@charset "UTF-8";
/* ==========================================================================
   FD3API — 首页
   设计语言：印刷手册 / 工程仪表
   规则：直边、实线、实色、等宽数字、零阴影、零模糊、零渐变文字
   ========================================================================== */

:root {
	--paper: #f7f5f0;
	--paper-2: #fffdf8;
	--paper-3: #efebe2;
	--ink: #1b1a17;
	--ink-2: #56534b;
	--ink-3: #8d8880;
	--rule: #d9d4c7;
	--rule-2: #e7e3d9;
	--accent: #c4452b;
	--accent-2: #9d3220;
	--accent-soft: rgba(196, 69, 43, 0.075);

	--ring-1: #9d3220;
	--ring-2: #c4452b;
	--ring-3: #d9704f;
	--ring-4: #e09b81;
	--ring-5: #ecc4b3;
	--ring-6: #f3ddd4;

	--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
	--mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Roboto Mono", monospace;

	--shell: 1140px;
	--gut: 26px;
	--nav-h: 64px;

	--ease: cubic-bezier(0.22, 1, 0.36, 1);
	--ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
	--tr-color: background-color 0.45s var(--ease-soft), color 0.45s var(--ease-soft), border-color 0.45s var(--ease-soft);
}

:root[data-theme="dark"] {
	--paper: #131312;
	--paper-2: #1a1a18;
	--paper-3: #1f1f1c;
	--ink: #f1efe9;
	--ink-2: #a9a49a;
	--ink-3: #7b766c;
	--rule: #302f2a;
	--rule-2: #262521;
	--accent: #ef6a45;
	--accent-2: #f68d6d;
	--accent-soft: rgba(239, 106, 69, 0.09);

	--ring-1: #f68d6d;
	--ring-2: #ef6a45;
	--ring-3: #cd5430;
	--ring-4: #a44220;
	--ring-5: #7b3518;
	--ring-6: #592710;
}

/* ---------- 基础 ---------- */

* { box-sizing: border-box; }

html {
	-webkit-text-size-adjust: 100%;
	scroll-behavior: smooth;
}

body {
	margin: 0;
	padding-top: var(--nav-h);
	background-color: var(--paper);
	color: var(--ink);
	font-family: var(--sans);
	font-size: 16px;
	line-height: 1.65;
	overflow-x: hidden;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	transition: var(--tr-color);
}

p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
canvas, svg { display: block; }

::selection { background: var(--accent); color: var(--paper); }

.shell {
	width: min(100% - var(--gut) * 2, var(--shell));
	margin-inline: auto;
}

.noscript {
	padding: 56px var(--gut);
	font-size: 16px;
	color: var(--ink-2);
}

/* ---------- 排版基元 ---------- */

.eyebrow {
	display: flex;
	align-items: center;
	gap: 12px;
	margin: 0 0 22px;
	font-family: var(--mono);
	font-size: 11px;
	font-weight: 500;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.eyebrow::before {
	content: "";
	flex: 0 0 24px;
	height: 1px;
	background: var(--accent);
	transition: var(--tr-color);
}

.eyebrow b {
	font-weight: 500;
	color: var(--accent);
	letter-spacing: 0.1em;
}

.h2 {
	margin: 0 0 18px;
	font-size: clamp(24px, 3.3vw, 36px);
	font-weight: 600;
	line-height: 1.2;
	letter-spacing: -0.022em;
	transition: var(--tr-color);
}

/* 等宽数字按用途分别声明：.r（右对齐数值）、.side-v / .ring-v / .mbar .pct */

/* ---------- 顶部阅读进度 ---------- */

.progress {
	position: fixed;
	inset: 0 0 auto 0;
	height: 2px;
	z-index: 200;
	pointer-events: none;
}

.progress i {
	display: block;
	height: 100%;
	background: var(--accent);
	transform: scaleX(0);
	transform-origin: 0 50%;
	transition: background-color 0.45s var(--ease-soft);
}

/* ---------- 顶栏 ---------- */

.topbar {
	position: fixed;
	inset: 0 0 auto 0;
	z-index: 190;
	height: var(--nav-h);
	background-color: var(--paper);
	border-bottom: 1px solid var(--rule);
	transition: var(--tr-color);
}

.topbar-in {
	display: flex;
	align-items: center;
	height: 100%;
	gap: 18px;
}

.brand {
	display: flex;
	align-items: center;
	gap: 11px;
	flex: 0 0 auto;
}

.brand-mark {
	display: grid;
	place-items: center;
	width: 32px;
	height: 32px;
	background-color: var(--ink);
	color: var(--paper);
	font-family: var(--mono);
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.03em;
	transition: var(--tr-color);
}

