/**
 * notes-toc.css — 文章目录通用样式
 * 由 notes-toc.js 生成的 DOM 结构驱动
 * 适用于 note-viewer.html 和 gallery.html
 */

/* ========================
   TOC 切换按钮
   ======================== */
.toc-toggle-btn {
    position: fixed;
    bottom: 30px;
    right: 100px;
    width: 45px;
    height: 45px;
    background: var(--surface-elevated);
    border: 2.5px solid var(--border);
    border-radius: 50%;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.toc-toggle-btn:hover {
    background: var(--primary);
    color: #ffffff;
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(0, 217, 255, 0.4);
}

.toc-toggle-btn[hidden] {
    display: none !important;
}

/* ========================
   TOC 容器 — 毛玻璃侧边栏
   ======================== */
.note-toc {
    position: fixed !important;
    top: 50% !important;
    right: 1.15rem !important;
    transform: translateY(-50%) translateZ(0);
    width: min(18.25rem, calc(100vw - 2rem)) !important;
    max-height: min(68vh, 40rem) !important;
    padding: 0 !important;
    border: 1px solid color-mix(in srgb, var(--glass-border) 78%, transparent);
    border-radius: 1rem;
    background:
        linear-gradient(180deg,
            color-mix(in srgb, var(--surface-elevated) 76%, transparent),
            color-mix(in srgb, var(--surface) 64%, transparent));
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.2) !important;
    overflow: hidden;
    backdrop-filter: blur(22px) saturate(135%);
    -webkit-backdrop-filter: blur(22px) saturate(135%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
    display: none;
    flex-direction: column;
    z-index: 1050;
}

.note-toc--ready,
.note-toc--empty {
    display: flex !important;
}

.note-toc.note-toc--hidden {
    transform: translateY(-50%) translateX(150%) !important;
    opacity: 0;
    pointer-events: none;
}

/* ========================
   TOC 滚动区域
   ======================== */
.note-toc__nav {
    max-height: min(68vh, 40rem) !important;
    padding: 0.72rem;
    overflow-y: auto !important;
    overflow-x: hidden;
    overscroll-behavior: contain;
}

/* ========================
   TOC 标题栏 — sticky 顶部
   ======================== */
.note-toc__title {
    position: sticky;
    top: -0.72rem;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 0.48rem;
    margin: -0.72rem -0.72rem 0.58rem;
    padding: 0.78rem 0.82rem 0.64rem;
    border-bottom: 1px solid color-mix(in srgb, var(--glass-border) 62%, transparent);
    color: var(--text);
    background: color-mix(in srgb, var(--surface-elevated) 72%, transparent);
    font-size: 0.86rem;
    font-weight: 800;
    line-height: 1;
    backdrop-filter: blur(16px) saturate(130%);
    -webkit-backdrop-filter: blur(16px) saturate(130%);
}

.note-toc__title .toc-accent {
    width: 0.34rem;
    height: 1.05rem;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    box-shadow: 0 0 10px color-mix(in srgb, var(--primary) 42%, transparent);
    flex-shrink: 0;
}

.note-toc__count {
    margin-left: auto;
    min-width: 1.25rem;
    padding: 0.12rem 0.38rem;
    border: 1px solid color-mix(in srgb, var(--primary) 16%, var(--glass-border));
    border-radius: var(--radius-full);
    color: var(--primary);
    background: color-mix(in srgb, var(--primary) 7%, transparent);
    font-size: 0.64rem;
    font-weight: 800;
    text-align: center;
    flex-shrink: 0;
}

/* ========================
   TOC 列表树
   ======================== */
.note-toc__list {
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}

.note-toc__list--children {
    margin-left: 0;
    padding-left: 1.08rem;
    border-left: 1px solid color-mix(in srgb, var(--glass-border) 72%, transparent);
    overflow: hidden;
}

.note-toc__item {
    margin: 0.05rem 0;
}

.note-toc__item.is-collapsed > .note-toc__list--children {
    display: none;
}

.note-toc__row {
    display: flex;
    align-items: center;
    gap: 0.22rem;
}

/* 折叠/展开按钮 */
.note-toc__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 1.32rem;
    width: 1.32rem;
    height: 1.32rem;
    padding: 0;
    box-sizing: border-box;
    appearance: none;
    -webkit-appearance: none;
    border: 1px solid transparent;
    border-radius: 0.42rem;
    color: var(--text-disabled);
    background: transparent;
    line-height: 1;
    cursor: pointer;
    transition: color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.note-toc__spacer {
    flex: 0 0 1.32rem;
    width: 1.32rem;
    height: 1.32rem;
}

