/* 全体のリセットと変数定義 */
:root {
    --primary-color: #0f52ba;
    --primary-hover: #0b3d8a;
    --bg-color: #f4f7f9;
    --card-bg: #ffffff;
    --text-main: #333333;
    --text-muted: #666666;
    --border-color: #e0e6ed;
    --success-color: #e6f4ea;
    --success-border: #34a853;
}

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

body {
    background-color: var(--bg-color);
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-main);
    line-height: 1.6;
}

/* ナビゲーションバー共通 */
.top-nav,
.test-nav {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

/* === ホーム画面（ダッシュボード） === */
.dashboard-body .portal-container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.portal-header {
    margin-bottom: 30px;
}

.portal-header h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

.test-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.test-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.test-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.card-image {
    height: 100px;
}

.bg-blue {
    background: linear-gradient(135deg, #4b79a1, #283e51);
}

.bg-green {
    background: linear-gradient(135deg, #56ab2f, #a8e063);
}

.card-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.badge {
    background-color: #e8f0fe;
    color: var(--primary-color);
    font-size: 12px;
    font-weight: bold;
    padding: 4px 8px;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 10px;
}

.card-content h2 {
    font-size: 18px;
    margin-bottom: 8px;
}

.card-content p {
    font-size: 14px;
    color: var(--text-muted);
    flex-grow: 1;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.start-text {
    color: var(--primary-color);
    font-weight: bold;
}

/* === テスト画面共通 === */
.test-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
}

.back-btn {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
}

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

.test-nav-title {
    font-weight: bold;
    font-size: 16px;
}

.test-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

.test-paper {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
}

.student-info {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    background: #f8fafc;
    padding: 20px;
    border-radius: 8px;
}

.info-group {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.info-group label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 5px;
    font-weight: bold;
}

.info-group input {
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 6px;
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s;
}

.info-group input:focus {
    border-color: var(--primary-color);
}

/* プログレスバー */
.progress-container {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    margin-bottom: 30px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* 問題ブロック */
.question-block {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px dashed var(--border-color);
}

.question-title {
    font-size: 17px;
    font-family: 'Noto Serif JP', serif;
    font-weight: bold;
    margin-bottom: 20px;
    line-height: 1.8;
}

/* タップ選択UI (radio / checkbox) */
.choices {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hidden-input {
    display: none;
}

.tap-label {
    display: block;
    padding: 16px 20px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    background-color: #fff;
    transition: all 0.2s ease;
    position: relative;
    padding-left: 50px;
}

.tap-label::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    background-color: #fff;
}

input[type="radio"]+.tap-label::before {
    border-radius: 50%;
}

input[type="checkbox"]+.tap-label::before {
    border-radius: 4px;
}

.tap-label:hover {
    border-color: #b0c4de;
}

.hidden-input:checked+.tap-label {
    background-color: var(--success-color);
    border-color: var(--success-border);
    color: #0b501f;
    font-weight: 500;
}

.hidden-input:checked+.tap-label::before {
    background-color: var(--success-border);
    border-color: var(--success-border);
}

/* 記述式 (textarea) */
.descriptive-input {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 15px;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
}

.descriptive-input:focus {
    border-color: var(--primary-color);
}

/* 穴埋め問題 (fill-in) */
.fill-in-text {
    font-size: 16px;
    line-height: 2.4;
}

.fill-in-input {
    width: 140px;
    margin: 0 8px;
    padding: 4px 8px;
    border: none;
    border-bottom: 2px solid var(--border-color);
    background-color: #f8fafc;
    border-radius: 4px 4px 0 0;
    font-size: 15px;
    text-align: center;
    color: var(--primary-color);
    font-weight: 500;
    outline: none;
    transition: all 0.2s ease;
    font-family: inherit;
}

.fill-in-input:focus {
    border-bottom-color: var(--primary-color);
    background-color: #e8f0fe;
}

/* 長文・複数解答欄 (multi-input) */
.long-text {
    background-color: #f8fafc;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    margin-bottom: 25px;
    font-size: 15px;
    line-height: 1.8;
}

.multi-input-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding-left: 10px;
}

.multi-input-group {
    display: flex;
    align-items: center;
    gap: 15px;
}

.multi-input-group label {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 16px;
    min-width: 50px;
}

.multi-input-group input.descriptive-input {
    padding: 10px 15px;
    flex-grow: 1;
    max-width: 300px;
}

/* 送信ボタンとエラー */
.submit-area {
    text-align: center;
    margin-top: 20px;
}

.submit-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 16px 50px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    box-shadow: 0 4px 10px rgba(15, 82, 186, 0.3);
}

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

.submit-btn:active {
    transform: scale(0.98);
}

.error-msg {
    color: #d93025;
    background: #fce8e6;
    padding: 15px;
    border-radius: 8px;
    font-weight: bold;
    text-align: center;
    margin-top: 20px;
    display: none;
}

/* レスポンシブ調整（スマホ向け） */
@media (max-width: 600px) {
    .nav-container {
        gap: 10px;
        padding: 12px 16px;
    }

    .logo {
        font-size: 18px;
    }

    .user-profile {
        font-size: 13px;
        text-align: right;
    }

    .dashboard-body .portal-container {
        margin: 24px auto;
        padding: 0 16px;
    }

    .portal-header {
        margin-bottom: 20px;
    }

    .portal-header h1 {
        font-size: 21px;
    }

    .portal-header p {
        font-size: 14px;
    }

    .test-list {
        grid-template-columns: minmax(0, 1fr);
        gap: 16px;
    }

    .card-content {
        padding: 16px;
    }

    .card-footer {
        gap: 10px;
        flex-wrap: wrap;
    }

    .test-nav {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        gap: 6px;
        padding: 10px 16px;
    }

    .test-nav-title {
        grid-row: 2;
        font-size: 14px;
        overflow-wrap: anywhere;
    }

    .timer-placeholder {
        display: none;
    }

    .test-container {
        margin: 20px auto;
        padding: 0 12px;
    }

    .test-paper {
        padding: 18px 16px;
        border-radius: 8px;
    }

    .student-info {
        flex-direction: column;
        gap: 15px;
    }

    .info-group input,
    .descriptive-input,
    .fill-in-input {
        font-size: 16px;
    }

    .question-block {
        margin-bottom: 30px;
        padding-bottom: 24px;
    }

    .question-title {
        font-size: 16px;
        margin-bottom: 16px;
    }

    .tap-label {
        min-height: 54px;
        padding: 14px 14px 14px 48px;
    }

    .fill-in-input {
        width: min(140px, 42vw);
        margin: 0 4px;
    }

    .long-text {
        padding: 16px;
        margin-bottom: 20px;
    }

    .multi-input-container {
        padding-left: 0;
    }

    .multi-input-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }

    .multi-input-group input.descriptive-input {
        max-width: 100%;
    }

    .submit-btn {
        width: 100%;
        min-height: 52px;
        padding: 14px 20px;
    }
}