:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-tertiary: #80868b;
    --border-color: #dadce0;
    --accent-color: #1a73e8;
    --accent-hover: #1557b0;
    --cyber-green: #00ff41;
    --cyber-blue: #00d9ff;
    --cyber-purple: #b400ff;
    --cyber-pink: #ff00ff;
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 2px 6px 2px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 2px 4px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --button-bg: #1a73e8;
    --button-hover: #1557b0;
    --button-text: #ffffff;
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #00ff41;
    --text-secondary: #00d9ff;
    --text-tertiary: #80ff80;
    --border-color: #00ff41;
    --accent-color: #00ff41;
    --accent-hover: #00d9ff;
    --cyber-green: #00ff41;
    --cyber-blue: #00d9ff;
    --cyber-purple: #b400ff;
    --cyber-pink: #ff00ff;
    --shadow-sm: 0 0 10px rgba(0, 255, 65, 0.3), 0 0 20px rgba(0, 255, 65, 0.1);
    --shadow-md: 0 0 15px rgba(0, 255, 65, 0.4), 0 0 30px rgba(0, 255, 65, 0.2);
    --shadow-lg: 0 0 20px rgba(0, 255, 65, 0.5), 0 0 40px rgba(0, 255, 65, 0.3);
    --button-bg: #00ff41;
    --button-hover: #00d9ff;
    --button-text: #0a0a0a;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

[data-theme="dark"] body {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
    background-attachment: fixed;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* ページヘッダー */
.page-header {
    text-align: center;
    margin-top: 40px;
    margin-bottom: 40px;
    padding: 20px 0;
    position: relative;
}

.site-logo {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    padding: 10px 14px;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: inline-block;
}

.site-logo:hover {
    background: var(--bg-tertiary);
    color: var(--accent-color);
    transform: translateY(-1px);
}

[data-theme="dark"] .site-logo {
    color: var(--cyber-green);
}

[data-theme="dark"] .site-logo:hover {
    background: rgba(0, 255, 65, 0.1);
    color: var(--cyber-blue);
}

.page-title {
    font-family: 'Orbitron', monospace;
    font-size: 3rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 3px;
}

[data-theme="dark"] .page-title {
    color: var(--cyber-green);
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

[data-theme="dark"] .page-subtitle {
    color: var(--cyber-blue);
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 10px 20px;
    border-radius: 24px;
    border: none;
    background-color: #2c3e50;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 500;
    font-family: 'Noto Sans JP', sans-serif;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.theme-toggle:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

[data-theme="dark"] .theme-toggle {
    background-color: var(--cyber-green);
    color: var(--bg-primary);
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.5);
}

[data-theme="dark"] .theme-toggle:hover {
    box-shadow: 0 0 25px rgba(0, 255, 65, 0.8);
}

.theme-text {
    color: inherit;
}

/* メイン時計 */
.main-clock {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 60px 40px;
    margin-bottom: 40px;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
    text-align: center;
}

[data-theme="dark"] .main-clock {
    background: rgba(26, 26, 26, 0.8);
    border: 2px solid var(--cyber-green);
    box-shadow: 0 0 30px rgba(0, 255, 65, 0.3), inset 0 0 30px rgba(0, 255, 65, 0.1);
}

.clock-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.time-main {
    font-family: 'Orbitron', monospace;
    font-size: 6rem;
    font-weight: 900;
    color: var(--text-primary);
    display: flex;
    align-items: baseline;
    gap: 10px;
    line-height: 1;
}

[data-theme="dark"] .time-main {
    color: var(--cyber-green);
}

.time-hours,
.time-minutes,
.time-seconds {
    display: inline-block;
    min-width: 120px;
    text-align: center;
}

.time-separator {
    font-size: 5rem;
    opacity: 0.7;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0.3; }
}

[data-theme="dark"] .time-separator {
    color: var(--cyber-green);
}

.time-date {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-family: 'Orbitron', monospace;
}

[data-theme="dark"] .time-date {
    color: var(--cyber-blue);
}

.time-zone {
    font-size: 1.2rem;
    color: var(--text-tertiary);
    font-family: 'Orbitron', monospace;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .time-zone {
    color: var(--cyber-purple);
    background: rgba(180, 0, 255, 0.1);
    border-color: var(--cyber-purple);
}

