/* 生之科学学科门户 · 前台样式
 * 级别色由设置生成为 --sg-<tier> 变量（见 Front::enqueue_assets）；这里给出默认值与暗色模式。
 * 版式：左边框色条块；正文宋体系，标题黑体系。不加载任何外部字体。 */

:root {
	--sg-foundation: #7A1F2B;
	--sg-theorem: #1F3A5F;
	--sg-empirical: #1F5C6B;
	--sg-structural: #2E7D4F;
	--sg-interpretive: #B7791F;
	--sg-lexical: #6A4C93;
	--sg-engineering: #5A6470;
	--sg-programmatic: #4A5A7A;
	--sg-rejected: #B03A2E;

	--sg-text: #1d2127;
	--sg-muted: #5b6470;
	--sg-surface: #ffffff;
	--sg-surface-2: #f6f5f1;
	--sg-line: #d9d6cc;
	--sg-warn-bg: #fff4d6;
	--sg-warn-fg: #6b4a00;

	--sg-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", "Noto Serif", Georgia, serif;
	--sg-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
	:root {
		--sg-text: #e7e5df;
		--sg-muted: #a9adb4;
		--sg-surface: #17191d;
		--sg-surface-2: #202329;
		--sg-line: #3a3e46;
		--sg-warn-bg: #3a2f10;
		--sg-warn-fg: #f3d58a;
	}
}

.sg-main { box-sizing: border-box; max-width: 60rem; margin: 0 auto; padding: 1.5rem 1rem 3rem; font-family: var(--sg-serif); color: var(--sg-text); line-height: 1.75; }
.sg-block { font-family: var(--sg-serif); color: var(--sg-text); }
.sg-main h1, .sg-main h2, .sg-main h3, .sg-main h4, .sg-nav, .sg-tier, .sg-badge, .sg-label, .sg-id, .sg-filter, .sg-doors { font-family: var(--sg-sans); }
.sg-main [lang="en"] { font-family: Georgia, "Times New Roman", var(--sg-serif); }

.sg-nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1rem; border-bottom: 1px solid var(--sg-line); padding-bottom: .5rem; margin-bottom: 1.25rem; font-size: .92rem; }
.sg-nav ul { display: flex; flex-wrap: wrap; gap: .25rem 1rem; list-style: none; margin: 0; padding: 0; }
.sg-nav a { color: inherit; text-decoration: none; }
.sg-nav a[aria-current="page"] { font-weight: 700; border-bottom: 2px solid currentColor; }
.sg-lang-switch { border: 1px solid var(--sg-line); border-radius: 3px; padding: .1rem .6rem; }

.sg-h1 { font-size: 1.7rem; margin: .5rem 0 1rem; line-height: 1.35; }
.sg-section { margin: 2rem 0 0; }
.sg-section h2 { font-size: 1.2rem; border-bottom: 1px solid var(--sg-line); padding-bottom: .25rem; }
.sg-tagline { font-size: 1.15rem; margin: 0 0 1.5rem; }
.sg-intro, .sg-note { color: var(--sg-muted); }
.sg-empty { color: var(--sg-muted); font-style: italic; }
.sg-count { color: var(--sg-muted); font-size: .85em; }

/* 三扇入口 */
.sg-doors { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: .75rem; }
.sg-door { display: block; padding: 1rem; background: var(--sg-surface-2); border-left: 4px solid var(--sg-theorem); color: inherit; text-decoration: none; }
.sg-door strong { display: block; font-size: 1.1rem; }
.sg-door span { color: var(--sg-muted); font-size: .92rem; }
.sg-twonav { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 0 2rem; }
.sg-navlist { list-style: none; padding: 0; }

/* 级别徽标与卡片（左边框色条） */
.sg-tier { display: inline-block; font-size: .8rem; line-height: 1.4; padding: .05rem .5rem; border-radius: 2px; color: #fff; background: var(--sg-theorem); white-space: nowrap; vertical-align: .1em; }
.sg-tier--foundation { background: var(--sg-foundation); }
.sg-tier--theorem { background: var(--sg-theorem); }
.sg-tier--empirical { background: var(--sg-empirical); }
.sg-tier--structural { background: var(--sg-structural); }
.sg-tier--interpretive { background: var(--sg-interpretive); }
.sg-tier--lexical { background: var(--sg-lexical); }
.sg-tier--engineering { background: var(--sg-engineering); }
.sg-tier--programmatic { background: var(--sg-programmatic); }
.sg-tier--rejected { background: var(--sg-rejected); }

