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

:root {
    --article-max-width: 52rem;
    --background-color: #f2f5ff;
    --surface-color: #ffffff;
    --text-color: #1f2a37;
    --muted-text-color: #5f6b7a;
    --accent-color: #5662ff;
    --accent-soft: rgba(86, 98, 255, 0.12);
    --border-color: rgba(30, 41, 59, 0.08);
    --shadow-color: rgba(15, 23, 42, 0.08);
    --shadow-color-strong: rgba(15, 23, 42, 0.12);
}

body {
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: radial-gradient(circle at top, rgba(86, 98, 255, 0.12), transparent 55%), var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
}

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

a:hover {
    text-decoration: underline;
}

.article-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.article-page .page-content {
    width: min(100%, var(--article-max-width));
    margin: clamp(2rem, 6vw, 4rem) auto clamp(3rem, 8vw, 5rem);
    padding: clamp(1.5rem, 4vw, 3rem) clamp(1.25rem, 6vw, 2.5rem);
    display: flex;
    flex-direction: column;
    gap: clamp(1.5rem, 3vw, 2.5rem);
    background-color: var(--surface-color);
    border-radius: clamp(1.25rem, 3vw, 1.75rem);
    border: 1px solid var(--border-color);
    box-shadow: 0 14px 28px var(--shadow-color), 0 10px 10px var(--shadow-color-strong);
}

.article-page .page-content > * {
    margin: 0;
}

.article-page h1,
.article-page h2,
.article-page h3 {
    text-align: center;
}

.article-page p {
    line-height: 1.7;
    overflow-wrap: anywhere;
    color: var(--muted-text-color);
}

.article-page img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    display: block;
    margin: 0 auto;
    box-shadow: 0 10px 18px rgba(15, 23, 42, 0.12);
}

.article-page hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.article-page nav a.btn {
    font-weight: 600;
    border-radius: 999px;
    padding: 0.65rem 1.5rem;
}

.article-page nav .btn-outline-secondary {
    color: var(--muted-text-color);
    border-color: var(--border-color);
}

.article-page nav .btn-outline-primary {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.navbar.bg-body-tertiary {
    background: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
}

.navbar .nav-link {
    color: var(--muted-text-color);
    font-weight: 500;
}

.navbar .nav-link.active,
.navbar .nav-link:focus,
.navbar .nav-link:hover {
    color: var(--accent-color);
}

.dropdown-menu {
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.18);
}

.dropdown-item.active,
.dropdown-item:active {
    background-color: var(--accent-soft);
    color: var(--accent-color);
}

.border-dashed {
    border: 1px dashed var(--border-color);
}

.progress {
    background-color: rgba(86, 98, 255, 0.1);
}

.progress-bar {
    background: linear-gradient(90deg, var(--accent-color), #3d4ad9);
}

.card .badge.bg-light {
    background-color: #f4f5f8 !important;
}

.btn.disabled,
.btn:disabled {
    pointer-events: none;
    opacity: 0.6;
}

@media (max-width: 576px) {
    .article-page .page-content {
        padding: 1.75rem 1.25rem 2.25rem;
        gap: 1.5rem;
        border-radius: 1.25rem;
        margin: 1.5rem 1rem 3rem;
    }

    .article-page img {
        border-radius: 0.35rem;
    }
}