:root {
	--primary-color: #003366; /* ����ɫ����ѧ���Ͻ� */
	--secondary-color: #D4AF37; /* ��ɫ������ש���� */
	--accent-color: #E63946; /* ��ɫ���ӻ��� */
	--light-color: #F8F9FA;
	--dark-color: #212529;
	--brics-blue: #1A73E8;
	--brics-green: #34A853;
	--brics-yellow: #FBBC05;
	--brics-red: #EA4335;
}

body {
	font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
	line-height: 1.6;
	color: var(--dark-color);
	margin: 0;
	padding: 0;
	background-color: var(--light-color);
}

.container {
	width: 85%;
	max-width: 1200px;
	margin: 0 auto;
}

/* ������ */
header {
	background-color: var(--primary-color);
	color: white;
	padding: 1rem 0;
	box-shadow: 0 2px 5px rgba(0,0,0,0.1);
	position: sticky;
	top: 0;
	z-index: 100;
}

nav {
	display: flex;
	justify-content: space-between;
	align-items: center;
}

.logo {
	font-size: 1.8rem;
	font-weight: 700;
	display: flex;
	align-items: center;
}

.logo img {
	height: 50px;
	margin-right: -50px;
}

.logo span {
	color: var(--secondary-color);
}

.nav-links {
	display: flex;
	list-style: none;
}

.nav-links li {
	margin-left: 1.5rem;
	position: relative;
}

.nav-links a {
	color: white;
	text-decoration: none;
	font-weight: 500;
	transition: color 0.3s;
	display: flex;
	align-items: center;
	white-space: nowrap;
}

.nav-links a i {
	margin-right: 5px;
}

.nav-links a:hover {
	color: var(--secondary-color);
}

.language-switcher {
	margin-left: 2rem;
}

.language-switcher button {
	background: none;
	border: none;
	color: white;
	cursor: pointer;
	padding: 5px 10px;
	border-radius: 3px;
	transition: background 0.3s;
	white-space: nowrap;
}

.language-switcher button.active {
	background: rgba(255,255,255,0.2);
}

.language-switcher button:hover {
	background: rgba(255,255,255,0.1);
}

/* Ӣ������ */
.hero {
	background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1635070041078-e363dbe005cb?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
	background-size: cover;
	background-position: center;
	color: white;
	text-align: center;
	padding: 6rem 0;
}

.hero h1 {
	font-size: 3rem;
	margin-bottom: 1rem;
}

.hero .subtitle {
	font-size: 1.5rem;
	margin-bottom: 1.5rem;
	color: var(--secondary-color);
}

.hero p {
	font-size: 1.2rem;
	max-width: 800px;
	margin: 0 auto 2rem;
}

.btn {
	display: inline-block;
	background: var(--secondary-color);
	color: var(--primary-color);
	padding: 0.8rem 1.8rem;
	border: none;
	border-radius: 5px;
	text-decoration: none;
	font-weight: 600;
	transition: all 0.3s;
	margin: 0.5rem;
}

.btn:hover {
	background: #F0C14B;
	transform: translateY(-2px);
	box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-outline {
	background: transparent;
	border: 2px solid var(--secondary-color);
}

.btn-outline:hover {
	background: var(--secondary-color);
	color: var(--primary-color);
}

/* BRICS���ұ�־ */
.brics-flags {
	display: flex;
	justify-content: center;
	margin: 2rem 0;
}

.brics-flag {
	width: 60px;
	height: 40px;
	margin: 0 10px;
	border-radius: 4px;
	box-shadow: 0 2px 5px rgba(0,0,0,0.2);
	transition: transform 0.3s;
}

.brics-flag:hover {
	transform: scale(1.1);
}

/* ��Ҫ���� */
.main-content {
	padding: 4rem 0;
}

section {
	margin-bottom: 4rem;
}

h2 {
	color: var(--primary-color);
	font-size: 2rem;
	margin-bottom: 1.5rem;
	position: relative;
	padding-bottom: 0.5rem;
	text-align: center;
}

h2::after {
	content: '';
	position: absolute;
	bottom: 0;
	left: 50%;
	transform: translateX(-50%);
	width: 80px;
	height: 3px;
	background: var(--secondary-color);
}

h3 {
	color: var(--primary-color);
	font-size: 1.5rem;
	margin-bottom: 1rem;
}

/* ��Ҫ���� */
.important-dates {
	background: white;
	padding: 2rem;
	border-radius: 5px;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.date-item {
	display: flex;
	margin-bottom: 1rem;
	padding-bottom: 1rem;
	border-bottom: 1px solid #eee;
}

.date-item:last-child {
	border-bottom: none;
}

.date {
	font-weight: 700;
	color: var(--secondary-color);
	min-width: 180px;
}

/* �ݽ��� */
.speakers {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
	gap: 2rem;
}

.speaker-card {
	background: white;
	border-radius: 5px;
	overflow: hidden;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
	transition: all 0.3s;
}

