/* 精美统一导航栏设计 - 顶部导航和返回按钮 */

/* 导航栏变量 */
:root {
    --nav-height: 68px;
    --nav-bg: linear-gradient(135deg, rgba(102, 126, 234, 0.95) 0%, rgba(118, 75, 162, 0.95) 100%);
    --nav-border: rgba(255, 255, 255, 0.25);
    --nav-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.08);
    --nav-backdrop: blur(25px) saturate(200%);
    
    --btn-size: 48px;
    --btn-bg: rgba(255, 255, 255, 0.15);
    --btn-border: rgba(255, 255, 255, 0.3);
    --btn-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    --btn-hover-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    
    --title-color: #ffffff;
    --title-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 精美页面头部 */
.page-header {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    padding: 16px 24px !important;
    background: var(--nav-bg) !important;
    backdrop-filter: var(--nav-backdrop) !important;
    border: 1px solid var(--nav-border) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15) !important;
    position: sticky !important;
    top: 0 !important;
    z-index: 100 !important;
    box-shadow: var(--nav-shadow) !important;
    transition: var(--transition-smooth) !important;
    min-height: var(--nav-height) !important;
    position: relative !important;
    overflow: hidden !important;
}

/* 头部装饰效果 */
.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><radialGradient id="a" cx="50%" cy="50%" r="50%"><stop offset="0%" stop-color="rgba(255,255,255,0.1)"/><stop offset="100%" stop-color="rgba(255,255,255,0)"/></radialGradient></defs><circle cx="20" cy="20" r="1.5" fill="url(%23a)"><animate attributeName="cy" values="20;80;20" dur="12s" repeatCount="indefinite"/></circle><circle cx="80" cy="80" r="1" fill="url(%23a)"><animate attributeName="cx" values="80;20;80" dur="15s" repeatCount="indefinite"/></circle><circle cx="50" cy="50" r="0.8" fill="url(%23a)"><animate attributeName="r" values="0.8;2;0.8" dur="10s" repeatCount="indefinite"/></circle></svg>');
    opacity: 0.4;
    pointer-events: none;
    z-index: 1;
}

.page-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: headerShine 8s ease-in-out infinite;
    pointer-events: none;
    z-index: 2;
}

@keyframes headerShine {
    0% { left: -100%; }
    50% { left: 100%; }
    100% { left: 100%; }
}

/* 超精美返回按钮 */
.back-btn {
    width: var(--btn-size) !important;
    height: var(--btn-size) !important;
    border: none !important;
    background: var(--btn-bg) !important;
    backdrop-filter: blur(20px) saturate(180%) !important;
    color: white !important;
    border-radius: 20px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 1.3rem !important;
    cursor: pointer !important;
    transition: var(--transition-smooth) !important;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.16),
        0 4px 16px rgba(102, 126, 234, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.1) !important;
    border: 3px solid transparent !important;
    background-clip: padding-box !important;
    position: relative !important;
    overflow: hidden !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    pointer-events: auto !important;
    z-index: 103 !important;
}

.back-btn::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, 
        rgba(255, 255, 255, 0.4) 0%,
        rgba(102, 126, 234, 0.3) 25%,
        rgba(118, 75, 162, 0.3) 50%,
        rgba(240, 147, 251, 0.3) 75%,
        rgba(255, 255, 255, 0.4) 100%);
    border-radius: 22px;
    opacity: 0;
    transition: all 0.4s ease;
    z-index: -1;
    animation: borderRotate 4s linear infinite;
}

@keyframes borderRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.back-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.6) 50%, 
        transparent 100%);
    transition: left 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
    border-radius: 18px;
}

.back-btn:hover {
    transform: translateY(-4px) scale(1.1) !important;
    box-shadow: 
        0 16px 48px rgba(0, 0, 0, 0.24),
        0 8px 24px rgba(102, 126, 234, 0.20),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.2),
        0 0 20px rgba(102, 126, 234, 0.3) !important;
    background: rgba(255, 255, 255, 0.3) !important;
    backdrop-filter: blur(25px) saturate(200%) !important;
}

.back-btn:hover::before {
    opacity: 1;
    animation-duration: 2s;
}

.back-btn:hover::after {
    left: 100%;
}

.back-btn:active {
    transform: translateY(-2px) scale(1.06) !important;
    transition: all 0.15s ease !important;
}

