:root {
    color-scheme: dark;
    --bg: #0f172a;
    --surface: #141d2f;
    --surface-soft: #1f2a47;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-strong: #7dd3fc;
    --border: rgba(148, 163, 184, 0.2);
    --shadow: 0 20px 60px rgba(15, 23, 42, 0.4);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.12), transparent 35%),
                linear-gradient(180deg, #0b1122 0%, #0a121f 100%);
    color: var(--text);
}

body {
    line-height: 1.6;
}

img {
    max-width: 100%;
    display: block;
}

.page-shell {
    width: min(1200px, calc(100% - 32px));
    margin: 0 auto;
    padding: 24px 0 64px;
}

.hero-panel {
    display: grid;
    gap: 24px;
    align-items: center;
    padding: 40px 36px;
    border: 1px solid var(--border);
    border-radius: 32px;
    background: rgba(15, 23, 42, 0.92);
    box-shadow: var(--shadow);
}

.hero-banner {
    display: grid;
    gap: 24px;
    padding: 40px 36px;
    border: 1px solid var(--border);
    border-radius: 32px;
    background: rgba(15, 23, 42, 0.92);
    box-shadow: var(--shadow);
}

.hero-banner .hero-copy {
    max-width: 760px;
}

.hero-banner h1 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.6rem);
}

.hero-banner p {
    color: var(--text-muted);
    max-width: 720px;
}

.flag-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 16px;
    justify-content: center;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 24px;
    border: 1px solid rgba(148, 163, 184, 0.14);
}

.country-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 18px;
    background: rgba(148, 163, 184, 0.1);
    font-size: 1.4rem;
}

.calc-grid {
    margin-top: 28px;
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.calc-grid label {
    display: grid;
    gap: 10px;
    color: var(--text-muted);
}

.result-block {
    margin-top: 24px;
    padding: 24px;
    border-radius: 22px;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(56, 189, 248, 0.12);
}

.result-block h3 {
    margin: 0 0 14px;
}

.result-block .result-list {
    display: grid;
    gap: 10px;
}

.result-block .result-item {
    padding: 14px 18px;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.24em;
    color: var(--accent-strong);
    font-size: 0.82rem;
    margin-bottom: 12px;
}

.hero-panel h1 {
    margin: 0;
    font-size: clamp(2.2rem, 3.4vw, 4rem);
    line-height: 1.05;
}

.hero-panel p {
    max-width: 720px;
    color: var(--text-muted);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(15, 23, 42, 0.96);
    border-bottom: 1px solid rgba(148, 163, 184, 0.14);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: min(1200px, calc(100% - 32px));
    margin: 0 auto;
    padding: 16px 0;
}

.brand {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
}

.nav-links a.active,
.nav-links a:hover {
    color: var(--accent-strong);
}

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

.language-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.menu-toggle {
    display: none;
    border: none;
    background: rgba(148, 163, 184, 0.12);
    color: var(--text);
    padding: 10px 14px;
    border-radius: 14px;
    cursor: pointer;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    padding: 14px 22px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #22d3ee, #38bdf8);
    color: #0f172a;
}

.btn-secondary {
    background: rgba(148, 163, 184, 0.12);
    color: var(--text);
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.main-content {
    display: grid;
    gap: 28px;
    margin-top: 32px;
}

.section-card {
    padding: 32px;
    border-radius: 28px;
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.section-header h2 {
    margin: 0 0 10px;
    font-size: 1.85rem;
}

.section-header p {
    margin: 0;
    color: var(--text-muted);
}

.control-grid {
    margin-top: 28px;
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.control-grid label {
    display: grid;
    gap: 10px;
    color: var(--text-muted);
}

.control-grid select,
.control-grid input {
    width: 100%;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.18);
    background: rgba(15, 23, 42, 0.8);
    color: var(--text);
    font-size: 1rem;
}

.control-grid select:focus,
.control-grid input:focus,
.btn:focus {
    outline: 2px solid rgba(56, 189, 248, 0.4);
    outline-offset: 2px;
}

.btn-full {
    grid-column: span 2;
}

.result-card {
    margin-top: 24px;
    padding: 24px;
    border-radius: 22px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(56, 189, 248, 0.15);
}

.result-card.hidden {
    display: none;
}

.result-card h3 {
    margin: 0 0 18px;
    font-size: 1.35rem;
}

.result-list {
    display: grid;
    gap: 10px;
}

.result-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 14px 18px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.04);
}

.result-item span {
    color: var(--text-muted);
}

.result-note {
    margin-top: 14px;
    color: var(--text-muted);
}

.table-wrapper {
    margin-top: 26px;
}

.table-wrapper h3 {
    margin-bottom: 14px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 20px;
    overflow: hidden;
}

th, td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
    font-size: 0.95rem;
}

th {
    color: var(--accent-strong);
    background: rgba(15, 23, 42, 0.96);
}

tbody tr:last-child td {
    border-bottom: none;
}

@media (max-width: 980px) {
    .hero-panel,
    .section-card,
    .page-shell {
        padding-left: 18px;
        padding-right: 18px;
    }

    .control-grid {
        grid-template-columns: 1fr;
    }

    .btn-full {
        grid-column: auto;
    }
}

@media (max-width: 820px) {
    .header-inner {
        flex-wrap: wrap;
        justify-content: space-between;
    }

    .nav-links {
        width: 100%;
        justify-content: center;
    }

    .hero-actions,
    .header-actions {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 720px) {
    .menu-toggle {
        display: inline-flex;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        gap: 12px;
        width: 100%;
        margin-top: 12px;
        background: rgba(15, 23, 42, 0.96);
        padding: 16px;
        border-radius: 20px;
        border: 1px solid rgba(148, 163, 184, 0.16);
    }

    .nav-links.open {
        display: flex;
    }
}

@media (max-width: 560px) {
    .hero-panel,
    .section-card,
    .page-shell {
        padding-left: 14px;
        padding-right: 14px;
    }

    .hero-panel,
    .section-card {
        padding: 24px;
    }
}