/* 情報グリッド */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.info-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

[data-theme="dark"] .info-card {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid var(--cyber-green);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .info-card:hover {
    box-shadow: 0 0 30px rgba(0, 255, 65, 0.4);
    border-color: var(--cyber-blue);
}

.info-card-header {
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

[data-theme="dark"] .info-card-header {
    border-bottom-color: var(--cyber-green);
}

.info-card-header h3 {
    font-family: 'Orbitron', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

[data-theme="dark"] .info-card-header h3 {
    color: var(--cyber-green);
}

.info-card-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-item:last-child {
    border-bottom: none;
}

[data-theme="dark"] .info-item {
    border-bottom-color: rgba(0, 255, 65, 0.2);
}

.info-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

[data-theme="dark"] .info-label {
    color: var(--cyber-blue);
}

.info-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: right;
}

[data-theme="dark"] .info-value {
    color: var(--cyber-green);
}

.status-ok {
    color: var(--cyber-green);
}

.status-syncing {
    color: var(--cyber-blue);
}

.status-warning {
    color: #ffa500;
}

[data-theme="dark"] .status-warning {
    color: #ffaa00;
}

.status-error {
    color: #ff4444;
}

[data-theme="dark"] .status-error {
    color: #ff6666;
}

.sync-button {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    font-family: 'Noto Sans JP', sans-serif;
    transition: all 0.2s ease;
}

.sync-button:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

[data-theme="dark"] .sync-button {
    background-color: rgba(0, 255, 65, 0.1);
    border-color: var(--cyber-green);
    color: var(--cyber-green);
}

[data-theme="dark"] .sync-button:hover {
    background-color: var(--cyber-green);
    color: var(--bg-primary);
    box-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
}

.sync-button:active {
    transform: translateY(0);
}

.sync-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* 世界時計 */
.world-clocks {
    margin-top: 40px;
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .world-clocks {
    background: rgba(26, 26, 26, 0.8);
    border: 1px solid var(--cyber-green);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
}

.section-title {
    font-family: 'Orbitron', monospace;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

[data-theme="dark"] .section-title {
    color: var(--cyber-green);
}

.world-clocks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.world-clock-item {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

[data-theme="dark"] .world-clock-item {
    background: rgba(10, 10, 10, 0.8);
    border: 1px solid var(--cyber-green);
}

.world-clock-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .world-clock-item:hover {
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}

.world-clock-city {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

[data-theme="dark"] .world-clock-city {
    color: var(--cyber-blue);
}

.world-clock-time {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

[data-theme="dark"] .world-clock-time {
    color: var(--cyber-green);
}

.world-clock-zone {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin-top: 4px;
    font-family: 'Orbitron', monospace;
}

[data-theme="dark"] .world-clock-zone {
    color: var(--cyber-purple);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .page-header {
        margin-top: 80px;
        padding-top: 60px;
    }

    .site-logo {
        top: 10px;
        left: 10px;
        font-size: 18px;
        padding: 8px 12px;
    }

    .theme-toggle {
        top: 10px;
        right: 10px;
        padding: 8px 16px;
        font-size: 12px;
    }

    .page-title {
        font-size: 2rem;
    }

    .time-main {
        font-size: 3.5rem;
    }

    .time-hours,
    .time-minutes,
    .time-seconds {
        min-width: 70px;
    }

    .time-separator {
        font-size: 3rem;
    }

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

    .main-clock {
        padding: 40px 20px;
    }

    .world-clocks-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .page-header {
        margin-top: 70px;
        padding-top: 50px;
    }

    .site-logo {
        top: 5px;
        left: 5px;
        font-size: 16px;
        padding: 6px 10px;
    }

    .theme-toggle {
        top: 5px;
        right: 5px;
        padding: 6px 12px;
        font-size: 11px;
    }

    .theme-text {
        display: none;
    }

    .theme-toggle::after {
        content: '🌓';
        font-size: 16px;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .time-main {
        font-size: 2.5rem;
    }

    .time-hours,
    .time-minutes,
    .time-seconds {
        min-width: 50px;
    }

    .time-separator {
        font-size: 2rem;
    }

    .time-date {
        font-size: 1.2rem;
    }
}