/* === 現代 iOS 風格設計系統 === */
:root {
    /* 主色調 - 深空灰藍系列 */
    --primary-blue: #007AFF;
    --primary-blue-light: #40A4FF;
    --primary-blue-dark: #0056D6;
    --primary-gradient: linear-gradient(135deg, #007AFF 0%, #5AC8FA 100%);
    
    /* 中性色系 */
    --background-primary: #FFFFFF;
    --background-secondary: #F7F7F7;
    --background-tertiary: #EFEFEF;
    --background-elevated: #FFFFFF;
    
    /* 深色模式準備 */
    --background-dark: #1C1C1E;
    --background-dark-secondary: #2C2C2E;
    --background-dark-tertiary: #3A3A3C;
    
    /* 文字色調 */
    --text-primary: #000000;
    --text-secondary: #3C3C43;
    --text-tertiary: #8E8E93;
    --text-placeholder: #C7C7CC;
    
    /* 語義色彩 */
    --success: #30D158;
    --warning: #FF9F0A;
    --error: #FF3B30;
    --info: #007AFF;
    
    /* 陰影系統 */
    --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-medium: 0 3px 6px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.12);
    --shadow-large: 0 10px 20px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.04), 0 0 1px rgba(0, 0, 0, 0.08);
    
    /* 圓角設計 */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;
    --radius-xl: 20px;
    --radius-card: 14px;
    
    /* 動畫 */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 間距系統 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
}

/* === 基礎重置 === */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* === 頂部容器 === */
.header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-medium);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
}

/* === 標題設計 === */
h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--space-lg);
    opacity: 0.8;
}

/* === 現代導覽列 === */
.main-nav {
    display: flex;
    justify-content: center;
    padding: var(--space-md) 0;
    background: var(--background-elevated);
    border-radius: var(--radius-large);
    margin: var(--space-md);
    box-shadow: var(--shadow-card);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-xs);
    background: var(--background-secondary);
    padding: var(--space-xs);
    border-radius: var(--radius-medium);
}

.main-nav .nav-item {
    position: relative;
}

.main-nav .nav-item > a {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-small);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
    white-space: nowrap;
}

.main-nav .nav-item > a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-small);
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: -1;
}

.main-nav .nav-item > a:hover {
    color: var(--primary-blue);
    transform: translateY(-1px);
}

.main-nav .nav-item > a:hover::before {
    opacity: 0.1;
}

.main-nav .nav-item.active-parent > a {
    color: white;
    box-shadow: var(--shadow-medium);
}

.main-nav .nav-item.active-parent > a::before {
    opacity: 1;
}

/* === 下拉選單重新設計 === */
.main-nav .nav-item.has-dropdown {
    position: relative;
}

.main-nav .dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--background-elevated);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-large);
    padding: var(--space-md);
    min-width: 220px;
    z-index: 1001;
    border: 1px solid rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* 關鍵修復：在父級和子選單之間創建無縫連接區域 */
.main-nav .nav-item.has-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 8px;
    background: transparent;
    z-index: 1000;
    display: none;
}

.main-nav .nav-item.has-dropdown:hover::after {
    display: block;
}

.main-nav .nav-item.has-dropdown:hover .dropdown-menu {
    display: block;
    animation: dropdownSlide 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 修正下拉選單間距問題 */
.main-nav .nav-item.has-dropdown {
    margin-bottom: 0;
}

.dropdown-menu {
    list-style: none;
    margin: 0;
    padding: var(--space-sm);
}

.dropdown-menu li {
    width: 100%;
    margin: var(--space-xs) 0;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-small);
    transition: all var(--transition-fast);
    font-weight: 500;
    white-space: nowrap;
    font-size: 0.9rem;
}

.dropdown-menu a:hover,
.dropdown-menu a.active {
    background: var(--primary-blue);
    color: white;
    transform: translateX(4px);
}

@keyframes dropdownSlide {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

/* === 圖片預覽容器 === */
.image-preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--background-secondary);
    border-radius: var(--radius-medium);
    border: 2px dashed #ddd;
}

.preview-item {
    text-align: center;
    max-width: 150px;
}

.preview-item img {
    max-width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: var(--radius-small);
    box-shadow: var(--shadow-small);
}

