
    padding-bottom: 2rem;
}

.site-main--home .site-main__grid {
    gap: 1.25rem;
}

@media (min-width: 1024px) {
    .site-main--home .site-main__grid {
        gap: 1.5rem;
    }
}

.site-main--home .site-sidebar {
    top: calc(var(--site-header-height) + 0.5rem);
}

/* Hero — compact (homepage) */
.hero-section--compact {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.hero-section--compact .hero-section__inner {
    padding: 0 0 0.75rem;
}

.hero-section--compact .hero-lead--optional {
    display: none;
}

.hero-section--compact .hero-eyebrow {
    font-size: 0.8125rem;
}

.hero-section--compact .hero-title {
    margin-top: 0.375rem;
    font-size: clamp(1.75rem, 4.5vw, 2.75rem);
    line-height: 1.1;
}

.hero-section--compact .hero-subtitle {
    margin-top: 0.5rem;
    font-size: clamp(0.9375rem, 2vw, 1.125rem);
    line-height: 1.4;
}

.hero-section--compact .hero-meta-grid {
    margin-top: 0.625rem;
    max-width: 100%;
    gap: 0.375rem;
}

.hero-section--compact .hero-meta-item {
    padding: 0.3rem 0.5rem;
}

.hero-section--compact .hero-meta-item dt {
    font-size: 0.5625rem;
}

.hero-section--compact .hero-meta-item dd {
    font-size: 0.75rem;
}

.hero-section--compact .hero-search {
    margin-top: 0.625rem;
    max-width: 100%;
}

.hero-section--compact .hero-search__input {
    padding: 0.5rem 1rem 0.5rem 2.25rem;
    font-size: 0.8125rem;
}

.hero-section--compact .hero-search__btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.hero-section--compact .hero-cta-row {
    margin-top: 0.625rem;
    gap: 0.5rem;
}

.hero-section--compact .hero-cta-row .btn-primary,
.hero-section--compact .hero-cta-row .btn-secondary {
    padding: 0.45rem 0.875rem;
    font-size: 0.75rem;
}

/* Cover beside title — centered (title only) */
.hero-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-title-row--centered {
    margin-inline: auto;
    max-width: 42rem;
}

@media (min-width: 640px) {
    .hero-title-row--centered {
        max-width: 48rem;
    }
}

.hero-title-block {
    flex: 0 1 auto;
    min-width: 0;
    text-align: center;
}

.hero-open-access {
    display: inline-block;
    margin: 0;
    padding: 0.35rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #fff;
    background: var(--color-green-dark);
    border-radius: 9999px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

@media (min-width: 640px) {
    .hero-open-access {
        font-size: 0.8125rem;
        padding: 0.4rem 1rem;
    }
}

.hero-open-access__highlight {
    color: var(--color-yellow, #facc15);
}

.hero-section--compact .hero-title-block .hero-eyebrow {
    margin-top: 0.625rem;
}

.hero-section--compact .hero-title-block .hero-title {
    margin-top: 0.375rem;
}

.hero-section__body {
    margin-top: 0.625rem;
}

.hero-browse-section {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(0, 140, 35, 0.1);
}

.hero-section--compact .hero-browse-heading {
    font-size: 0.625rem;
    margin-bottom: 0;
    text-align: left;
}

.hero-section--compact .hero-browse-card label {
    font-size: 0.6875rem;
    margin-bottom: 0.25rem;
}

.hero-section--compact .form-select {
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
}

.hero-section--compact .btn-sm {
    padding: 0.35rem 0.625rem;
    font-size: 0.75rem;
}

.hero-browse-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

@media (min-width: 640px) {
    .hero-browse-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.625rem;
    }
}

.hero-browse-controls {
    display: flex;
    gap: 0.35rem;
}

.hero-section--compact .hero-browse-card {
    margin-top: 0;
    padding: 0.4rem 0.625rem;
}


.site-main--home .articles-section {
    margin-top: 0;
}

.site-main--home .articles-section__header {
    padding: 0.875rem 1.25rem 0;
}

@media (min-width: 640px) {
    .site-main--home .articles-section__header {
        padding: 1rem 1.5rem 0;
    }
}

.site-main--home .articles-section__title {
    font-size: 1.25rem;
}

.site-main--home .articles-section__subtitle {
    font-size: 0.8125rem;
}

/* Hero — full (legacy / if used elsewhere) */
.hero-section:not(.hero-section--compact) {
    margin-top: var(--site-header-height);
}