.note-toc__toggle:disabled {
    cursor: default;
    opacity: 0;
    pointer-events: none;
}

.note-toc__toggle:not(:disabled):hover {
    color: var(--primary);
    background: color-mix(in srgb, var(--primary) 9%, transparent);
}

.note-toc__toggle i {
    font-size: 0.62rem;
    transition: transform 0.18s ease;
}

.note-toc__item.is-expanded > .note-toc__row .note-toc__toggle i {
    transform: rotate(90deg);
}

/* ========================
   TOC 链接
   ======================== */
.note-toc__link {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    padding: 0.42rem 0.58rem;
    border: 1px solid transparent;
    border-radius: 0.68rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    line-height: 1.35;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: normal;
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

/* 左侧 2px 色条指示器 */
.note-toc__link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 2px;
    height: 0.9rem;
    border-radius: var(--radius-full);
    background: var(--primary);
    opacity: 0;
    transform: translateY(-50%) scaleY(0.55);
    transition: opacity 0.18s ease, transform 0.18s ease;
}

.note-toc__link:hover {
    color: var(--text);
    background: color-mix(in srgb, var(--surface-elevated) 58%, transparent);
    border-color: color-mix(in srgb, var(--glass-border) 62%, transparent);
    transform: translateX(2px);
}

.note-toc__link.is-active {
    color: var(--primary);
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--primary) 12%, transparent), transparent 72%);
    border-color: color-mix(in srgb, var(--primary) 18%, transparent);
    font-weight: 760;
}

.note-toc__link.is-active::before {
    opacity: 1;
    transform: translateY(-50%) scaleY(1);
}

/* 父级路径高亮 */
.note-toc__item.is-active-path > .note-toc__row .note-toc__link {
    color: color-mix(in srgb, var(--primary) 78%, var(--text));
}

/* 层级缩进样式 */
.note-toc__link[data-level="1"],
.note-toc__link[data-level="2"] {
    font-weight: 760;
}

.note-toc__link[data-level="3"] {
    font-size: 0.76rem;
}

.note-toc__link[data-level="4"] {
    font-size: 0.73rem;
    color: color-mix(in srgb, var(--text-muted) 78%, transparent);
}

/* ========================
   空状态
   ======================== */
.note-toc__empty {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.68rem;
    border: 1px dashed color-mix(in srgb, var(--glass-border) 72%, transparent);
    border-radius: 0.78rem;
    color: var(--text-muted);
    background: color-mix(in srgb, var(--surface) 42%, transparent);
    font-size: 0.8rem;
}

.note-toc__empty-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.4rem;
    height: 1.4rem;
    border-radius: 50%;
    color: var(--primary);
    background: color-mix(in srgb, var(--primary) 9%, transparent);
    font-weight: 900;
    flex-shrink: 0;
}

/* ========================
   标题锚点偏移（避免被 navbar 遮挡）
   ======================== */
.note-content h2,
.note-content h3,
.note-content h4 {
    scroll-margin-top: calc(4.5rem + 1rem);
}

/* ========================
   阅读进度条
   ======================== */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--gradient-primary);
    width: 0%;
    z-index: 99999;
    transition: width 0.1s ease-out;
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
}

/* ========================
   响应式
   ======================== */
@media (max-width: 768px) {
    .toc-toggle-btn {
        bottom: 100px;
        right: 30px;
    }

    .note-toc {
        top: 50% !important;
        right: 0.75rem !important;
        width: min(21rem, calc(100vw - 1.5rem)) !important;
        max-height: min(72vh, calc(100dvh - 8rem)) !important;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5) !important;
    }

    .note-toc__nav {
        max-height: min(72vh, calc(100dvh - 8rem)) !important;
    }
}

/* ========================
   浅色主题
   ======================== */
body[data-theme='light'] .note-toc {
    background: color-mix(in srgb, #ffffff 84%, transparent);
    border-color: rgba(15, 23, 42, 0.1);
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.1) !important;
}

body[data-theme='light'] .note-toc__title {
    background: color-mix(in srgb, #ffffff 82%, transparent);
}

body[data-theme='light'] .note-toc__link::before {
    background: #ffffff;
}

body[data-theme='light'] .note-toc__link:hover {
    background: rgba(37, 99, 235, 0.045);
}

body[data-theme='light'] .note-toc__link.is-active {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), transparent 72%);
}