:root {
    --primary-color: #0056b3;
    --danger-color: #c82333;
    --success-color: #218838;
    --light-color: #f4f7f9;
    --dark-color: #333;
    --background-color: #ffffff;
    --text-color: #333;
    --border-color: #e0e0e0;
    --border-radius: 8px;
    --font-family: "Helvetica Neue", "Arial", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", sans-serif;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 0.7; }
}

body {
    font-family: var(--font-family);
    margin: 0;
    padding: 2rem;
    background-color: var(--light-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

#app {
    width: 100%;
    max-width: 720px;
    background-color: var(--background-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    text-align: center;
}

h1 {
    color: var(--dark-color);
    margin-bottom: 2rem;
    font-weight: 600;
}

.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

label {
    font-weight: 500;
    font-size: 0.95rem;
}

select, button {
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-family: inherit;
    background-color: white;
}

button {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button:hover:not(:disabled) {
    opacity: 0.85;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #6c757d;
    border-color: #6c757d;
}

#startStopBtn .icon {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #fff;
    transition: all 0.2s ease-in-out;
}

#startStopBtn.recording {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

#startStopBtn.recording .icon {
    border-radius: 2px;
}

.status {
    margin-bottom: 1.5rem;
    font-style: italic;
    color: #6c757d;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

#recording-indicator {
    width: 10px;
    height: 10px;
    background-color: var(--danger-color);
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

video {
    width: 100%;
    height: auto;
    background-color: #000;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

#preview {
    margin-bottom: 1.5rem;
}

#results {
    margin-top: 2rem;
    border-top: 1px solid #eee;
    padding-top: 1.5rem;
}

.hidden {
    display: none;
}

h2 {
    color: var(--dark-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.download-buttons {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.download-buttons button {
    background-color: var(--success-color);
    border-color: var(--success-color);
}