.hero-section {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-bottom: 1px solid rgba(0, 140, 35, 0.1);
}

.hero-section--compact {
    border-bottom: none;
}

.hero-section__mesh {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(0, 140, 35, 0.12), transparent 45%),
        radial-gradient(circle at 80% 70%, rgba(250, 204, 21, 0.1), transparent 40%),
        linear-gradient(180deg, #fff 0%, var(--color-cream) 100%);
    pointer-events: none;
}

.hero-section__inner {
    position: relative;
    max-width: 80rem;
    margin: 0 auto;
    padding: 2.5rem 1rem 3rem;
}

@media (min-width: 640px) {
    .hero-section__inner {
        padding: 3rem 1.5rem 4rem;
    }
}

.hero-section__grid {
    display: grid;
    gap: 2.5rem;
    align-items: start;
}

@media (min-width: 1024px) {
    .hero-section__grid {
        grid-template-columns: 1fr 320px;
        gap: 3rem;
    }
}

.hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-green);
}

.hero-title {
    margin-top: 0.5rem;
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-ink);
}

.hero-subtitle {
    margin-top: 0.75rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-green);
}

.hero-lead {
    margin-top: 0.75rem;
    max-width: 36rem;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-muted);
}

.hero-meta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-top: 1.5rem;
    max-width: 28rem;
}

.hero-meta-item {
    padding: 0.625rem 0.75rem;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(0, 140, 35, 0.12);
    border-radius: 0.5rem;
    text-align: center;
}

.hero-meta-item dt {
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-green);
}

.hero-meta-item dd {
    margin-top: 0.125rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-ink);
}

.hero-search {
    margin-top: 1.5rem;
    max-width: 32rem;
}

.hero-search__box {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.375rem;
    background: #fff;
    border: 1px solid rgba(0, 140, 35, 0.2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
}

@media (min-width: 640px) {
    .hero-search__box {
        flex-direction: row;
        align-items: center;
    }
}

.hero-search__icon {
    position: absolute;
    left: 1rem;
    color: var(--color-muted);
    pointer-events: none;
}

.hero-search__box {
    position: relative;
}

.hero-search__input {
    flex: 1;
    min-width: 0;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    font-size: 0.875rem;
    border: none;
    background: transparent;
    outline: none;
}

.hero-search__input:focus {
    outline: none;
}

.hero-search__btn {
    flex-shrink: 0;
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #fff;
    background: var(--color-green);
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: background 0.15s ease;
}

.hero-search__btn:hover {
    background: var(--color-green-dark);
}

.hero-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.hero-cover-wrap {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-cover {
    width: 11rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card-hover);
    object-fit: cover;
    transition: transform 0.25s ease;
}

.hero-cover:hover {
    transform: translateY(-4px) rotate(-1deg);
}

.hero-cover-badge {
    position: absolute;
    bottom: -0.5rem;
    right: 1rem;
    padding: 0.35rem 0.75rem;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--color-green-dark);
    color: #fff;
    border-radius: 9999px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.hero-browse-stack {
    margin-top: 1.5rem;
}

.hero-browse-heading {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
    text-align: center;
}

.hero-browse-card {
    margin-top: 0.75rem;
    padding: 1rem;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.hero-browse-card label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-ink);
}

.hero-browse-row {
    display: flex;
    gap: 0.5rem;
}

.form-select {
    flex: 1;
    min-width: 0;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    background: #fff;
}

/* Articles section */
.articles-section {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.articles-section__header {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.25rem 1.25rem 0;
}

@media (min-width: 640px) {
    .articles-section__header {
        flex-direction: row;
        align-items: flex-end;
        justify-content: space-between;
        padding: 1.5rem 1.5rem 0;
    }
}

.articles-section__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-ink);
}

.articles-section__subtitle {
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--color-muted);
}

.articles-tabs {
    display: flex;
    gap: 0.375rem;
    padding: 0.25rem;
    background: var(--color-cream);
    border-radius: 9999px;
}

.articles-tab {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-muted);
    background: transparent;
    border: none;
    border-radius: 9999px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.articles-tab:hover {
    color: var(--color-ink);
}

.articles-tab--active {
    background: var(--color-green);
    color: #fff;
    box-shadow: 0 2px 8px rgba(0, 140, 35, 0.3);
}