.brand-name {
	font-size: 16px;
	font-weight: 600;
	letter-spacing: -0.01em;
	transition: var(--tr-color);
}

.brand-tag {
	font-family: var(--mono);
	font-size: 10px;
	letter-spacing: 0.18em;
	color: var(--ink-3);
	padding-left: 11px;
	border-left: 1px solid var(--rule);
	transition: var(--tr-color);
}

.nav {
	display: flex;
	align-items: center;
	gap: 26px;
	margin-left: auto;
}

.nav a {
	position: relative;
	font-size: 14px;
	color: var(--ink-2);
	padding: 4px 0;
	transition: var(--tr-color);
}

.nav a::after {
	content: "";
	position: absolute;
	left: 0;
	bottom: 0;
	width: 100%;
	height: 1px;
	background: var(--accent);
	transform: scaleX(0);
	transform-origin: 0 50%;
	transition: transform 0.5s var(--ease), background-color 0.45s var(--ease-soft);
}

.nav a:hover { color: var(--ink); }
.nav a:hover::after { transform: scaleX(1); }

.tools {
	display: flex;
	align-items: center;
	gap: 10px;
	margin-left: 8px;
}

.tbtn {
	display: flex;
	align-items: center;
	gap: 7px;
	height: 32px;
	padding: 0 11px;
	border: 1px solid var(--rule);
	font-family: var(--mono);
	font-size: 10.5px;
	letter-spacing: 0.14em;
	color: var(--ink-2);
	transition: var(--tr-color), transform 0.5s var(--ease);
}

.tbtn:hover {
	color: var(--ink);
	border-color: var(--ink-3);
}

.tbtn:active { transform: scale(0.965); }

.tbtn i {
	width: 6px;
	height: 6px;
	border-radius: 50%;
	background: var(--accent);
	transition: var(--tr-color);
}

.burger {
	display: none;
	width: 32px;
	height: 32px;
	border: 1px solid var(--rule);
	place-items: center;
	transition: var(--tr-color);
}

.burger span {
	display: block;
	width: 15px;
	height: 1px;
	background: var(--ink-2);
	transition: transform 0.5s var(--ease), background-color 0.45s var(--ease-soft);
}

.burger span + span { margin-top: 4px; }
.burger[aria-expanded="true"] span:first-child { transform: translateY(2.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:last-child { transform: translateY(-2.5px) rotate(-45deg); }

/* ---------- 首屏 ---------- */

.hero {
	padding: clamp(64px, 11vh, 132px) 0 clamp(56px, 9vh, 104px);
	border-bottom: 1px solid var(--rule);
	transition: var(--tr-color);
}

.hero-grid {
	display: grid;
	grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.78fr);
	gap: clamp(38px, 6vw, 92px);
	align-items: start;
}

.hero-lead { min-width: 0; }

.display {
	margin: 0 0 26px;
	font-size: clamp(37px, 7vw, 72px);
	font-weight: 600;
	line-height: 1.04;
	letter-spacing: -0.035em;
	transition: var(--tr-color);
}

.display .mask {
	display: block;
	overflow: hidden;
	padding-bottom: 0.06em;
	margin-bottom: -0.06em;
}

.display .mask > span {
	display: block;
	transform: translateY(102%);
	opacity: 0;
}

body.ready .display .mask > span {
	transform: none;
	opacity: 1;
	transition: transform 1.05s var(--ease), opacity 0.85s var(--ease);
	transition-delay: var(--d, 0ms);
}

.lede {
	max-width: 44ch;
	font-size: clamp(15px, 1.45vw, 17px);
	line-height: 1.72;
	color: var(--ink-2);
	transition: var(--tr-color);
}

.cta {
	display: flex;
	flex-wrap: wrap;
	gap: 14px;
	margin-top: 34px;
}

.btn {
	display: inline-flex;
	align-items: center;
	gap: 12px;
	height: 46px;
	padding: 0 20px;
	font-size: 14.5px;
	font-weight: 500;
	border: 1px solid transparent;
	transition: var(--tr-color), transform 0.5s var(--ease);
}

.btn .arw {
	position: relative;
	width: 14px;
	height: 1px;
	background: currentColor;
	transition: transform 0.5s var(--ease), background-color 0.45s var(--ease-soft);
}

