* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #02070d;
    --panel: rgba(3, 12, 22, 0.82);
    --panel-strong: rgba(2, 9, 17, 0.93);
    --line: rgba(68, 181, 255, 0.34);
    --line-strong: rgba(91, 203, 255, 0.82);
    --text: #edf8ff;
    --muted: #a8bfd0;
    --accent: #4cc8ff;
    --accent-soft: #8cddff;
    --shadow: rgba(0, 152, 255, 0.22);
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    background:
        linear-gradient(rgba(1, 7, 13, 0.62), rgba(1, 7, 13, 0.9)),
        url("studio.jpg") center center / cover fixed no-repeat;
    overflow-x: hidden;
}

a {
    color: inherit;
}

.page-overlay {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(circle at 50% 12%, rgba(37, 159, 230, 0.12), transparent 34%),
        linear-gradient(to bottom, rgba(1, 7, 13, 0.08), rgba(1, 7, 13, 0.48));
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid rgba(73, 188, 255, 0.25);
    background: rgba(1, 7, 13, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.header-inner {
    width: min(1180px, calc(100% - 40px));
    min-height: 78px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.brand {
    display: inline-flex;
    flex-direction: column;
    gap: 4px;
    text-decoration: none;
}

.brand-main {
    color: var(--text);
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.brand-sub {
    color: var(--accent);
    font-size: 0.72rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 22px;
}

.main-nav a {
    color: #d7edf8;
    font-size: 0.88rem;
    letter-spacing: 0.08em;
    text-decoration: none;
    text-transform: uppercase;
    transition: color 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
    color: var(--accent-soft);
    outline: none;
}

main {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    padding: 52px 0 34px;
}

.hero-panel,
.sections-panel,
.about-panel,
.article-hero,
.article-panel {
    border: 1px solid var(--line);
    background: linear-gradient(145deg, rgba(4, 16, 28, 0.88), rgba(2, 8, 15, 0.78));
    box-shadow:
        0 20px 65px rgba(0, 0, 0, 0.38),
        0 0 28px var(--shadow);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.eyebrow {
    margin-bottom: 13px;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.28em;
    text-transform: uppercase;
}

.article-hero {
    min-height: 310px;
    display: grid;
    place-items: center;
    padding: 58px 44px;
    text-align: center;
    border-radius: 18px;
}

.article-hero-content {
    max-width: 900px;
}

.article-hero h1 {
    font-size: clamp(2.35rem, 6vw, 4.7rem);
    line-height: 1.03;
    letter-spacing: 0.025em;
    text-shadow: 0 0 24px rgba(42, 173, 255, 0.34);
}

.article-lead {
    max-width: 780px;
    margin: 26px auto 0;
    color: var(--muted);
    font-size: 1.08rem;
    line-height: 1.78;
}

.article-panel {
    max-width: 940px;
    margin: 34px auto 0;
    padding: 50px 58px;
    border-radius: 18px;
}

.article-section + .article-section {
    margin-top: 38px;
    padding-top: 38px;
    border-top: 1px solid rgba(79, 188, 247, 0.18);
}

.article-section h2 {
    margin-bottom: 16px;
    color: var(--text);
    font-size: clamp(1.55rem, 3vw, 2.05rem);
    line-height: 1.2;
    letter-spacing: 0.02em;
}

.article-section p {
    color: var(--muted);
    font-size: 1.01rem;
    line-height: 1.82;
}

.article-section p + p {
    margin-top: 16px;
}

.article-list {
    margin: 18px 0 0 24px;
    color: var(--muted);
}

.article-list li {
    margin: 10px 0;
    padding-left: 5px;
    line-height: 1.65;
}

.article-list li::marker {
    color: var(--accent);
}

.article-navigation {
    margin-top: 44px;
    padding-top: 32px;
    border-top: 1px solid rgba(79, 188, 247, 0.24);
    display: flex;
    justify-content: flex-start;
}

.secondary-btn {
    display: inline-block;
    padding: 14px 22px;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    background: rgba(3, 19, 32, 0.82);
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-decoration: none;
    text-transform: uppercase;
    box-shadow: 0 0 16px rgba(0, 155, 255, 0.16);
    transition:
        transform 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease;
}

.secondary-btn:hover,
.secondary-btn:focus-visible {
    transform: translateY(-2px);
    background: rgba(6, 36, 58, 0.95);
    box-shadow: 0 0 26px rgba(0, 170, 255, 0.34);
    outline: none;
}

.site-footer {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    padding: 10px 0 34px;
    color: rgba(190, 215, 228, 0.66);
    text-align: center;
    font-size: 0.78rem;
}

@media (max-width: 760px) {
    .header-inner {
        min-height: auto;
        padding: 18px 0;
        align-items: flex-start;
        flex-direction: column;
    }

    .main-nav {
        width: 100%;
        gap: 14px;
        flex-wrap: wrap;
    }

    main {
        width: min(100% - 24px, 1180px);
        padding-top: 28px;
    }

    .article-hero {
        min-height: auto;
        padding: 44px 24px;
    }

    .article-panel {
        padding: 34px 24px;
    }
}