:root {
    --bg-color: #0f1115;
    --surface-color: #1a1d24;
    --surface-alt: #242830;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent-color: #10b981;
    --border-color: #334155;
    --font-sans: system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header.site-header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--accent-color);
    letter-spacing: 0.05em;
}

.nav-bar nav a, footer nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1.5rem;
    transition: color 0.2s;
}

.nav-bar nav a:hover, footer nav a:hover {
    color: var(--accent-color);
}

.hero-calculator {
    padding: 4rem 0;
    text-align: center;
    background: linear-gradient(180deg, var(--surface-color) 0%, var(--bg-color) 100%);
}

.hero-calculator h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

.calculator-ui {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    text-align: left;
    background: var(--surface-alt);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    min-width: 200px;
}

.input-group label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

input[type="number"], select {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--accent-color);
    font-size: 1.5rem;
    padding: 0.5rem;
    border-radius: 4px;
    font-family: monospace;
    width: 100%;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.time-sig-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.time-sig-inputs .divider {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.results-panel {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.1);
    max-width: 600px;
    margin: 0 auto;
}

.results-panel h2 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.time-display {
    font-family: monospace;
    font-size: 3.5rem;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.time-display .colon, .time-display .dot {
    color: var(--border-color);
    margin: 0 0.2rem;
}

.result-help {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.guide-section, .use-cases {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.guide-section h2, .use-cases h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.guide-section p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.guide-section h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.card h3 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.ad-container {
    margin: 2rem auto;
    text-align: center;
    min-height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
}

footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .calculator-ui {
        flex-direction: column;
    }
    .time-display {
        font-size: 2.5rem;
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    .nav-bar nav a, footer nav a {
        margin: 0 0.5rem;
    }
}


/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}