:root {
    --bg: #070d16;
    --bg-2: #0b1320;
    --panel: rgba(16, 25, 39, 0.82);
    --panel-2: rgba(22, 34, 52, 0.92);
    --line: rgba(148, 180, 220, 0.18);
    --text: #edf5ff;
    --muted: #9ba9ba;
    --blue: #2f8cff;
    --blue-2: #79b8ff;
    --danger: #ff5f70;
    --success: #42d392;
    --radius: 20px;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: Inter, Segoe UI, Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 70% 15%, rgba(47, 140, 255, 0.22), transparent 35%),
        radial-gradient(circle at 20% 20%, rgba(255, 122, 47, 0.08), transparent 25%),
        linear-gradient(180deg, #050911, var(--bg) 35%, #060b13);
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 16px 5vw;
    background: rgba(5, 10, 18, 0.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 12px; min-width: 210px; }
.brand-logo { width: 48px; height: 48px; }
.brand-text { font-weight: 900; text-transform: uppercase; line-height: 0.9; letter-spacing: 1.4px; }

.main-nav { display: flex; align-items: center; gap: 22px; flex: 1; }
.main-nav a {
    color: var(--muted);
    font-weight: 700;
    padding: 10px 2px;
    border-bottom: 2px solid transparent;
}
.main-nav a:hover, .main-nav a.active { color: var(--text); border-color: var(--blue); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.small-link { color: var(--muted); font-weight: 700; }
.small-link:hover { color: var(--text); }
.burger { display: none; background: transparent; border: 1px solid var(--line); color: var(--text); border-radius: 10px; padding: 8px 12px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: 1px solid transparent;
    border-radius: 12px;
    padding: 12px 18px;
    font-weight: 800;
    cursor: pointer;
    transition: 0.18s ease;
}
.btn-primary {
    background: linear-gradient(135deg, #1673df, #2f8cff);
    color: white;
    box-shadow: 0 10px 28px rgba(47, 140, 255, 0.24);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 42px rgba(47, 140, 255, 0.34); }
.btn-outline { color: var(--text); border-color: rgba(160, 190, 230, 0.35); background: rgba(255,255,255,0.03); }
.btn-outline:hover { border-color: var(--blue); background: rgba(47, 140, 255, 0.10); }
.btn-large { padding: 15px 24px; font-size: 16px; }

.page-shell { width: min(1440px, 92vw); margin: 0 auto; padding: 34px 0 70px; }

.hero {
    display: grid;
    grid-template-columns: 0.9fr 1.35fr;
    gap: 34px;
    align-items: center;
    min-height: 620px;
    padding: 34px;
    border: 1px solid var(--line);
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(11,19,32,0.94), rgba(8,14,24,0.76));
    box-shadow: var(--shadow);
    overflow: hidden;
    position: relative;
}
.hero::before {
    content: "";
    position: absolute;
    inset: auto -10% -50% 30%;
    height: 420px;
    background: radial-gradient(circle, rgba(47,140,255,.18), transparent 65%);
    pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.eyebrow { color: var(--blue-2); text-transform: uppercase; letter-spacing: 1.8px; font-weight: 900; font-size: 12px; }
.hero h1, .page-title h1 { margin: 12px 0 16px; font-size: clamp(42px, 7vw, 92px); line-height: 0.95; letter-spacing: -3px; }
.hero p, .page-title p { color: var(--muted); font-size: 20px; line-height: 1.6; max-width: 650px; }
.hero-buttons { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 34px; }
.hero-image-card {
    position: relative;
    z-index: 1;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--line);
    box-shadow: 0 26px 70px rgba(0,0,0,.48);
}
.hero-image-card img { width: 100%; height: 520px; object-fit: cover; object-position: center; }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 22px 0 50px; }
.stats-grid div {
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(16, 25, 39, 0.72);
    padding: 22px;
    text-align: center;
}
.stats-grid strong { display: block; font-size: 28px; color: var(--text); }
.stats-grid span { color: var(--muted); }
.stats-grid.compact { grid-template-columns: repeat(2, 1fr); margin: 18px 0 0; }

.section-head, .page-title {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin: 42px 0 20px;
}
.page-title { display: block; }
.section-head h2, .page-title h1 { margin-bottom: 4px; }
.section-head a { color: var(--blue-2); font-weight: 800; }

