/* ============================================================
   register-page.css
   Consolidated from:
   - auth.css
   - auth-register-fix.css
   - register-ui-fix.css
   - register-responsive.css
   ============================================================ */

/* ============================================================
   Source: auth.css
   ============================================================ */

/* ===========================
   Auth Pages Styles
   =========================== */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #e6f4ff 0%, #b3d9ff 50%, #e6f4ff 100%);
    padding: var(--space-sm);
    position: relative;
    overflow: auto;
}

/* 背景パターン */
.auth-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(0, 102, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(0, 79, 196, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.auth-card {
    width: 100%;
    max-width: 800px;
    height: 90vh;
    max-height: 900px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0, 102, 255, 0.1);
    padding: var(--space-md) var(--space-lg);
    margin: auto;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.auth-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--space-xs);
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.auth-form {
    margin-bottom: var(--space-xl);
}

.auth-form .form-group {
    margin-bottom: var(--space-md);
}

.auth-form label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.auth-form input[type="text"],
.auth-form input[type="email"],
.auth-form input[type="password"],
.auth-form input[type="tel"] {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition-base);
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.password-input-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-sm);
}

.password-toggle:hover {
    color: var(--text-primary);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.forgot-link {
    color: var(--primary-color);
    transition: var(--transition-base);
}

.forgot-link:hover {
    text-decoration: underline;
}

.auth-button {
    width: 100%;
    padding: var(--space-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

.auth-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* ゲストボタン */
.guest-button {
    background: var(--secondary-color, #6c757d);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.guest-button:hover {
    background: var(--secondary-dark, #5a6268);
}

/* 区切り線 */
.auth-divider {
    text-align: center;
    margin: var(--space-lg) 0;
    position: relative;
}

.auth-divider span {
    background: white;
    padding: 0 var(--space-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
    z-index: -1;
}

.auth-footer {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--space-md);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition-base);
}

.auth-footer a:hover {
    text-decoration: underline;
}

.auth-back {
    text-align: center;
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-color);
}

.auth-back a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: var(--transition-base);
}

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

/* Error and Success Messages */
.auth-message {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
}

.auth-message.error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.auth-message.success {
    background: #f0fdf4;
    color: #15803d;
    border: 1px solid #bbf7d0;
}

/* Multi-step Registration Form */
.registration-progress {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    width: 100%;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    flex-shrink: 0;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: var(--transition-base);
}

.progress-step.active .step-number {
    background: var(--primary-color);
    color: white;
}

.progress-step.completed .step-number {
    background: var(--secondary-color);
    color: white;
}

.step-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.progress-step.active .step-label {
    color: var(--primary-color);
}

.progress-line {
    width: 40px;
    height: 2px;
    background: var(--border-color);
    margin: 0 var(--space-xs);
    flex-shrink: 0;
}

.form-step {
    display: none;
    position: relative;
}

.form-step.active {
    display: block;
}

/* 4,5ページ目は特別な処理 */
.form-step[data-step="4"].active,
.form-step[data-step="5"].active {
    padding-bottom: 120px;
    height: calc(90vh - 250px);
    display: flex;
    flex-direction: column;
}

.form-step[data-step="4"] > *:not(.form-navigation),
.form-step[data-step="5"] > *:not(.form-navigation) {
    flex-shrink: 0;
}

/* 各ステップの高さを制限 */
.form-step {
    max-height: calc(90vh - 200px);
    overflow-y: auto;
    overflow-x: hidden;
}

.form-step h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.challenges-section {
    margin-bottom: var(--space-xl);
}

.challenge-group {
    margin-bottom: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.challenge-group h4 {
    font-size: 1rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(135deg, #0080ff 0%, #00b4ff 100%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 180, 255, 0.3);
    box-shadow: 0 4px 20px rgba(0, 128, 255, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    position: relative;
    overflow: hidden;
}

