/* ==========================================================================
   accounting-audit.css — 会计审计服务页面专属样式
   品牌色：#d7000f（基于天扬君合主色）
   ========================================================================== */

:root {
	--aa-primary: #d7000f;
	--aa-primary-dark: #a8000c;
	--aa-primary-light: #ffe6e8;
	--aa-primary-soft: #fff5f6;
	--aa-text: #2a2a2a;
	--aa-text-light: #666;
	--aa-text-muted: #999;
	--aa-bg: #ffffff;
	--aa-bg-gray: #f7f7f9;
	--aa-border: #ececec;
	--aa-shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
	--aa-shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
	--aa-shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.12);
	--aa-shadow-primary: 0 10px 25px rgba(215, 0, 15, 0.25);
	--aa-radius: 12px;
	--aa-radius-sm: 8px;
	--aa-radius-lg: 16px;
	--aa-ease: cubic-bezier(0.4, 0, 0.2, 1);
	--aa-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 让主题默认字体不影响，box-sizing 统一 */
.aa-banner,
.aa-section,
.aa-advantages-section,
.aa-banner *,
.aa-section *,
.aa-advantages-section * {
	box-sizing: border-box;
}

/* ==================== Tax Services ==================== */
.tax-services-section {
	padding: 92px 40px 106px;
	background: #fff;
	font-family: "Microsoft YaHei", Arial, sans-serif;
}
.tax-services-section * { box-sizing: border-box; }
.tax-services-inner { max-width: 1300px; margin: 0 auto; }
.tax-services-heading { display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 62px; text-align: left;position: relative; }
.tax-services-heading > span { font: 800 64px/.78 Arial, sans-serif; letter-spacing: 1px; text-transform: uppercase; color: #f7f7f7; }
.tax-services-heading h2 { margin: 0 0 3px; color: #222; font-size: 36px; text-align:center; font-weight: 700; line-height: 1.2; }
.tax-services-heading p { margin: 0; color: #888; font-size: 15px; line-height: 1.4; }
.tax-services-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px 17px; }
.tax-service-card { display: flex; flex-direction: column; min-height: 320px; background: #fff; border: 1px solid #e7e7e7; overflow: hidden; transition: border-color .25s ease, box-shadow .25s ease, transform .25s ease; }
.tax-service-card:hover { border-color: #2c66ff; box-shadow: 0 12px 26px rgba(29, 58, 104, .12); transform: translateY(-3px); }
.tax-service-card-head { background: url("../images/service/tax-service-index-bg.png") no-repeat;background-size: 100% 100%; position: relative; min-height: 88px; padding: 20px 32px; overflow: hidden; }
/* .tax-service-card-head::before, .tax-service-card-head::after { content: ""; position: absolute; pointer-events: none; } */
/* .tax-service-card-head::before { right: -26px; top: -68px; width: 154px; height: 154px; border: 1px solid rgba(152, 170, 190, .25); box-shadow: 0 0 0 13px rgba(152, 170, 190, .08), 0 0 0 27px rgba(152, 170, 190, .045); transform: rotate(45deg); } */
.tax-service-card-head::after { right: 32px; bottom: 12px; width: 44px; height: 24px; border: 4px solid rgba(142, 160, 181, .4); border-top-width: 7px; box-shadow: 10px -10px 0 -7px rgba(142, 160, 181, .38), 20px -20px 0 -14px rgba(142, 160, 181, .3); }
.tax-service-card-head h3, .tax-service-card-head p { position: relative; z-index: 1; }
.tax-service-card-head h3 { margin: 0 0 5px; font-size: 24px; line-height: 1.15; }
.tax-service-card-head h3 a { color: #202020; text-decoration: none; }
.tax-service-card-head h3 a:hover { color: #e60012; }
.tax-service-card-head p { margin: 0; color: #a3a3a3; font-size: 14px; line-height: 1.35; }
.tax-service-list { flex: 1; margin: 0; padding: 19px 32px 16px; list-style: none; }
.tax-service-list li { position: relative; margin: 0 0 12px; padding-left: 11px; color: #666; font-size: 14px; line-height: 1.35; }
.tax-service-list li::before { content: ""; position: absolute; left: 0; top: .6em; width: 3px; height: 3px; background: #999; border-radius: 50%; }
.tax-service-list a { color: inherit; text-decoration: none; transition: color .2s ease; }
.tax-service-list a:hover { color: #e60012; }
.tax-service-more { display: flex; align-items: center; justify-content: center; width: 172px; height: 34px; margin: 0 auto 48px; border-radius: 18px; background: #f90808; color: #fff; font-size: 12px; font-weight: 700; line-height: 1; text-decoration: none; transition: background .2s ease, transform .2s ease; }
.tax-service-more span { margin-left: 3px; font-size: 15px; font-weight: 400; }
.tax-service-more:hover { background: #d7000f; color: #fff; transform: translateY(-2px); }

