:root {
    --page-bg: #09111f;
    --card-bg: rgba(13, 24, 43, 0.92);
    --card-border: rgba(255, 255, 255, 0.12);
    --text-main: #f8fafc;
    --text-muted: #a8b3c7;
    --accent: #55d6be;
    --accent-2: #6ea8fe;
    --danger: #ffb4a2;
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        radial-gradient(circle at top left, rgba(85, 214, 190, 0.18), transparent 32rem),
        radial-gradient(circle at top right, rgba(110, 168, 254, 0.16), transparent 28rem),
        var(--page-bg);
    color: var(--text-main);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.page-shell {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 14px 18px;
}

.hero-card {
    padding: 26px;
    border: 1px solid var(--card-border);
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(15, 30, 52, 0.9));
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

.eyebrow {
    color: var(--accent);
    font-size: 0.94rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.page-title {
    margin: 8px 0 8px;
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 900;
    letter-spacing: -0.05em;
}

.page-subtitle {
    max-width: 680px;
    margin: 0;
    color: var(--text-muted);
    font-size: 1.05rem;
}

.language-box {
    min-width: 180px;
}

.form-label {
    color: #dbeafe;
    font-weight: 700;
}

.form-control,
.form-select {
    min-height: 50px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 18px;
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
}

.form-select option {
    color: #111827;
}

.form-control:focus,
.form-select:focus {
    border-color: rgba(85, 214, 190, 0.85);
    box-shadow: 0 0 0 0.25rem rgba(85, 214, 190, 0.15);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.amount-input {
    min-height: 68px;
    font-size: clamp(1.8rem, 7vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -0.05em;
}

.converter-card {
    padding: 22px;
    border: 1px solid var(--card-border);
    border-radius: 24px;
    background: var(--card-bg);
}

.btn-swap {
    width: 72px;
    height: 72px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #07111f;
    font-size: 1.35rem;
    font-weight: 800;
    box-shadow: 0 14px 34px rgba(85, 214, 190, 0.18);
}

.btn-swap:hover,
.btn-swap:focus {
    color: #07111f;
    transform: translateY(-1px);
}

.result-panel {
    padding: 18px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.07);
}

.result-main {
    font-size: clamp(1.1rem, 3.8vw, 1.65rem);
    font-weight: 800;
    word-break: break-word;
}

.result-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    color: var(--text-muted);
    font-size: 0.94rem;
}

.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.quick-btn {
    border-radius: 999px;
    font-weight: 700;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.info-card {
    display: flex;
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--card-border);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.06);
}

.info-card i {
    color: var(--accent);
    font-size: 1.45rem;
    margin-top: 3px;
}

.info-card h2 {
    margin: 0 0 6px;
    font-size: 1rem;
    font-weight: 900;
}

.info-card p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.94rem;
}

.site-footer {
    max-width: 1180px;
    margin: 0 auto;
    padding: 12px 18px 30px;
    color: var(--text-muted);
    font-size: 0.88rem;
    text-align: center;
}

.alert {
    border-radius: 18px;
}

@media (max-width: 991.98px) {
    .hero-card {
        padding: 18px;
        border-radius: 22px;
    }

    .converter-card {
        padding: 16px;
    }

    .btn-swap {
        width: 100%;
        height: 54px;
        border-radius: 18px;
    }

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

@media (max-width: 575.98px) {
    .page-shell {
        padding: 12px 8px;
    }

    .hero-card {
        padding: 14px;
    }

    .amount-input {
        min-height: 58px;
    }

    .result-panel {
        padding: 14px;
    }
}