/* ==========================================================================
   LAYER 2 / 4 - BASE
   Reset + typography + layout primitives
   --------------------------------------------------------------------------
   Verbatim copy of the original main.css lines 1-617. Rule order is unchanged,
   so the cascade behaves exactly as before the split.

   Contents: Reset | Basic | Container | Row | Reusable

   [Round 29] The Google Fonts @import that used to sit on line 11 has been
   moved to a <link rel="preconnect"> + <link rel="stylesheet"> pair in the
   document head. An @import inside a stylesheet cannot start until base.css
   itself has downloaded AND been parsed, which serialised the chain:
   html -> base.css -> googleapis CSS -> gstatic woff2. A head <link> with
   preconnect starts the same request in parallel with the other CSS layers
   and removes one full round trip. The font requested is unchanged
   (Inter 300/400/500/600, swap), so every text metric is untouched.
   ========================================================================== */


html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
	display: block;
}

body {
	line-height: 1;
}

ol,
ul {
	list-style: none;
}

blockquote,
q {
	quotes: none;
}

blockquote:before,
blockquote:after,
q:before,
q:after {
	content: '';
	content: none;
}

table {
	border-collapse: collapse;
	border-spacing: 0;
}

body {
	-webkit-text-size-adjust: none;
}

mark {
	background-color: transparent;
	color: inherit;
}

input,
select,
textarea {
	-webkit-appearance: none;
	appearance: none;
}

/* Form controls do not inherit type by default, which left every button and
   input rendering in Arial while the rest of the page used Inter. */
input,
select,
textarea,
button {
	font: inherit;
}

/* Basic */

html {
	box-sizing: border-box;
}

*,
*:before,
*:after {
	box-sizing: inherit;
}

body {
	font-size: var(--fs-base);
	background-color: var(--c-border-4);

	/* 核心修改：首选 Inter 字体，其次调用苹果系统原生字体，最后是常规无衬线 */
	font-family: var(--font-sans);

	/* 建议：将原本带点绿色的浅灰 (var(--c-hex-878e83)) 改为深灰 (var(--c-text-5))，苹果官网正文通常是高对比度的深灰色，阅读体验更好 */
	color: var(--c-text-5);

	/* 注意：这里我删除了 letter-spacing: -1px; 让正文呼吸感更强，更像苹果官网 */
}

h1,
h2,
h3,
h4 {
	color: var(--c-text-1);
	font-weight: normal;
}


h2 {
	font-size: var(--fs-lg);
	/* 苹果的大标题通常比较有视觉张力，推荐放大到 2em */
	font-weight: 600;
	/* 半粗体 (Semi-bold)，增加标题的分量感 */
	color: var(--c-text-1);
	/* 苹果官方最爱用的经典深灰色，比纯黑更有呼吸感 */
	letter-spacing: -0.02em;
	/* 极微弱的负字距，让英文字母看起来更紧凑高级，去除原本粗暴的 -1px */
	margin-bottom: 0.8em;
	/* 增加标题和下方正文的留白距离（呼吸感） */
	line-height: 1.2;
	/* 确保标题换行时行距紧凑 */
}

/* ========================================= */
/* 缩小主内容区标题与下方内容之间的间距           */
/* ========================================= */

#main section h2 {
	/* 强行缩小底部的外边距。你可以将 10px 改为 5px 甚至 0 来看看哪个效果最紧凑 */
	margin-bottom: 10px !important;
}

h3,
h4 {
	color: var(--c-text-1);
	margin-bottom: 0.5em;
}

h3 {
	font-size: var(--fs-md);
	margin-bottom: 0.8em;
}

h4 {
	font-size: var(--fs-base);
}

p,
ul {
	margin-bottom: 1.25em;
}

p {
	line-height: 1.8em;
}

strong {
	color: var(--c-text-2);
}





ul {
	padding: 0.25em 0 0 0;
}

a {
	color: var(--c-primary);
	text-decoration: underline;
}

a:hover {
	text-decoration: none;
}

*>p:last-child {
	margin-bottom: 0;
}

section,
article {
	margin: 0 0 60px 0;
}

section:last-child,
article:last-child {
	margin-bottom: 0;
}

/* Container */

.container {
    margin: 0 auto;
    width: var(--shell-w);       /* 版心：隨視口 1200 → 1600，兩側各留 60px */
    min-width: var(--shell-w);   /* 下限仍是 1200px（clamp 的底） */
    max-width: none;     /* 上限由 clamp 控制（1600px） */
}

/* 給 body 也加上最小寬度，防止背景圖變形 */
body {
    min-width: 1200px;
    overflow-x: auto; /* 允許橫向滑動 */
}

/* Row */

.row {
	display: flex;
	flex-wrap: wrap;
	box-sizing: border-box;
	align-items: stretch;
}

.row>* {
	box-sizing: border-box;
}





























































.row>.col-12 {
	width: 100%;
}



























.row {
	margin-top: -50px;
	margin-left: -50px;
}

.row>* {
	padding: 50px 0 0 50px;
}






















/* Reusable */



















/* Primary button. Part of the shared button system: one radius, one weight,
   one motion across every button on the page (see components.css). */
.button {
	display: inline-block;
	padding: var(--sp-3) var(--sp-4);
	background-color: var(--c-primary);
	border-radius: var(--r-sm);
	text-decoration: none;
	color: var(--c-white);
	font-size: var(--fs-md);
	font-weight: 600;
	letter-spacing: normal;
	transition: all var(--dur-fast) var(--ease-out);
}

.button:hover {
	background-color: var(--c-primary-hover);
}