@media (max-width: 900px) {
	.tax-services-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
	.tax-services-section { padding: 64px 20px 72px; }
	.tax-services-heading { justify-content: flex-start; margin-bottom: 38px; }
	.tax-services-heading > span { font-size: 42px; }
	.tax-services-heading h2 { font-size: 24px; }
	.tax-services-grid { grid-template-columns: 1fr; gap: 16px; }
	.tax-service-card { min-height: 296px; }
	.tax-service-card-head, .tax-service-list { padding-left: 24px; padding-right: 24px; }
	.tax-service-more { margin-bottom: 30px; }
}

/* ==================== Banner ==================== */
.aa-banner {
	position: relative;
	width: 100%;
	height: 520px;
	overflow: hidden;
	color: #fff;
	display: flex;
	align-items: center;
	isolation: isolate;
}

.aa-banner-bg {
	position: absolute;
	inset: 0;
	background: linear-gradient(135deg, #1a1a1a 0%, #2a1a1c 60%, #4a1015 100%);
	z-index: 0;
}

.aa-banner-placeholder {
	position: absolute;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	color: rgba(255, 255, 255, 0.18);
	font-size: 64px;
	font-weight: 800;
	letter-spacing: 12px;
	pointer-events: none;
}

.aa-banner-black {
	position: absolute;
	inset: 0;
	z-index: 1;
}

/* 红色斜带（左侧） */
.aa-banner-slash {
	position: absolute;
	left: -80px;
	top: 0;
	width: 360px;
	height: 100%;
	background: linear-gradient(135deg, var(--aa-primary) 0%, var(--aa-primary-dark) 100%);
	transform: skewX(-15deg);
	z-index: 2;
	box-shadow: 0 0 60px rgba(215, 0, 15, 0.5);
}

.aa-banner-slash::after {
	content: '';
	position: absolute;
	inset: 0;
	background: linear-gradient(180deg, rgba(255, 255, 255, 0.2) 0%, transparent 50%, rgba(0, 0, 0, 0.15) 100%);
}

/* 浮动光斑 */
.aa-banner-glow {
	position: absolute;
	border-radius: 50%;
	background: radial-gradient(circle, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 70%);
	pointer-events: none;
	z-index: 1;
	filter: blur(8px);
}
.aa-glow-1 {
	width: 220px;
	height: 220px;
	top: -40px;
	right: 15%;
	animation: aaFloat1 9s ease-in-out infinite;
}
.aa-glow-2 {
	width: 160px;
	height: 160px;
	bottom: 20%;
	left: 35%;
	background: radial-gradient(circle, rgba(255, 80, 90, 0.45) 0%, transparent 70%);
	animation: aaFloat2 11s ease-in-out infinite;
}
.aa-glow-3 {
	width: 280px;
	height: 280px;
	bottom: -80px;
	right: 8%;
	background: radial-gradient(circle, rgba(255, 200, 100, 0.25) 0%, transparent 70%);
	animation: aaFloat3 13s ease-in-out infinite;
}

@keyframes aaFloat1 {
	0%, 100% { transform: translate(0, 0) scale(1); }
	50% { transform: translate(-30px, 40px) scale(1.1); }
}
@keyframes aaFloat2 {
	0%, 100% { transform: translate(0, 0) scale(1); }
	50% { transform: translate(40px, -30px) scale(0.9); }
}
@keyframes aaFloat3 {
	0%, 100% { transform: translate(0, 0) scale(1); }
	50% { transform: translate(-50px, -40px) scale(1.15); }
}

.aa-banner-inner {
	position: relative;
	z-index: 5;
	max-width: 1300px;
	margin: 0 auto;
	width: 100%;
	padding: 0 40px;
}