.btn .arw::after {
	content: "";
	position: absolute;
	right: 0;
	top: -2.5px;
	width: 6px;
	height: 6px;
	border-top: 1px solid currentColor;
	border-right: 1px solid currentColor;
	transform: rotate(45deg);
}

.btn:hover .arw { transform: translateX(5px); }

.btn-solid {
	background-color: var(--accent);
	color: #fff;
	border-color: var(--accent);
}

.btn-solid:hover { background-color: var(--accent-2); border-color: var(--accent-2); }

.btn-line {
	border-color: var(--rule);
	color: var(--ink);
}

.btn-line:hover { border-color: var(--ink); }
.btn:active { transform: scale(0.985); }

/* 规格行 */

.specs {
	display: flex;
	flex-wrap: wrap;
	gap: 8px 26px;
	margin-top: clamp(40px, 7vh, 72px);
	padding-top: 18px;
	border-top: 1px solid var(--rule-2);
	font-family: var(--mono);
	font-size: 10.5px;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.specs span { white-space: nowrap; }
.specs em { font-style: normal; color: var(--ink-2); }

/* 首屏侧栏 */

.hero-side {
	position: sticky;
	top: calc(var(--nav-h) + 26px);
	min-width: 0;
	opacity: 0;
	transform: translateY(16px);
}

body.ready .hero-side {
	opacity: 1;
	transform: none;
	transition: opacity 0.9s var(--ease) 0.32s, transform 0.9s var(--ease) 0.32s;
}

.side-panel {
	border: 1px solid var(--rule);
	background-color: var(--paper-2);
	padding: 22px 20px 4px;
	transition: var(--tr-color);
}

.side-k {
	font-family: var(--mono);
	font-size: 10.5px;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.side-v {
	margin-top: 14px;
	font-family: var(--mono);
	font-size: clamp(30px, 3.9vw, 42px);
	font-weight: 500;
	line-height: 1;
	letter-spacing: -0.03em;
	font-variant-numeric: tabular-nums;
	transition: var(--tr-color);
}

.side-u {
	margin-top: 9px;
	font-family: var(--mono);
	font-size: 11px;
	letter-spacing: 0.1em;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.side-list { margin: 20px 0 0; }

.side-list > div {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	padding: 11px 0;
	border-top: 1px solid var(--rule-2);
	transition: var(--tr-color);
}

.side-list dt {
	font-size: 13px;
	color: var(--ink-2);
	transition: var(--tr-color);
}

.side-list dd {
	margin: 0;
	font-family: var(--mono);
	font-size: 14px;
	font-variant-numeric: tabular-nums;
	transition: var(--tr-color);
}

/* ---------- 区块通用 ---------- */

.section {
	padding: clamp(58px, 9vh, 104px) 0;
	border-bottom: 1px solid var(--rule);
	transition: var(--tr-color);
}

.sec-head { margin-bottom: clamp(32px, 5vh, 54px); }
.sec-head .h2 { margin-bottom: 0; }

/* 入场 */

.rise {
	opacity: 0;
	transform: translateY(15px);
}

.is-in .rise,
.is-in.rise {
	opacity: 1;
	transform: none;
	transition: opacity 0.85s var(--ease), transform 0.85s var(--ease);
	transition-delay: var(--d, 0ms);
}

/* ---------- 实时用量 ---------- */

.meters {
	display: grid;
	grid-template-columns: minmax(0, 290px) minmax(0, 1fr);
	gap: clamp(34px, 5.5vw, 80px);
	align-items: center;
}

.ring-wrap {
	position: relative;
	width: 100%;
	max-width: 290px;
	margin-inline: auto;
}

.ring { width: 100%; height: auto; }
.ring circle { fill: none; stroke-width: 13; }
.ring .ring-track {
	stroke: var(--rule-2);
	transition: stroke 0.45s var(--ease-soft);
}

.ring .ring-seg {
	stroke-linecap: butt;
	transition: stroke 0.45s var(--ease-soft);
}

.ring-center {
	position: absolute;
	inset: 0;
	display: grid;
	align-content: center;
	justify-items: center;
	text-align: center;
	pointer-events: none;
}

.ring-v {
	font-family: var(--mono);
	font-size: clamp(26px, 3.4vw, 34px);
	font-weight: 500;
	line-height: 1;
	letter-spacing: -0.03em;
	font-variant-numeric: tabular-nums;
	transition: var(--tr-color);
}

.ring-u {
	margin-top: 8px;
	font-family: var(--mono);
	font-size: 10.5px;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.mtable-wrap { min-width: 0; }

