:root {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --surface-hover: #2c2c2e;
    --primary-color: #38bdf8;
    --primary-hover: #0ea5e9;
    --primary-text: #0f172a;
    --on-surface-color: #e0e0e0;
    --on-background-color: #e0e0e0;
    --text-muted: #9e9ea7;
    --border-color: #333333;
    --danger-color: #ff6b6b;
    --success-color: #03dac6;
    --container-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
    --tab-active-bg: rgba(56, 189, 248, 0.15);
    --focus-ring: 0 0 0 2px rgba(56, 189, 248, 0.25);
    --qr-container-bg: #242426;
    --toast-bg: #323236;
    --toast-text: #ffffff;
    --toast-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

[data-theme="light"] {
    --background-color: #f1f5f9;
    --surface-color: #ffffff;
    --surface-hover: #f8fafc;
    --primary-color: #0284c7;
    --primary-hover: #0369a1;
    --primary-text: #ffffff;
    --on-surface-color: #1e293b;
    --on-background-color: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --container-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --tab-active-bg: rgba(2, 132, 199, 0.12);
    --focus-ring: 0 0 0 2px rgba(2, 132, 199, 0.25);
    --qr-container-bg: #f8fafc;
    --toast-bg: #1e293b;
    --toast-text: #ffffff;
    --toast-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--on-background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1.5rem 1rem;
    transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
    width: 100%;
    max-width: 480px;
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--container-shadow);
    border: 1px solid var(--border-color);
    transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.app-header {
    margin-bottom: 1.5rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.35rem;
}

.header-top h1 {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-shrink: 0;
}

.header-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--on-surface-color);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.lang-select-container {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.lang-globe-icon {
    position: absolute;
    left: 0.55rem;
    font-size: 0.95rem;
    pointer-events: none;
    line-height: 1;
    z-index: 1;
}

.lang-select {
    height: 36px;
    padding: 0 1.5rem 0 1.85rem;
    background-color: var(--background-color);
    color: var(--on-surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
    font-family: inherit;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%239e9ea7' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.45rem center;
}

[data-theme="light"] .lang-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

.lang-select:hover {
    background-color: var(--surface-hover);
    border-color: var(--primary-color);
}

.lang-select:focus {
    border-color: var(--primary-color);
    box-shadow: var(--focus-ring);
}

.lang-select option {
    background-color: var(--surface-color);
    color: var(--on-surface-color);
}

.theme-toggle-btn {
    width: 36px;
    font-size: 1.1rem;
}

.header-action-btn:hover {
    background-color: var(--surface-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: scale(1.05);
}

.header-action-btn:active {
    transform: scale(0.95);
}

/* テーマ切り替えアイコン表示制御 */
:root:not([data-theme="light"]) .theme-icon-dark,
[data-theme="dark"] .theme-icon-dark {
    display: none;
}

:root:not([data-theme="light"]) .theme-icon-light,
[data-theme="dark"] .theme-icon-light {
    display: inline-block;
}

[data-theme="light"] .theme-icon-light {
    display: none;
}

[data-theme="light"] .theme-icon-dark {
    display: inline-block;
}

.app-header .subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* タイプ選択タブ */
.type-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.65rem 0.5rem;
    background-color: var(--background-color);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.tab-btn:hover {
    background-color: var(--surface-hover);
    color: var(--on-surface-color);
}

.tab-btn.active {
    background-color: var(--tab-active-bg);
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color);
    font-weight: 600;
}

.tab-icon {
    font-size: 1.05rem;
    line-height: 1;
}

.tab-label {
    line-height: 1.2;
}

/* フォームとタブコンテンツ */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.25s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-row {
    display: flex;
    gap: 0.75rem;
}

.form-group.col {
    flex: 1;
}

.form-group label {
    display: block;
    margin-bottom: 0.45rem;
    font-size: 0.875rem;
    color: var(--on-surface-color);
}

.required {
    color: var(--danger-color);
    font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="url"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--on-surface-color);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-group select {
    cursor: pointer;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--focus-ring);
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 0.6rem;
    width: 1.15em;
    height: 1.15em;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* デザインカスタマイズ アコーディオン */
.design-accordion {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1.25rem;
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.design-accordion[open] {
    border-color: var(--primary-color);
}

.design-accordion-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    user-select: none;
    background-color: var(--surface-color);
    transition: background-color 0.2s ease;
}

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

.design-accordion-summary:hover {
    background-color: var(--surface-hover);
}

.summary-left {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.summary-icon {
    font-size: 1.05rem;
}

.summary-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.55rem;
    background-color: var(--tab-active-bg);
    color: var(--primary-color);
    border-radius: 12px;
    border: 1px solid var(--primary-color);
}

.design-panel {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.design-section-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--on-surface-color);
    margin-bottom: 0.4rem;
}

.design-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.design-section-header .design-section-label {
    margin-bottom: 0;
}

/* プリセットグリッド */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.4rem;
}

.preset-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.5rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