/* 面包屑 */
.aa-breadcrumbs {
	font-size: 13px;
	color: rgba(255, 255, 255, 0.85);
	letter-spacing: 1px;
	margin-bottom: 28px;
	opacity: 0;
	animation: aaFadeInDown 0.8s 0.2s var(--aa-ease) forwards;
}
.aa-breadcrumbs a {
	color: rgba(255, 255, 255, 0.85);
	text-decoration: none;
	transition: color 0.2s;
}
.aa-breadcrumbs a:hover {
	color: #fff;
}
.aa-breadcrumbs .aa-sep {
	margin: 0 8px;
	opacity: 0.5;
}
.aa-breadcrumbs .aa-cur {
	color: var(--aa-primary);
	font-weight: 600;
}

.aa-banner-title {
	font-size: 56px;
	font-weight: 800;
	line-height: 1.25;
	margin: 0 0 24px;
	text-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
}
.aa-banner-title .aa-line {
	display: block;
	opacity: 0;
	transform: translateY(30px);
	animation: aaFadeInUp 0.9s var(--aa-ease) forwards;
}
.aa-banner-title .aa-line:nth-child(1) { animation-delay: 0.4s; }
.aa-banner-title .aa-line:nth-child(2) { animation-delay: 0.6s; }

.aa-banner-subtitle {
	font-size: 18px;
	letter-spacing: 6px;
	color: rgba(255, 255, 255, 0.9);
	opacity: 0;
	animation: aaFadeInUp 0.9s 0.8s var(--aa-ease) forwards;
}
.aa-banner-subtitle span {
	display: inline-block;
	padding: 0 4px;
}
.aa-banner-subtitle i {
	display: inline-block;
	width: 1px;
	height: 14px;
	background: rgba(255, 255, 255, 0.5);
	vertical-align: middle;
	margin: 0 6px;
	transform: translateY(-1px);
}

/* 底部波浪 */
.aa-banner-wave {
	position: absolute;
	bottom: -1px;
	left: 0;
	width: 100%;
	height: 80px;
	z-index: 4;
	pointer-events: none;
}

@keyframes aaFadeInDown {
	from { opacity: 0; transform: translateY(-20px); }
	to { opacity: 1; transform: translateY(0); }
}
@keyframes aaFadeInUp {
	from { opacity: 0; transform: translateY(30px); }
	to { opacity: 1; transform: translateY(0); }
}

/* ==================== 通用 Section ==================== */
.aa-section {
	max-width: 1300px;
	margin: 0 auto;
	padding: 100px 40px;
	position: relative;
}

.aa-section-head {
	text-align: center;
	margin-bottom: 60px;
}

.aa-section-title {
	font-size: 36px;
	font-weight: 700;
	color: var(--aa-text);
	margin: 0 0 14px;
	letter-spacing: 2px;
	position: relative;
	display: inline-block;
}
.aa-section-title::after {
	content: '';
	display: block;
	width: 50px;
	height: 3px;
	background: var(--aa-primary);
	margin: 16px auto 0;
	border-radius: 2px;
	transform-origin: center;
	transition: width 0.6s var(--aa-ease);
}
.aa-reveal.aa-visible .aa-section-title::after {
	width: 90px;
}

.aa-section-title-sub {
	font-size: 14px;
	color: var(--aa-text-muted);
	letter-spacing: 4px;
	margin: 0;
	text-transform: uppercase;
}

/* ==================== 关于我们 ==================== */
.aa-about-wrap {
	display: flex;
	flex-direction: column;
}

.aa-about {
	display: flex;
	gap: 60px;
	align-items: center;
}

.aa-about-img {
	flex: 0 0 45%;
	height: 400px;
	background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
	border-radius: var(--aa-radius-lg);
	display: flex;
	align-items: center;
	justify-content: center;
	color: #b8b8b8;
	font-size: 16px;
	font-weight: 600;
	letter-spacing: 4px;
	box-shadow: var(--aa-shadow-md);
	position: relative;
	overflow: hidden;
}
.aa-about-img::before {
	content: '';
	position: absolute;
	inset: 0;
	background:
		linear-gradient(45deg, transparent 48%, rgba(215, 0, 15, 0.05) 49%, rgba(215, 0, 15, 0.05) 51%, transparent 52%),
		linear-gradient(-45deg, transparent 48%, rgba(215, 0, 15, 0.05) 49%, rgba(215, 0, 15, 0.05) 51%, transparent 52%);
	background-size: 30px 30px;
}
.aa-about-img::after {
	content: '';
	position: absolute;
	top: 20px;
	left: 20px;
	right: 20px;
	bottom: 20px;
	border: 2px dashed rgba(215, 0, 15, 0.15);
	border-radius: var(--aa-radius);
	pointer-events: none;
}
.aa-img-placeholder {
	position: relative;
	z-index: 1;
	text-align: center;
	width: 100%;
	height: 100%;
}
/* .aa-img-placeholder::before {
	content: '';
	display: block;
	width: 64px;
	height: 64px;
	margin: 0 auto 16px;
	border: 2px solid #d0d0d0;
	border-radius: 12px;
	background: linear-gradient(135deg, #f8f8f8, #ececec);
} */

