/* ===== QingPDF Navigation Bar Styles ===== */

:root {
    --nav-height: 76px;
    --nav-height-scrolled: 68px;
    --primary-color: #0D9488;
    --primary-light: #14B8A6;
    --primary-dark: #0F766E;
    --primary-accent: #2DD4BF;
    --text-primary: #134E4A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --bg-glass: rgba(255, 255, 255, 0.92);
    --bg-glass-scrolled: rgba(255, 255, 255, 0.98);
    --border-subtle: rgba(13, 148, 136, 0.12);
    --shadow-soft: 0 4px 24px rgba(13, 148, 136, 0.10);
    --shadow-medium: 0 8px 40px rgba(13, 148, 136, 0.16);
}

* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-smooth: always;
    text-rendering: optimizeLegibility;
}

body.has-fixed-nav {
    padding-top: calc(var(--nav-height) + 16px);
}

.qingpdf-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: var(--bg-glass);
    backdrop-filter: blur(32px) saturate(180%);
    -webkit-backdrop-filter: blur(32px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    transition: all 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
    height: var(--nav-height);
    display: flex;
    align-items: center;
}

.qingpdf-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #0D9488 20%, 
        #14B8A6 50%, 
        #2DD4BF 80%, 
        transparent 100%);
    opacity: 0;
    transition: opacity 0.5s ease;
}

.qingpdf-nav.scrolled {
    background: var(--bg-glass-scrolled);
    box-shadow: var(--shadow-soft);
    height: 68px;
}

.qingpdf-nav.scrolled::before {
    opacity: 1;
}

.qingpdf-nav-container {
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    padding: 0 36px;
    display: flex;
    align-items: center;
    gap: 100px;
}

.qingpdf-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    transition: transform 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
    text-decoration: none;
    position: relative;
}

.qingpdf-logo::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #0D9488, #14B8A6, #2DD4BF);
    border-radius: 2px;
    transition: width 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
    opacity: 0;
}

.qingpdf-logo:hover::after {
    width: 60%;
    opacity: 1;
}

.qingpdf-logo:hover {
    transform: scale(1.03);
}

.qingpdf-logo img {
    display: none;
    width: 46px;
    height: 46px;
    border-radius: 16px;
    box-shadow: 0 8px 28px rgba(99, 102, 241, 0.28);
    transition: all 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-logo:hover img {
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.40);
    transform: scale(1.08) rotate(-3deg);
}

.qingpdf-logo-text {
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 700;
    font-size: 24px;
    color: #134E4A;
    letter-spacing: -0.5px;
    transition: color 0.4s ease, transform 0.4s ease;
    animation: textSlideIn 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) 0s both;
    white-space: nowrap;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@keyframes textSlideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.qingpdf-logo:hover .qingpdf-logo-text {
    color: #0D9488;
    transform: scale(1.02);
}

.qingpdf-nav-links {
    flex: 1;
    display: none;
    align-items: center;
    gap: 80px;
    justify-content: center;
    animation: linksFadeIn 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) 0s both;
    margin: 0;
}

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

@media (min-width: 900px) {
    .qingpdf-nav-links {
        flex: 1;
        display: flex;
        flex-wrap: nowrap;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .qingpdf-nav-links::-webkit-scrollbar {
        display: none;
    }
}

.qingpdf-nav-item {
    position: relative;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 600;
    font-size: 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
    padding: 16px 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 12px;
    letter-spacing: -0.2px;
    overflow: visible;
    white-space: nowrap !important;
    flex-shrink: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.qingpdf-nav-item::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #0D9488, #14B8A6);
    border-radius: 1px;
    transition: width 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-nav-item:hover::after {
    width: calc(100% - 36px);
}

.qingpdf-nav-item:hover {
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.08) 0%, rgba(20, 184, 166, 0.04) 100%);
}

.qingpdf-nav-item.active {
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.12) 0%, rgba(20, 184, 166, 0.06) 100%);
}