.challenge-group h4::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.challenge-group h4 i {
    color: white;
    font-size: 1.125rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.challenge-group .checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
    cursor: pointer;
}

.challenge-group .checkbox-label:last-child {
    margin-bottom: 0;
}

.auth-form select {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: var(--transition-base);
}

.auth-form select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-help {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.form-navigation {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

/* 4,5ページ目のナビゲーション */
.form-step[data-step="4"] .form-navigation,
.form-step[data-step="5"] .form-navigation {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 760px;
    padding: var(--space-lg) var(--space-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    margin-top: 0;
    z-index: 10;
}

.form-navigation button {
    flex: 1;
}

.auth-button-outline {
    width: 100%;
    padding: var(--space-md);
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

.auth-button-outline:hover {
    background: var(--primary-light);
}

/* Responsive */
/* Textarea styles for challenge details */
.auth-form textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition-base);
    resize: vertical;
    min-height: 100px;
    margin-top: var(--space-sm);
}

.auth-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Character count */
.char-count {
    display: block;
    text-align: right;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

/* Required field indicator */
.required {
    color: var(--error-color);
    margin-left: var(--space-xs);
}

@media (max-width: 1024px) {
    .challenges-section {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
}

@media (max-width: 768px) {
    .auth-card {
        max-width: 100%;
        margin: var(--space-md);
    }

    .registration-progress {
        font-size: 0.875rem;
        max-width: 100%;
        padding: 0 var(--space-sm);
    }

    .step-number {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    .step-label {
        font-size: 0.625rem;
    }

    .progress-line {
        width: 25px;
        margin: 0 2px;
    }

    .challenges-section {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .challenge-group {
        padding: var(--space-md);
    }
}

/* Skills and Interests Selection */
.skills-selection-container,
.interests-selection-container {
    margin-bottom: var(--space-lg);
    max-height: 500px;
    overflow-y: auto;
    padding-right: var(--space-sm);
}

.skill-category-section,
.interest-category-section {
    margin-bottom: var(--space-lg);
}

.skill-category-section h4,
.interest-category-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-md);
    padding: var(--space-sm) var(--space-md) var(--space-sm) calc(var(--space-md) + 24px);
    background: linear-gradient(135deg, #0080ff 0%, #00b4ff 100%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 180, 255, 0.3);
    box-shadow: 0 4px 20px rgba(0, 128, 255, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.skill-category-section h4::before,
.interest-category-section h4::before {
    content: '\25C6';
    position: absolute;
    left: var(--space-md);
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.skill-category-section h4::after,
.interest-category-section h4::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 3s infinite;
}

.skills-checkbox-grid,
.interests-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-sm);
}

.skill-checkbox,
.interest-checkbox {
    display: flex;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
}

.skill-checkbox:hover,
.interest-checkbox:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
}

.skill-checkbox input[type="checkbox"],
.interest-checkbox input[type="checkbox"] {
    margin-right: var(--space-sm);
    cursor: pointer;
}

.skill-checkbox input[type="checkbox"]:checked + span,
.interest-checkbox input[type="checkbox"]:checked + span {
    font-weight: 600;
    color: var(--primary-color);
}

.skill-checkbox:has(input:checked),
.interest-checkbox:has(input:checked) {
    background: var(--primary-light);
    border-color: var(--primary-color);
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .skills-checkbox-grid,
    .interests-checkbox-grid {
        grid-template-columns: 1fr;
    }

    .skills-selection-container,
    .interests-selection-container {
        max-height: 400px;
    }

    /* モバイルでのナビゲーション調整 */
    .form-step[data-step="4"] .form-navigation,
    .form-step[data-step="5"] .form-navigation {
        max-width: calc(100% - 40px);
        padding: var(--space-md);
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: var(--space-lg);
        margin: var(--space-sm);
    }

    .step-label {
        display: none;
    }

    .challenge-group {
        padding: var(--space-sm);
    }

    .challenge-group h4 {
        font-size: 0.9375rem;
    }

    .challenge-group .checkbox-label {
        font-size: 0.875rem;
    }

    .auth-form textarea {
        min-height: 80px;
        font-size: 0.875rem;
    }