.aa-about-text {
	flex: 1;
}

.aa-about-h3 {
	font-size: 28px;
	font-weight: 700;
	color: var(--aa-text);
	margin: 0 0 24px;
	padding-left: 16px;
	border-left: 4px solid var(--aa-primary);
	line-height: 1.2;
}

.aa-about-text p {
	color: var(--aa-text-light);
	line-height: 1.95;
	font-size: 15px;
	margin: 0 0 18px;
}

.aa-about-stats {
	display: flex;
	gap: 20px;
	margin: 30px 0 36px;
	padding: 24px 0;
	border-top: 1px solid var(--aa-border);
	border-bottom: 1px solid var(--aa-border);
}

.aa-stat {
	flex: 1;
	text-align: center;
	position: relative;
}
.aa-stat + .aa-stat::before {
	content: '';
	position: absolute;
	left: 0;
	top: 50%;
	transform: translateY(-50%);
	width: 1px;
	height: 36px;
	background: var(--aa-border);
}
.aa-stat-num {
	font-size: 32px;
	font-weight: 800;
	color: var(--aa-primary);
	line-height: 1.1;
	margin-bottom: 6px;
}
.aa-stat-num .aa-counter {
	font-size: inherit;
	font-weight: inherit;
	color: inherit;
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
.aa-stat-label {
	font-size: 13px;
	color: var(--aa-text-muted);
	letter-spacing: 1px;
}

/* ==================== 按钮 ==================== */
.aa-cta-btn {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	background: linear-gradient(135deg, var(--aa-primary) 0%, var(--aa-primary-dark) 100%);
	color: #fff !important;
	padding: 14px 38px;
	border-radius: 30px;
	text-decoration: none;
	font-size: 15px;
	font-weight: 500;
	letter-spacing: 1px;
	box-shadow: var(--aa-shadow-primary);
	transition: all 0.35s var(--aa-ease);
	position: relative;
	overflow: hidden;
	cursor: pointer;
	border: none;
}
.aa-cta-btn::before {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	width: 0;
	height: 0;
	border-radius: 50%;
	background: rgba(255, 255, 255, 0.3);
	transform: translate(-50%, -50%);
	transition: width 0.6s, height 0.6s;
}
.aa-cta-btn:hover {
	transform: translateY(-2px);
	box-shadow: 0 14px 32px rgba(215, 0, 15, 0.4);
}
.aa-cta-btn:hover::before {
	width: 300px;
	height: 300px;
}
.aa-cta-btn > * {
	position: relative;
	z-index: 1;
}
.aa-cta-mini {
	padding: 10px 24px;
	font-size: 14px;
}

/* ==================== 我们的服务 ==================== */
.aa-services-wrap {
	background: var(--aa-bg);
}

/* 服务区显式居中（防止被主题样式干扰） */
.aa-section.aa-services-wrap {
	width: 100%;
	max-width: 1300px;
	margin-left: calc(50% - 650px);
	box-sizing: border-box;
}

.aa-services-grid {
	display: grid;
	grid-template-columns: 2fr 1fr 1fr;
	grid-template-rows: auto auto;
	gap: 24px;
}

/* 第一行：审计审验（跨 2 列，左大） + 新型审计（1 列，右小）
   第二行：会计与财务 / 管理咨询 / 其他专业（各占 1 列） */
.aa-services-grid > .aa-service-card:nth-child(1) { grid-area: 1 / 1 / 2 / 3; }
.aa-services-grid > .aa-service-card:nth-child(2) { grid-area: 1 / 3 / 2 / 4; }
.aa-services-grid > .aa-service-card:nth-child(3) { grid-area: 2 / 1 / 3 / 2; }
.aa-services-grid > .aa-service-card:nth-child(4) { grid-area: 2 / 2 / 3 / 3; }
.aa-services-grid > .aa-service-card:nth-child(5) { grid-area: 2 / 3 / 3 / 4; }