.qingpdf-nav-item.active::after {
    width: calc(100% - 36px);
}

.qingpdf-nav-dropdown {
    position: relative;
    display: inline-block;
}

.qingpdf-nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
}

.qingpdf-nav-dropdown-toggle i {
    font-size: 11px;
    transition: transform 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-nav-dropdown:hover .qingpdf-nav-dropdown-toggle i {
    transform: rotate(180deg);
}

.qingpdf-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 260px;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-subtle);
    padding: 8px 0;
    z-index: 1000;
    overflow: hidden;
    white-space: nowrap;
    transition: opacity 0.3s cubic-bezier(0.22, 0.61, 0.36, 1), box-shadow 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-dropdown-menu.dropdown-two-columns {
    min-width: 480px;
    max-width: 90vw;
    padding: 12px 16px;
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 8px 24px;
}

.dropdown-column {
    display: flex;
    flex-direction: column;
}

.dropdown-two-columns .qingpdf-dropdown-item {
    white-space: nowrap;
    break-inside: avoid;
    page-break-inside: avoid;
    font-size: 15px;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: -0.05em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    text-align: left;
    justify-content: flex-start;
    width: 100%;
    box-sizing: border-box;
}

.qingpdf-dropdown-menu::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #0D9488, #14B8A6, #2DD4BF);
    opacity: 0.85;
}


.qingpdf-nav-dropdown:hover .qingpdf-dropdown-menu {
    display: block;
    animation: qingpdfDropdownFadeIn 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-nav-dropdown:hover .qingpdf-dropdown-menu.dropdown-two-columns {
    display: grid !important;
    animation: qingpdfDropdownFadeIn 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

nav#qingpdfNav .qingpdf-nav-links .qingpdf-nav-dropdown:hover .qingpdf-dropdown-menu.columns-3 {
    display: grid !important;
}

@keyframes qingpdfDropdownFadeIn {
    from { 
        opacity: 0; 
        transform: translateX(-50%) translateY(-10px);
        box-shadow: 0 4px 12px rgba(99, 102, 241, 0.06);
    }
    to { 
        opacity: 1; 
        transform: translateX(-50%) translateY(0);
        box-shadow: var(--shadow-medium);
    }
}

.qingpdf-dropdown-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 15px;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: -0.05em;
    transition: all 0.25s cubic-bezier(0.22, 0.61, 0.36, 1);
    white-space: nowrap;
    position: relative;
    margin: 1px 4px;
    border-radius: 8px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

.qingpdf-dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: linear-gradient(180deg, #0D9488, #14B8A6);
    border-radius: 2px;
    opacity: 0;
    transition: all 0.25s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-dropdown-item:hover {
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.10) 0%, rgba(20, 184, 166, 0.05) 100%);
    color: #0D9488;
    padding-left: 28px;
    transform: translateX(2px);
}

.qingpdf-dropdown-item:hover::before {
    opacity: 1;
    height: 60%;
}

.qingpdf-dropdown-header {
    padding: 10px 20px 6px;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.2px;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.qingpdf-dropdown-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(13, 148, 136, 0.2), transparent);
}

.columns-3 .qingpdf-dropdown-header {
    padding: 8px 16px 4px;
    font-size: 11px;
    letter-spacing: 1px;
}

.columns-3 .qingpdf-dropdown-item {
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 15px;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: -0.05em;
    margin: 2px 4px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

.columns-3 .qingpdf-dropdown-item:hover {
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.10) 0%, rgba(20, 184, 166, 0.05) 100%);
    color: #0D9488;
    padding-left: 24px;
    transform: translateX(2px);
}

.columns-3 .qingpdf-dropdown-item:hover::before {
    opacity: 1;
    height: 60%;
}

.qingpdf-dropdown-section {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.qingpdf-nav-spacer {
    justify-self: end;
    width: 120px;
}

.qingpdf-nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
    justify-self: end;
    order: 3;
    margin-left: auto;
}

