/* ===== DESIGN TOKENS ===== */
:root {
    --bg: #000000;
    --fg: #FFFFFF;
    --fg-dim: #999999;
    --border: #FFFFFF;
    --focus-bg: #111111;
    --font: 'Atkinson Hyperlegible', sans-serif;
    --max-w: 740px;
    --gap: 20px;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== BASE ===== */
html { font-size: 18px; }

body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font);
    font-weight: 400;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3 {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.2;
}

h1 { font-size: 2rem; margin-bottom: var(--gap); }
h2 { font-size: 1.25rem; margin-bottom: 8px; }
p { margin-bottom: 10px; }

/* ===== MEGA MENU ===== */
.mega-menu {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0;
    border-bottom: 2px solid var(--border);
}

.mega-menu a {
    color: var(--fg);
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    padding: 16px 24px;
    transition: background 0.15s, color 0.15s;
}

.mega-menu a:hover,
.mega-menu a:focus {
    background: var(--fg);
    color: var(--bg);
}

/* ===== HERO (HOMEPAGE) ===== */
.hero {
    text-align: center;
    padding: 80px var(--gap) 40px;
    max-width: 680px;
    margin: 0 auto;
}

.hero h1 { font-size: 2.5rem; margin-bottom: 32px; }

.search-wrap {
    position: relative;
    max-width: 560px;
    margin: 0 auto;
}

#live-search {
    width: 100%;
    max-width: 100%;
    font-size: 1.1rem;
    padding: 18px 20px;
}

.dropdown {
    display: none;
    position: absolute;
    width: 100%;
    background: var(--bg);
    border: 2px solid var(--border);
    border-top: none;
    z-index: 999;
}

.dropdown a {
    display: block;
    color: var(--fg);
    text-decoration: none;
    padding: 14px 20px;
    font-size: 1rem;
    border-bottom: 1px solid #222;
    transition: background 0.1s, color 0.1s;
}

.dropdown a:last-child { border-bottom: none; }

.dropdown a:hover {
    background: var(--fg);
    color: var(--bg);
}

/* ===== CATEGORY GRID (HOMEPAGE) ===== */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--gap);
    padding: var(--gap);
    max-width: 1000px;
    margin: 0 auto 60px;
}

.category-card {
    display: block;
    text-decoration: none;
    color: var(--fg);
    border: 2px solid var(--border);
    padding: 40px 28px;
    text-align: center;
    transition: background 0.15s, color 0.15s;
}

.category-card:hover {
    background: var(--fg);
    color: var(--bg);
}

.category-card h2 {
    font-size: 1.1rem;
    margin: 0;
}

/* ===== CATEGORY HEADER ===== */
.category-header {
    text-align: center;
    padding: 60px var(--gap) 20px;
    max-width: var(--max-w);
    margin: 0 auto;
}

.category-desc { color: var(--fg-dim); margin-top: 8px; }

/* ===== CALCULATOR LIST (CATEGORY PAGE) ===== */
.calculator-list {
    display: flex;
    flex-direction: column;
    gap: var(--gap);
    max-width: var(--max-w);
    margin: 0 auto;
    padding: var(--gap) var(--gap) 60px;
}

.list-item {
    display: block;
    text-decoration: none;
    color: var(--fg);
    border: 2px solid var(--border);
    padding: 28px;
    transition: background 0.15s, color 0.15s;
}

.list-item:hover {
    background: var(--fg);
    color: var(--bg);
}

.list-item:hover h2,
.list-item:hover p { color: var(--bg); }

.list-item p { color: var(--fg-dim); margin: 0; font-size: 0.9rem; }

/* ===== CALCULATOR PAGE ===== */
.calculator-container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 60px var(--gap) 80px;
}

.calc-desc { color: var(--fg-dim); margin-bottom: 32px; }

/* ===== FORMS ===== */
.input-section { margin-bottom: 40px; }

label {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}

input[type="text"],
input[type="number"],
select {
    display: block;
    width: 100%;
    max-width: 480px;
    background: transparent;
    color: var(--fg);
    border: 2px solid var(--border);
    border-radius: 0;
    padding: 14px 16px;
    font-family: var(--font);
    font-size: 1rem;
    outline: none;
    margin-bottom: var(--gap);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23FFFFFF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 44px;
}

input:focus, select:focus { background: var(--focus-bg); }

/* ===== BUTTONS ===== */
button {
    display: block;
    width: 100%;
    max-width: 480px;
    background: var(--bg);
    color: var(--fg);
    border: 2px solid var(--border);
    border-radius: 0;
    padding: 16px 28px;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.15s, color 0.15s;
}

button:hover, button:focus {
    background: var(--fg);
    color: var(--bg);
}

/* ===== OUTPUT ===== */
.output-section {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 2px solid var(--border);
}

.output-section h2 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    text-transform: none;
}

.error { color: #ff6b6b; }

/* ===== NEXT LINK ===== */
.next-link {
    display: block;
    text-decoration: none;
    color: var(--fg);
    border: 2px solid var(--border);
    padding: 24px;
    margin-top: 40px;
    text-align: center;
    font-weight: 700;
    font-size: 1.05rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    transition: background 0.15s, color 0.15s;
}

.next-link:hover {
    background: var(--fg);
    color: var(--bg);
}

/* ===== FOOTER ===== */
.site-footer {
    text-align: center;
    padding: 24px;
    border-top: 1px solid #222;
    font-size: 0.8rem;
    color: var(--fg-dim);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
    html { font-size: 16px; }
    .hero h1 { font-size: 1.8rem; }
    .mega-menu a { padding: 12px 14px; font-size: 0.7rem; }
    .category-card { padding: 28px 20px; }
    .calculator-container { padding: 40px 16px 60px; }
}