.aa-service-card {
	background: #fff;
	border-radius: var(--aa-radius);
	padding: 36px 30px 30px;
	box-shadow: var(--aa-shadow-sm);
	border: 1px solid var(--aa-border);
	transition: transform 0.45s var(--aa-ease), box-shadow 0.45s var(--aa-ease), border-color 0.45s var(--aa-ease);
	position: relative;
	overflow: hidden;
	cursor: default;
}

/* 卡片顶部彩条（hover 展开） */
.aa-service-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 0;
	height: 3px;
	background: linear-gradient(90deg, var(--aa-primary), #ff6470, #ffb84d);
	transition: width 0.6s var(--aa-ease);
}
.aa-service-card:hover {
	transform: translateY(-10px);
	box-shadow: var(--aa-shadow-lg);
	border-color: rgba(215, 0, 15, 0.2);
}
.aa-service-card:hover::before {
	width: 100%;
}

/* 右上角装饰圆 */
.aa-service-card::after {
	content: '';
	position: absolute;
	top: -40px;
	right: -40px;
	width: 120px;
	height: 120px;
	background: var(--aa-primary-light);
	border-radius: 50%;
	opacity: 0.3;
	transition: all 0.6s var(--aa-ease);
}
.aa-service-card:hover::after {
	transform: scale(2.5);
	opacity: 0.1;
}

.aa-service-icon {
	width: 60px;
	height: 60px;
	border-radius: 14px;
	background: linear-gradient(135deg, var(--aa-primary-light) 0%, #fff 100%);
	color: var(--aa-primary);
	display: flex;
	align-items: center;
	justify-content: center;
	margin-bottom: 20px;
	position: relative;
	z-index: 1;
	transition: all 0.45s var(--aa-ease);
}
.aa-service-card:hover .aa-service-icon {
	background: linear-gradient(135deg, var(--aa-primary) 0%, var(--aa-primary-dark) 100%);
	color: #fff;
	transform: scale(1.05) rotate(-5deg);
}

.aa-service-title {
	font-size: 18px;
	font-weight: 700;
	color: var(--aa-text);
	margin: 0 0 6px;
	position: relative;
	z-index: 1;
	transition: color 0.3s;
}
.aa-service-card:hover .aa-service-title {
	color: var(--aa-primary);
}

.aa-service-subtitle {
	font-size: 13px;
	color: var(--aa-text-muted);
	margin: 0 0 18px;
	letter-spacing: 1px;
	position: relative;
	z-index: 1;
}

.aa-service-list {
	list-style: none;
	padding: 0;
	margin: 0;
	position: relative;
	z-index: 1;
}
.aa-service-list li {
	color: var(--aa-text-light);
	font-size: 14px;
	padding: 8px 0 8px 18px;
	border-bottom: 1px dashed var(--aa-border);
	position: relative;
	transition: all 0.25s;
}
.aa-service-list li:last-child {
	border-bottom: none;
}
.aa-service-list li::before {
	content: '';
	position: absolute;
	left: 0;
	top: 50%;
	width: 6px;
	height: 6px;
	border-radius: 50%;
	background: var(--aa-primary);
	transform: translateY(-50%);
	transition: all 0.3s var(--aa-ease-bounce);
}
.aa-service-list li:hover {
	color: var(--aa-primary);
	padding-left: 22px;
}
.aa-service-list li:hover::before {
	background: var(--aa-primary-dark);
	transform: translateY(-50%) scale(1.4);
	box-shadow: 0 0 0 4px rgba(215, 0, 15, 0.15);
}

/* 联系入口卡片 */
.aa-cta-card {
	background: linear-gradient(135deg, #fff 0%, var(--aa-primary-soft) 100%);
	border-color: rgba(215, 0, 15, 0.15);
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: flex-start;
}
.aa-cta-card .aa-cta-btn {
	margin-top: 16px;
}

/* ==================== Feature 卡片（带 tab 切换） ==================== */
.aa-service-card-feature {
	border: 2px solid var(--aa-primary);
	background: linear-gradient(135deg, #ffffff 0%, var(--aa-primary-soft) 100%);
	padding: 32px 30px 28px;
}