.qingpdf-nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    background: transparent;
    border: none;
    cursor: pointer;
    display: none;
    border-radius: 10px;
    transition: background 0.3s ease;
    justify-self: end;
}

.qingpdf-nav-toggle:hover {
    background: rgba(99, 102, 241, 0.08);
}

@media (max-width: 899px) {
    .qingpdf-nav-container {
        grid-template-columns: auto 1fr auto;
        padding: 0 16px;
    }

    .qingpdf-nav-toggle {
        display: flex;
        padding: 12px;
    }

    .qingpdf-nav-toggle span {
        width: 24px;
        height: 2.5px;
    }

    .qingpdf-nav-spacer {
        display: none;
    }
    
    .qingpdf-nav {
        height: 64px;
    }

    .qingpdf-nav.scrolled {
        height: 60px;
    }

    .qingpdf-nav-links {
        flex: 1;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.99);
        backdrop-filter: blur(32px) saturate(180%);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        box-shadow: var(--shadow-medium);
        border-bottom: 1px solid var(--border-subtle);
        display: none;
        overflow-y: auto;
        z-index: 9998;
    }

    .qingpdf-nav-links.active {
        display: flex;
        animation: slideDown 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
    }

    @keyframes slideDown {
        from { 
            opacity: 0; 
            transform: translateY(-12px);
        }
        to { 
            opacity: 1; 
            transform: translateY(0);
        }
    }

    .qingpdf-nav-item {
        padding: 16px 20px;
        border-radius: 12px;
        width: 100%;
        font-size: 16px;
        min-height: 48px;
    }

    .qingpdf-nav-item:hover {
        background: rgba(13, 148, 136, 0.08);
    }

    .qingpdf-nav-item:active {
        background: rgba(13, 148, 136, 0.12);
    }

    .qingpdf-dropdown-menu {
        position: static;
        transform: none !important;
        box-shadow: none;
        border: 1px solid var(--border-subtle);
        margin-top: 4px;
        margin-left: 12px;
        display: none;
        border-radius: 10px;
        width: calc(100% - 24px);
        max-height: 400px;
        overflow-y: auto;
    }

    .qingpdf-nav-dropdown:hover .qingpdf-dropdown-menu {
        display: block;
        animation: none;
    }

    .qingpdf-nav-links.active .qingpdf-dropdown:hover .qingpdf-dropdown-menu {
        display: block;
    }

    .qingpdf-dropdown-item {
        padding: 14px 16px;
        font-size: 15px;
        font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
        font-weight: 500;
        line-height: 1.6;
        letter-spacing: -0.05em;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        text-rendering: optimizeLegibility;
    }

    .qingpdf-dropdown-header {
        padding: 12px 16px 8px;
    }
}

@media (max-width: 480px) {
    .qingpdf-nav-container {
        padding: 0 12px;
    }

    .qingpdf-logo-text {
        font-size: 20px;
    }

    .qingpdf-logo img {
    display: none;
        width: 40px;
        height: 40px;
    }

    .qingpdf-nav-item {
        padding: 14px 16px;
        font-size: 20px;
    }
}

.qingpdf-nav-toggle span {
    width: 26px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.qingpdf-nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(8px);
}

.qingpdf-nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0.5);
}

.qingpdf-nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-8px);
}

.dark-mode-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 20px;
    transition: all 0.3s ease;
    margin-right: 8px;
}

.dark-mode-toggle:hover {
    background: rgba(13, 148, 136, 0.08);
    color: var(--primary-color);
}

.dark-mode-toggle:active {
    background: rgba(13, 148, 136, 0.12);
}

@media (max-width: 899px) {
    .dark-mode-toggle {
        margin-right: 0;
    }
}

.dark .qingpdf-nav {
    background: rgba(15, 23, 42, 0.95);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.dark .qingpdf-nav.scrolled {
    background: rgba(15, 23, 42, 0.98);
}

