:root {
    --color-bg: #FFFFFF;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-brand: #B89A67;
    --color-border: #F0F0F0;
    --color-card-bg: #FAFAFA;
    --color-mask: rgba(0,0,0,0.7);
    --color-dark-bg: #000000;

    --font-size-h1: 28px;
    --font-size-h2: 20px;
    --font-size-h3: 16px;
    --font-size-body: 14px;
    --font-size-mini: 12px;
    --font-size-btn: 15px;

    --font-bold: 600;
    --font-medium: 500;
    --font-regular: 400;

    --spacing-page: 24px;
    --spacing-section: 32px;
    --spacing-card: 16px;
    --spacing-sm: 12px;
    --spacing-xs: 8px;

    --radius-card: 8px;
    --radius-tag: 4px;
    --radius-btn: 8px;

    --transition-normal: all 0.3s ease-out;
}

html {
    background-color: var(--color-bg);
    color: var(--color-text-primary);
}

body {
    min-height: 100vh;
    font-size: var(--font-size-body);
    font-weight: var(--font-regular);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-page);
}

.hide {
    display: none !important;
}

.show {
    display: block !important;
}

.text-ellipsis {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.safe-bottom {
    padding-bottom: env(safe-area-inset-bottom);
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-desc {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-section);
}

.card {
    background-color: var(--color-card-bg);
    border-radius: var(--radius-card);
    padding: var(--spacing-card);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-btn);
    font-weight: var(--font-medium);
    border-radius: var(--radius-btn);
    transition: var(--transition-normal);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-brand);
    color: #FFFFFF;
}

.btn-primary:active {
    opacity: 0.8;
}

.tag {
    display: inline-block;
    font-size: var(--font-size-mini);
    color: var(--color-brand);
    background-color: rgba(184, 154, 103, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-tag);
}

.divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-sm) 0;
}

.page-main {
    padding-bottom: 80px;
}

.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: #FFFFFF;
    border-top: 1px solid var(--color-border);
    display: flex;
    z-index: 999;
    padding-bottom: env(safe-area-inset-bottom);
}

.tab-bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
    font-size: var(--font-size-mini);
    transition: var(--transition-normal);
    cursor: pointer;
}

.tab-bar-item.active {
    color: var(--color-brand);
}

.tab-bar-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 4px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.tab-bar-item.home .tab-bar-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z'/%3E%3Cpolyline points='9 22 9 12 15 12 15 22'/%3E%3C/svg%3E");
}

.tab-bar-item.category .tab-bar-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z'/%3E%3C/svg%3E");
}

.tab-bar-item.technique .tab-bar-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpolyline points='12 6 12 12 16 14'/%3E%3C/svg%3E");
}

.tab-bar-item.contact .tab-bar-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M21 11.5a8.38 8.38 0 0 1-.9 3.8 8.5 8.5 0 0 1-7.6 4.7 8.38 8.38 0 0 1-3.8-.9L3 21l1.9-5.7a8.38 8.38 0 0 1-.9-3.8 8.5 8.5 0 0 1 4.7-7.6 8.38 8.38 0 0 1 3.8-.9h.5a8.48 8.48 0 0 1 8 8v.5z'/%3E%3C/svg%3E");
}

.tab-bar-item .tab-bar-icon {
    filter: grayscale(100%);
}

.tab-bar-item.active .tab-bar-icon {
    filter: grayscale(0%);
}

.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 44px;
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-page);
    z-index: 999;
    padding-top: env(safe-area-inset-top);
    height: calc(44px + env(safe-area-inset-top));
    transition: var(--transition-normal);
}

.nav-bar.immersive {
    background-color: transparent;
    border-bottom: none;
    color: #FFFFFF;
}

.nav-bar.immersive.scrolled {
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.nav-bar-left {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    cursor: pointer;
}

.nav-bar-title {
    flex: 1;
    text-align: center;
    font-size: var(--font-size-h3);
    font-weight: var(--font-bold);
}

.nav-bar-right {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.nav-bar-back {
    width: 24px;
    height: 24px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M19 12H5'/%3E%3Cpolyline points='12 19 5 12 12 5'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.modal-mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-mask);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal-mask.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: #FFFFFF;
    border-radius: var(--radius-card);
    width: calc(100% - 48px);
    max-width: 400px;
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal-mask.show .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-section) var(--spacing-card) var(--spacing-sm);
    text-align: center;
}

.modal-title {
    font-size: var(--font-size-h2);
    font-weight: var(--font-bold);
}

.modal-body {
    padding: 0 var(--spacing-card) var(--spacing-section);
    text-align: center;
}

.modal-footer {
    padding: var(--spacing-sm) var(--spacing-card) var(--spacing-card);
    display: flex;
    border-top: 1px solid var(--color-border);
}