    .skill-checkbox,
    .interest-checkbox {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.875rem;
    }
}

/* ============================================================
   Source: auth-register-fix.css
   ============================================================ */

/**
 * Auth Register Fix
 * 新規登録ページのレイアウト問題を修正
 */

/* 認証カードの高さ制限を解除 */
.auth-card {
    height: auto !important;
    max-height: none !important;
    min-height: auto !important;
    overflow: visible !important;
}

/* フォームステップの高さ制限を解除 */
.form-step {
    max-height: none !important;
    height: auto !important;
    overflow: visible !important;
}

/* ステップ4,5の特別な高さ設定を無効化 */
.form-step[data-step="4"].active,
.form-step[data-step="5"].active {
    height: auto !important;
    padding-bottom: 20px !important;
}

/* フォームナビゲーションの固定位置を解除 */
.form-step[data-step="4"] .form-navigation,
.form-step[data-step="5"] .form-navigation {
    position: relative !important;
    bottom: auto !important;
    left: auto !important;
    transform: none !important;
    width: 100% !important;
    max-width: none !important;
    margin-top: 40px !important;
}

/* 認証コンテナのパディング調整 */
.auth-container {
    padding: 40px 20px !important;
    min-height: auto !important;
}

/* 進捗インジケーターのマージン調整 */
.registration-progress {
    margin: 30px auto !important;
    max-width: 100% !important;
    padding: 0 15px !important;
}

/* チャレンジセクションのレイアウト改善 */
.challenges-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 30px !important;
}

/* チャレンジグループのスタイル調整 */
.challenge-group {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    border: 1px solid #e9ecef;
}

/* スキル・興味セクションのコンテナ修正 */
.skills-selection-container,
.interests-selection-container {
    max-height: none !important;
    overflow: visible !important;
    padding: 0 !important;
}

/* カテゴリーセクションのマージン調整 */
.skill-category-section,
.interest-category-section {
    margin-bottom: 30px !important;
}

/* チェックボックスグリッドの改善 */
.skills-checkbox-grid,
.interests-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

/* フォームグループのマージン調整 */
.form-group {
    margin-bottom: 20px !important;
}

/* テキストエリアの高さ調整 */
textarea {
    min-height: 100px !important;
    resize: vertical;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .auth-card {
        padding: 30px 20px !important;
        margin: 20px 10px !important;
    }

    .challenges-section {
        gap: 20px;
    }

    .challenge-group {
        padding: 15px;
    }

    .skills-checkbox-grid,
    .interests-checkbox-grid {
        grid-template-columns: 1fr;
    }

    .registration-progress {
        overflow-x: auto;
        padding-bottom: 10px;
    }

    /* プログレスステップの最小幅 */
    .progress-step {
        min-width: 60px;
    }
}

/* タブレット対応 */
@media (min-width: 769px) and (max-width: 1024px) {
    .challenges-section {
        grid-template-columns: repeat(2, 1fr);
    }

    .skills-checkbox-grid,
    .interests-checkbox-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* デスクトップ対応 */
@media (min-width: 1025px) {
    .challenges-section {
        grid-template-columns: repeat(2, 1fr);
    }

    .auth-card:has(.form-step[data-step="2"].active) {
        max-width: 900px !important;
    }
}

/* スクロールバーのスタイル */
.auth-card::-webkit-scrollbar {
    width: 8px;
}

.auth-card::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.auth-card::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.auth-card::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* ボタンの一貫性 */
.auth-button,
.auth-button-outline {
    width: 100%;
    margin-top: 10px;
}

.form-navigation {
    display: flex;
    gap: 10px;
    margin-top: 30px;
}

.form-navigation button {
    flex: 1;
}

/* ============================================================
   Source: register-ui-fix.css
   ============================================================ */