.dark .qingpdf-logo-text {
    color: #f1f5f9;
}

.dark .qingpdf-logo:hover .qingpdf-logo-text {
    color: #2dd4bf;
}

.dark .qingpdf-nav-item {
    color: #cbd5e1;
}

.dark .qingpdf-nav-item:hover {
    background: rgba(45, 212, 191, 0.1);
    color: #f1f5f9;
}

.dark .qingpdf-nav-item.active {
    background: rgba(45, 212, 191, 0.15);
    color: #f1f5f9;
}

.dark .qingpdf-dropdown-menu {
    background: rgba(30, 41, 59, 0.98);
    border-color: rgba(255, 255, 255, 0.1);
}

.dark .qingpdf-dropdown-item {
    color: #cbd5e1;
}

.dark .qingpdf-dropdown-item:hover {
    background: rgba(45, 212, 191, 0.1);
    color: #2dd4bf;
}

.dark .qingpdf-dropdown-header {
    color: #94a3b8;
}

.dark .qingpdf-nav-toggle span {
    background: #f1f5f9;
}

.dark .dark-mode-toggle {
    color: #cbd5e1;
}

.dark .dark-mode-toggle:hover {
    color: #2dd4bf;
}

.dark .qingpdf-lang-switcher {
    background: rgba(255, 255, 255, 0.05);
}

.dark .qingpdf-lang-btn {
    color: #cbd5e1;
}

.dark .qingpdf-lang-btn.active {
    background: rgba(45, 212, 191, 0.2);
    color: #2dd4bf;
}

.qingpdf-nav-dropdown:hover > .qingpdf-dropdown-menu {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateX(-50%) translateY(0) !important;
}

.qingpdf-nav-dropdown:hover > .qingpdf-dropdown-menu.dropdown-two-columns {
    display: grid !important;
}

.qingpdf-nav-dropdown:hover > .qingpdf-dropdown-menu.columns-3 {
    display: grid !important;
}

.qingpdf-nav-actions {
    display: flex !important;
    visibility: visible;
    opacity: 1;
}

/* ===== Login Button Styles ===== */
#qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn,
nav#qingpdfNav .qingpdf-nav-login-btn,
.qingpdf-nav-login-btn {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 6px !important;
    padding: 8px 18px !important;
    background: linear-gradient(135deg, #0D9488, #0F766E) !important;
    color: #fff !important;
    border: none !important;
    border-radius: 10px !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.25) !important;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif !important;
    min-height: 40px !important;
    white-space: nowrap !important;
    line-height: 1 !important;
    text-decoration: none !important;
    outline: none !important;
    appearance: none !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
}

#qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn:hover,
nav#qingpdfNav .qingpdf-nav-login-btn:hover,
.qingpdf-nav-login-btn:hover {
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.35) !important;
    background: linear-gradient(135deg, #0F766E, #0D9488) !important;
}

#qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn:active,
nav#qingpdfNav .qingpdf-nav-login-btn:active,
.qingpdf-nav-login-btn:active {
    transform: translateY(0) scale(0.97) !important;
    box-shadow: 0 1px 4px rgba(13, 148, 136, 0.2) !important;
}

#qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn:focus,
nav#qingpdfNav .qingpdf-nav-login-btn:focus,
.qingpdf-nav-login-btn:focus {
    outline: none !important;
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.3) !important;
}

#qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn svg,
nav#qingpdfNav .qingpdf-nav-login-btn svg,
.qingpdf-nav-login-btn svg {
    width: 16px !important;
    height: 16px !important;
    flex-shrink: 0 !important;
    fill: none !important;
    stroke: currentColor !important;
    stroke-width: 2.2 !important;
    stroke-linecap: round !important;
    stroke-linejoin: round !important;
}

#qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-text,
nav#qingpdfNav .qingpdf-nav-login-text,
.qingpdf-nav-login-text {
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif !important;
    font-weight: 600 !important;
    font-size: 14px !important;
    line-height: 1 !important;
    color: #fff !important;
}

