/* ============================================================
   HENGYUE demo — 工業製圖美學（industrial-utilitarian, refined）
   近白暖灰紙底 × 鋼墨 × 安全橘；工程圖尺寸線語彙；Plex 字體三兄弟。
   ============================================================ */
:root {
	--paper: oklch(0.968 0.004 95);
	--paper-dim: oklch(0.938 0.005 95);
	--paper-sunk: oklch(0.955 0.004 95);
	--ink: oklch(0.245 0.018 250);
	--ink-deep: oklch(0.19 0.02 250);
	--text: oklch(0.34 0.015 250);
	--text-soft: oklch(0.47 0.014 250);
	--text-faint: oklch(0.6 0.01 250);
	--hairline: oklch(0.885 0.006 95);
	--hairline-strong: oklch(0.82 0.008 250);
	--accent: oklch(0.66 0.185 45);
	--accent-deep: oklch(0.56 0.17 42);
	--accent-faint: oklch(0.66 0.185 45 / 0.09);
	--blue-line: oklch(0.62 0.04 240); /* 尺寸線鋼藍 */
	--measure: 62ch;
	--font-display: 'Archivo', 'Noto Sans TC', system-ui, sans-serif;
	--font-body: 'IBM Plex Sans', 'Noto Sans TC', system-ui, sans-serif;
	--font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

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

body {
	margin: 0;
	font-family: var(--font-body);
	font-size: 1rem;
	line-height: 1.75;
	color: var(--text);
	background: var(--paper);
	-webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
	font-family: var(--font-display);
	color: var(--ink);
	line-height: 1.2;
	margin: 0;
	font-weight: 700;
	letter-spacing: -0.01em;
}

p { margin: 0; }
a { color: inherit; }
img, svg { max-width: 100%; display: block; }

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

:focus-visible {
	outline: 2px solid var(--accent-deep);
	outline-offset: 2px;
}

.wrap {
	max-width: 1140px;
	margin-inline: auto;
	padding-inline: clamp(1.1rem, 4vw, 2rem);
}

.kicker {
	font-family: var(--font-mono);
	font-size: 0.72rem;
	letter-spacing: 0.28em;
	text-transform: uppercase;
	color: var(--accent-deep);
	font-weight: 600;
}

.display { font-size: clamp(1.5rem, 3.4vw, 2.4rem); }

.hairline { border: 0; border-top: 1px solid var(--hairline); margin: 0; }

/* ---- 按鈕：工業風——方角、粗體、橘色實心＋鋼墨描邊 ---- */
.btn {
	display: inline-flex;
	align-items: center;
	gap: 0.6em;
	font-family: var(--font-display);
	font-weight: 700;
	font-size: 0.92rem;
	letter-spacing: 0.02em;
	padding: 0.85em 1.6em;
	background: var(--accent);
	color: oklch(0.99 0.003 95);
	border: 1px solid var(--accent-deep);
	border-radius: 2px;
	text-decoration: none;
	cursor: pointer;
	box-shadow: 0 1px 0 var(--accent-deep);
	transition: transform 0.15s, background 0.2s;
}
.btn:hover { background: var(--accent-deep); transform: translateY(-1px); }

.btn.ghost {
	background: transparent;
	color: var(--ink);
	border: 1px solid var(--hairline-strong);
	box-shadow: none;
}
.btn.ghost:hover { border-color: var(--ink); background: var(--paper-dim); }

/* ---- 進場（一輪就好） ---- */
.reveal {
	opacity: 0;
	transform: translateY(14px);
	animation: up 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
	animation-delay: var(--d, 0s);
}
@keyframes up {
	to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
	.reveal { animation: none; opacity: 1; transform: none; }
	html { scroll-behavior: auto; }
}

/* ---- 表單 ---- */
.field label {
	display: block;
	font-family: var(--font-mono);
	font-size: 0.72rem;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--text-soft);
	margin-bottom: 0.4rem;
}
.field input,
.field select,
.field textarea {
	width: 100%;
	font: inherit;
	color: var(--ink);
	background: var(--paper-sunk);
	border: 1px solid var(--hairline-strong);
	border-radius: 2px;
	padding: 0.7em 0.85em;
	transition: border-color 0.2s, background 0.2s;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
	outline: none;
	border-color: var(--accent);
	background: oklch(0.985 0.003 95);
}
.field textarea { min-height: 140px; resize: vertical; }
.hp { position: absolute; left: -9999px; opacity: 0; } /* honeypot——取代圖形驗證碼 */