.modal-btn {
    flex: 1;
    padding: 12px;
    text-align: center;
    font-size: var(--font-size-btn);
    cursor: pointer;
    transition: var(--transition-normal);
}

.modal-btn.cancel {
    color: var(--color-text-secondary);
    border-right: 1px solid var(--color-border);
}

.modal-btn.confirm {
    color: var(--color-brand);
}

.drawer-mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-mask);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.drawer-mask.show {
    opacity: 1;
    visibility: visible;
}

.drawer-content {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border-radius: var(--radius-card) var(--radius-card) 0 0;
    transform: translateY(100%);
    transition: var(--transition-normal);
    max-height: 80vh;
    overflow-y: auto;
    padding-bottom: env(safe-area-inset-bottom);
}

.drawer-mask.show .drawer-content {
    transform: translateY(0);
}

.drawer-header {
    padding: var(--spacing-card);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.drawer-title {
    font-size: var(--font-size-h3);
    font-weight: var(--font-bold);
}

.drawer-close {
    position: absolute;
    right: var(--spacing-card);
    top: var(--spacing-card);
    width: 24px;
    height: 24px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cline x1='18' y1='6' x2='6' y2='18'/%3E%3Cline x1='6' y1='6' x2='18' y2='18'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    cursor: pointer;
}

.drawer-body {
    padding: var(--spacing-card);
}

.toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--color-mask);
    color: #FFFFFF;
    padding: 12px 24px;
    border-radius: var(--radius-tag);
    font-size: var(--font-size-body);
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    transition: var(--transition-normal);
}

.toast.show {
    opacity: 1;
}

.page-transition {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skeleton {
    background: linear-gradient(90deg, #F0F0F0 25%, #FAFAFA 50%, #F0F0F0 75%);
    background-size: 200% 100%;
    animation: skeletonLoading 1.5s infinite;
}

@keyframes skeletonLoading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-block {
    border-radius: var(--radius-tag);
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
    border-radius: 4px;
}

.skeleton-text.short {
    width: 60%;
}

.skeleton-text.medium {
    width: 80%;
}

.loading-mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.loading-mask.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-brand);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    margin-top: 12px;
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
}

.quick-action-btn {
    position: fixed;
    bottom: 100px;
    right: var(--spacing-page);
    width: 48px;
    height: 48px;
    background-color: var(--color-brand);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 998;
    box-shadow: 0 4px 12px rgba(184, 154, 103, 0.3);
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.quick-action-btn::before {
    content: '';
    width: 24px;
    height: 24px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFFFFF' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpolyline points='12 6 12 12 16 14'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.bottom-action-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: #FFFFFF;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-page);
    padding-bottom: env(safe-area-inset-bottom);
    border-top: 1px solid var(--color-border);
    z-index: 999;
}

.action-btn {
    flex: 1;
    height: 40px;
    border-radius: var(--radius-btn);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-btn);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: var(--transition-normal);
}

.action-btn-secondary {
    background-color: var(--color-card-bg);
    color: var(--color-text-primary);
    margin-right: var(--spacing-sm);
}

.action-btn-primary {
    background-color: var(--color-brand);
    color: #FFFFFF;
}

.color-dot {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    flex-shrink: 0;
    cursor: pointer;
    transition: var(--transition-normal);
}

.color-dot:active {
    transform: scale(0.9);
}

.color-name {
    font-size: var(--font-size-mini);
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: 4px;
}

.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-mask);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.qr-modal.show {
    opacity: 1;
    visibility: visible;
}

.qr-content {
    background-color: #FFFFFF;
    border-radius: var(--radius-card);
    padding: var(--spacing-section);
    text-align: center;
    width: calc(100% - 48px);
    max-width: 320px;
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.qr-modal.show .qr-content {
    transform: scale(1);
}

.qr-code {
    width: 180px;
    height: 180px;
    background-color: #FFFFFF;
    border: 1px solid var(--color-border);
    margin: 0 auto var(--spacing-card);
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-code::before {
    content: '二维码';
    color: var(--color-text-tertiary);
    font-size: var(--font-size-mini);
}

.qr-desc {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-card);
}

.qr-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--color-card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    cursor: pointer;
}

.qr-close::before {
    content: '';
    width: 16px;
    height: 16px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23999999' stroke-width='2'%3E%3Cline x1='18' y1='6' x2='6' y2='18'/%3E%3Cline x1='6' y1='6' x2='18' y2='18'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.image-zoom-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.9);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.image-zoom-modal.show {
    opacity: 1;
    visibility: visible;
}

.zoom-image {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: var(--spacing-sm);
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: var(--transition-normal);
}

.carousel-dot.active {
    background-color: #FFFFFF;
}

@media (min-width: 768px) {
    .container {
        padding: 0 calc((100% - 1200px) / 2 + var(--spacing-page));
    }
    
    .tab-bar {
        display: none;
    }
    
    .page-main {
        padding-bottom: 0;
    }
}