.back-btn i {
    color: white !important;
    font-size: 1.3rem !important;
    transition: var(--transition-smooth) !important;
    text-shadow: 
        0 2px 6px rgba(0, 0, 0, 0.4),
        0 0 12px rgba(255, 255, 255, 0.3) !important;
    position: relative !important;
    z-index: 2 !important;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.4)) !important;
}

.back-btn:hover i {
    transform: scale(1.1) !important;
    text-shadow: 
        0 3px 8px rgba(0, 0, 0, 0.5),
        0 0 16px rgba(255, 255, 255, 0.5) !important;
    filter: drop-shadow(0 0 12px rgba(255, 255, 255, 0.6)) !important;
}

/* 精美页面标题 */
.page-header h1 {
    font-size: 1.5rem !important;
    font-weight: 700 !important;
    color: var(--title-color) !important;
    text-shadow: var(--title-shadow) !important;
    text-align: center !important;
    flex: 1 !important;
    margin: 0 !important;
    position: relative !important;
    opacity: 1 !important;
    visibility: visible !important;
    letter-spacing: 0.8px !important;
    z-index: 3 !important;
    background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.85) 100%) !important;
    background-clip: text !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.4)) !important;
    animation: titleGlow 4s ease-in-out infinite alternate !important;
}

@keyframes titleGlow {
    0% {
        filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.4));
        text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    }
    100% {
        filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.6));
        text-shadow: 0 3px 15px rgba(0, 0, 0, 0.5), 0 0 10px rgba(255, 255, 255, 0.3);
    }
}

/* 头部占位元素 */
.header-spacer {
    width: var(--btn-size) !important;
    height: var(--btn-size) !important;
    flex-shrink: 0 !important;
}

/* 头部内容区域 */
.header-content {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    position: relative !important;
    z-index: 3 !important;
}

/* 头部发光效果 */
.header-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 250px;
    height: 80px;
    background: radial-gradient(ellipse, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.6;
    animation: headerPulse 6s ease-in-out infinite;
    pointer-events: none;
    z-index: 1;
}

@keyframes headerPulse {
    0%, 100% { 
        opacity: 0.4; 
        transform: translate(-50%, -50%) scale(1);
    }
    50% { 
        opacity: 0.8; 
        transform: translate(-50%, -50%) scale(1.2);
    }
}

/* 统一的页面样式 - 确保所有页面风格一致 */
.benchmark-page .page-header,
.private-card-page .page-header,
.viral-creation .page-header,
.note-creator .page-header,
.product-creation .page-header,
.image-enhancement .page-header,
.image-enhancement-page .page-header {
    background: var(--nav-bg) !important;
    backdrop-filter: var(--nav-backdrop) !important;
    border: 1px solid var(--nav-border) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15) !important;
    box-shadow: var(--nav-shadow) !important;
    min-height: var(--nav-height) !important;
    padding: 16px 24px !important;
}

/* 统一的返回按钮样式 */
.benchmark-page .back-btn,
.private-card-page .back-btn,
.viral-creation .back-btn,
.note-creator .back-btn,
.product-creation .back-btn,
.image-enhancement .back-btn,
.image-enhancement-page .back-btn {
    background: var(--btn-bg) !important;
    backdrop-filter: blur(15px) !important;
    border: 2px solid var(--btn-border) !important;
    color: white !important;
    width: var(--btn-size) !important;
    height: var(--btn-size) !important;
    border-radius: 16px !important;
    box-shadow: var(--btn-shadow) !important;
}

.benchmark-page .back-btn:hover,
.private-card-page .back-btn:hover,
.viral-creation .back-btn:hover,
.note-creator .back-btn:hover,
.product-creation .back-btn:hover,
.image-enhancement .back-btn:hover,
.image-enhancement-page .back-btn:hover {
    background: rgba(255, 255, 255, 0.25) !important;
    border-color: rgba(255, 255, 255, 0.5) !important;
    transform: translateY(-3px) scale(1.08) !important;
    box-shadow: var(--btn-hover-shadow) !important;
}

/* 统一的标题样式 */
.benchmark-page .page-header h1,
.private-card-page .page-header h1,
.viral-creation .page-header h1,
.note-creator .page-header h1,
.product-creation .page-header h1,
.image-enhancement .page-header h1,
.image-enhancement-page .page-header h1 {
    background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.85) 100%) !important;
    background-clip: text !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.4)) !important;
    font-size: 1.5rem !important;
    font-weight: 700 !important;
    letter-spacing: 0.8px !important;
    animation: titleGlow 4s ease-in-out infinite alternate !important;
}

