/* 設計系統(延續咻網址風格),支援深淺色跟隨系統 */
:root {
	--brand: #14508c; --brand-dark: #0e3a66; --brand-light: #eaf1f8;
	--ink: #1a2733; --muted: #5b6b7a; --faint: #8b9aa8; --line: #dfe6ec;
	--bg: #f2f5f8; --card: #ffffff; --ok: #1c7c43; --radius: 12px;
	color-scheme: light;
}
@media (prefers-color-scheme: dark) {
	:root {
		--brand: #5b9bd9; --brand-dark: #7ab0e2; --brand-light: #1c2a3a;
		--ink: #e7edf4; --muted: #a7b5c2; --faint: #7a8998; --line: #2b3644;
		--bg: #0f151c; --card: #171f2a; --ok: #57c584;
		color-scheme: dark;
	}
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
	font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
	background: var(--bg); color: var(--ink); line-height: 1.6;
	min-height: 100vh; display: flex; flex-direction: column;
}
.topbar { background: var(--card); border-bottom: 1px solid var(--line); padding: 14px 24px; }
.brand { font-weight: 700; font-size: 1.2rem; color: var(--brand); text-decoration: none; }
.container {
	width: 100%; max-width: 720px; margin: 32px auto; padding: 0 20px; flex: 1 0 auto;
}
h1 { font-size: 1.5rem; margin-bottom: 6px; }
.subtitle { color: var(--muted); margin-bottom: 24px; }

/* 首頁工具卡片 */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.tool-card {
	background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
	padding: 18px; text-decoration: none; color: inherit; transition: border-color 0.15s, transform 0.05s;
}
.tool-card:hover { border-color: var(--brand); }
.tool-card h3 { color: var(--brand); font-size: 1.05rem; margin-bottom: 6px; }
.tool-card p { color: var(--muted); font-size: 0.88rem; }

/* 工具表單 */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; background: var(--card);
	border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.calc label { display: flex; flex-direction: column; font-size: 0.9rem; color: var(--ink); font-weight: 500; gap: 6px; }
.calc input {
	padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 9px;
	font-size: 1rem; background: var(--card); color: var(--ink); font-family: inherit;
}
.calc input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(20,80,140,0.12); }
.calc select {
	padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 9px;
	font-size: 1rem; background: var(--card); color: var(--ink); font-family: inherit;
}
.calc select:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(20,80,140,0.12); }

/* 表單內的進階參數收合區:佔滿整列,攤開後內部維持兩欄 */
.calc-adv { grid-column: 1 / -1; border-top: 1px dashed var(--line); padding-top: 10px; }
.calc-adv summary { cursor: pointer; font-size: 0.9rem; color: var(--muted); }
.calc-adv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 12px; }
@media (max-width: 520px) { .calc-adv-grid { grid-template-columns: 1fr; } }

/* 結果 */
.result { margin: 20px 0; background: var(--brand-light); border-radius: var(--radius); padding: 20px; text-align: center; }
.result-main { font-size: 1.1rem; color: var(--ink); }
.result-main strong { font-size: 1.6rem; color: var(--brand); }
.result-sub { color: var(--muted); font-size: 0.9rem; margin-top: 6px; }

/* 說明與 FAQ */
.explain { margin-top: 28px; }
.explain h2 { font-size: 1.1rem; margin: 20px 0 8px; }
.explain p { color: var(--muted); margin-bottom: 10px; font-size: 0.95rem; }
.explain details { background: var(--card); border: 1px solid var(--line); border-radius: 9px; padding: 12px 16px; margin-bottom: 8px; }
.explain summary { cursor: pointer; font-weight: 500; }
.explain details p { margin-top: 8px; }

/* 逐年明細表 */
.yearly-wrap { background: var(--card); border: 1px solid var(--line); border-radius: 9px; padding: 12px 16px; margin: 16px 0; }
.yearly-wrap summary { cursor: pointer; font-weight: 500; }
.yearly { overflow-x: auto; margin-top: 10px; }
.yearly table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.yearly th, .yearly td { padding: 6px 10px; text-align: right; border-bottom: 1px solid var(--line); }
.yearly th:first-child, .yearly td:first-child { text-align: left; }

/* 分享按鈕(共用元件,share.js 產生) */
.share-bar { margin: 14px 0; text-align: center; display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; align-items: center; }
.share-btn {
	background: var(--brand); color: #fff; border: none; border-radius: 9px;
	padding: 10px 18px; font-size: 0.95rem; font-family: inherit; cursor: pointer;
}
.share-btn:hover { background: var(--brand-dark); }
.share-btn-secondary { background: var(--card); color: var(--brand); border: 1.5px solid var(--brand); }
.share-btn-secondary:hover { background: var(--brand-light); }
.share-opt { display: inline-flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--muted); cursor: pointer; }
.share-group {
	display: inline-flex; align-items: center; gap: 10px;
	background: var(--brand-light); border-radius: 12px; padding: 6px 12px 6px 6px;
}

/* 複製成功的跳出提示:畫面正中央,想不看到都難 */
.share-toast {
	position: fixed; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(0.95);
	background: var(--ink); color: var(--bg); padding: 18px 32px; border-radius: 12px;
	font-size: 1.1rem; font-weight: 500; box-shadow: 0 8px 32px rgba(0,0,0,0.35);
	opacity: 0; pointer-events: none; transition: opacity 0.15s, transform 0.15s; z-index: 999;
}
.share-toast.show { opacity: 1; transform: translate(-50%, -50%) scale(1); }

.ad-slot { margin: 16px 0; min-height: 90px; }
.other-tools { margin-top: 32px; border-top: 1px solid var(--line); padding-top: 16px; }
.other-tools h2 { font-size: 1rem; margin-bottom: 8px; }
.other-tools ul { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.other-tools a { color: var(--brand); text-decoration: none; font-size: 0.92rem; }

.footer { text-align: center; color: var(--faint); font-size: 0.85rem; padding: 28px; }

@media (max-width: 520px) { .calc { grid-template-columns: 1fr; } }