/* ═══════════════════════════════════════════════════════════
   Administrative Reach — Academic Paper Landing Page
   Premium dark-mode design with glassmorphism accents
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
    --clr-bg: #0b0f1a;
    --clr-bg-alt: #111827;
    --clr-surface: rgba(255, 255, 255, 0.04);
    --clr-surface-hover: rgba(255, 255, 255, 0.07);
    --clr-glass: rgba(255, 255, 255, 0.06);
    --clr-glass-border: rgba(255, 255, 255, 0.10);
    --clr-primary: #60a5fa;
    --clr-primary-dim: #3b82f6;
    --clr-accent: #a78bfa;
    --clr-accent-dim: #7c3aed;
    --clr-text: #e2e8f0;
    --clr-text-muted: #94a3b8;
    --clr-text-dim: #64748b;
    --clr-divider: rgba(255, 255, 255, 0.08);
    --clr-keyword-bg: rgba(96, 165, 250, 0.12);
    --clr-keyword-border: rgba(96, 165, 250, 0.25);
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --container-max: 860px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 60px rgba(96, 165, 250, 0.08);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--clr-bg);
    color: var(--clr-text);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ── Background Effects ── */
.page-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.page-bg .orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: orbFloat 20s ease-in-out infinite alternate;
}

.page-bg .orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--clr-primary-dim), transparent 70%);
    top: -15%;
    left: -10%;
}

.page-bg .orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--clr-accent-dim), transparent 70%);
    bottom: -10%;
    right: -8%;
    animation-delay: -8s;
    animation-duration: 25s;
}

.page-bg .orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.35), transparent 70%);
    top: 55%;
    left: 50%;
    animation-delay: -14s;
    animation-duration: 22s;
}

@keyframes orbFloat {
    0% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(40px, -30px) scale(1.08);
    }

    100% {
        transform: translate(-20px, 20px) scale(0.95);
    }
}

/* ── Layout ── */
.page-wrapper {
    position: relative;
    z-index: 1;
    padding: 3rem 1.5rem 4rem;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
}

/* ── Back Link ── */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--clr-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 2.5rem;
    transition: color 0.25s, transform 0.25s;
}

.back-link:hover {
    color: var(--clr-primary);
    transform: translateX(-4px);
}

.back-link svg {
    transition: transform 0.25s;
}

.back-link:hover svg {
    transform: translateX(-3px);
}

/* ── Header / Hero Card ── */
.paper-hero {
    background: var(--clr-glass);
    border: 1px solid var(--clr-glass-border);
    border-radius: var(--radius-lg);
    padding: 3rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow-card), var(--shadow-glow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.paper-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.06) 0%, transparent 50%, rgba(167, 139, 250, 0.06) 100%);
    pointer-events: none;
}

.paper-type-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--clr-primary-dim), var(--clr-accent-dim));
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    margin-bottom: 1.8rem;
    position: relative;
}

.paper-hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 700;
    line-height: 1.25;
    color: #fff;
    margin-bottom: 1.5rem;
    position: relative;
}

.meta-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.2rem 2rem;
    position: relative;
}

.meta-item {
    font-size: 0.95rem;
    color: var(--clr-text-muted);
}

.meta-item .label {
    font-weight: 600;
    color: var(--clr-text);
    margin-right: 0.3rem;
}

.meta-item a {
    color: var(--clr-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.meta-item a:hover {
    color: var(--clr-accent);
    text-decoration: underline;
}

/* ── Citation bar ── */
.citation-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1.8rem;
    padding: 0.85rem 1.2rem;
    background: var(--clr-surface);
    border: 1px solid var(--clr-divider);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--clr-text-muted);
    font-family: 'Courier New', monospace;
    word-break: break-all;
    position: relative;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}

.citation-bar:hover {
    background: var(--clr-surface-hover);
    border-color: var(--clr-primary);
}

.citation-bar .copy-icon {
    flex-shrink: 0;
    color: var(--clr-primary);
}

.citation-bar .copy-tooltip {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--clr-primary);
    color: #fff;
    font-family: var(--font-body);
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.citation-bar.copied .copy-tooltip {
    opacity: 1;
}

