/* ==========================================================================
   QRコード生成アプリ スタイルシート (style.css)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. テーマ変数 & デザインシステム
   -------------------------------------------------------------------------- */
:root {
    /* カラーパレット (Light Mode) */
    --bg-main: #f4f6f9;
    --bg-card: #ffffff;
    --bg-sub: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    /* アクセントカラー */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-success: #16a34a;
    --color-success-hover: #15803d;
    --color-info: #0284c7;
    --color-info-hover: #0369a1;
    --color-danger: #dc2626;
    --color-warning-bg: #fffbeeb0;
    --color-warning-border: #fde047;
    --color-warning-text: #854d0e;

    /* シャドウ & 角丸 */
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
    --btn-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
    --border-radius: 12px;
    --border-radius-sm: 8px;

    /* トランジション */
    --transition-fast: 0.2s ease;
}

/* Dark Mode カラー設定 */
[data-theme="dark"] {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-sub: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --color-warning-bg: #422006;
    --color-warning-border: #a16207;
    --color-warning-text: #fef08a;
}

/* --------------------------------------------------------------------------
   2. 基本スタイル & リセット
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans JP", sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* アクセシビリティ: フォーカスリング */
:focus-visible {
    outline: 3px solid var(--color-primary) !important;
    outline-offset: 2px !important;
}

/* --------------------------------------------------------------------------
   3. ヘッダー & フッター
   -------------------------------------------------------------------------- */
.app-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
}

.header-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.app-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.app-title i {
    color: var(--color-primary);
}

.theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-sub);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
    background-color: var(--border-color);
}

.app-footer {
    text-align: center;
    padding: 24px;
    margin-top: auto;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* --------------------------------------------------------------------------
   4. メインレイアウト & カード
   -------------------------------------------------------------------------- */
.main-content {
    flex: 1;
    padding: 32px 16px;
    display: flex;
    justify-content: center;
}

.card-container {
    background-color: var(--bg-card);
    width: 100%;
    max-width: 760px;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 32px;
    border: 1px solid var(--border-color);
}

/* プライバシーバナー */
.privacy-notice {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: var(--bg-sub);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.privacy-notice i {
    color: var(--color-success);
    font-size: 1.1rem;
}

/* アラートバナー */
.alert-banner {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.warning-banner {
    background-color: var(--color-warning-bg);
    border: 1px solid var(--color-warning-border);
    color: var(--color-warning-text);
}

.error-banner {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: var(--color-danger);
}

/* --------------------------------------------------------------------------
   5. タブ切り替え
   -------------------------------------------------------------------------- */
.type-tabs {
    display: flex;
    gap: 8px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 24px;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 16px;
    border: none;
    background: none;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    bottom: -2px;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   6. フォーム要素
   -------------------------------------------------------------------------- */
.qr-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.required-badge {
    background-color: var(--color-danger);
    color: #ffffff;
    font-size: 0.72rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 6px;
    vertical-align: middle;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* パスワード入力用 */
.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper .form-input {
    padding-right: 48px;
}

.password-toggle-btn {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 8px;
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.form-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.error-message {
    color: var(--color-danger);
    font-size: 0.85rem;
    min-height: 1.2em;
}

/* --------------------------------------------------------------------------
   7. アコーディオン & カスタマイズオプション
   -------------------------------------------------------------------------- */
.customize-accordion {
    margin-top: 24px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-sub);
    overflow: hidden;
}

.accordion-header {
    padding: 16px 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
}

.accordion-header::-webkit-details-marker {
    display: none;
}

.accordion-content {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
}

.form-color {
    width: 100%;
    height: 44px;
    padding: 4px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    cursor: pointer;
    background-color: var(--bg-card);
}

.advanced-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border-color);
}

/* --------------------------------------------------------------------------
   8. ボタン
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
    box-shadow: var(--btn-shadow);
}

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

.btn-secondary {
    background-color: var(--bg-sub);
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

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

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

.btn-info {
    background-color: var(--color-info);
    color: #ffffff;
}

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

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--bg-sub);
}

.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.action-buttons .btn-primary {
    flex: 2;
}

.action-buttons .btn-secondary {
    flex: 1;
}

/* --------------------------------------------------------------------------
   9. プレビュー & 保存
   -------------------------------------------------------------------------- */
.preview-section {
    margin-top: 36px;
    padding-top: 28px;
    border-top: 2px solid var(--border-color);
}

.preview-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.preview-box {
    background-color: var(--bg-sub);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.preview-placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
    opacity: 0.4;
}

.qr-output-container {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 100%;
}

.qr-canvas {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    background-color: #ffffff;
}

.preview-actions {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.filename-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.filename-group label {
    font-weight: 600;
    white-space: nowrap;
}

.filename-input-wrapper {
    display: flex;
    align-items: center;
    flex: 1;
}

.filename-input-wrapper input {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.file-ext {
    background-color: var(--bg-sub);
    border: 1px solid var(--border-color);
    border-left: none;
    padding: 12px 14px;
    border-top-right-radius: var(--border-radius-sm);
    border-bottom-right-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

.btn-group-responsive {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

/* トースト通知 */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #1e293b;
    color: #ffffff;
    padding: 12px 24px;
    border-radius: 30px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 9999;
    transition: opacity 0.3s ease;
}

/* --------------------------------------------------------------------------
   10. ユーティリティ & 印刷設定
   -------------------------------------------------------------------------- */
.hidden {
    display: none !important;
}

@media print {
    header, footer, .form-section, .type-tabs, .customize-accordion, .action-buttons, .filename-group, .btn-group-responsive, .privacy-notice {
        display: none !important;
    }
    
    body {
        background-color: #ffffff !important;
        color: #000000 !important;
    }

    .card-container {
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
    }

    .preview-box {
        border: none !important;
        background: transparent !important;
    }
}

/* レスポンシブ調整 */
@media (max-width: 600px) {
    .card-container {
        padding: 20px 16px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .filename-group {
        flex-direction: column;
        align-items: flex-start;
    }

    .filename-input-wrapper {
        width: 100%;
    }
}

/* kotetsu.tech 共通デザイン */
.kotetsu-nav{width:100%;position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 10px #0000001a}.kotetsu-nav__inner{width:min(1000px,calc(100% - 40px));height:60px;margin:auto;display:flex;align-items:center;justify-content:space-between}.kotetsu-nav a{display:flex;align-items:center;gap:8px;color:#2c3e50;text-decoration:none;font-size:.92rem;font-weight:700}.kotetsu-nav a:hover{color:#2563eb}.kotetsu-nav__brand{color:#2563eb!important}.app-header{padding:34px 24px;border:0;background:linear-gradient(135deg,#e0f2fe 0%,#f0fdf4 100%)}.header-container{max-width:900px}.app-title{color:#0f172a}.main-content{padding:40px 16px 55px}.card-container{border-radius:16px;box-shadow:0 10px 25px -5px #0000000d}.app-footer{margin:0;padding:25px 16px;color:#cbd5e1;background:#2c3e50}[data-theme="dark"] .kotetsu-nav{background:#fff}[data-theme="dark"] .kotetsu-nav a{color:#2c3e50}[data-theme="dark"] .app-header{background:linear-gradient(135deg,#172554,#052e2b)}@media(max-width:600px){.kotetsu-nav__brand{font-size:.78rem}.app-header{padding:25px 16px}.app-title{font-size:1.1rem}}