.aa-feature-header {
	display: flex;
	align-items: center;
	gap: 14px;
	margin-bottom: 22px;
}
.aa-feature-header .aa-service-icon {
	margin-bottom: 0;
	flex-shrink: 0;
}
.aa-feature-header .aa-service-title {
	margin-bottom: 4px;
}
.aa-feature-header .aa-service-subtitle {
	margin: 0;
}

/* Tab 切换条 */
.aa-tab-bar {
	display: flex;
	flex-wrap: wrap;
	gap: 6px;
	margin-bottom: 18px;
	padding: 5px;
	background: var(--aa-bg-gray);
	border-radius: 10px;
}
.aa-tab {
	padding: 9px 14px;
	border-radius: 7px;
	font-size: 13px;
	color: var(--aa-text-light);
	cursor: pointer;
	transition: all 0.25s var(--aa-ease);
	flex: 1;
	text-align: center;
	white-space: nowrap;
	user-select: none;
	background: transparent;
}
.aa-tab:hover {
	color: var(--aa-primary);
	background: rgba(215, 0, 15, 0.06);
}
.aa-tab.active {
	background: linear-gradient(135deg, var(--aa-primary) 0%, var(--aa-primary-dark) 100%);
	color: #fff;
	box-shadow: 0 4px 12px rgba(215, 0, 15, 0.28);
	font-weight: 500;
}

/* Tab 内容面板 */
.aa-tab-panel {
	display: none;
	min-height: 110px;
	animation: aaTabFadeIn 0.4s var(--aa-ease);
}
.aa-tab-panel.active {
	display: block;
}
@keyframes aaTabFadeIn {
	from { opacity: 0; transform: translateY(8px); }
	to { opacity: 1; transform: translateY(0); }
}

/* 底部按钮组 */
.aa-feature-footer {
	display: flex;
	gap: 12px;
	margin-top: 20px;
	flex-wrap: wrap;
}
.aa-link-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 10px 24px;
	border: 1px solid #d9d9d9;
	border-radius: 30px;
	color: var(--aa-text-light);
	background: #fff;
	text-decoration: none;
	font-size: 13px;
	letter-spacing: 1px;
	transition: all 0.3s var(--aa-ease);
	cursor: pointer;
}
.aa-link-btn:hover {
	border-color: var(--aa-primary);
	color: var(--aa-primary);
	transform: translateY(-2px);
	box-shadow: 0 6px 16px rgba(215, 0, 15, 0.12);
}

/* ==================== 优势区特殊图标：数智赋能 AI 字标 ==================== */
/* 用双类选择器 .aa-advantage-icon.aa-icon-ai 确保胜过基础 .aa-advantage-icon，避免几何/背景被覆盖 */
.aa-advantage-icon.aa-icon-ai {
	width: 88px;
	height: 88px;
	border-radius: 50%;
	/* 初始：跟其他三块一致——浅色渐变（白到浅红），AI 文字用品牌红 */
	background: linear-gradient(135deg, var(--aa-primary-light) 0%, #fff 100%);
	color: var(--aa-primary);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 28px;
	font-weight: 900;
	letter-spacing: 1px;
	box-shadow: 0 0 0 4px rgba(215, 0, 15, 0.04);
	position: relative;
	overflow: visible;
	transition: all 0.5s var(--aa-ease);
}
.aa-advantage-icon.aa-icon-ai::before {
	content: '';
	position: absolute;
	inset: -8px;
	border: 2px dashed var(--aa-primary);
	border-radius: 50%;
	opacity: 0.5;
	animation: aaSpin 14s linear infinite;
	transition: opacity 0.4s, border-color 0.4s;
}
.aa-advantage-icon.aa-icon-ai::after {
	content: '';
	position: absolute;
	inset: -16px;
	border: 1px solid rgba(215, 0, 15, 0.18);
	border-radius: 50%;
	opacity: 0;
	transition: opacity 0.4s, inset 0.5s var(--aa-ease);
}
/* hover：红底白字（跟其他三块一致） */
.aa-advantage-card:hover .aa-advantage-icon.aa-icon-ai {
	transform: scale(1.05);
	background: linear-gradient(135deg, var(--aa-primary) 0%, var(--aa-primary-dark) 100%);
	color: #fff;
	box-shadow:
		0 14px 32px rgba(215, 0, 15, 0.5),
		inset 0 -4px 0 rgba(0, 0, 0, 0.12),
		inset 0 2px 0 rgba(255, 255, 255, 0.3);
}
.aa-advantage-card:hover .aa-advantage-icon.aa-icon-ai::before {
	opacity: 0.85;
	border-color: rgba(255, 255, 255, 0.85);
}
.aa-advantage-card:hover .aa-advantage-icon.aa-icon-ai::after {
	opacity: 1;
	inset: -14px;
}