.mtable { width: 100%; border-collapse: collapse; }

.mtable th {
	padding: 0 0 12px;
	border-bottom: 1px solid var(--rule);
	font-family: var(--mono);
	font-size: 10.5px;
	font-weight: 500;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--ink-3);
	text-align: left;
	transition: var(--tr-color);
}

.mtable th.r { text-align: right; }

.mtable td {
	padding: 17px 0;
	border-bottom: 1px solid var(--rule-2);
	font-size: 14px;
	vertical-align: middle;
	transition: var(--tr-color);
}

.mtable tbody tr {
	opacity: 0;
	transform: translateY(9px);
}

.is-in .mtable tbody tr {
	opacity: 1;
	transform: none;
	transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
	transition-delay: var(--d, 0ms);
}

.mtable td.r {
	text-align: right;
	font-family: var(--mono);
	font-variant-numeric: tabular-nums;
	white-space: nowrap;
}

.mname {
	display: flex;
	align-items: center;
	gap: 10px;
	font-weight: 500;
	letter-spacing: -0.005em;
	word-break: break-all;
}

.mname i {
	flex: 0 0 8px;
	width: 8px;
	height: 8px;
	background: var(--accent);
	transition: var(--tr-color);
}

.mbar {
	display: flex;
	align-items: center;
	gap: 12px;
	min-width: 132px;
}

.mbar .bar {
	position: relative;
	flex: 1 1 auto;
	height: 3px;
	background: var(--rule-2);
	overflow: hidden;
	transition: var(--tr-color);
}

.mbar .bar i {
	position: absolute;
	inset: 0 auto 0 0;
	width: 0;
	background: var(--accent);
	transition: width 1.15s var(--ease), background-color 0.45s var(--ease-soft);
}

.mbar .pct {
	flex: 0 0 auto;
	font-family: var(--mono);
	font-size: 11.5px;
	color: var(--ink-2);
	transition: var(--tr-color);
}

.mempty {
	padding: 40px 0;
	font-size: 14px;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.mdots { margin-top: 22px; }

.mdots .dot {
	display: inline-flex;
	align-items: center;
	gap: 7px;
	margin: 0 16px 8px 0;
	font-family: var(--mono);
	font-size: 11px;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.mdots .dot i {
	width: 8px;
	height: 8px;
	background: var(--accent);
	transition: var(--tr-color);
}

/* ---------- 能力目录 ---------- */

.catalog {
	margin: 0;
	padding: 0;
	list-style: none;
	border-top: 1px solid var(--rule);
	transition: var(--tr-color);
}

.cat-item {
	position: relative;
	display: grid;
	grid-template-columns: 62px minmax(0, 0.95fr) minmax(0, 1.25fr);
	gap: clamp(16px, 3vw, 40px);
	align-items: baseline;
	padding: 27px 0;
	border-bottom: 1px solid var(--rule-2);
	transition: var(--tr-color);
}

.cat-item::before {
	content: "";
	position: absolute;
	inset: 0;
	background: var(--accent-soft);
	opacity: 0;
	transform: scaleX(0.985);
	transform-origin: 0 50%;
	transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
	pointer-events: none;
}

.cat-item:hover::before { opacity: 1; transform: none; }

.cat-num {
	font-family: var(--mono);
	font-size: 12px;
	letter-spacing: 0.1em;
	color: var(--accent);
	transition: var(--tr-color);
}

.cat-t {
	margin: 0;
	font-size: 17.5px;
	font-weight: 600;
	letter-spacing: -0.012em;
	transition: var(--tr-color);
}

.cat-d {
	margin: 0;
	font-size: 14.5px;
	color: var(--ink-2);
	transition: var(--tr-color);
}

/* ---------- 入口 ---------- */

.entries {
	display: grid;
	grid-template-columns: minmax(0, 1fr);
	gap: 18px;
}

.entry {
	position: relative;
	display: block;
	padding: 26px 24px;
	border: 1px solid var(--rule);
	background-color: var(--paper-2);
	transition: var(--tr-color), transform 0.55s var(--ease);
}

.entry:hover {
	border-color: var(--ink-3);
	transform: translateY(-2px);
}

.entry-k {
	display: block;
	font-family: var(--mono);
	font-size: 10.5px;
	letter-spacing: 0.15em;
	text-transform: uppercase;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.entry-t {
	display: block;
	margin-top: 12px;
	font-size: 19px;
	font-weight: 600;
	letter-spacing: -0.015em;
	transition: var(--tr-color);
}

