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

:root {
    --bg: #0f1220;
    --panel: #171b2e;
    --text: #f1f4fb;
    --muted: #aab3cc;
    --accent: #ff4d5e;
    --accent-2: #5b8cff;
    --border: rgba(255, 255, 255, 0.09);
    --radius: 14px;
    --font-body: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
}

a { color: var(--accent-2); }

.logo-container { text-align: center; padding: 24px 16px 8px; }
.logo img { max-width: 180px; max-height: 64px; }

header {
    max-width: 860px;
    margin: 0 auto;
    padding: 32px 20px 16px;
    text-align: center;
}

h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); line-height: 1.25; margin-bottom: 16px; }
header p { color: var(--muted); font-size: 1.05rem; }

/* Converter form */
.converter { max-width: 860px; margin: 8px auto 32px; padding: 0 20px; }

.converter-form {
    display: grid;
    grid-template-columns: 1fr 140px auto;
    gap: 12px;
    padding: 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.converter-form input[type="text"],
.converter-form select {
    width: 100%;
    height: 52px;
    padding: 0 14px;
    font: inherit;
    color: var(--text);
    background: #0f1220;
    border: 1px solid var(--border);
    border-radius: 10px;
}

.converter-form input:focus,
.converter-form select:focus { outline: 2px solid var(--accent-2); outline-offset: 1px; }

.cta-button {
    height: 52px;
    padding: 0 28px;
    font: inherit;
    font-weight: 700;
    color: #fff;
    background: var(--accent);
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    transition: filter 0.2s ease;
}
.cta-button:hover { filter: brightness(1.1); }

.converter-note { margin-top: 10px; font-size: 0.85rem; color: var(--muted); text-align: center; }
.converter-error { display: none; margin-top: 10px; color: #ff8a94; text-align: center; font-size: 0.9rem; }
.converter-error.is-visible { display: block; }

/* Content */
.main-content { max-width: 860px; margin: 0 auto; padding: 0 20px 48px; }
.main-content section { padding: 28px 0; border-top: 1px solid var(--border); }
.main-content h2 { font-size: 1.5rem; margin-bottom: 12px; }
.main-content h3 { font-size: 1.15rem; margin: 18px 0 6px; }
.main-content p, .main-content li { color: var(--muted); }
.main-content p + p { margin-top: 10px; }
.main-content ol, .main-content ul { padding-left: 22px; margin: 10px 0; }
.main-content img { max-width: 100%; }

table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 0.95rem; }
th, td { padding: 10px 12px; text-align: left; border: 1px solid var(--border); }
th { background: var(--panel); color: var(--text); }
td { color: var(--muted); }
.table-wrap { overflow-x: auto; }

footer { border-top: 1px solid var(--border); padding: 28px 20px; text-align: center; color: var(--muted); font-size: 0.9rem; }
footer p { max-width: 860px; margin: 6px auto; }

@media (max-width: 680px) {
    .converter-form { grid-template-columns: 1fr; }
    .cta-button { width: 100%; }
}