.preview-item span {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* === 輸入說明和提示 === */
.input-notes {
    margin-top: var(--space-sm);
    padding: var(--space-md);
    background: rgba(0, 122, 255, 0.05);
    border-left: 4px solid var(--primary-blue);
    border-radius: 0 var(--radius-small) var(--radius-small) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.input-notes ul {
    margin: 0;
    padding-left: 1.2em;
}

.input-notes li {
    margin-bottom: var(--space-xs);
}

/* === 滑桿容器 === */
.slider-container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: var(--space-sm) 0;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-blue);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 122, 255, 0.3);
}

.slider-container input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-blue);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 122, 255, 0.3);
}

.slider-container span {
    min-width: 60px;
    text-align: center;
    font-weight: 600;
    color: var(--primary-blue);
    background: rgba(0, 122, 255, 0.1);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-small);
}

/* === 結果容器格式 === */
.result-container-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

/* === 響應式設計改進 === */
@media (max-width: 768px) {
    .main-nav {
        margin: var(--space-sm);
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .main-nav .dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        background: rgba(0, 122, 255, 0.05);
        margin-top: var(--space-sm);
    }
    
    .main-nav .nav-item.has-dropdown:hover .dropdown-menu {
        display: block;
    }
    
    .image-preview-container {
        justify-content: center;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }
}

/* === OmniHuman 風格的輸入框樣式 === */
.omnihuman-style-input {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-medium);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.omnihuman-style-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.omnihuman-style-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.omnihuman-style-textarea {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-medium);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.omnihuman-style-textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.omnihuman-style-textarea::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

/* 為深色背景的頁面調整樣式 */
.form-section {
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    border-radius: var(--radius-large);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
}

/* 讓特定的表單使用新樣式 */
#seedream-v4-content input[type="text"],
#seedream-v4-content input[type="password"],
#seedream-v4-content input[type="url"], 
#seedream-v4-content input[type="number"],
#seedream-v4-content textarea,
#seededit-content input[type="text"], 
#seededit-content input[type="password"],
#seededit-content input[type="url"],
#seededit-content input[type="number"],
#seededit-content textarea,
#seedream-content input[type="text"],
#seedream-content input[type="password"], 
#seedream-content input[type="url"],
#seedream-content input[type="number"],
#seedream-content textarea,
#t2v-content input[type="text"],
#t2v-content input[type="password"], 
#t2v-content input[type="url"],
#t2v-content input[type="number"],
#t2v-content textarea,
#i2v-content input[type="text"],
#i2v-content input[type="password"], 
#i2v-content input[type="url"],
#i2v-content input[type="number"],
#i2v-content textarea,
#i2v-frames-content input[type="text"],
#i2v-frames-content input[type="password"], 
#i2v-frames-content input[type="url"],
#i2v-frames-content input[type="number"],
#i2v-frames-content textarea,
#omnihuman-content input[type="text"],
#omnihuman-content input[type="password"], 
#omnihuman-content input[type="url"],
#omnihuman-content input[type="number"],
#omnihuman-content textarea,
#tts-content input[type="text"],
#tts-content input[type="password"], 
#tts-content input[type="url"],
#tts-content input[type="number"],
#tts-content textarea,
#voice-clone-content input[type="text"],
#voice-clone-content input[type="password"], 
#voice-clone-content input[type="url"],
#voice-clone-content input[type="number"],
#voice-clone-content textarea {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-medium);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#seedream-v4-content input[type="text"]:focus,
#seedream-v4-content input[type="password"]:focus,
#seedream-v4-content input[type="url"]:focus,
#seedream-v4-content input[type="number"]:focus,
#seedream-v4-content textarea:focus,
#seededit-content input[type="text"]:focus,
#seededit-content input[type="password"]:focus,
#seededit-content input[type="url"]:focus,
#seededit-content input[type="number"]:focus,
#seededit-content textarea:focus,
#seedream-content input[type="text"]:focus,
#seedream-content input[type="password"]:focus,
#seedream-content input[type="url"]:focus,
#seedream-content input[type="number"]:focus,
#seedream-content textarea:focus,
#t2v-content input[type="text"]:focus,
#t2v-content input[type="password"]:focus,
#t2v-content input[type="url"]:focus,
#t2v-content input[type="number"]:focus,
#t2v-content textarea:focus,
#i2v-content input[type="text"]:focus,
#i2v-content input[type="password"]:focus,
#i2v-content input[type="url"]:focus,
#i2v-content input[type="number"]:focus,
#i2v-content textarea:focus,
#i2v-frames-content input[type="text"]:focus,
#i2v-frames-content input[type="password"]:focus,
#i2v-frames-content input[type="url"]:focus,
#i2v-frames-content input[type="number"]:focus,
#i2v-frames-content textarea:focus,
#omnihuman-content input[type="text"]:focus,
#omnihuman-content input[type="password"]:focus,
#omnihuman-content input[type="url"]:focus,
#omnihuman-content input[type="number"]:focus,
#omnihuman-content textarea:focus,
#tts-content input[type="text"]:focus,
#tts-content input[type="password"]:focus,
#tts-content input[type="url"]:focus,
#tts-content input[type="number"]:focus,
#tts-content textarea:focus,
#voice-clone-content input[type="text"]:focus,
#voice-clone-content input[type="password"]:focus,
#voice-clone-content input[type="url"]:focus,
#voice-clone-content input[type="number"]:focus,
#voice-clone-content textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

