/* ===== CSS変数定義 ===== */
:root {
    --color-primary: #1e3a5f;
    --color-primary-light: #2a4a73;
    --color-primary-dark: #0f2942;
    --color-secondary: #2a9d8f;
    --color-secondary-light: #3ab8a8;
    --color-accent: #e76f51;
    --color-accent-light: #f08d73;
    --color-background: #fafbfc;
    --color-text: #2d3748;
    --color-text-muted: #718096;
    --color-white: #ffffff;
    --color-border: #e2e8f0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* ===== 基本スタイル ===== */
body {
    background-color: var(--color-background);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* ===== ナビバー ===== */
.navbar-professional {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 0;
}

.navbar-professional .navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-professional .navbar-brand .brand-icon {
    color: var(--color-accent);
    font-size: 1.4rem;
}

.navbar-professional .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    padding: 0.5rem 1rem;
    position: relative;
    transition: color 0.2s ease;
}

.navbar-professional .nav-link:hover,
.navbar-professional .nav-link.active {
    color: var(--color-white);
}

.navbar-professional .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width 0.2s ease;
}

.navbar-professional .nav-link:hover::after,
.navbar-professional .nav-link.active::after {
    width: 80%;
}

/* ===== ボタン ===== */
.btn-professional-primary {
    background: var(--color-primary);
    border: none;
    color: var(--color-white);
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

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

.btn-professional-secondary {
    background: var(--color-secondary);
    border: none;
    color: var(--color-white);
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-professional-secondary:hover {
    background: var(--color-secondary-light);
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-professional-accent {
    background: var(--color-accent);
    border: none;
    color: var(--color-white);
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-professional-accent:hover {
    background: var(--color-accent-light);
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-professional-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    font-weight: 600;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

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

/* ===== カード ===== */
.card-professional {
    background: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.card-professional .card-header {
    background: transparent;
    border-bottom: 1px solid var(--color-border);
    padding: 1.25rem;
}

.card-professional .card-body {
    padding: 1.5rem;
}

/* ===== テストバナー ===== */
.test-banner {
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.test-banner h4 {
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.test-banner p {
    margin-bottom: 0;
    opacity: 0.9;
}

.test-banner .bug-count {
    display: inline-block;
    background: var(--color-accent);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 700;
    margin-left: 0.5rem;
}

/* ===== バグ数バッジ ===== */
.bug-count-badge {
    font-size: 1rem;
    padding: 0.5rem 1rem;
    background: var(--color-accent);
    border: none;
    border-radius: 20px;
}

/* ===== 答え合わせセクション ===== */
.answer-section {
    border-left: 4px solid var(--color-accent);
    padding-left: 1.5rem;
    margin-bottom: 2.5rem;
    background: rgba(231, 111, 81, 0.05);
    padding: 1.5rem;
    padding-left: 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.answer-section h3 {
    color: var(--color-accent);
    font-weight: 700;
    margin-bottom: 1rem;
}

/* ===== コードブロック ===== */
.code-block {
    background: #1a1a2e;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.code-block pre {
    margin: 0;
    color: #e2e8f0;
    font-family: inherit;
}

/* シンタックスハイライト風 */
.code-block .keyword { color: #c792ea; }
.code-block .string { color: #c3e88d; }
.code-block .comment { color: #676e95; font-style: italic; }
.code-block .function { color: #82aaff; }
.code-block .number { color: #f78c6c; }

/* ===== バグコード/正解コード カード ===== */
.bug-found {
    background: rgba(231, 111, 81, 0.06);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-md);
}

.bug-found .card-header {
    background: var(--color-accent);
    color: var(--color-white);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-weight: 600;
}

.correct-code {
    background: rgba(42, 157, 143, 0.06);
    border: 2px solid var(--color-secondary);
    border-radius: var(--radius-md);
}

.correct-code .card-header {
    background: var(--color-secondary);
    color: var(--color-white);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-weight: 600;
}

/* ===== 学びのポイント ===== */
.learning-points {
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    margin-top: 2rem;
}

.learning-points h4 {
    color: var(--color-white);
    font-weight: 700;
    margin-bottom: 1rem;
}

.learning-points ul {
    margin-bottom: 0;
}

.learning-points li {
    margin-bottom: 0.5rem;
    padding-left: 0.5rem;
}

.learning-points li:last-child {
    margin-bottom: 0;
}

.learning-points strong {
    color: var(--color-secondary-light);
}

/* ===== フッター ===== */
.footer-professional {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-professional a {
    color: var(--color-secondary-light);
    text-decoration: none;
}

.footer-professional a:hover {
    color: var(--color-white);
}

/* ===== フォーム要素 ===== */
.form-control:focus,
.form-select:focus {
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 0.2rem rgba(42, 157, 143, 0.25);
}

/* ===== アラート系 ===== */
.alert-professional {
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
}

/* ===== ユーティリティ ===== */
.text-primary-custom { color: var(--color-primary); }
.text-secondary-custom { color: var(--color-secondary); }
.text-accent { color: var(--color-accent); }
.bg-primary-custom { background-color: var(--color-primary); }
.bg-secondary-custom { background-color: var(--color-secondary); }
.bg-accent { background-color: var(--color-accent); }

/* ===== トップページ用 ===== */
.hero-section {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 3rem 0;
    margin-bottom: 2rem;
    margin-top: -1.5rem;
}

.hero-section h1 {
    font-weight: 800;
    margin-bottom: 1rem;
}

.hero-section .lead {
    opacity: 0.9;
    font-size: 1.1rem;
}

.test-card {
    background: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    height: 100%;
}

.test-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.test-card .card-body {
    padding: 1.75rem;
}

.test-card .icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--color-white);
}

.test-card h5 {
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.test-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.hint-card {
    background: rgba(42, 157, 143, 0.08);
    border: 1px solid rgba(42, 157, 143, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.hint-card h5 {
    color: var(--color-secondary);
    font-weight: 700;
}

/* ===== レスポンシブ調整 ===== */
@media (max-width: 768px) {
    .test-banner {
        padding: 1rem;
    }

    .answer-section {
        padding: 1rem;
        padding-left: 1rem;
    }

    .code-block {
        font-size: 0.8rem;
        padding: 1rem;
    }

    .hero-section {
        padding: 2rem 0;
    }
}