/* ================================================================
   国家資格CBT模擬試験 - メインスタイルシート
   ================================================================ */

/* ----------------------------------------------------------------
   リセット・ベース
   ---------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --info: #0891b2;
    --info-light: #cffafe;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
    color: var(--gray-800);
    background-color: var(--gray-50);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

/* ----------------------------------------------------------------
   レイアウト
   ---------------------------------------------------------------- */
.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1rem;
}

.site-main {
    flex: 1;
    padding: 2rem 0;
}

/* ----------------------------------------------------------------
   ヘッダー
   ---------------------------------------------------------------- */
.site-header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
}

.site-logo:hover {
    text-decoration: none;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-link {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.nav-user {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ----------------------------------------------------------------
   フッター
   ---------------------------------------------------------------- */
.site-footer {
    background: var(--gray-800);
    color: var(--gray-400);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.875rem;
    margin-top: auto;
}

/* ----------------------------------------------------------------
   ボタン
   ---------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
    line-height: 1.4;
}

.btn:hover {
    text-decoration: none;
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.0625rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    color: #fff;
}

.btn-outline {
    border-color: var(--gray-300);
    background: #fff;
    color: var(--gray-700);
}

.btn-outline:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover {
    background: #15803d;
    color: #fff;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background: #b91c1c;
    color: #fff;
}

/* ----------------------------------------------------------------
   カード
   ---------------------------------------------------------------- */
.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.card + .card {
    margin-top: 1rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--gray-900);
}

/* ----------------------------------------------------------------
   アラート
   ---------------------------------------------------------------- */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.alert-success {
    background: var(--success-light);
    color: #166534;
}

.alert-danger {
    background: var(--danger-light);
    color: #991b1b;
}

.alert-info {
    background: var(--info-light);
    color: #155e75;
}

.alert-warning {
    background: var(--warning-light);
    color: #92400e;
}

/* ----------------------------------------------------------------
   フォーム
   ---------------------------------------------------------------- */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.375rem;
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-size: 0.9375rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: #fff;
    color: var(--gray-800);
    transition: border-color 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* ----------------------------------------------------------------
   トップページ
   ---------------------------------------------------------------- */
.hero {
    text-align: center;
    padding: 3rem 1rem;
}

.hero-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--gray-500);
    margin-bottom: 2rem;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.cert-card {
    background: #fff;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: left;
    transition: all 0.2s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.cert-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    transform: translateY(-2px);
}

.cert-card-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.cert-card-desc {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 0.75rem;
}

.cert-card-meta {
    font-size: 0.8125rem;
    color: var(--gray-400);
}

/* ----------------------------------------------------------------
   学習メニュー
   ---------------------------------------------------------------- */
.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.menu-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: #fff;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

.menu-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.menu-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.menu-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
}

.menu-card-desc {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* ----------------------------------------------------------------
   テスト設定
   ---------------------------------------------------------------- */
.setting-section {
    margin-bottom: 2rem;
}

.setting-section-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.option-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.option-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius);
    background: #fff;
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: all 0.15s ease;
}

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

.option-btn.selected {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}

.option-btn input[type="radio"] {
    display: none;
}

/* ----------------------------------------------------------------
   テスト画面（CBT）
   ---------------------------------------------------------------- */
.exam-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 50;
}

.exam-progress {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

.exam-timer {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    font-variant-numeric: tabular-nums;
}

.exam-timer.warning {
    color: var(--warning);
}

.exam-timer.danger {
    color: var(--danger);
    animation: blink 1s infinite;
}

@keyframes blink {
    50% { opacity: 0.5; }
}

.exam-body {
    max-width: 768px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.question-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.question-text {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.choice-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.choice-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s ease;
}

.choice-item:hover {
    border-color: var(--primary);
    background: var(--gray-50);
}

.choice-item.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}

.choice-item.correct {
    border-color: var(--success);
    background: var(--success-light);
}

.choice-item.incorrect {
    border-color: var(--danger);
    background: var(--danger-light);
}

.choice-item input[type="radio"] {
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.choice-label {
    flex: 1;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.exam-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