/* ===== User Menu Styles ===== */
.qingpdf-nav-user {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    position: relative;
    padding: 4px 8px;
    border-radius: 10px;
    transition: background 0.2s;
}

.qingpdf-nav-user:hover {
    background: rgba(13, 148, 136, 0.06);
}

.qingpdf-nav-user img {
    width: 32px !important;
    height: 32px !important;
    border-radius: 50% !important;
    object-fit: cover !important;
    border: 2px solid #E2E8F0 !important;
    display: inline-flex !important;
    flex-shrink: 0 !important;
}

.qingpdf-nav-user .qingpdf-nav-username {
    font-size: 14px !important;
    color: #334155 !important;
    font-weight: 500 !important;
    max-width: 80px !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    white-space: nowrap !important;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif !important;
    display: inline-flex !important;
    align-items: center !important;
    flex-shrink: 0 !important;
}

.qingpdf-nav-username.is-vip {
    color: #0D9488 !important;
    font-weight: 600 !important;
}

.qingpdf-nav-username.is-free {
    color: #64748B !important;
}

.qingpdf-nav-user > span,
.qingpdf-nav-user > svg {
    display: inline-flex !important;
    align-items: center !important;
    flex-shrink: 0 !important;
}

#qingpdf-nav-container .qingpdf-nav-user img {
    display: inline-flex !important;
}

#qingpdf-nav-container .qingpdf-nav-user span {
    display: inline-flex !important;
}

.vip-badge {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: #fff;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 8px;
    font-weight: 600;
    line-height: 1;
}

/* ===== Dropdown (redesigned) ===== */
.qingpdf-user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 12px;
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 16px 48px rgba(15, 23, 42, 0.16), 0 2px 8px rgba(15, 23, 42, 0.06);
    min-width: 268px;
    z-index: 1000;
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.9);
    transform-origin: top right;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.97);
    transition: opacity 0.18s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.18s;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.qingpdf-user-dropdown.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* 点击空白处遮罩，提升层级焦点与误触防护 */
.qingpdf-dropdown-scrim {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.28);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
    z-index: 999;
}

.qingpdf-dropdown-scrim.is-visible {
    opacity: 1;
    visibility: visible;
}

/* 菜单项错落入场动画 */
.qingpdf-dropdown-stagger {
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.22s ease, transform 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

.qingpdf-user-dropdown.is-visible .qingpdf-dropdown-stagger {
    opacity: 1;
    transform: translateY(0);
}

/* 触发按钮可见焦点环（键盘可达性） */
.qingpdf-nav-user:focus-visible {
    outline: none;
    background: rgba(13, 148, 136, 0.1);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.35);
}

/* 菜单项按下反馈（80-150ms 内可见） */
.qingdf-dropdown-item:active,
.qingpdf-vip-modal-btn:active,
.qingdf-dropdown-id-copy:active {
    transform: scale(0.97);
}

/* VIP 按钮 hover 抬升 + 图标轻微旋转 */
.qingdf-dropdown-vipbtn:hover svg {
    transform: rotate(-8deg) scale(1.08);
}

.qingdf-dropdown-vipbtn svg {
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 复制成功脉冲反馈 */
.qingdf-dropdown-id-copy.is-copied {
    animation: qingdf-copy-pulse 0.4s ease;
}

@keyframes qingdf-copy-pulse {
    0% { transform: scale(1); }
    40% { transform: scale(1.08); }
    100% { transform: scale(1); }
}

.qingpdf-nav-arrow {
    display: inline-flex;
    align-items: center;
    color: #94A3B8;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s;
}

.qingpdf-nav-arrow-svg {
    width: 14px;
    height: 14px;
}

.qingpdf-nav-user.is-open .qingpdf-nav-arrow {
    transform: rotate(180deg);
    color: #0D9488;
}

/* 头部卡片 */
.qingpdf-dropdown-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 18px 16px;
    background: linear-gradient(135deg, #F0FDFA 0%, #ECFEFF 100%);
    border-bottom: 1px solid #F1F5F9;
}