/* ==================== 四大优势 ==================== */
.aa-advantages-section {
	background: var(--aa-bg-gray);
	padding: 100px 40px;
	position: relative;
	overflow: hidden;
}
.aa-advantages-section::before {
	content: '';
	position: absolute;
	top: -200px;
	right: -200px;
	width: 500px;
	height: 500px;
	background: radial-gradient(circle, rgba(215, 0, 15, 0.04) 0%, transparent 70%);
	border-radius: 50%;
	pointer-events: none;
}
.aa-advantages-section::after {
	content: '';
	position: absolute;
	bottom: -150px;
	left: -150px;
	width: 400px;
	height: 400px;
	background: radial-gradient(circle, rgba(255, 184, 77, 0.05) 0%, transparent 70%);
	border-radius: 50%;
	pointer-events: none;
}

.aa-advantages {
	max-width: 1300px;
	margin: 0 auto;
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 28px;
	position: relative;
	z-index: 1;
}

.aa-advantage-card {
	text-align: center;
	padding: 48px 28px 40px;
	background: #fff;
	border-radius: var(--aa-radius);
	transition: transform 0.45s var(--aa-ease), box-shadow 0.45s var(--aa-ease);
	position: relative;
	overflow: hidden;
}

.aa-advantage-card::before {
	content: '';
	position: absolute;
	top: 0;
	left: 50%;
	width: 0;
	height: 4px;
	background: linear-gradient(90deg, var(--aa-primary), #ff6470);
	transform: translateX(-50%);
	transition: width 0.5s var(--aa-ease);
}
.aa-advantage-card:hover {
	transform: translateY(-12px);
	box-shadow: var(--aa-shadow-lg);
}
.aa-advantage-card:hover::before {
	width: 100%;
}

.aa-advantage-icon {
	width: 88px;
	height: 88px;
	border-radius: 50%;
	background: linear-gradient(135deg, var(--aa-primary-light) 0%, #fff 100%);
	color: var(--aa-primary);
	display: flex;
	align-items: center;
	justify-content: center;
	margin: 0 auto 24px;
	position: relative;
	transition: all 0.5s var(--aa-ease);
}
.aa-advantage-icon::before {
	content: '';
	position: absolute;
	inset: -8px;
	border: 2px dashed var(--aa-primary);
	border-radius: 50%;
	opacity: 0.35;
	animation: aaSpin 14s linear infinite;
}
.aa-advantage-icon::after {
	content: '';
	position: absolute;
	inset: -16px;
	border: 1px solid rgba(215, 0, 15, 0.15);
	border-radius: 50%;
	opacity: 0;
	transition: opacity 0.4s, inset 0.5s var(--aa-ease);
}
.aa-advantage-card:hover .aa-advantage-icon {
	background: linear-gradient(135deg, var(--aa-primary) 0%, var(--aa-primary-dark) 100%);
	color: #fff;
	transform: scale(1.05);
}
.aa-advantage-card:hover .aa-advantage-icon::after {
	opacity: 1;
	inset: -14px;
}

@keyframes aaSpin {
	to { transform: rotate(360deg); }
}

.aa-advantage-title {
	font-size: 19px;
	font-weight: 700;
	margin: 0 0 14px;
	color: var(--aa-text);
	position: relative;
	transition: color 0.3s;
}
.aa-advantage-card:hover .aa-advantage-title {
	color: var(--aa-primary);
}

.aa-advantage-desc {
	font-size: 13px;
	color: var(--aa-text-light);
	line-height: 1.85;
	margin: 0;
}

/* ==================== 滚动入场动画 ==================== */
.aa-reveal,
.aa-reveal-left,
.aa-reveal-right,
.aa-reveal-scale {
	opacity: 0;
	transition: opacity 0.9s var(--aa-ease), transform 0.9s var(--aa-ease);
	will-change: opacity, transform;
}