.flag-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: #fff;
    color: var(--gray-600);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.flag-btn:hover {
    background: var(--gray-100);
}

.flag-btn.flagged {
    border-color: var(--warning);
    background: var(--warning-light);
    color: #92400e;
}

/* ナビゲーター */
.navigator {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1rem;
    margin-top: 1.5rem;
}

.navigator-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray-500);
    margin-bottom: 0.75rem;
}

.navigator-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.nav-item {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--gray-300);
    background: #fff;
    color: var(--gray-600);
    transition: all 0.1s ease;
}

.nav-item:hover {
    border-color: var(--primary);
}

.nav-item.current {
    border-color: var(--primary);
    background: var(--primary);
    color: #fff;
}

.nav-item.answered {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.nav-item.flagged {
    border-color: var(--warning);
    background: var(--warning-light);
    color: #92400e;
}

/* 解説 */
.explanation {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: var(--info-light);
    border-radius: var(--radius);
    border-left: 4px solid var(--info);
}

.explanation-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: #155e75;
    margin-bottom: 0.5rem;
}

.explanation-text {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ----------------------------------------------------------------
   結果画面
   ---------------------------------------------------------------- */
.result-hero {
    text-align: center;
    padding: 2rem;
    margin-bottom: 2rem;
}

.result-score {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1;
}

.result-score .unit {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-500);
}

.result-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: 0.5rem;
}

.result-pass {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.375rem 1rem;
    border-radius: 999px;
    font-size: 0.9375rem;
    font-weight: 700;
}

.result-pass.pass {
    background: var(--success-light);
    color: #166534;
}

.result-pass.fail {
    background: var(--danger-light);
    color: #991b1b;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.stat-card {
    text-align: center;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

.category-results {
    margin: 2rem 0;
}

.category-bar {
    margin-bottom: 1rem;
}

.category-bar-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.375rem;
    font-size: 0.875rem;
}

.category-bar-name {
    font-weight: 600;
    color: var(--gray-700);
}

.category-bar-score {
    font-weight: 600;
    color: var(--gray-900);
}

.bar-track {
    height: 0.5rem;
    background: var(--gray-200);
    border-radius: 999px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 999px;
    transition: width 0.5s ease;
}

.bar-fill.low {
    background: var(--danger);
}

.bar-fill.mid {
    background: var(--warning);
}

.bar-fill.high {
    background: var(--success);
}

/* ----------------------------------------------------------------
   選択リスト
   ---------------------------------------------------------------- */
.select-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.select-list-item {
    display: block;
    padding: 1rem 1.25rem;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    transition: all 0.15s ease;
}

.select-list-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
    text-decoration: none;
}

.select-list-title {
    font-weight: 600;
    color: var(--gray-900);
}

.select-list-meta {
    font-size: 0.8125rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
}

/* ----------------------------------------------------------------
   レスポンシブ
   ---------------------------------------------------------------- */
@media (max-width: 640px) {
    .hero-title {
        font-size: 1.375rem;
    }

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

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

    .exam-header {
        padding: 0.5rem 0.75rem;
        gap: 0.5rem;
        font-size: 0.8125rem;
    }

    .exam-body {
        padding: 1.25rem 0.75rem;
    }

    .question-text {
        font-size: 0.9375rem;
    }

    .choice-item {
        padding: 0.75rem;
    }

    .choice-label {
        font-size: 0.875rem;
    }

    .result-score {
        font-size: 2.5rem;
    }

    .result-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .exam-actions {
        flex-direction: column;
        gap: 0.75rem;
    }

    .exam-actions .btn {
        width: 100%;
    }

    .option-grid {
        flex-direction: column;
    }

    .option-btn {
        width: 100%;
    }

    .site-logo {
        font-size: 0.9375rem;
    }

    .site-nav {
        gap: 0.5rem;
    }

    .page-title {
        font-size: 1.25rem;
    }

    .navigator {
        padding: 0.75rem;
    }

    .nav-item {
        width: 1.75rem;
        height: 1.75rem;
        font-size: 0.6875rem;
    }

    .category-bar-header {
        flex-direction: column;
        gap: 0.125rem;
    }
}