/* CSS変数の定義 */
:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #e2e8f0;
    --accent-color: #10b981;
    --accent-dark: #059669;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --border-color: #d1d5db;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.3);
    --border-radius: 1rem;
    --border-radius-sm: 0.5rem;
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
}

/* Noto Sans JPフォントを適用 */
body {
    font-family: 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, #f0f4f8 0%, var(--secondary-color) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

/* 共通ボタンスタイル */
.btn {
    font-weight: 600;
    padding: 0.75rem 2rem;
    border-radius: 9999px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-dark), #047857);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), var(--danger-dark));
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--danger-dark), #b91c1c);
}

.btn-secondary {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background: #e2e8f0;
}

/* コンテナ */
.container {
    width: 100%;
    max-width: 768px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
}

/* ビデオ要素 */
.video-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    aspect-ratio: 16 / 9;
}

.video-element {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: #1a1a1a;
    border-radius: var(--border-radius);
}

/* メッセージオーバーレイ */
.message-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: 1.125rem;
    border-radius: var(--border-radius);
    transition: opacity 0.3s ease;
    opacity: 0;
    pointer-events: none;
    z-index: 10;
}

.message-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

/* カメラボタングループ */
.camera-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    max-width: 28rem;
    margin: 1rem 0;
}

.camera-btn {
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    background: #e5e7eb;
    color: var(--text-secondary);
}

.camera-btn:hover:not(:disabled) {
    background: #d1d5db;
    transform: scale(1.05);
}

.camera-btn:active {
    transform: scale(0.95);
}

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

.camera-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 入力フィールド */
.input-group {
    position: relative;
    width: 100%;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    font-size: 1rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.input-toggle-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    padding: 0.25rem;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.input-toggle-btn:hover {
    color: var(--text-secondary);
}

/* モーダル */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    max-width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.modal-overlay.show .modal-content {
    transform: translateY(0);
}

/* ローディングスピナー */
.loader {
    border: 4px solid rgba(52, 152, 219, 0.2);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* レスポンシブデザイン */
@media (max-width: 640px) {
    .btn {
        padding: 0.5rem 1.5rem;
        font-size: 0.875rem;
    }
    
    .camera-buttons {
        gap: 0.25rem;
    }
    
    .camera-btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }
}

/* トグルボタン */
.toggle-bg {
    transition: background-color 0.3s ease;
}

#speechToggle:checked + .toggle-bg {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

#speechToggle:checked + .toggle-bg + .toggle-dot {
    transform: translateX(1.25rem);
    background-color: white;
}

.toggle-dot {
    transition: transform 0.3s ease;
}