:root {
    /* Light Mode Colors */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    --primary-color: #007AFF;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --danger-color: #FF3B30;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --input-bg: rgba(255, 255, 255, 0.9);
    --input-border: rgba(0, 122, 255, 0.2);
    --input-focus-border: #007AFF;
    --input-focus-shadow: rgba(0, 122, 255, 0.2);
    --hover-bg: rgba(242, 242, 247, 0.8);
    --body-gradient-start: #F5F5F7;
    --body-gradient-end: #E8E8ED;
    --button-gradient-start: #5E97F6;
    --button-gradient-end: #4A7FE3;
    --button-hover-start: #4A7FE3;
    --button-hover-end: #3A6FD0;
}

[data-theme="dark"] {
    --glass-bg: rgba(28, 28, 30, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.3);
    --primary-color: #0A84FF;
    --success-color: #30D158;
    --warning-color: #FF9F0A;
    --danger-color: #FF453A;
    --text-primary: #FFFFFF;
    --text-secondary: #A1A1A6;
    --input-bg: rgba(44, 44, 46, 0.9);
    --input-border: rgba(10, 132, 255, 0.2);
    --input-focus-border: #0A84FF;
    --input-focus-shadow: rgba(10, 132, 255, 0.2);
    --hover-bg: rgba(58, 58, 60, 0.8);
    --body-gradient-start: #1C1C1E;
    --body-gradient-end: #2C2C2E;
    --button-gradient-start: #4A7FE3;
    --button-gradient-end: #3A6FD0;
    --button-hover-start: #3A6FD0;
    --button-hover-end: #2A5FC0;
}

/* 主題切換按鈕 */
.theme-switch-wrapper {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.theme-switch {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 12px var(--glass-shadow);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-switch:hover {
    transform: scale(1.1);
    background: var(--hover-bg);
}

.theme-switch-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

[data-theme="dark"] .theme-switch-icon {
    transform: rotate(180deg);
}

/* 基礎設定 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient(135deg, var(--body-gradient-start) 0%, var(--body-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.5;
    transition: background 0.3s ease;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 600;
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    letter-spacing: -0.5px;
}

.section {
    margin-bottom: 30px;
    padding: clamp(15px, 3vw, 25px);
    border-radius: 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px var(--glass-shadow);
    transition: all 0.3s ease;
}

.section-title {
    font-size: clamp(1.2rem, 3vw, 1.4rem);
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--text-primary);
    padding-bottom: 15px;
    border-bottom: 2px solid var(--input-border);
    letter-spacing: 0.5px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: clamp(0.9rem, 2vw, 0.95rem);
    letter-spacing: 0.3px;
}

.form-group input[type="text"],
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--input-border);
    border-radius: 12px;
    font-size: clamp(0.9rem, 2vw, 1rem);
    background: var(--input-bg);
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.form-group input[type="text"]:hover,
.form-group textarea:hover {
    border-color: var(--input-focus-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.form-group input[type="text"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
    background: var(--input-bg);
}

.form-group textarea {
    min-height: 120px;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    line-height: 1.5;
    resize: vertical;
}

.form-group input[type="text"]::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.btn-calculate {
    background: linear-gradient(135deg, var(--success-color), #2FB350);
    color: #FFFFFF;
    padding: clamp(12px, 2vw, 14px) clamp(20px, 4vw, 28px);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: clamp(1rem, 2vw, 1.1rem);
    font-weight: 500;
    display: block;
    margin: 30px auto;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(48, 209, 88, 0.2);
    width: clamp(200px, 80%, 300px);
    position: relative;
    overflow: hidden;
}

.btn-calculate::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(48, 209, 88, 0.3);
    background: linear-gradient(135deg, #2FB350, #2A9D45);
}

.btn-calculate:hover::before {
    opacity: 1;
}

.btn-calculate:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(48, 209, 88, 0.2);
}

/* 金鑰產生按鈕容器 */
.key-generator-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

/* 金鑰產生按鈕樣式 */
.btn-generate {
    background: linear-gradient(135deg, var(--button-gradient-start), var(--button-gradient-end));
    color: #FFFFFF;
    padding: 15px 20px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    position: relative;
    overflow: hidden;
    opacity: 0.9;
}

.btn-generate::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, var(--button-hover-start), var(--button-hover-end));
    opacity: 1;
}

.btn-generate:hover::before {
    opacity: 1;
}

.btn-generate:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.15));
    opacity: 0.9;
}

.btn-generate:hover .btn-icon {
    transform: scale(1.1);
    opacity: 1;
}

.btn-text {
    white-space: nowrap;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    opacity: 0.9;
}

.btn-generate:hover .btn-text {
    opacity: 1;
}

/* 響應式設計調整 */
@media screen and (max-width: 768px) {
    .key-generator-buttons {
        grid-template-columns: 1fr;
    }
    
    .btn-generate {
        padding: 12px 15px;
        font-size: 0.9rem;
    }
}

.warning-text {
    color: var(--danger-color);
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    margin-top: 8px;
    font-style: italic;
    opacity: 0.9;
    padding-left: 5px;
    border-left: 3px solid var(--danger-color);
}