.qingdf-dropdown-avatarwrap {
    position: relative;
    flex-shrink: 0;
}

.qingdf-dropdown-avatar {
    width: 48px !important;
    height: 48px !important;
    border-radius: 50% !important;
    object-fit: cover !important;
    border: 2px solid #fff !important;
    box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.35);
    display: block !important;
}

.qingdf-dropdown-avatarcrown {
    position: absolute;
    right: -4px;
    bottom: -4px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(217, 119, 6, 0.4);
}

.qingdf-dropdown-avatarcrown svg {
    width: 13px;
    height: 13px;
}

.qingdf-dropdown-info {
    min-width: 0;
    flex: 1;
}

.qingdf-dropdown-name {
    font-size: 15px;
    font-weight: 600;
    color: #0F172A;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.qingdf-dropdown-status {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 6px;
    font-size: 13px;
    color: #475569;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.qingdf-dropdown-role {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 999px;
    font-weight: 600;
    line-height: 1.4;
}

.qingdf-role-vip {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
    color: #B45309;
}

.qingdf-role-free {
    background: #F1F5F9;
    color: #64748B;
}

.qingdf-role-vip .qingpdf-nav-vipbadge {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: #fff;
    font-size: 10px;
    padding: 1px 5px;
    border-radius: 6px;
    font-weight: 700;
    line-height: 1.3;
}

.qingdf-role-free .vip-dot,
.qingdf-role-free .free-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

/* 用户ID复制 */
.qingdf-dropdown-id-copy {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px 7px;
    border-radius: 999px;
    background: rgba(13, 148, 136, 0.08);
    color: #0D9488;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    font-family: 'SF Mono', 'Roboto Mono', monospace;
    transition: background 0.15s, transform 0.15s;
}

.qingdf-dropdown-id-copy:hover {
    background: rgba(13, 148, 136, 0.16);
}

.qingdf-dropdown-id-copy:active {
    transform: scale(0.95);
}

.qingdf-dropdown-id-copy.is-copied {
    background: #D1FAE5;
    color: #047857;
}

.qingdf-copy-icon {
    display: inline-flex;
    width: 11px;
    height: 11px;
}

.qingdf-copy-icon svg {
    width: 11px;
    height: 11px;
}

/* VIP 按钮 */
.qingdf-dropdown-vipbtn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: calc(100% - 36px);
    margin: 14px 18px 4px;
    padding: 11px 16px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #0D9488, #0E7490);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
    transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s, filter 0.2s;
}

.qingdf-dropdown-vipbtn svg {
    width: 17px;
    height: 17px;
    flex-shrink: 0;
}

.qingdf-dropdown-vipbtn:hover {
    filter: brightness(1.05);
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.42);
}

.qingdf-dropdown-vipbtn:active {
    transform: translateY(0) scale(0.98);
}

.qingdf-vipbtn-tip {
    font-size: 11px;
    font-weight: 500;
    opacity: 0.85;
    margin-left: auto;
}

.qingdf-dropdown-divider {
    height: 1px;
    background: #F1F5F9;
    margin: 8px 0;
}

/* 菜单项 */
.qingdf-dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 18px;
    color: #334155;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.16s, color 0.16s;
    position: relative;
}

.qingdf-dropdown-item:hover,
.qingdf-dropdown-item:focus-visible {
    background: rgba(13, 148, 136, 0.06);
    color: #0D9488;
    outline: none;
}

.qingdf-dropdown-item:focus-visible {
    box-shadow: inset 3px 0 0 #0D9488;
}

.qingdf-dropdown-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: #F1F5F9;
    color: #475569;
    flex-shrink: 0;
    transition: background 0.16s, color 0.16s;
}

.qingdf-dropdown-item:hover .qingdf-dropdown-icon,
.qingdf-dropdown-item:focus-visible .qingdf-dropdown-icon {
    background: rgba(13, 148, 136, 0.12);
    color: #0D9488;
}

