/**
 * OfferKuai 通知栏样式
 * 设计风格: 与网站主色调统一，现代简约
 * 配色方案: primary(主色蓝), success(成功绿), warning(警示橙), danger(紧急红), dark(深色模式)
 */

/* ============================================
   CSS 变量定义 - 5套配色方案
   ============================================ */
:root {
    /* 主色蓝 - 默认方案 */
    --nk-primary-bg: linear-gradient(135deg, #2563EB 0%, #4F46E5 100%);
    --nk-primary-shadow: rgba(37, 99, 235, 0.2);
    --nk-primary-hover-shadow: rgba(37, 99, 235, 0.3);
    
    /* 成功绿 */
    --nk-success-bg: linear-gradient(135deg, #059669 0%, #10B981 100%);
    --nk-success-shadow: rgba(5, 150, 105, 0.2);
    --nk-success-hover-shadow: rgba(5, 150, 105, 0.3);
    
    /* 警示橙 */
    --nk-warning-bg: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
    --nk-warning-shadow: rgba(217, 119, 6, 0.2);
    --nk-warning-hover-shadow: rgba(217, 119, 6, 0.3);
    
    /* 紧急红 */
    --nk-danger-bg: linear-gradient(135deg, #DC2626 0%, #EF4444 100%);
    --nk-danger-shadow: rgba(220, 38, 38, 0.2);
    --nk-danger-hover-shadow: rgba(220, 38, 38, 0.3);
    
    /* 深色模式 */
    --nk-dark-bg: linear-gradient(135deg, #1F2937 0%, #374151 100%);
    --nk-dark-shadow: rgba(31, 41, 55, 0.3);
    --nk-dark-hover-shadow: rgba(31, 41, 55, 0.4);
}

/* ============================================
   通知栏容器
   ============================================ */
#notification-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    font-family: 'Noto Serif SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ============================================
   通知栏包装器 - 基础样式
   ============================================ */
.nk-bar-wrapper {
    position: relative;
    padding: 8px 44px 8px 20px;
    box-shadow: 0 2px 12px var(--nk-primary-shadow);
    animation: nk-slideDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    transition: all 0.25s ease;
    min-height: 36px;
    display: flex;
    align-items: center;
}

.nk-bar-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
        rgba(255,255,255,0.08) 0%,
        rgba(255,255,255,0) 50%,
        rgba(255,255,255,0.04) 100%);
    pointer-events: none;
}

.nk-bar-wrapper:hover {
    box-shadow: 0 3px 16px var(--nk-primary-hover-shadow);
}

.nk-bar-wrapper:active {
    transform: translateY(0.5px);
}

/* ============================================
   配色方案 - Primary (主色蓝)
   ============================================ */
.nk-bar-wrapper.nk-theme-primary {
    background: var(--nk-primary-bg);
    box-shadow: 0 2px 12px var(--nk-primary-shadow);
}

.nk-bar-wrapper.nk-theme-primary:hover {
    box-shadow: 0 3px 16px var(--nk-primary-hover-shadow);
}

/* ============================================
   配色方案 - Success (成功绿)
   ============================================ */
.nk-bar-wrapper.nk-theme-success {
    background: var(--nk-success-bg);
    box-shadow: 0 2px 12px var(--nk-success-shadow);
}

.nk-bar-wrapper.nk-theme-success:hover {
    box-shadow: 0 3px 16px var(--nk-success-hover-shadow);
}

/* ============================================
   配色方案 - Warning (警示橙)
   ============================================ */
.nk-bar-wrapper.nk-theme-warning {
    background: var(--nk-warning-bg);
    box-shadow: 0 2px 12px var(--nk-warning-shadow);
}

.nk-bar-wrapper.nk-theme-warning:hover {
    box-shadow: 0 3px 16px var(--nk-warning-hover-shadow);
}

/* ============================================
   配色方案 - Danger (紧急红)
   ============================================ */
.nk-bar-wrapper.nk-theme-danger {
    background: var(--nk-danger-bg);
    box-shadow: 0 2px 12px var(--nk-danger-shadow);
}

.nk-bar-wrapper.nk-theme-danger:hover {
    box-shadow: 0 3px 16px var(--nk-danger-hover-shadow);
}

/* ============================================
   配色方案 - Dark (深色模式)
   ============================================ */
.nk-bar-wrapper.nk-theme-dark {
    background: var(--nk-dark-bg);
    box-shadow: 0 2px 12px var(--nk-dark-shadow);
}

.nk-bar-wrapper.nk-theme-dark:hover {
    box-shadow: 0 3px 16px var(--nk-dark-hover-shadow);
}

@keyframes nk-slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ============================================
   通知栏内部
   ============================================ */
.nk-bar-inner {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    position: relative;
}

/* ============================================
   关闭按钮
   ============================================ */
.nk-bar-close {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 26px;
    height: 26px;
    border: none;
    background: rgba(255, 255, 255, 0.12);
    color: white;
    font-size: 16px;
    line-height: 1;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    z-index: 10;
}