#seedream-v4-content input[type="text"]::placeholder,
#seedream-v4-content input[type="password"]::placeholder,
#seedream-v4-content input[type="url"]::placeholder,
#seedream-v4-content input[type="number"]::placeholder,
#seedream-v4-content textarea::placeholder,
#seededit-content input[type="text"]::placeholder,
#seededit-content input[type="password"]::placeholder,
#seededit-content input[type="url"]::placeholder,
#seededit-content input[type="number"]::placeholder,
#seededit-content textarea::placeholder,
#seedream-content input[type="text"]::placeholder,
#seedream-content input[type="password"]::placeholder,
#seedream-content input[type="url"]::placeholder,
#seedream-content input[type="number"]::placeholder,
#seedream-content textarea::placeholder,
#t2v-content input[type="text"]::placeholder,
#t2v-content input[type="password"]::placeholder,
#t2v-content input[type="url"]::placeholder,
#t2v-content input[type="number"]::placeholder,
#t2v-content textarea::placeholder,
#i2v-content input[type="text"]::placeholder,
#i2v-content input[type="password"]::placeholder,
#i2v-content input[type="url"]::placeholder,
#i2v-content input[type="number"]::placeholder,
#i2v-content textarea::placeholder,
#i2v-frames-content input[type="text"]::placeholder,
#i2v-frames-content input[type="password"]::placeholder,
#i2v-frames-content input[type="url"]::placeholder,
#i2v-frames-content input[type="number"]::placeholder,
#i2v-frames-content textarea::placeholder,
#omnihuman-content input[type="text"]::placeholder,
#omnihuman-content input[type="password"]::placeholder,
#omnihuman-content input[type="url"]::placeholder,
#omnihuman-content input[type="number"]::placeholder,
#omnihuman-content textarea::placeholder,
#tts-content input[type="text"]::placeholder,
#tts-content input[type="password"]::placeholder,
#tts-content input[type="url"]::placeholder,
#tts-content input[type="number"]::placeholder,
#tts-content textarea::placeholder,
#voice-clone-content input[type="text"]::placeholder,
#voice-clone-content input[type="password"]::placeholder,
#voice-clone-content input[type="url"]::placeholder,
#voice-clone-content input[type="number"]::placeholder,
#voice-clone-content textarea::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

/* 特殊處理 select 元素 */
#seedream-v4-content select,
#seededit-content select,
#seedream-content select,
#t2v-content select,
#i2v-content select,
#i2v-frames-content select,
#omnihuman-content select,
#tts-content select,
#voice-clone-content select {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-medium);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#seedream-v4-content select:focus,
#seededit-content select:focus,
#seedream-content select:focus,
#t2v-content select:focus,
#i2v-content select:focus,
#i2v-frames-content select:focus,
#omnihuman-content select:focus,
#tts-content select:focus,
#voice-clone-content select:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* 改進輸入框網格布局 */
.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

/* 讓 textarea 更大更實用 */
textarea {
    min-height: 120px;
    font-family: inherit;
    resize: both;
    line-height: 1.5;
    width: 100% !important;
}