.qingdf-dropdown-icon svg {
    width: 17px;
    height: 17px;
}

.qingdf-dropdown-text {
    flex: 1;
    min-width: 0;
}

.qingdf-dropdown-title {
    font-size: 15px;
    font-weight: 500;
    color: inherit;
    line-height: 1.4;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.qingdf-dropdown-desc {
    font-size: 12px;
    color: #94A3B8;
    line-height: 1.4;
    margin-top: 2px;
    font-family: 'Noto Sans CJK', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.qingdf-dropdown-item:hover .qingdf-dropdown-desc {
    color: #5EABA2;
}

.qingdf-dropdown-chevron {
    display: inline-flex;
    color: #CBD5E1;
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 0.16s, transform 0.16s, color 0.16s;
    flex-shrink: 0;
}

.qingdf-dropdown-item:hover .qingdf-dropdown-chevron,
.qingdf-dropdown-item:focus-visible .qingdf-dropdown-chevron {
    opacity: 1;
    transform: translateX(0);
    color: #0D9488;
}

.qingdf-dropdown-chevron svg {
    width: 16px;
    height: 16px;
}

/* 退出登录 */
.qingdf-dropdown-item.qingdf-dropdown-item--logout {
    color: #DC2626;
}

.qingdf-dropdown-item.qingdf-dropdown-item--logout:hover,
.qingdf-dropdown-item.qingdf-dropdown-item--logout:focus-visible {
    background: rgba(220, 38, 38, 0.06);
    color: #DC2626;
}

.qingdf-dropdown-item.qingdf-dropdown-item--logout .qingdf-dropdown-icon {
    background: rgba(220, 38, 38, 0.08);
    color: #DC2626;
}

.qingdf-dropdown-item.qingdf-dropdown-item--logout:hover .qingdf-dropdown-icon {
    background: rgba(220, 38, 38, 0.14);
    color: #DC2626;
}

/* ===== Mobile Responsive for Login/User ===== */
@media (max-width: 899px) {
    #qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn,
    nav#qingpdfNav .qingpdf-nav-login-btn,
    .qingpdf-nav-login-btn {
        padding: 8px 14px !important;
        font-size: 13px !important;
    }
    
    #qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-text,
    nav#qingpdfNav .qingpdf-nav-login-text,
    .qingpdf-nav-login-text {
        font-size: 13px !important;
    }
    
    .qingpdf-nav-username {
        max-width: 60px !important;
        font-size: 13px !important;
    }
}

@media (max-width: 480px) {
    #qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn,
    nav#qingpdfNav .qingpdf-nav-login-btn,
    .qingpdf-nav-login-btn {
        padding: 8px 12px !important;
        min-height: 38px !important;
    }
    
    #qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-text,
    nav#qingpdfNav .qingpdf-nav-login-text,
    .qingpdf-nav-login-text {
        font-size: 13px !important;
    }
    
    .qingpdf-nav-username {
        max-width: 50px !important;
        font-size: 12px !important;
    }
}

/* Dark mode support */
.dark #qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn,
.dark nav#qingpdfNav .qingpdf-nav-login-btn,
.dark .qingpdf-nav-login-btn {
    background: linear-gradient(135deg, #0F766E, #115E59) !important;
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.4) !important;
}

.dark #qingpdfNav .qingpdf-nav-actions .qingpdf-nav-login-btn:hover,
.dark nav#qingpdfNav .qingpdf-nav-login-btn:hover,
.dark .qingpdf-nav-login-btn:hover {
    background: linear-gradient(135deg, #115E59, #0F766E) !important;
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.5) !important;
}

.dark .qingpdf-user-dropdown {
    background: #1e293b;
    border-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.3);
}

.dark .qingpdf-dropdown-header {
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.18), rgba(14, 116, 144, 0.16));
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

.dark .qingdf-dropdown-avatar {
    border-color: #1e293b !important;
    box-shadow: 0 0 0 2px rgba(45, 212, 191, 0.45);
}