.nk-bar-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.05);
}

.nk-bar-close:active {
    transform: translateY(-50%) scale(0.95);
}

/* ============================================
   通知内容
   ============================================ */
.nk-bar-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    text-align: center;
}

/* ============================================
   图标
   ============================================ */
.nk-bar-icon {
    font-size: 1rem;
    flex-shrink: 0;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}

/* ============================================
   标题文字
   ============================================ */
.nk-bar-text {
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    line-height: 1.4;
    text-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

/* ============================================
   描述文字
   ============================================ */
.nk-bar-desc {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.8rem;
    padding-left: 10px;
    border-left: 1px solid rgba(255, 255, 255, 0.25);
    line-height: 1.4;
}

/* ============================================
   链接按钮
   ============================================ */
.nk-bar-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: white;
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    padding: 3px 12px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 100px;
    margin-left: 6px;
    transition: all 0.2s ease;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    pointer-events: none;
    white-space: nowrap;
}

.nk-bar-wrapper:hover .nk-bar-link {
    background: rgba(255, 255, 255, 0.22);
    transform: translateX(2px);
}

.nk-bar-link::after {
    content: '→';
    font-size: 0.75rem;
    transition: transform 0.2s ease;
}

.nk-bar-wrapper:hover .nk-bar-link::after {
    transform: translateX(2px);
}

/* ============================================
   轮播容器
   ============================================ */
.nk-bar-carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
}

/* ============================================
   轮播项
   ============================================ */
.nk-bar-slide {
    display: none;
    animation: nk-fadeIn 0.35s ease;
}

.nk-bar-slide.active {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

@keyframes nk-fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   轮播控制
   ============================================ */
.nk-bar-controls {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 12px;
    flex-shrink: 0;
}

.nk-bar-btn {
    width: 22px;
    height: 22px;
    border: none;
    background: rgba(255, 255, 255, 0.12);
    color: white;
    font-size: 12px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.nk-bar-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.nk-bar-indicator {
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.7rem;
    min-width: 28px;
    text-align: center;
}

.nk-bar-indicator span {
    font-weight: 600;
}

/* ============================================
   点击提示
   ============================================ */
.nk-bar-hint {
    position: absolute;
    right: 44px;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.7rem;
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

.nk-bar-wrapper:hover .nk-bar-hint {
    opacity: 1;
}

/* ============================================
   身体有通知栏时的偏移 - 降低后的高度
   ============================================ */
body.nk-body-has-bar {
    padding-top: 44px;
}

body.nk-body-has-bar .top-nav {
    top: 44px;
}

body.nk-body-has-bar #hero {
    padding-top: calc(8rem + 44px);
}

body.nk-body-has-bar .toc-nav {
    top: calc(50% + 22px);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
    .nk-bar-wrapper {
        padding: 7px 40px 7px 14px;
        min-height: 32px;
    }

    .nk-bar-inner {
        gap: 8px;
    }

    /* 修复问题 1.1: 移动端通知内容保持单行显示，不换行 */
    .nk-bar-content,
    .nk-bar-slide.active {
        flex-direction: row;
        flex-wrap: nowrap;
        gap: 6px;
        justify-content: center;
    }

    .nk-bar-text {
        font-size: 0.82rem;
        white-space: nowrap;
    }

    .nk-bar-desc {
        display: none;
    }

    .nk-bar-link {
        margin-left: 0;
        margin-top: 0;
        padding: 2px 10px;
        font-size: 0.75rem;
    }

    .nk-bar-controls {
        margin-left: 6px;
    }

    .nk-bar-indicator {
        display: none;
    }

    .nk-bar-hint {
        display: none;
    }

    .nk-bar-close {
        width: 24px;
        height: 24px;
        font-size: 14px;
    }

    /* 修复问题 1.2: 调整通知栏与导航栏间距，使二者紧贴 */
    body.nk-body-has-bar {
        padding-top: 36px;
    }

    body.nk-body-has-bar .top-nav {
        top: 36px;
    }

    body.nk-body-has-bar #hero {
        padding-top: calc(6rem + 36px);
    }

    /* 修复问题 1.3: 移动端菜单打开时，通知栏不遮挡菜单 */
    body.menu-open.nk-body-has-bar .nk-bar-wrapper {
        z-index: 999;
    }

    body.menu-open.nk-body-has-bar #notification-bar {
        z-index: 999;
    }
}

@media (max-width: 480px) {
    .nk-bar-wrapper {
        padding: 6px 36px 6px 12px;
        min-height: 30px;
    }

    .nk-bar-text {
        font-size: 0.8rem;
    }

    .nk-bar-icon {
        font-size: 0.9rem;
    }

    .nk-bar-close {
        width: 22px;
        height: 22px;
        font-size: 13px;
    }

    /* 修复问题 1.2: 小屏幕进一步缩小间距 */
    body.nk-body-has-bar {
        padding-top: 34px;
    }

    body.nk-body-has-bar .top-nav {
        top: 34px;
    }

    body.nk-body-has-bar #hero {
        padding-top: calc(5rem + 34px);
    }
}