.entry-arw {
	position: absolute;
	top: 26px;
	right: 24px;
	width: 15px;
	height: 1px;
	background: var(--ink-3);
	transition: var(--tr-color), transform 0.55s var(--ease);
}

.entry-arw::after {
	content: "";
	position: absolute;
	right: 0;
	top: -2.5px;
	width: 6px;
	height: 6px;
	border-top: 1px solid var(--ink-3);
	border-right: 1px solid var(--ink-3);
	transform: rotate(45deg);
	transition: border-color 0.45s var(--ease-soft);
}

.entry:hover .entry-arw { transform: translateX(5px); }

/* ---------- 页脚 ---------- */

.foot {
	padding: 42px 0 56px;
	transition: var(--tr-color);
}

.foot-in {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 16px 28px;
}

.foot-brand {
	display: flex;
	align-items: center;
	gap: 10px;
	font-size: 14px;
	font-weight: 600;
	transition: var(--tr-color);
}

.foot-brand .brand-mark {
	width: 24px;
	height: 24px;
	font-size: 10px;
}

.foot-note {
	font-family: var(--mono);
	font-size: 11px;
	letter-spacing: 0.08em;
	color: var(--ink-3);
	transition: var(--tr-color);
}

.foot-copy {
	margin-left: auto;
	font-family: var(--mono);
	font-size: 11px;
	letter-spacing: 0.08em;
	color: var(--ink-3);
	transition: var(--tr-color);
}

/* ---------- 响应式 ---------- */

@media (max-width: 1000px) {
	.hero-grid { grid-template-columns: minmax(0, 1fr); }
	.hero-side { position: static; max-width: 420px; }
	.meters { grid-template-columns: minmax(0, 1fr); }
	.ring-wrap { max-width: 250px; }
}

@media (max-width: 860px) {
	.brand-tag { display: none; }
	.burger { display: grid; }
	.nav {
		position: absolute;
		top: var(--nav-h);
		left: 0;
		right: 0;
		flex-direction: column;
		align-items: stretch;
		gap: 0;
		margin: 0;
		padding: 6px var(--gut) 14px;
		background-color: var(--paper-2);
		border-bottom: 1px solid var(--rule);
		opacity: 0;
		visibility: hidden;
		transform: translateY(-8px);
		transition: opacity 0.45s var(--ease), transform 0.45s var(--ease), visibility 0.45s, var(--tr-color);
	}
	.nav.open { opacity: 1; visibility: visible; transform: none; }
	.nav a {
		padding: 13px 0;
		border-bottom: 1px solid var(--rule-2);
		font-size: 15px;
	}
	.nav a:last-child { border-bottom: 0; }
	.nav a::after { display: none; }
	.tools { margin-left: auto; }
}

@media (max-width: 640px) {
	:root { --gut: 20px; --nav-h: 60px; }
	.cat-item {
		grid-template-columns: 38px minmax(0, 1fr);
		gap: 8px 14px;
		padding: 22px 0;
	}
	.cat-d { grid-column: 2; }
	.entries { grid-template-columns: minmax(0, 1fr); }
	.entry { padding: 22px 20px; }
	.entry-arw { top: 22px; right: 20px; }

	.mtable thead { display: none; }
	.mtable, .mtable tbody, .mtable tr, .mtable td { display: block; width: 100%; }
	.mtable tr {
		position: relative;
		padding: 15px 0 17px;
		border-bottom: 1px solid var(--rule-2);
	}
	.mtable td {
		padding: 0;
		border: 0;
		font-size: 13.5px;
	}
	.mtable td.r {
		display: inline-block;
		width: auto;
		margin: 9px 16px 0 0;
		font-size: 12.5px;
		color: var(--ink-2);
	}
	.mtable td.mbar-cell { margin-top: 11px; }
	.mname { font-size: 15px; }
	.foot-copy { margin-left: 0; }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after {
		animation-duration: 0.001ms !important;
		transition-duration: 0.001ms !important;
	}
	.display .mask > span,
	.hero-side,
	.rise,
	.mtable tbody tr {
		opacity: 1 !important;
		transform: none !important;
	}
}

/* 控制面板入口（页脚，指向站内 /panel/） */
.foot-link {
	font-family: var(--mono);
	font-size: 11px;
	letter-spacing: 0.08em;
	color: var(--ink-2);
	text-decoration: none;
	border-bottom: 1px solid var(--rule);
	padding-bottom: 1px;
	transition: var(--tr-color);
}
.foot-link:hover,
.foot-link:focus-visible {
	color: var(--accent);
	border-bottom-color: var(--accent);
}