.dark .qingdf-dropdown-name {
    color: #F8FAFC;
}

.dark .qingdf-role-free {
    background: rgba(255, 255, 255, 0.08);
    color: #94A3B8;
}

.dark .qingdf-dropdown-id-copy {
    background: rgba(45, 212, 191, 0.14);
    color: #5EEAD4;
}

.dark .qingdf-dropdown-id-copy:hover {
    background: rgba(45, 212, 191, 0.24);
}

.dark .qingdf-dropdown-id-copy.is-copied {
    background: rgba(16, 185, 129, 0.3);
    color: #6EE7B7;
}

.dark .qingdf-dropdown-vipbtn {
    background: linear-gradient(135deg, #0D9488, #0E7490);
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.45);
}

.dark .qingdf-dropdown-divider {
    background: rgba(255, 255, 255, 0.07);
}

.dark .qingdf-dropdown-item {
    color: #cbd5e1;
}

.dark .qingdf-dropdown-item:hover,
.dark .qingdf-dropdown-item:focus-visible {
    background: rgba(45, 212, 191, 0.1);
    color: #5EEAD4;
}

.dark .qingdf-dropdown-icon {
    background: rgba(255, 255, 255, 0.07);
    color: #cbd5e1;
}

.dark .qingdf-dropdown-item:hover .qingdf-dropdown-icon,
.dark .qingdf-dropdown-item:focus-visible .qingdf-dropdown-icon {
    background: rgba(45, 212, 191, 0.18);
    color: #5EEAD4;
}

.dark .qingdf-dropdown-desc {
    color: #64748B;
}

.dark .qingdf-dropdown-item:hover .qingdf-dropdown-desc {
    color: #5EEAD4;
}

.dark .qingdf-dropdown-chevron {
    color: #475569;
}

.dark .qingpdf-nav-username {
    color: #cbd5e1;
}

.dark .qingpdf-nav-arrow {
    color: #64748B;
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
    .qingpdf-user-dropdown {
        transition: opacity 0.12s ease, visibility 0.12s;
        transform: none;
    }
    .qingpdf-user-dropdown.is-visible {
        transform: none;
    }
    .qingpdf-nav-user.is-open .qingpdf-nav-arrow {
        transform: none;
    }
    .qingpdf-dropdown-scrim {
        transition: opacity 0.12s ease, visibility 0.12s;
    }
    .qingpdf-dropdown-stagger {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .qingdf-dropdown-item,
    .qingdf-dropdown-vipbtn,
    .qingdf-dropdown-id-copy,
    .qingdf-dropdown-chevron,
    .qingpdf-nav-arrow {
        transition: none;
    }
    .qingdf-dropdown-id-copy.is-copied {
        animation: none;
    }
    .qingdf-dropdown-vipbtn:hover svg,
    .qingdf-dropdown-vipbtn svg {
        transform: none;
        transition: none;
    }
}

/* ── Navbar loading skeleton ──────────────────────────── */
@keyframes qingpdf-skeleton-pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

.qingpdf-nav-loading {
    display: flex !important;
    align-items: center;
    gap: 12px;
    padding: 8px 14px 8px 8px;
    flex-shrink: 0;
}

.qingpdf-nav-loading .qingpdf-skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #E2E8F0;
    animation: qingpdf-skeleton-pulse 1.5s ease-in-out infinite;
    flex-shrink: 0;
}

.qingpdf-nav-loading .qingpdf-skeleton-text {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.qingpdf-nav-loading .qingpdf-skeleton-line {
    height: 12px;
    border-radius: 6px;
    background: #E2E8F0;
    animation: qingpdf-skeleton-pulse 1.5s ease-in-out infinite;
}

.qingpdf-nav-loading .qingpdf-skeleton-line:first-child {
    width: 80px;
}

.qingpdf-nav-loading .qingpdf-skeleton-line:last-child {
    width: 50px;
}

@keyframes qingpdf-skeleton-pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}