.articles-panel {
    padding: 0.75rem 1.25rem 1.25rem;
}

@media (min-width: 640px) {
    .articles-panel {
        padding: 1rem 1.5rem 1.5rem;
    }
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.article-card {
    padding: 1.25rem;
    background: var(--color-cream);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.article-card:hover {
    background: #fff;
    border-color: rgba(0, 140, 35, 0.15);
    box-shadow: var(--shadow-card);
}

.badge-open-access {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.6rem;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--color-green-dark);
    background: var(--color-green-light);
    border-radius: 9999px;
}

.article-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-muted);
    text-decoration: none;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    transition: border-color 0.15s ease, color 0.15s ease;
}

.article-action-btn:hover {
    color: var(--color-green);
    border-color: rgba(0, 140, 35, 0.35);
}

.article-action-btn--primary {
    color: var(--color-green);
    border-color: rgba(0, 140, 35, 0.25);
    background: var(--color-green-light);
}

.article-abstract-panel {
    padding: 1rem;
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--color-muted);
    background: #fff;
    border-radius: 0.5rem;
    border: 1px solid #e2e8f0;
}

.articles-empty {
    padding: 3rem 1rem;
    text-align: center;
    font-size: 0.9375rem;
    color: var(--color-muted);
}

.articles-pagination {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid #e2e8f0;
}

.pagination-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-ink);
    text-decoration: none;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
}

.pagination-btn:hover {
    border-color: var(--color-green);
    color: var(--color-green);
}

.pagination-btn[aria-disabled="true"] {
    opacity: 0.45;
    pointer-events: none;
}

.pagination-pages {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.pagination-page {
    min-width: 2.25rem;
    padding: 0.4rem 0.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    color: var(--color-muted);
    border-radius: 0.375rem;
}

.pagination-page:hover {
    background: var(--color-green-light);
    color: var(--color-green);
}

.pagination-page--active {
    background: var(--color-green);
    color: #fff;
}

/* Sidebar */
.sidebar-card {
    padding: 1.25rem;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.sidebar-card__title {
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-green);
}

.sidebar-links {
    margin-top: 0.75rem;
    list-style: none;
    padding: 0;
}

.sidebar-links li {
    margin: 0;
}

.sidebar-links a {
    display: block;
    padding: 0.4rem 0;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-ink);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.15s ease;
}

.sidebar-links a:hover {
    color: var(--color-green);
}

/* Paper detail */
.paper-detail {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: 1.5rem;
}

@media (min-width: 640px) {
    .paper-detail {
        padding: 2rem;
    }
}

.paper-detail__breadcrumb a {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-green);
    text-decoration: none;
}

.paper-detail__breadcrumb a:hover {
    text-decoration: underline;
}

.paper-detail__header {
    margin-top: 1rem;
}

.paper-detail__title {
    margin-top: 0.75rem;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-ink);
}

.paper-detail__citation {
    margin-top: 0.75rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-muted);
}

.paper-detail__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--color-muted);
}

.paper-detail__meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    background: var(--color-cream);
    border-radius: 9999px;
}

.paper-detail__abstract {
    margin-top: 1.5rem;
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-ink);
}

.paper-detail__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e2e8f0;
}

.page-header {
    margin-bottom: 1.5rem;
}

.page-header__title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-ink);
}

.page-header__subtitle {
    margin-top: 0.35rem;
    font-size: 0.9375rem;
    color: var(--color-muted);
}

.prose-article p {
    margin-bottom: 0.75rem;
}

/* Footer */
.site-footer {
    margin-top: 3rem;
    background: linear-gradient(135deg, var(--color-green-dark) 0%, var(--color-green) 100%);
    color: #fff;
}

.site-footer__inner {
    max-width: 80rem;
    margin: 0 auto;
    padding: 2.5rem 1rem;
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .site-footer__inner {
        grid-template-columns: 2fr 1fr 1fr;
        padding: 2.5rem 1.5rem;
    }
}

.site-footer__links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.site-footer__links a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
}

.site-footer__links a:hover {
    color: var(--color-yellow);
}

.site-footer__social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.125rem;
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 0.5rem;
    transition: background 0.15s ease;
}

.site-footer__social a:hover {
    background: rgba(255, 255, 255, 0.22);
}

.site-footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding: 1rem;
    text-align: center;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.65);
}

/* Legacy compat */
.badge-success {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-green-dark);
    background: var(--color-green-light);
    border-radius: 9999px;
}

.btn-success,
.form-control {
    /* legacy pages */
}

.btn-success {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #fff;
    background: var(--color-green);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
}

.form-control {
    flex: 1;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}