:root {
    --primary: #5B4BFF;
    --secondary: #00BFA6;
    --background: #F8FAFF;
    --surface: #ffffff;
    --text: #0F172A;
    --muted: #4B5563;
    --accent: #F9B934;
    --border: #E2E8F0;
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --shadow-lg: 0 25px 60px rgba(15, 23, 42, 0.18);
    --shadow-md: 0 18px 40px rgba(15, 23, 42, 0.12);
    --shadow-sm: 0 8px 20px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", Roboto, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.75;
}

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

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(18px);
    padding: 1rem 2.4rem;
    display: flex;
    justify-content: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.nav-inner {
    width: min(1100px, 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: white;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.brand span {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.35rem;
    width: 100%;
    height: 2px;
    background: rgba(255,255,255,0);
    transition: background 0.3s ease;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
    background: rgba(255,255,255,0.7);
}

.language-switcher {
    display: flex;
    gap: 0.4rem;
}

.lang-button {
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.08);
    color: white;
    padding: 0.35rem 0.85rem;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    cursor: pointer;
}

.lang-button.active,
.lang-button:hover {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: 0 10px 24px rgba(91, 75, 255, 0.28);
}

main {
    width: min(900px, 100%);
    margin: 0 auto;
    padding: 2.8rem 1.6rem 4rem;
}

.hero {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.hero h1 {
    font-size: clamp(2rem, 3vw, 3rem);
    margin-bottom: 1rem;
}

.hero .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.8rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.hero img {
    width: 100%;
    border-radius: var(--radius-md);
    margin: 1.8rem 0;
    box-shadow: var(--shadow-md);
}

.article-body {
    margin-top: 3rem;
    display: grid;
    gap: 1.5rem;
}

.article-body h2 {
    font-size: clamp(1.4rem, 2.2vw, 2rem);
    margin: 1rem 0 0.4rem;
}

.article-body p {
    color: var(--muted);
    margin: 0;
}

.article-body ul,
.article-body ol {
    padding-left: 1.2rem;
    margin: 0;
    color: var(--muted);
}

blockquote {
    background: rgba(91,75,255,0.08);
    border-left: 4px solid var(--primary);
    padding: 1.2rem 1.5rem;
    border-radius: var(--radius-sm);
    color: var(--muted);
    margin: 0;
}

.figure {
    margin: 0;
}

.figure img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.figure figcaption {
    margin-top: 0.6rem;
    font-size: 0.9rem;
    color: var(--muted);
}

.video-wrapper {
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.video-wrapper iframe {
    width: 100%;
    height: 360px;
    border: 0;
}

.callout {
    background: linear-gradient(145deg, rgba(91,75,255,0.12), rgba(0,191,166,0.12));
    border-radius: var(--radius-md);
    padding: 1.8rem;
    border: 1px solid rgba(91,75,255,0.16);
}

.footer {
    margin-top: 4rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 2rem 1.6rem;
    color: var(--muted);
    text-align: center;
}

.lang-block {
    display: none;
}

.lang-block.active {
    display: block;
}

@media (max-width: 720px) {
    .navbar { padding: 0.9rem 1.2rem; }
    .nav-links { display: none; }
    .video-wrapper iframe { height: 220px; }
    main { padding: 2rem 1.1rem 3rem; }
    .hero { padding: 2rem; }
}