:root {
    --primary: #00e676;
    --primary-dim: #00c853;
    --bg-dark: #050505;
    --bg-card: #111111;
    --bg-card-hover: #1a1a1a;
    --text-main: #ffffff;
    --text-secondary: #a4a4a4;
    --text-soft: #d6d6d6;
    --border: #2f2f2f;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: "Inter", sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    position: sticky;
    top: 0;
    width: 100%;
    padding: 16px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(5, 5, 5, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 1px;
    color: #fff;
    text-decoration: none;
}

.logo span { color: var(--primary); }

nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.86rem;
    font-weight: 500;
    transition: 0.2s;
}

nav a:hover { color: #fff; }

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
}

.lang-switch a {
    color: #8d8d8d;
    text-decoration: none;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.4px;
    text-transform: uppercase;
}

.lang-switch a.active,
.lang-switch a:hover { color: var(--primary); }

.btn-solid,
.btn-outline {
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.86rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
}

.btn-solid {
    padding: 10px 18px;
    background: var(--primary);
    color: #000;
    border-color: var(--primary);
}

.btn-solid:hover {
    background: #fff;
    border-color: #fff;
}

.btn-outline {
    padding: 10px 18px;
    border-color: var(--border);
    color: #fff;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.section {
    padding: 86px 5%;
}

.hero {
    padding-top: 96px;
    background:
        linear-gradient(180deg, rgba(5, 5, 5, 0.72) 0%, rgba(5, 5, 5, 0.98) 100%),
        url("https://images.unsplash.com/photo-1451187580459-43490279c0fa?auto=format&fit=crop&q=80") center/cover no-repeat;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 14px;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.76rem;
    font-weight: 700;
}

.hero h1 {
    font-size: clamp(2rem, 4.8vw, 4rem);
    line-height: 1.08;
    max-width: 980px;
    margin-bottom: 16px;
}

.hero p {
    color: var(--text-secondary);
    max-width: 920px;
    font-size: 1.04rem;
    margin-bottom: 12px;
}

.section-head {
    max-width: 900px;
    margin-bottom: 38px;
}

.section-head h2 {
    font-size: clamp(1.8rem, 3.2vw, 2.7rem);
    line-height: 1.15;
    margin-bottom: 12px;
}

.section-head p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px;
    transition: 0.22s;
}

.card:hover {
    border-color: var(--primary-dim);
    background: var(--bg-card-hover);
}

.card h3 {
    font-size: 1.08rem;
    margin-bottom: 8px;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.93rem;
}

.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.panel {
    background: #0c0c0c;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
}

.panel h3 {
    margin-bottom: 12px;
    font-size: 1.12rem;
}

.panel ul {
    list-style: none;
}

.panel li {
    color: var(--text-soft);
    font-size: 0.92rem;
    margin-bottom: 8px;
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.panel li::before {
    content: "•";
    color: var(--primary);
    line-height: 1;
}

.module-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.module {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
}

.module .tag {
    color: var(--primary);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    display: inline-block;
    margin-bottom: 8px;
}

.module h3 {
    font-size: 1.28rem;
    margin-bottom: 10px;
}

.module ul {
    list-style: none;
}

.module li {
    color: var(--text-soft);
    font-size: 0.92rem;
    margin-bottom: 8px;
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.module li::before {
    content: "✓";
    color: var(--primary);
    font-weight: 700;
    line-height: 1;
}

.diff {
    background: #000;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.diff-list {
    list-style: none;
    margin: 12px 0 18px;
}

.diff-list li {
    color: #cfcfcf;
    margin-bottom: 8px;
}

.chain {
    border: 1px dashed #3a3a3a;
    border-radius: 8px;
    padding: 14px;
    color: var(--text-soft);
    font-size: 0.95rem;
}

.cta {
    margin-top: 22px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

footer {
    background: #030303;
    border-top: 1px solid #121212;
    padding: 28px 5%;
    color: #6f6f6f;
    font-size: 0.82rem;
    text-align: center;
}

@media (max-width: 980px) {
    nav { display: none; }
    .split,
    .module-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .header-actions .btn-outline { display: none; }
    .lang-switch { padding: 4px 8px; gap: 6px; }
    .logo { font-size: 0.82rem; }
}