/**
 * 登録ページUI修正
 * 招待リンクから遷移した際の表示問題を解決
 */

/* 文字カウントのスタイル修正 */
.char-count {
    color: #6c757d !important;
    font-size: 0.875rem;
    margin-top: 5px;
    display: block;
}

/* 文字数が不足している場合 */
.char-count.error {
    color: #ef4444 !important;
}

/* 文字数が十分な場合 */
.char-count.success {
    color: #10b981 !important;
}

/* ボタンの無効化スタイルを修正 */
.auth-button:disabled,
.auth-button.disabled {
    opacity: 0.5 !important;
    cursor: not-allowed !important;
    background: #94a3b8 !important;
}

/* ボタンが有効な場合 */
.auth-button:not(:disabled):not(.disabled) {
    opacity: 1 !important;
    cursor: pointer !important;
    background: linear-gradient(135deg, #0066ff 0%, #004fc4 100%) !important;
}

/* フォームナビゲーションボタンの修正 */
.form-navigation .auth-button {
    width: auto;
    flex: 1;
}

/* 紹介情報の表示位置修正 */
.referral-info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 4px 12px rgba(79, 172, 254, 0.3);
    animation: slideIn 0.5s ease-out;
    flex-direction: column;
    text-align: center;
}

@media (min-width: 768px) {
    .referral-info {
        flex-direction: row;
        text-align: left;
    }
}

.referral-info i {
    font-size: 1.5rem;
    opacity: 0.9;
}

.referral-info strong {
    font-weight: 600;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-family: monospace;
}

.referral-info small {
    display: block;
    opacity: 0.9;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* フォーム要素の間隔調整 */
.form-group {
    margin-bottom: 1.5rem;
}

/* チャレンジグループの詳細テキストエリア */
.challenge-group textarea {
    width: 100%;
    margin-top: 1rem;
}

/* チェックボックスラベルのホバー効果 */
.checkbox-label:hover {
    background: #f0f7ff;
    border-radius: 8px;
    transition: background 0.2s ease;
}

/* 必須フィールドマーク */
.required {
    color: #ef4444;
    margin-left: 4px;
}

/* ファイルアップロードエリアの改善 */
.file-upload-wrapper {
    position: relative;
    margin-top: 0.5rem;
}

.file-upload-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 2rem;
    border: 2px dashed #e5e7eb;
    border-radius: 12px;
    background: #f8fafc;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-upload-label:hover {
    border-color: #0066ff;
    background: #f0f7ff;
}

.file-input {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

.file-preview {
    margin-top: 1rem;
    text-align: center;
}

.file-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* アニメーション */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ステップ遷移アニメーション（G1修正） */
.slide-left {
    animation: slideLeft 0.4s ease forwards;
}

.slide-right {
    animation: slideRight 0.4s ease forwards;
}

@keyframes slideLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* エラーメッセージ */
.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.error-message i {
    font-size: 1rem;
}

/* 成功メッセージ */
.success-message {
    color: #10b981;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.success-message i {
    font-size: 1rem;
}

/* プログレスステップの改善 */
.registration-progress {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin: 2rem 0;
    position: relative;
    padding: 0 1rem;
    overflow-x: auto;
    overflow-y: visible;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
    flex-shrink: 0;
    min-width: 70px;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #e5e7eb;
    color: #6c757d;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
}

.progress-step.active .step-number {
    background: #0066ff;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
}

.progress-step.completed .step-number {
    background: #10b981;
    color: white;
}

.step-label {
    font-size: 0.75rem;
    color: #6c757d;
    white-space: nowrap;
}

.progress-line {
    width: 40px;
    height: 2px;
    background: #e5e7eb;
    margin: 0 -5px;
    position: relative;
    top: -24px;
    flex-shrink: 0;
}

/* レスポンシブ調整 */
@media (max-width: 640px) {
    .registration-progress {
        justify-content: flex-start;
        padding: 0 0.5rem 1rem;
        margin: 1.5rem -0.5rem;
    }