/* ── Section Cards ── */
.section-card {
    background: var(--clr-glass);
    border: 1px solid var(--clr-glass-border);
    border-radius: var(--radius-md);
    padding: 2.2rem 2.5rem;
    margin-bottom: 1.8rem;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.section-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card), 0 0 40px rgba(96, 165, 250, 0.06);
}

.section-card h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: 1rem;
    padding-bottom: 0.7rem;
    border-bottom: 2px solid var(--clr-divider);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.section-card h2 .icon {
    font-size: 1.2rem;
    opacity: 0.7;
}

/* ── Abstract ── */
.abstract-text {
    font-size: 1.02rem;
    line-height: 1.85;
    color: var(--clr-text);
    font-style: italic;
    border-left: 3px solid var(--clr-primary-dim);
    padding-left: 1.5rem;
}

/* ── Keywords ── */
.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    list-style: none;
}

.keywords-list li {
    background: var(--clr-keyword-bg);
    border: 1px solid var(--clr-keyword-border);
    color: var(--clr-primary);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    transition: background 0.2s, transform 0.2s;
}

.keywords-list li:hover {
    background: rgba(96, 165, 250, 0.2);
    transform: translateY(-1px);
}

/* ── Highlights / Findings ── */
.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.highlight-item {
    background: var(--clr-surface);
    border: 1px solid var(--clr-divider);
    border-radius: var(--radius-sm);
    padding: 1.3rem;
    transition: background 0.2s, border-color 0.3s, transform 0.3s;
}

.highlight-item:hover {
    background: var(--clr-surface-hover);
    border-color: var(--clr-primary);
    transform: translateY(-2px);
}

.highlight-item .hi-icon {
    font-size: 1.5rem;
    margin-bottom: 0.6rem;
    display: block;
}

.highlight-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.4rem;
}

.highlight-item p {
    font-size: 0.85rem;
    color: var(--clr-text-muted);
    line-height: 1.55;
}

/* ── Publication Details ── */
.detail-list {
    list-style: none;
    display: grid;
    gap: 0.7rem;
}

.detail-list li {
    display: flex;
    gap: 0.8rem;
    font-size: 0.95rem;
    color: var(--clr-text);
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--clr-divider);
}

.detail-list li:last-child {
    border-bottom: none;
}

.detail-list .dt {
    font-weight: 600;
    color: var(--clr-text-muted);
    min-width: 110px;
    flex-shrink: 0;
}

.detail-list .dd a {
    color: var(--clr-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.detail-list .dd a:hover {
    color: var(--clr-accent);
}

/* ── Action Buttons ── */
.actions-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--clr-primary-dim), var(--clr-accent-dim));
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.btn-secondary {
    background: var(--clr-surface);
    color: var(--clr-primary);
    border: 1px solid var(--clr-glass-border);
}

.btn-secondary:hover {
    background: var(--clr-surface-hover);
    border-color: var(--clr-primary);
    transform: translateY(-2px);
}

/* ── License ── */
.license-note {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.82rem;
    color: var(--clr-text-dim);
    margin-top: 1rem;
    padding: 0.8rem 1rem;
    background: var(--clr-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--clr-divider);
}

.license-note a {
    color: var(--clr-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ── Footer ── */
.page-footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--clr-divider);
    color: var(--clr-text-dim);
    font-size: 0.85rem;
}

.page-footer a {
    color: var(--clr-primary);
    text-decoration: none;
}

.page-footer a:hover {
    text-decoration: underline;
}

/* ── Animations ── */
.fade-up {
    opacity: 0;
    transform: translateY(24px);
    animation: fadeUp 0.7s ease forwards;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }
.delay-6 { animation-delay: 0.6s; }
.delay-7 { animation-delay: 0.7s; }

/* ── Responsive ── */
@media (max-width: 680px) {
    .page-wrapper {
        padding: 1.5rem 1rem 3rem;
    }

    .paper-hero {
        padding: 2rem 1.5rem;
    }

    .section-card {
        padding: 1.5rem;
    }

    .meta-grid {
        flex-direction: column;
        gap: 0.6rem;
    }

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

    .actions-row {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }

    .detail-list li {
        flex-direction: column;
        gap: 0.2rem;
    }

    .detail-list .dt {
        min-width: unset;
    }
}