.sg-card { --sg-bar: var(--sg-theorem); border-left: 5px solid var(--sg-bar); background: var(--sg-surface); padding: .75rem 1rem; margin: 0 0 1rem; box-shadow: 0 0 0 1px var(--sg-line) inset; }
.sg-card--foundation { --sg-bar: var(--sg-foundation); }
.sg-card--theorem { --sg-bar: var(--sg-theorem); }
.sg-card--empirical { --sg-bar: var(--sg-empirical); }
.sg-card--structural { --sg-bar: var(--sg-structural); }
.sg-card--interpretive { --sg-bar: var(--sg-interpretive); }
.sg-card--lexical { --sg-bar: var(--sg-lexical); }
.sg-card--engineering { --sg-bar: var(--sg-engineering); }
.sg-card--programmatic { --sg-bar: var(--sg-programmatic); }
.sg-card--rejected { --sg-bar: var(--sg-rejected); }
.sg-card--compact { padding: .5rem .85rem; margin-bottom: .6rem; }
.sg-card__head { display: flex; flex-wrap: wrap; align-items: center; gap: .35rem; }
.sg-id { font-weight: 700; color: inherit; text-decoration: none; letter-spacing: .02em; }
.sg-statement { margin: .35rem 0; font-size: 1.05rem; }
.sg-card--compact .sg-statement { font-size: 1rem; margin: .2rem 0 0; }
.sg-field { margin: .3rem 0; font-size: .95rem; }
.sg-label { display: inline-block; min-width: 4.5em; color: var(--sg-muted); font-size: .85rem; }
.sg-badge { font-size: .75rem; border: 1px solid var(--sg-line); border-radius: 2px; padding: 0 .4rem; color: var(--sg-muted); }
.sg-badge--machine_verified { border-color: var(--sg-structural); color: var(--sg-structural); }
.sg-status { font-size: .75rem; padding: 0 .4rem; border: 1px dashed var(--sg-rejected); color: var(--sg-rejected); }
.sg-foundations { margin-top: .35rem; font-size: .85rem; color: var(--sg-foundation); }
.sg-kind { font-family: var(--sg-sans); font-size: .75rem; color: var(--sg-muted); text-transform: uppercase; letter-spacing: .04em; }

.sg-review-banner, .sg-preview-banner { background: var(--sg-warn-bg); color: var(--sg-warn-fg); padding: .35rem .75rem; margin: -.25rem -.5rem .5rem; font-family: var(--sg-sans); font-size: .9rem; }
.sg-fallback { opacity: .92; }
.sg-pending { font-family: var(--sg-sans); font-size: .72rem; color: var(--sg-warn-fg); background: var(--sg-warn-bg); padding: 0 .35rem; border-radius: 2px; white-space: nowrap; }

/* 九级说明 */
.sg-legend dl { margin: 0; }
.sg-legend__row { border-left: 5px solid var(--sg-bar, var(--sg-theorem)); padding: .4rem .8rem; margin-bottom: .5rem; background: var(--sg-surface-2); }
.sg-legend dt { font-weight: 700; }
.sg-legend dd { margin: .2rem 0 0; }

/* 图、更正、日志 */
.sg-graph__layer h4 { margin: 1rem 0 .3rem; font-size: .95rem; color: var(--sg-muted); }
.sg-graph ul, .sg-plain { list-style: none; padding-left: 0; }
.sg-graph li, .sg-plain li { margin: .3rem 0; }
.sg-edge-types { font-family: var(--sg-sans); font-size: .75rem; color: var(--sg-muted); }
.sg-correction { border-left: 5px solid var(--sg-rejected); padding: .5rem .9rem; margin-bottom: 1rem; background: var(--sg-surface-2); }
.sg-correction header { font-family: var(--sg-sans); display: flex; gap: .75rem; }
.sg-correction p { margin: .25rem 0; }
.sg-deprecated del { color: var(--sg-muted); }
.sg-changelog { width: 100%; border-collapse: collapse; font-size: .9rem; }
.sg-changelog th, .sg-changelog td { border-bottom: 1px solid var(--sg-line); padding: .35rem .5rem; text-align: left; vertical-align: top; }
.sg-dl { display: grid; grid-template-columns: max-content 1fr; gap: .25rem 1rem; }
.sg-dl dt { color: var(--sg-muted); font-family: var(--sg-sans); font-size: .9rem; }
.sg-dl dd { margin: 0; }
.sg-tree { list-style: none; padding-left: 1.1rem; border-left: 1px solid var(--sg-line); }
.sg-definition { font-size: 1.1rem; }

/* 引用 */
.sg-cite { margin-top: 2rem; }
.sg-cite__item { margin-bottom: .75rem; }
.sg-cite__label { font-family: var(--sg-sans); font-size: .85rem; color: var(--sg-muted); display: flex; justify-content: space-between; align-items: center; }
.sg-cite pre { white-space: pre-wrap; word-break: break-word; background: var(--sg-surface-2); padding: .6rem .8rem; margin: .25rem 0 0; font-size: .85rem; }
.sg-copy { font: inherit; font-size: .8rem; cursor: pointer; background: transparent; border: 1px solid var(--sg-line); color: inherit; padding: .05rem .6rem; border-radius: 2px; }

/* 检索表单 */
.sg-filter { display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: center; margin-bottom: 1rem; }
.sg-filter input, .sg-filter select, .sg-filter button { font: inherit; padding: .2rem .4rem; }