:root {
    --indent-size: 20px;
}

body {
    font-family: var(--font-primary, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif);
    margin: 0;
    padding: 80px 16px 16px;
    color: var(--text-primary, #eaeaea);
    background: linear-gradient(135deg, var(--bg-primary, #0a0a0a) 0%, var(--bg-secondary, #1a1a2e) 50%, var(--bg-tertiary, #16213e) 100%);
}

.page-container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

header {
    padding-bottom: 1em;
    border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

h1 {
    margin: 0;
    font-family: var(--font-display, inherit);
}

p {
    color: var(--text-secondary, #b0b0b0);
}

#main-container {
    display: flex;
    height: calc(100vh - 180px);
    margin-top: 1em;
    gap: 1em;
    align-items: stretch;
}

.panel {
    flex: 1;
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(6px);
}

.panel-header {
    padding: 0.75em 1em;
    background: rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    font-weight: 600;
    color: var(--text-primary);
}

#svg-viewer {
    padding: 1.5em;
    flex-grow: 1;
    overflow: hidden;
    /* 由auto改为hidden，防止溢出滚动条 */
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: default;
    position: relative;
}

#svg-zoom-wrap {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) scale(1);
    will-change: transform;
    cursor: grab;
    transition: box-shadow 0.2s;
}

#svg-zoom-wrap.dragging {
    cursor: grabbing;
    box-shadow: 0 2px 24px 0 rgba(0, 212, 255, 0.11);
}

/* 伪类防止两栏高度不一致（补充flex) */
#svg-viewer svg * {
    cursor: pointer;
}

#svg-viewer svg {
    max-width: 100%;
    max-height: 100%;
}

#code-container {
    flex-grow: 1;
    overflow: auto;
    font-family: "SF Mono", "Fira Code", "Courier New", monospace;
    font-size: 14px;
    padding: 1em;
    white-space: nowrap;
    color: var(--text-primary);
}

.code-tree,
.code-tree ul {
    list-style: none;
    padding-left: var(--indent-size);
    margin: 0;
}

.code-tree>li {
    padding-left: 0;
}

.code-tree li {
    position: relative;
}

.code-line {
    padding: 2px 4px;
    border-radius: 4px;
    cursor: pointer;
}

.toggler {
    cursor: pointer;
    user-select: none;
    display: inline-block;
    width: 1em;
    text-align: center;
    color: var(--text-secondary);
}

.toggler::before {
    content: '▼';
    display: inline-block;
    transition: transform 0.1s linear;
}

.collapsed>.code-line>.toggler::before {
    transform: rotate(-90deg);
}

.collapsed>ul {
    display: none;
}

.collapsed+li {
    display: none;
}

.syntax-tag {
    color: #8bd3ff;
}

.syntax-attr-name {
    color: #ffd166;
}

.syntax-attr-value {
    color: #a0e7e5;
}

.syntax-bracket {
    color: #9aa0a6;
}

.highlight-svg-hover {
    outline: 2px solid #00d4ff;
    outline-offset: 2px;
}

.highlight-code-hover {
    background-color: rgba(0, 212, 255, 0.18);
}

.highlight-svg-pinned {
    outline: 3px solid #ff6b6b;
    outline-offset: 2px;
}

.highlight-code-pinned {
    background-color: rgba(255, 107, 107, 0.22);
    box-shadow: 0 0 0 2px rgba(255, 107, 107, 0.35);
}

/* 与 space.html 一致的玻璃拟态返回按钮样式 */
.glass-panel {
    background: rgba(10, 15, 30, 0.65);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
}
.back-button {
    position: fixed;
    top: 30px;
    left: 30px;
    padding: 12px 24px;
    border-radius: 30px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 300;
    letter-spacing: 1px;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 2000;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.3);
    text-transform: uppercase;
    font-size: 12px;
}
.back-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #ffffff;
    text-shadow: 0 0 10px #ffffff;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .back-button {
        top: 12px;
        left: 12px;
        padding: 8px 12px;
        font-size: 14px;
    }
}

@media (max-width: 992px) {
    #main-container {
        height: auto;
        min-height: calc(100vh - 180px);
        flex-direction: column;
    }
}