.result-section {
    display: flex;
    flex-direction: column;
    gap: 25px;
    margin-top: 25px;
}

/* JSON 顯示區域樣式 */
.json-display-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

.json-display-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 12px;
}

.json-display-title {
    font-weight: 600;
    color: var(--text-primary);
}

.json-display-description {
    font-size: 0.9em;
    color: var(--text-secondary);
}

.json-display {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 12px;
    font-family: monospace;
    white-space: pre-wrap;
    word-break: break-all;
    min-height: 60px;
    max-height: 200px;
    overflow-y: auto;
}

/* QR Code 容器樣式 */
.qrcode-container {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
    margin: 0 20px;  /* 兩邊留空白 */
}

.qrcode-display {
    width: 100%;
    padding: clamp(20px, 4vw, 30px);  /* 增加內邊距 */
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 10px;  /* 兩邊留空白 */
}

.qrcode-display img {
    max-width: min(200px, 80%);
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--glass-shadow);
}

/* 自定義滾動條 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--input-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 響應式設計 */
@media screen and (min-width: 768px) {
    .result-section {
        flex-direction: row;
    }

    .json-display,
    .qrcode-display {
        flex: 1;
    }

    .btn-generate {
        width: auto;
    }
}

/* 手機版優化 */
@media screen and (max-width: 480px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 10px;
    }

    .section {
        padding: 15px;
    }

    .btn-calculate,
    .btn-generate {
        width: 100%;
    }

    .theme-switch-wrapper {
        top: 10px;
        right: 10px;
    }

    .theme-switch {
        width: 40px;
        height: 40px;
    }
}

/* 平板版優化 */
@media screen and (min-width: 481px) and (max-width: 767px) {
    .container {
        padding: 15px;
    }
}

.message {
    text-align: center;
    color: #666;
    margin-top: 20px;
}

/* 通知訊息樣式 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transform: translateX(120%);
    transition: transform 0.3s ease;
    z-index: 1000;
    max-width: 400px;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid #4CAF50;
}

.notification.error {
    border-left: 4px solid #f44336;
}

.notification-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.notification-icon {
    font-size: 20px;
    line-height: 1;
}

.notification-message {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.notification-text {
    color: var(--text-primary);
    opacity: 0.9;
    font-size: 0.95em;
}

/* 深色模式下的通知樣式 */
@media (prefers-color-scheme: dark) {
    .notification {
        background: rgba(0, 0, 0, 0.2);
        border-color: rgba(255, 255, 255, 0.1);
    }
}

/* 按鈕載入中狀態 */
.btn-generate:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* ============================================
   動態欄位相關樣式
   ============================================ */

/* 動態欄位群組容器 */
#dynamic-fields-container {
    margin-bottom: 20px;
}

/* 單一動態欄位群組 */
.dynamic-field-group {
    margin-bottom: 15px;
    padding: 15px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.dynamic-field-group:hover {
    border-color: var(--input-focus-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 動態欄位行（使用 flexbox 排版）*/
.dynamic-field-row {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

/* 動態欄位 - Key 區塊 */
.dynamic-field-key {
    flex: 1;
    min-width: 0;
}

/* 動態欄位 - Value 區塊 */
.dynamic-field-value {
    flex: 2;
    min-width: 0;
}

/* 動態欄位 - 操作按鈕區塊 */
.dynamic-field-actions {
    flex-shrink: 0;
}

/* 動態欄位內的 label */
.dynamic-field-key label,
.dynamic-field-value label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
}

/* 動態欄位內的 input */
.dynamic-field-key input,
.dynamic-field-value input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--glass-bg);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.dynamic-field-key input:focus,
.dynamic-field-value input:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}

/* 新增欄位按鈕 */
.btn-add-field {
    background: linear-gradient(135deg, var(--primary-color), #0066CC);
    color: #FFFFFF;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.2);
}

.btn-add-field:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.3);
    background: linear-gradient(135deg, #0066CC, #0052A3);
}

.btn-add-field:active {
    transform: translateY(0);
}

/* 刪除欄位按鈕 */
.btn-remove-field {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--danger-color), #E02020);
    color: #FFFFFF;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(255, 59, 48, 0.2);
}

.btn-remove-field:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(255, 59, 48, 0.4);
    background: linear-gradient(135deg, #E02020, #C01010);
}

.btn-remove-field:active {
    transform: scale(0.95);
}

.btn-remove-field .btn-icon {
    font-size: 1.2rem;
}

/* 響應式設計：手機版 */
@media screen and (max-width: 768px) {
    .dynamic-field-row {
        flex-direction: column;
        gap: 10px;
    }

    .dynamic-field-key,
    .dynamic-field-value {
        width: 100%;
    }

    .dynamic-field-actions {
        display: flex;
        justify-content: flex-end;
    }

    .btn-add-field {
        width: 100%;
        justify-content: center;
    }
}