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

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --background: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
    flex: 1;
}

header {
    text-align: center;
    padding: 2rem 0;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.eye-icon {
    font-size: 3rem;
    animation: blink 3s infinite;
}

@keyframes blink {
    0%, 90%, 100% { transform: scaleY(1); }
    95% { transform: scaleY(0.1); }
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.status-card {
    background: var(--card-background);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.status-indicator.running .status-icon {
    color: var(--success-color);
}

.status-icon {
    font-size: 1.5rem;
}

.timer-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.timer-value {
    font-size: 3rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--primary-color);
}

.timer-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    margin-bottom: 3rem;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-primary.stop {
    background-color: #ef4444;
}

.btn-primary.stop:hover {
    background-color: #dc2626;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
}

.interval-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.interval-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: var(--card-background);
    cursor: pointer;
}

.info-section {
    background: var(--card-background);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.info-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.info-list {
    list-style: none;
}

.info-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.info-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.blink-guide {
    background: linear-gradient(135deg, #e0f2fe 0%, #ddd6fe 100%);
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

.blink-guide h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.blink-guide p {
    color: var(--text-secondary);
}

footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.language-selector {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--card-background);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.lang-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

/* モーダル */
.blink-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 1000;
}

.blink-modal.show {
    opacity: 1;
    pointer-events: auto;
}

.blink-content {
    background: var(--card-background);
    border-radius: 1rem;
    padding: 3rem;
    text-align: center;
    max-width: 400px;
    width: 90%;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.blink-modal.show .blink-content {
    transform: scale(1);
}

.blink-animation {
    font-size: 5rem;
    margin-bottom: 1rem;
    animation: megaBlink 2s infinite;
}

@keyframes megaBlink {
    0%, 45%, 55%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.1); }
}

.blink-content h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.blink-content p {
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

/* レスポンシブ */
@media (max-width: 640px) {
    h1 {
        font-size: 2rem;
    }
    
    .eye-icon {
        font-size: 2.5rem;
    }
    
    .timer-value {
        font-size: 2.5rem;
    }
    
    .controls {
        width: 100%;
    }
    
    .btn-primary {
        width: 100%;
        max-width: 300px;
    }
    
    .interval-control {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .interval-select {
        width: 100%;
    }
}