/* 移动端适配 */
@media screen and (max-width: 768px) {
    :root {
        --nav-height: 60px;
        --btn-size: 42px;
    }
    
    .page-header {
        padding: 12px 18px !important;
        min-height: var(--nav-height) !important;
    }
    
    .page-header h1 {
        font-size: 1.3rem !important;
        letter-spacing: 0.6px !important;
    }
    
    .back-btn {
        width: var(--btn-size) !important;
        height: var(--btn-size) !important;
        font-size: 1.2rem !important;
        border-radius: 14px !important;
    }
    
    .header-spacer {
        width: var(--btn-size) !important;
        height: var(--btn-size) !important;
    }
    
    .header-glow {
        width: 200px;
        height: 60px;
    }
}

@media screen and (max-width: 375px) {
    :root {
        --nav-height: 56px;
        --btn-size: 38px;
    }
    
    .page-header {
        padding: 10px 14px !important;
    }
    
    .page-header h1 {
        font-size: 1.2rem !important;
        letter-spacing: 0.5px !important;
    }
    
    .back-btn {
        width: var(--btn-size) !important;
        height: var(--btn-size) !important;
        font-size: 1.1rem !important;
        border-radius: 12px !important;
    }
    
    .header-spacer {
        width: var(--btn-size) !important;
        height: var(--btn-size) !important;
    }
    
    .header-glow {
        width: 180px;
        height: 50px;
    }
}

/* 横屏适配 */
@media screen and (orientation: landscape) and (max-height: 500px) {
    :root {
        --nav-height: 50px;
        --btn-size: 36px;
    }
    
    .page-header {
        padding: 8px 16px !important;
        min-height: var(--nav-height) !important;
    }
    
    .page-header h1 {
        font-size: 1.1rem !important;
        letter-spacing: 0.4px !important;
    }
    
    .back-btn {
        width: var(--btn-size) !important;
        height: var(--btn-size) !important;
        font-size: 1rem !important;
        border-radius: 10px !important;
    }
    
    .header-spacer {
        width: var(--btn-size) !important;
        height: var(--btn-size) !important;
    }
    
    .header-glow {
        width: 150px;
        height: 40px;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .page-header {
        background: linear-gradient(135deg, rgba(0, 0, 0, 0.95) 0%, rgba(25, 25, 25, 0.95) 100%) !important;
        border-color: rgba(255, 255, 255, 0.8) !important;
    }
    
    .back-btn {
        background: rgba(255, 255, 255, 0.9) !important;
        color: #000000 !important;
        border-color: #000000 !important;
    }
    
    .page-header h1 {
        background: #ffffff !important;
        background-clip: text !important;
        -webkit-background-clip: text !important;
        -webkit-text-fill-color: transparent !important;
        filter: none !important;
        text-shadow: none !important;
    }
}

/* 减少动画模式 */
@media (prefers-reduced-motion: reduce) {
    .back-btn,
    .page-header,
    .header-glow,
    .page-header h1 {
        animation: none !important;
        transition: none !important;
    }
    
    .back-btn::before,
    .back-btn::after,
    .page-header::before,
    .page-header::after {
        display: none !important;
    }
}

/* 焦点状态 */
.back-btn:focus {
    outline: 3px solid rgba(255, 255, 255, 0.8) !important;
    outline-offset: 2px !important;
}

.back-btn:focus:not(:focus-visible) {
    outline: none !important;
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .back-btn:hover {
        transform: none !important;
    }
    
    .back-btn:active {
        transform: scale(0.95) !important;
        transition: transform 0.1s ease !important;
    }
}

/* 强制显示和交互修复 */
body .page-header .back-btn,
.page-header .back-btn,
.image-enhancement-page .page-header .back-btn,
.product-creation .page-header .back-btn,
.viral-creation .page-header .back-btn,
.benchmark-page .page-header .back-btn {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    position: relative !important;
    z-index: 103 !important;
    pointer-events: auto !important;
    cursor: pointer !important;
}

/* 深色主题支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --nav-bg: linear-gradient(135deg, rgba(45, 55, 72, 0.95) 0%, rgba(55, 65, 81, 0.95) 100%);
        --nav-border: rgba(255, 255, 255, 0.15);
        --btn-bg: rgba(255, 255, 255, 0.1);
        --btn-border: rgba(255, 255, 255, 0.2);
        --title-color: #e2e8f0;
    }
}