/* 特別針對 Prompt 和文字輸入的大型框 */
#prompt_seedream_v4,
#text_tts,
#prompt_seededit,
#prompt_seedream,
#prompt_t2v,
#prompt_i2v,
#prompt_i2v_frames {
    min-height: 150px !important;
    height: 150px;
    width: 100% !important;
    resize: both !important;
    font-size: 1rem;
    line-height: 1.6;
    padding: var(--space-lg) !important;
}

/* 統一按鈕樣式 - 正常大小 */
button[type="button"] {
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-medium);
    margin-top: var(--space-md);
    display: block;
    width: auto;
    clear: both;
}

/* 確保按鈕不會被網格系統影響 */
.form-section > button[type="button"] {
    grid-column: 1 / -1;
    margin-top: var(--space-lg);
    width: auto;
    display: block;
    clear: both;
}

/* 確保 Seed 輸入框和按鈕分行 */
input[id*="seed"] + button[type="button"],
input[placeholder*="-1"] + button[type="button"] {
    margin-top: var(--space-lg);
    display: block;
    width: auto;
    clear: both;
}

/* 確保所有表單的 textarea 都有足夠大小 */
.form-section textarea {
    min-height: 120px !important;
    width: 100% !important;
    box-sizing: border-box;
    resize: both;
}

/* 強制確保所有按鈕獨立成行 */
.form-section button[type="button"],
#submitBtn_seedream,
#submitBtn_seededit,
#submitBtn_seedream_v4 {
    display: block !important;
    width: auto !important;
    margin-top: var(--space-lg) !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    clear: both !important;
    float: none !important;
    grid-column: 1 / -1 !important;
}

/* 確保 Seed 輸入框後的元素都換行 */
input[id*="seed"] {
    display: block !important;
    width: 100% !important;
    margin-bottom: var(--space-md) !important;
}

/* 覆蓋任何可能導致並排的樣式 */
.input-grid + button,
input[type="number"] + button {
    display: block !important;
    width: auto !important;
    margin-top: var(--space-lg) !important;
    clear: both !important;
}
    border: 1px solid rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
}

.nav-item:hover .dropdown-menu {
    display: flex;
    animation: dropdownSlide 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.dropdown-menu li {
    width: 100%;
}

.dropdown-menu a {
    display: block;
    padding: var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-small);
    transition: all var(--transition-fast);
    font-weight: 500;
    white-space: nowrap;
}

.dropdown-menu a:hover,
.dropdown-menu a.active {
    background: var(--primary-blue);
    color: white;
    transform: translateX(4px);
}

/* === 主容器 === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg);
}

/* === 分頁容器 === */
.tab-content {
    display: none;
    animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.tab-content.active {
    display: block;
}

/* === 表單區塊重新設計 === */
.form-section {
    background: var(--background-elevated);
    border-radius: var(--radius-card);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-card);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.form-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.form-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.form-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--space-lg) 0 var(--space-md) 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.form-section > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 1rem;
    line-height: 1.7;
}

/* === 輸入網格系統 === */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

/* === 標籤樣式 === */
label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    font-size: 0.95rem;
    letter-spacing: -0.01em;
}

/* === 現代輸入框 === */
.input-grid input,
.input-grid select,
.input-grid textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--background-elevated);
    transition: all var(--transition-fast);
    appearance: none;
    outline: none;
}

.input-grid input:focus,
.input-grid select:focus,
.input-grid textarea:focus {
    border-color: var(--primary-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
    transform: translateY(-1px);
}

.input-grid input::placeholder {
    color: var(--text-placeholder);
    font-weight: 400;
}

/* === 認證區域特殊設計 === */
.auth-notice {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.05) 0%, rgba(90, 200, 250, 0.05) 100%);
    border: 1px solid rgba(0, 122, 255, 0.2);
    border-radius: var(--radius-medium);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
    position: relative;
}

.auth-notice::before {
    content: '🔐';
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    font-size: 1.2rem;
}

.auth-notice p {
    margin: 0 0 0 var(--space-xl);
    color: var(--primary-blue-dark);
    font-size: 0.9rem;
    font-weight: 500;
}

/* === 密碼輸入容器 === */
.password-container {
    position: relative;
    display: flex;
    align-items: center;
}