    .progress-step {
        min-width: 60px;
    }

    .step-label {
        font-size: 0.625rem;
    }

    .auth-card {
        padding: 30px 20px;
    }

    .auth-title {
        font-size: 1.5rem;
    }
}

/* フォームステップの表示/非表示アニメーション */
.form-step {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.form-step.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* スキル・興味選択のグリッドレイアウト改善 */
.skills-checkbox-grid,
.interests-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.skill-checkbox,
.interest-checkbox {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.skill-checkbox:hover,
.interest-checkbox:hover {
    background: #f0f7ff;
}

.skill-checkbox input[type="checkbox"],
.interest-checkbox input[type="checkbox"] {
    margin-right: 0.5rem;
}

/* カテゴリーセクションのスタイル */
.skill-category-section,
.interest-category-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
}

.skill-category-section h4,
.interest-category-section h4 {
    margin: 0 0 1rem 0;
    color: #1e293b;
    font-size: 1.125rem;
    font-weight: 600;
}

/* フォームオプション（チェックボックス）のスタイル */
.form-options {
    margin: 1rem 0;
}

.form-options .checkbox-label {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.form-options .checkbox-label:hover {
    background: #f0f7ff;
}

.form-options .checkbox-label input[type="checkbox"] {
    margin-right: 0.75rem;
}

/* 利用規約リンク */
.form-options a {
    color: #0066ff;
    text-decoration: none;
    font-weight: 500;
}

.form-options a:hover {
    text-decoration: underline;
}

/* ============================================================
   Source: register-responsive.css
   ============================================================ */

/**
 * 登録ページレスポンシブ対応
 * モバイル・タブレット・デスクトップ対応
 */

/* モバイル対応（640px以下） */
@media (max-width: 640px) {
    /* 認証コンテナ */
    .auth-container {
        padding: 20px 10px !important;
    }

    /* 認証カード */
    .auth-card {
        padding: 30px 20px !important;
        margin: 0 !important;
        border-radius: 20px !important;
    }

    /* ヘッダー */
    .auth-header h1 {
        font-size: 1.5rem !important;
    }

    .auth-title {
        font-size: 1.25rem !important;
        margin-bottom: 20px !important;
    }

    /* プログレスインジケーター */
    .registration-progress {
        overflow-x: auto;
        padding-bottom: 10px;
        margin: 20px -10px;
        padding: 0 10px 10px;
    }

    .progress-step {
        min-width: 50px;
    }

    .step-number {
        width: 30px;
        height: 30px;
        font-size: 0.875rem;
    }

    .step-label {
        font-size: 0.625rem;
    }

    /* フォーム要素 */
    .auth-form input,
    .auth-form textarea,
    .auth-form select {
        padding: 12px 16px !important;
        font-size: 16px !important; /* iOSのズーム防止 */
    }

    /* ボタン */
    .auth-button {
        padding: 14px 24px !important;
        font-size: 1rem !important;
    }

    /* チャレンジセクション */
    .challenges-section {
        gap: 15px !important;
    }

    .challenge-group {
        padding: 15px !important;
    }

    .challenge-group h4 {
        font-size: 1rem !important;
        margin-bottom: 10px !important;
    }

    /* スキル・興味グリッド */
    .skills-checkbox-grid,
    .interests-checkbox-grid {
        grid-template-columns: 1fr !important;
        gap: 8px !important;
    }

    .skill-category-section,
    .interest-category-section {
        padding: 15px !important;
        margin-bottom: 15px !important;
    }

    /* フォームナビゲーション */
    .form-navigation {
        flex-direction: column !important;
        gap: 10px !important;
    }

    .form-navigation button {
        width: 100% !important;
    }

    /* 紹介情報 */
    .referral-info {
        padding: 12px !important;
        font-size: 0.875rem !important;
    }

