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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --accent-color: #58a6ff;
    --error-color: #f85149;
    --warning-color: #d29922;
    --success-color: #3fb950;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent-color), #a371f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.input-section {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

#timeInput {
    flex: 1;
    padding: 16px 20px;
    font-size: 1.1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

#timeInput:focus {
    border-color: var(--accent-color);
}

#nowButton {
    padding: 16px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    background-color: var(--accent-color);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.2s;
}

#nowButton:hover {
    opacity: 0.9;
}

#nowButton:active {
    opacity: 0.8;
}

.examples {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.examples code {
    background-color: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    color: var(--text-primary);
}

.example-time {
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.example-time:hover {
    background-color: var(--accent-color);
    color: var(--bg-primary);
}

.error {
    padding: 16px;
    background-color: rgba(248, 81, 73, 0.1);
    border: 1px solid var(--error-color);
    border-radius: 8px;
    color: var(--error-color);
    margin-bottom: 20px;
}

.dst-warnings {
    padding: 16px;
    background-color: rgba(210, 153, 34, 0.1);
    border: 1px solid var(--warning-color);
    border-radius: 8px;
    margin-bottom: 20px;
}

.dst-warnings h3 {
    color: var(--warning-color);
    margin-bottom: 10px;
    font-size: 1rem;
}

.dst-warnings ul {
    list-style: none;
    color: var(--text-primary);
}

.dst-warnings li {
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.dst-warnings li:before {
    content: "⚠";
    position: absolute;
    left: 0;
    color: var(--warning-color);
}

.hidden {
    display: none;
}

.results {
    display: grid;
    gap: 20px;
}

.result-section {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
}

.result-section h2 {
    font-size: 1.3rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.tz-abbr {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.result-item {
    background-color: var(--bg-tertiary);
    padding: 12px 16px;
    border-radius: 6px;
}

.result-item label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-item .value {
    font-size: 1rem;
    color: var(--text-primary);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    word-break: break-all;
}

footer {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer code {
    background-color: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .input-section {
        flex-direction: column;
    }

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