.password-container input {
    padding-right: 50px;
}

.toggle-password {
    position: absolute;
    right: var(--space-md);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    padding: var(--space-sm);
    border-radius: var(--radius-small);
    transition: all var(--transition-fast);
    color: var(--text-tertiary);
    z-index: 10;
}

.toggle-password:hover {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-blue);
    transform: scale(1.1);
}

.toggle-password:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 1px;
}

/* === 輔助文字 === */
.help-text {
    display: block;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    margin-top: var(--space-sm);
    font-weight: 400;
    line-height: 1.4;
}

/* === 操作按鈕組 === */
.credential-actions {
    display: flex;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
    flex-wrap: wrap;
}

.test-btn, .clear-btn, .help-btn {
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--radius-medium);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.test-btn {
    background: linear-gradient(135deg, var(--success) 0%, #32D74B 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(48, 209, 88, 0.3);
}

.test-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(48, 209, 88, 0.4);
}

.test-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.clear-btn {
    background: var(--background-tertiary);
    color: var(--text-secondary);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.clear-btn:hover {
    background: var(--error);
    color: white;
    transform: translateY(-1px);
}

.help-btn {
    background: linear-gradient(135deg, var(--warning) 0%, #FFCC02 100%);
    color: rgba(0, 0, 0, 0.8);
    font-weight: 700;
}

.help-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 159, 10, 0.3);
}

/* === 複選框重新設計 === */
.checkbox-container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm);
    background: transparent;
    border-radius: var(--radius-small);
    margin: var(--space-sm) 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: fit-content;
    max-width: 100%;
}

.checkbox-container:hover {
    background: rgba(0, 122, 255, 0.05);
}

/* 重要：使用 !important 確保 checkbox 不受其他樣式影響 */
.checkbox-container input[type="checkbox"],
#seedream-v4-content .checkbox-container input[type="checkbox"],
#seededit-content .checkbox-container input[type="checkbox"],
#seedream-content .checkbox-container input[type="checkbox"] {
    width: 18px !important;
    height: 18px !important;
    min-width: 18px !important;
    appearance: none !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    border: 2px solid rgba(255, 255, 255, 0.3) !important;
    border-radius: 4px !important;
    cursor: pointer !important;
    position: relative !important;
    transition: all var(--transition-fast) !important;
    flex-shrink: 0 !important;
    background: rgba(255, 255, 255, 0.1) !important;
    padding: 0 !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

.checkbox-container input[type="checkbox"]:checked,
#seedream-v4-content .checkbox-container input[type="checkbox"]:checked,
#seededit-content .checkbox-container input[type="checkbox"]:checked,
#seedream-content .checkbox-container input[type="checkbox"]:checked {
    background: var(--primary-blue) !important;
    border-color: var(--primary-blue) !important;
}

.checkbox-container input[type="checkbox"]:checked::after,
#seedream-v4-content .checkbox-container input[type="checkbox"]:checked::after,
#seededit-content .checkbox-container input[type="checkbox"]:checked::after,
#seedream-content .checkbox-container input[type="checkbox"]:checked::after {
    content: '✓' !important;
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    color: white !important;
    font-size: 12px !important;
    font-weight: bold !important;
}

.checkbox-container input[type="checkbox"]:focus,
#seedream-v4-content .checkbox-container input[type="checkbox"]:focus,
#seededit-content .checkbox-container input[type="checkbox"]:focus,
#seedream-content .checkbox-container input[type="checkbox"]:focus {
    outline: none !important;
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.3) !important;
}

.checkbox-container label {
    margin: 0;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    flex-shrink: 1;
    line-height: 1.4;
}

/* === 本地儲存選項 === */
.storage-option {
    margin: var(--space-lg) 0;
    padding: var(--space-lg);
    background: rgba(255, 159, 10, 0.05);
    border: 1px solid rgba(255, 159, 10, 0.2);
    border-radius: var(--radius-medium);
}

/* === 註記樣式 === */
.note {
    background: rgba(142, 142, 147, 0.08);
    border-radius: var(--radius-small);
    padding: var(--space-md);
    margin: var(--space-sm) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    border-left: 3px solid var(--primary-blue);
}