.cards-grid { display: grid; gap: 18px; }
.cards-grid.three { grid-template-columns: repeat(3, 1fr); }
.card, .panel, .feature-card {
    border: 1px solid var(--line);
    background: linear-gradient(180deg, var(--panel-2), rgba(10, 17, 28, 0.86));
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 14px 44px rgba(0,0,0,.22);
}
.card { min-height: 210px; }
.card h3, .panel h2, .panel h3, .feature-card h3 { margin: 12px 0 10px; }
.card p, .panel p, .feature-card p, .meta-line, .tank-stats { color: var(--muted); line-height: 1.55; }
.tag { color: var(--blue-2); font-size: 12px; font-weight: 900; text-transform: uppercase; letter-spacing: 1px; }
.price-line { display: flex; align-items: center; gap: 12px; margin: 16px 0; }
.price-line del { color: #778599; }
.price-line strong { color: var(--blue-2); font-size: 22px; }
.meta-line, .tank-stats { display: grid; gap: 6px; margin-top: 18px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 22px; }
.feature-card { position: relative; overflow: hidden; min-height: 190px; }
.feature-card::after {
    content: "";
    position: absolute;
    right: -50px;
    bottom: -70px;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(47,140,255,.16), transparent 70%);
}
.feature-icon { font-size: 34px; color: var(--blue); }

.split-grid { display: grid; grid-template-columns: 1.4fr 0.8fr; gap: 18px; }
.big-panel { min-height: 260px; }
.clean-list { color: var(--muted); line-height: 2; padding-left: 20px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--blue-2); text-transform: uppercase; font-size: 12px; letter-spacing: 1px; }
td { color: var(--muted); }

.form-panel { max-width: 760px; }
.form-panel label { display: grid; gap: 8px; color: var(--muted); margin-bottom: 16px; font-weight: 700; }
input, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(0,0,0,.22);
    color: var(--text);
    padding: 14px 16px;
    outline: none;
    font: inherit;
}
input:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(47,140,255,.12); }
.auth-wrap { min-height: 65vh; display: grid; place-items: center; }
.auth-panel { width: min(520px, 100%); }
.auth-panel h1 { margin: 10px 0 24px; }

.alert { margin: 0 0 18px; padding: 14px 18px; border-radius: 14px; border: 1px solid var(--line); }
.alert.success { color: var(--success); background: rgba(66, 211, 146, .09); }
.alert.error { color: var(--danger); background: rgba(255, 95, 112, .09); }

.site-footer {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 34px 5vw;
    border-top: 1px solid var(--line);
    color: var(--muted);
    background: rgba(5, 10, 18, 0.72);
}
.footer-links { display: flex; gap: 18px; font-weight: 800; }
.footer-links a:hover { color: var(--text); }

@media (max-width: 1100px) {
    .hero { grid-template-columns: 1fr; }
    .hero-image-card img { height: 360px; }
    .cards-grid.three, .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 820px) {
    .site-header { flex-wrap: wrap; }
    .burger { display: inline-flex; margin-left: auto; }
    .main-nav { display: none; flex-basis: 100%; flex-direction: column; align-items: flex-start; }
    .main-nav.open { display: flex; }
    .header-actions { width: 100%; justify-content: flex-start; flex-wrap: wrap; }
    .hero { padding: 22px; min-height: auto; }
    .cards-grid.three, .feature-grid, .split-grid, .stats-grid { grid-template-columns: 1fr; }
    .site-footer { flex-direction: column; }
}