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

.preset-btn.active {
    border-color: var(--primary-color);
    background-color: var(--tab-active-bg);
    box-shadow: 0 0 0 1px var(--primary-color);
}

.preset-preview {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.preset-classic { background: #000000; }
.preset-ocean { background: linear-gradient(135deg, #0284c7, #38bdf8); }
.preset-sunset { background: linear-gradient(135deg, #ea580c, #f43f5e); }
.preset-emerald { background: linear-gradient(135deg, #059669, #10b981); }
.preset-cyber { background: linear-gradient(135deg, #7c3aed, #ec4899); }
.preset-rose { background: linear-gradient(135deg, #be123c, #fb7185); }

.preset-name {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--on-surface-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* デザイン行とセグメントコントロール */
.design-row {
    display: flex;
    gap: 0.75rem;
}

.design-col {
    flex: 1;
}

.segmented-control {
    display: flex;
    gap: 2px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 2px;
}

.segment-btn {
    flex: 1;
    padding: 0.4rem 0.25rem;
    font-size: 0.775rem;
    font-weight: 500;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.segment-btn:hover {
    color: var(--on-surface-color);
}

.segment-btn.active {
    background-color: var(--primary-color);
    color: var(--primary-text);
    font-weight: 600;
}

/* カラー設定 */
.color-type-toggle {
    display: flex;
    gap: 2px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 2px;
}

.color-type-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.725rem;
    font-weight: 500;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.color-type-btn.active {
    background-color: var(--primary-color);
    color: var(--primary-text);
    font-weight: 600;
}

.color-inputs-grid {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.color-input-group {
    flex: 1;
    min-width: 105px;
}

.color-input-group label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.color-picker {
    width: 32px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
    flex-shrink: 0;
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 5px;
}

.color-hex-input {
    width: 100%;
    padding: 0.4rem 0.45rem;
    font-size: 0.8rem;
    font-family: monospace;
    text-transform: uppercase;
    background-color: var(--surface-color);
    color: var(--on-surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

/* ロゴ・アイコン設定 */
.logo-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.custom-logo-upload-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.file-upload-btn {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    background-color: var(--surface-color);
    color: var(--on-surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.file-upload-btn:hover {
    background-color: var(--surface-hover);
    border-color: var(--primary-color);
}

.file-input-hidden {
    display: none;
}

.custom-logo-filename {
    font-size: 0.75rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 150px;
}

.custom-logo-clear-btn {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0 0.3rem;
}

.submit-btn {
    width: 100%;
    padding: 0.85rem;
    background-color: var(--primary-color);
    color: var(--primary-text);
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    margin-top: 0.5rem;
}

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

.submit-btn:active {
    transform: scale(0.99);
}

/* QRコード結果コンテナ */
#qrcode-container {
    margin-top: 1.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.25rem;
    background-color: var(--qr-container-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    animation: fadeIn 0.3s ease;
    transition: background-color 0.25s ease, border-color 0.25s ease;
}

#qrcode-container.hidden {
    display: none;
}

#qrcode {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.5rem;
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

#qrcode canvas,
#qrcode img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* アクションボタン */
.action-buttons {
    display: flex;
    gap: 0.75rem;
    width: 100%;
    margin-top: 1.25rem;
}

.action-btn {
    flex: 1;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.4rem;
    padding: 0.65rem 1rem;
    background-color: var(--surface-color);
    color: var(--on-surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

/* トースト通知 */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--toast-bg);
    color: var(--toast-text);
    padding: 0.75rem 1.5rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--toast-shadow);
    border: 1px solid var(--border-color);
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.25s ease;
}

.toast.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 10px);
}

/* レスポンシブ対応 */
@media (max-width: 480px) {
    body {
        padding: 1rem 0.75rem;
    }

    .container {
        padding: 1.5rem 1.15rem;
        border-radius: 10px;
    }

    .header-top h1 {
        font-size: 1.25rem;
    }

    .header-action-btn,
    .lang-select {
        height: 32px;
    }

    .lang-select {
        padding: 0 1.25rem 0 1.65rem;
        font-size: 0.75rem;
        background-position: right 0.35rem center;
    }

    .lang-globe-icon {
        left: 0.45rem;
        font-size: 0.85rem;
    }

    .theme-toggle-btn {
        width: 32px;
        font-size: 0.95rem;
    }

    .type-tabs {
        gap: 0.4rem;
        margin-bottom: 1.25rem;
    }

    .tab-btn {
        padding: 0.6rem 0.25rem;
        font-size: 0.8rem;
        gap: 0.25rem;
    }

    .tab-icon {
        font-size: 0.95rem;
    }

    .form-group {
        margin-bottom: 1rem;
    }

    .design-row {
        flex-direction: column;
        gap: 0.75rem;
    }

    .preset-grid {
        gap: 0.3rem;
    }

    .preset-btn {
        padding: 0.35rem 0.3rem;
        gap: 0.25rem;
    }

    .preset-name {
        font-size: 0.7rem;
    }

    .color-inputs-grid {
        gap: 0.4rem;
    }
}