/* === 主要按鈕 === */
button[type="button"] {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: var(--space-lg) var(--space-2xl);
    border-radius: var(--radius-medium);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-medium);
    box-shadow: var(--shadow-medium);
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

button[type="button"]:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-large);
}

button[type="button"]:active {
    transform: translateY(-1px);
}

button[type="button"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

button[type="button"]:hover::before {
    left: 100%;
}

button[type="button"]:disabled {
    background: #cccccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* === 載入狀態 === */
.spinner {
    display: none;
    width: 32px;
    height: 32px;
    border: 3px solid rgba(0, 122, 255, 0.3);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: var(--space-lg) auto;
}

.spinner.active {
    display: block;
}

/* === 狀態訊息 === */
.status-message {
    padding: var(--space-md);
    border-radius: var(--radius-medium);
    margin: var(--space-md) 0;
    font-weight: 500;
    text-align: center;
    transform: translateY(10px);
    opacity: 0;
    transition: all var(--transition-medium);
}

.status-message.show {
    transform: translateY(0);
    opacity: 1;
}

.status-message.success {
    background: linear-gradient(135deg, rgba(48, 209, 88, 0.1) 0%, rgba(50, 215, 75, 0.1) 100%);
    color: var(--success);
    border: 1px solid rgba(48, 209, 88, 0.3);
}

.status-message.error {
    background: linear-gradient(135deg, rgba(255, 59, 48, 0.1) 0%, rgba(255, 69, 58, 0.1) 100%);
    color: var(--error);
    border: 1px solid rgba(255, 59, 48, 0.3);
}

.status-message.info {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.1) 0%, rgba(64, 164, 255, 0.1) 100%);
    color: var(--info);
    border: 1px solid rgba(0, 122, 255, 0.3);
}

/* === 結果容器 === */
.result-container {
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    background: var(--background-elevated);
    border-radius: var(--radius-card);
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: var(--shadow-card);
    transform: translateY(20px);
    opacity: 0;
    transition: all var(--transition-slow);
}

.result-container.show {
    transform: translateY(0);
    opacity: 1;
}

.result-container img,
.result-container video {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-medium);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

/* === 認證狀態指示 === */
.input-grid input.valid {
    border-color: var(--success) !important;
    box-shadow: 0 0 0 0.1rem rgba(40, 167, 69, 0.25);
}

.input-grid input.warning {
    border-color: var(--warning) !important;
    box-shadow: 0 0 0 0.1rem rgba(255, 193, 7, 0.25);
}

.input-grid input.invalid {
    border-color: var(--error) !important;
    box-shadow: 0 0 0 0.1rem rgba(220, 53, 69, 0.25);
}

/* === 動畫定義 === */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

@keyframes dropdownSlide {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* === 響應式設計 === */
@media (max-width: 768px) {
    .header-content {
        padding: var(--space-md);
    }
    
    .main-nav {
        margin: var(--space-sm);
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav .nav-item {
        width: 100%;
    }
    
    .main-nav .nav-item > a {
        justify-content: center;
        padding: var(--space-lg);
    }
    
    .input-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .form-section {
        margin: var(--space-md);
        padding: var(--space-lg);
    }
    
    .credential-actions {
        flex-direction: column;
    }
    
    .test-btn, .clear-btn, .help-btn {
        width: 100%;
        justify-content: center;
    }
}

/* === 深色模式支援 === */
@media (prefers-color-scheme: dark) {
    :root {
        --background-primary: var(--background-dark);
        --background-secondary: var(--background-dark-secondary);
        --background-tertiary: var(--background-dark-tertiary);
        --background-elevated: var(--background-dark);
        --text-primary: #FFFFFF;
        --text-secondary: #E5E5E7;
        --text-tertiary: #A1A1A6;
    }
    
    .header {
        background: rgba(28, 28, 30, 0.85);
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }
    
    .form-section {
        background: var(--background-dark-secondary);
        border-color: rgba(255, 255, 255, 0.1);
    }
    
    .input-grid input,
    .input-grid select,
    .input-grid textarea {
        background: var(--background-dark-tertiary);
        border-color: rgba(255, 255, 255, 0.1);
        color: var(--text-primary);
    }
}

/* === 可及性增強 === */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* === 打印樣式 === */
@media print {
    .main-nav,
    .credential-actions,
    button {
        display: none;
    }
    
    .form-section {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}