select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(0,0,0,.28);
    color: var(--text);
    padding: 14px 16px;
    outline: none;
    font: inherit;
}
select:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(47,140,255,.12); }
.muted { color: var(--muted); line-height: 1.55; }
.alert.info { color: var(--blue-2); background: rgba(47,140,255,.09); }
.nation-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 24px 0; }
.nation-tab {
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 18px;
    background: rgba(15, 25, 40, .72);
    display: grid;
    gap: 8px;
}
.nation-tab strong { color: var(--text); font-size: 20px; }
.nation-tab span { color: var(--muted); line-height: 1.4; }
.nation-tab.active { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(47,140,255,.12); }
.tech-tree-wrap { margin-top: 26px; }
.tech-tree-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 20px; background: rgba(6, 12, 22, .72); padding: 18px; }
.tech-tree { min-width: 1800px; display: grid; grid-template-columns: repeat(10, minmax(170px, 1fr)); gap: 16px; align-items: start; }
.tier-column { display: grid; gap: 12px; position: relative; }
.tier-label { text-align: center; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.tree-node {
    display: grid;
    gap: 6px;
    min-height: 132px;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 14px;
    background: linear-gradient(180deg, rgba(24,36,54,.92), rgba(9,15,25,.86));
    position: relative;
}
.tree-node::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -17px;
    width: 17px;
    height: 1px;
    background: rgba(255,255,255,.18);
}
.tier-column:last-child .tree-node::after { display: none; }
.tree-node strong { color: var(--text); }
.tree-node small, .tree-node em, .tree-node .cost { color: var(--muted); font-style: normal; }
.tree-node.locked { opacity: .58; filter: grayscale(.35); }
.tree-node.unlocked { border-color: rgba(255,199,95,.65); }
.tree-node.purchased { border-color: rgba(66,211,146,.75); box-shadow: 0 0 0 3px rgba(66,211,146,.08); }
.node-tier { color: var(--blue-2); font-size: 12px; font-weight: 900; text-transform: uppercase; }
.premium-card { background: linear-gradient(180deg, rgba(45,34,16,.88), rgba(12,17,26,.92)); border-color: rgba(255,199,95,.34); }
.premium-tag { color: #ffc75f; }
.tag.ok { color: var(--success); }
.tag.warn { color: #ffc75f; }
.tag.danger { color: var(--danger); }
.vehicle-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.tank-silhouette { color: rgba(255,255,255,.78); font-size: 60px; letter-spacing: -8px; padding: 30px 0; text-align: center; text-shadow: 0 0 30px rgba(47,140,255,.45); }
.tank-silhouette.large { font-size: 96px; padding: 46px 0; }
.vehicle-stats { grid-template-columns: repeat(5, 1fr); }
.hangar-screen { display: grid; grid-template-columns: .85fr 1.6fr .85fr; gap: 18px; align-items: stretch; }
.hangar-center { text-align: center; min-height: 430px; background: radial-gradient(circle at center, rgba(47,140,255,.12), rgba(10,16,26,.92) 58%); }
.hangar-actions { display: flex; gap: 12px; justify-content: center; margin-top: 18px; flex-wrap: wrap; }
.task-list { padding-left: 0; list-style: none; }
.task-list li { display: grid; gap: 4px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.task-list span { color: var(--muted); }
.bar-stat { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.bar-stat strong { color: var(--text); }
.selected-card { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(47,140,255,.12); }
@media (max-width: 1100px) {
    .nation-tabs, .hangar-screen { grid-template-columns: 1fr; }
    .vehicle-stats { grid-template-columns: repeat(2, 1fr); }
}

/* Registration nation selector */
.field-label {
    display: block;
    margin: 10px 0 8px;
    color: var(--text);
    font-weight: 700;
}
.register-nations {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin: 8px 0 18px;
}
.nation-choice {
    position: relative;
    cursor: pointer;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 16px;
    background: linear-gradient(180deg, rgba(15, 25, 40, .86), rgba(8, 13, 22, .92));
    display: grid;
    gap: 8px;
    min-height: 150px;
    transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.nation-choice input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}
.nation-choice strong {
    color: var(--text);
    font-size: 20px;
    position: relative;
    z-index: 1;
}
.nation-choice span,
.nation-choice em {
    color: var(--muted);
    line-height: 1.45;
    position: relative;
    z-index: 1;
}
.nation-choice em {
    font-style: normal;
    font-size: 13px;
    color: var(--blue-2);
}
.nation-choice:hover,
.nation-choice.selected,
.nation-choice:has(input:checked) {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(47,140,255,.16), 0 18px 50px rgba(0,0,0,.22);
    transform: translateY(-1px);
}
.nation-choice.selected::after,
.nation-choice:has(input:checked)::after {
    content: "Выбрано";
    position: absolute;
    right: 12px;
    top: 12px;
    padding: 4px 8px;
    border-radius: 999px;
    background: rgba(47,140,255,.22);
    color: var(--blue-2);
    font-size: 12px;
    font-weight: 700;
}
select option {
    background: #0b1320;
    color: #eaf2ff;
}
@media (max-width: 820px) {
    .register-nations { grid-template-columns: 1fr; }
}