.aa-reveal { transform: translateY(50px); }
.aa-reveal-left { transform: translateX(-50px); }
.aa-reveal-right { transform: translateX(50px); }
.aa-reveal-scale { transform: scale(0.85) translateY(20px); }

.aa-reveal.aa-visible,
.aa-reveal-left.aa-visible,
.aa-reveal-right.aa-visible,
.aa-reveal-scale.aa-visible {
	opacity: 1;
	transform: translate(0, 0) scale(1);
}

/* 交错延时（卡片错开进入） */
.aa-services-grid .aa-reveal-scale:nth-child(1) { transition-delay: 0s; }
.aa-services-grid .aa-reveal-scale:nth-child(2) { transition-delay: 0.1s; }
.aa-services-grid .aa-reveal-scale:nth-child(3) { transition-delay: 0.2s; }
.aa-services-grid .aa-reveal-scale:nth-child(4) { transition-delay: 0.3s; }
.aa-services-grid .aa-reveal-scale:nth-child(5) { transition-delay: 0.4s; }

.aa-advantages .aa-reveal:nth-child(1) { transition-delay: 0s; }
.aa-advantages .aa-reveal:nth-child(2) { transition-delay: 0.12s; }
.aa-advantages .aa-reveal:nth-child(3) { transition-delay: 0.24s; }
.aa-advantages .aa-reveal:nth-child(4) { transition-delay: 0.36s; }

.aa-about-stats .aa-reveal-scale:nth-child(1) { transition-delay: 0s; }
.aa-about-stats .aa-reveal-scale:nth-child(2) { transition-delay: 0.1s; }
.aa-about-stats .aa-reveal-scale:nth-child(3) { transition-delay: 0.2s; }
.aa-about-stats .aa-reveal-scale:nth-child(4) { transition-delay: 0.3s; }

/* ==================== 响应式 ==================== */
@media (max-width: 1100px) {
	.aa-banner { height: 460px; }
	.aa-banner-title { font-size: 44px; }
	.aa-advantages { grid-template-columns: repeat(2, 1fr); }
	.aa-banner-slash { width: 240px; }
}

@media (max-width: 900px) {
	/* 平板以下：服务区改为单列堆叠 */
	.aa-services-grid {
		grid-template-columns: 1fr;
		grid-template-rows: auto;
	}
	.aa-services-grid > .aa-service-card:nth-child(n) {
		grid-area: auto;
	}
}

@media (max-width: 768px) {
	.aa-banner { height: 400px; }
	.aa-banner-inner { padding: 0 24px; }
	.aa-banner-title { font-size: 32px; letter-spacing: 1px; }
	.aa-banner-title .aa-line { display: inline; }
	.aa-banner-title .aa-line:nth-child(2)::before { content: '\A'; white-space: pre; }
	.aa-banner-subtitle { font-size: 14px; letter-spacing: 4px; }
	.aa-section { padding: 70px 24px; }
	.aa-advantages-section { padding: 70px 24px; }
	.aa-section-title { font-size: 28px; }
	.aa-about { flex-direction: column; gap: 32px; }
	.aa-about-img { width: 100%; flex: none; height: 240px; }
	.aa-about-stats { flex-wrap: wrap; gap: 16px; }
	.aa-stat { flex: 0 0 calc(50% - 8px); }
	.aa-stat + .aa-stat::before { display: none; }
	.aa-advantages { grid-template-columns: 1fr; }
	.aa-banner-slash { width: 140px; left: -60px; }
	.aa-tab { padding: 8px 10px; font-size: 12px; }
}

@media (max-width: 480px) {
	.aa-banner { height: 360px; }
	.aa-banner-title { font-size: 26px; }
	.aa-banner-subtitle { font-size: 13px; letter-spacing: 3px; }
	.aa-banner-subtitle i { display: none; }
	.aa-stat-num { font-size: 26px; }
	.aa-service-card { padding: 28px 22px; }
	.aa-service-card-feature { padding: 24px 20px; }
	.aa-feature-header { flex-direction: column; align-items: flex-start; gap: 12px; }
	.aa-tab-bar { padding: 4px; gap: 4px; }
	.aa-tab { padding: 7px 8px; font-size: 11px; }
	.aa-feature-footer { flex-direction: column; }
	.aa-feature-footer .aa-link-btn,
	.aa-feature-footer .aa-cta-btn { width: 100%; }
	.aa-advantage-card { padding: 36px 20px; }
}