    .referral-info i {
        font-size: 1.25rem !important;
    }

    /* ファイルアップロード */
    .file-upload-label {
        padding: 1.5rem !important;
        font-size: 0.875rem !important;
    }

    /* SNSボタン */
    .line-button {
        padding: 14px !important;
        font-size: 0.9375rem !important;
    }
}

/* タブレット対応（641px〜1024px） */
@media (min-width: 641px) and (max-width: 1024px) {
    /* 認証カード */
    .auth-card {
        max-width: 600px !important;
        padding: 40px 35px !important;
    }

    /* チャレンジセクション（2列） */
    .challenges-section {
        grid-template-columns: 1fr 1fr !important;
        gap: 20px !important;
    }

    /* スキル・興味グリッド（2列） */
    .skills-checkbox-grid,
    .interests-checkbox-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    /* プログレスステップ */
    .step-label {
        font-size: 0.75rem !important;
    }
}

/* 大画面デスクトップ対応（1025px以上） */
@media (min-width: 1025px) {
    /* ステップ2の特別な幅 */
    .auth-card:has(.form-step[data-step="2"].active) {
        max-width: 1000px !important;
    }

    /* チャレンジセクション（2列） */
    .challenges-section {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 25px !important;
    }

    /* スキル・興味グリッド（3列） */
    .skills-checkbox-grid,
    .interests-checkbox-grid {
        grid-template-columns: repeat(3, 1fr) !important;
    }
}

/* 横向きモバイル対応 */
@media (max-height: 600px) and (orientation: landscape) {
    .auth-container {
        padding: 20px !important;
        min-height: auto !important;
    }

    .auth-card {
        margin: 0 auto !important;
        max-height: 90vh !important;
        overflow-y: auto !important;
    }

    .registration-progress {
        margin: 15px 0 !important;
    }
}

/* タッチデバイス対応 */
@media (hover: none) and (pointer: coarse) {
    /* タッチしやすいボタンサイズ */
    .auth-button,
    .auth-button-outline {
        min-height: 48px !important;
    }

    /* チェックボックスのタッチエリア拡大 */
    .checkbox-label {
        padding: 12px !important;
        margin: 4px 0 !important;
    }

    /* ドロップダウンのタッチエリア */
    .auth-form select {
        min-height: 48px !important;
    }
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
    /* 必要に応じてダークモードスタイルを追加 */
}

/* 印刷対応 */
@media print {
    .auth-container {
        background: white !important;
    }

    .auth-card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }

    .auth-button,
    .form-navigation {
        display: none !important;
    }
}

/* アクセシビリティ対応 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 高コントラストモード対応 */
@media (prefers-contrast: high) {
    .auth-card {
        border: 2px solid currentColor !important;
    }

    .auth-form input,
    .auth-form textarea,
    .auth-form select {
        border-width: 2px !important;
    }
}

/* Retinaディスプレイ対応 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .auth-card {
        border-width: 0.5px !important;
    }
}

/* スクロールバーのカスタマイズ（モバイル） */
@media (max-width: 768px) {
    .auth-card::-webkit-scrollbar {
        width: 4px !important;
    }

    .auth-card::-webkit-scrollbar-thumb {
        background: rgba(0, 0, 0, 0.2) !important;
    }
}

/* フォームステップの高さ調整 */
.form-step {
    min-height: auto !important;
    padding-bottom: 20px !important;
}

/* オーバーフロー処理 */
.auth-card {
    max-height: calc(100vh - 40px) !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch; /* iOSスムーズスクロール */
}

/* フレックスボックスのフォールバック */
.form-navigation {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}

/* グリッドのフォールバック */
.challenges-section {
    display: -ms-grid;
    display: grid;
}

/* iOS Safariの100vh問題対策 */
.auth-container {
    min-height: 100vh;
    min-height: -webkit-fill-available;
}

/* Androidキーボード表示時の対策 */
@media (max-height: 500px) {
    .auth-container {
        min-height: auto !important;
    }
}