.speaker-card:hover {
	transform: translateY(-5px);
	box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.speaker-img {
	height: 250px;
	background-size: cover;
	background-position: center;
	position: relative;
}

.speaker-country {
	position: absolute;
	top: 10px;
	right: 10px;
	width: 30px;
	height: 20px;
	border-radius: 3px;
	box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.speaker-info {
	padding: 1.5rem;
}

.speaker-name {
	font-size: 1.3rem;
	margin-bottom: 0.5rem;
	color: var(--primary-color);
}

.speaker-title {
	color: var(--secondary-color);
	font-style: italic;
	margin-bottom: 1rem;
}

/* �������� */
.topics-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
	gap: 1.5rem;
}

.topic-card {
	background: white;
	padding: 1.5rem;
	border-radius: 5px;
	box-shadow: 0 2px 5px rgba(0,0,0,0.1);
	transition: all 0.3s;
}

.topic-card:hover {
	transform: translateY(-5px);
	box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.topic-card h4 {
	color: var(--primary-color);
	margin-bottom: 1rem;
	display: flex;
	align-items: center;
}

.topic-card h4 i {
	margin-right: 10px;
	color: var(--secondary-color);
}

.topic-card ul {
	padding-left: 1.5rem;
}

.topic-card li {
	margin-bottom: 0.5rem;
}

/* ע����Ϣ */
.registration-info {
	background: white;
	padding: 2rem;
	border-radius: 5px;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

table {
	width: 100%;
	border-collapse: collapse;
	margin: 1.5rem 0;
}

th, td {
	padding: 12px 15px;
	text-align: left;
	border-bottom: 1px solid #ddd;
}

th {
	background-color: var(--primary-color);
	color: white;
}

tr:nth-child(even) {
	background-color: #f2f2f2;
}

tr:hover {
	background-color: #f5f5f5;
}

/* ��ϵ��ʽ�ͻ����ַ */
.contact-address-section {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 2rem;
	margin-bottom: 3rem;
}

.contact-info, .venue-info {
	background: white;
	padding: 2rem;
	border-radius: 5px;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.contact-info h3, .venue-info h3 {
	color: var(--primary-color);
	margin-bottom: 1.5rem;
	font-size: 1.5rem;
}

.contact-details p, .venue-details p {
	margin-bottom: 1rem;
	display: flex;
	align-items: flex-start;
}

.contact-details i, .venue-details i {
	margin-right: 1rem;
	color: var(--secondary-color);
	min-width: 20px;
}

.map-container {
	height: 300px;
	margin-top: 1.5rem;
	border-radius: 5px;
	overflow: hidden;
}

/* ҳ�� */
footer {
	background: var(--dark-color);
	color: white;
	padding: 3rem 0;
	text-align: center;
}

.footer-content {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
	gap: 2rem;
	text-align: left;
	margin-bottom: 2rem;
}

.footer-column h4 {
	color: var(--secondary-color);
	margin-bottom: 1.5rem;
	font-size: 1.2rem;
}

.footer-links {
	list-style: none;
	padding: 0;
}

.footer-links li {
	margin-bottom: 0.8rem;
}

.footer-links a {
	color: white;
	text-decoration: none;
	transition: color 0.3s;
}

.footer-links a:hover {
	color: var(--secondary-color);
}

.social-links {
	display: flex;
	gap: 1rem;
}

.social-links a {
	color: white;
	font-size: 1.5rem;
	transition: color 0.3s;
}

.social-links a:hover {
	color: var(--secondary-color);
}

.copyright {
	opacity: 0.8;
	font-size: 0.9rem;
	padding-top: 1.5rem;
	border-top: 1px solid rgba(255,255,255,0.1);
}

/* BRICS��ɫչʾ */
.brics-colors {
	display: flex;
	margin: 1rem 0;
}

.brics-color {
	height: 10px;
	flex: 1;
}

.color-blue { background: var(--brics-blue); }
.color-green { background: var(--brics-green); }
.color-yellow { background: var(--brics-yellow); }
.color-red { background: var(--brics-red); }

/* ��Ӧʽ��� */
@media (max-width: 768px) {
	.nav-links {
		display: none;
	}
	
	.hero h1 {
		font-size: 2.2rem;
	}
	
	.hero .subtitle {
		font-size: 1.2rem;
	}
	
	.speakers, .topics-grid {
		grid-template-columns: 1fr;
	}
	
	.contact-address-section {
		grid-template-columns: 1fr;
	}
	
	.footer-content {
		grid-template-columns: 1fr;
		text-align: center;
	}
	
	.social-links {
		justify-content: center;
	}
}

/* ίԱ����ʽ */
#committees {
	margin-bottom: 4rem;
}

.committee-section {
	background: white;
	padding: 2rem;
	border-radius: 5px;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
	margin-bottom: 2rem;
}

.committee-section h3 {
	color: var(--primary-color);
	font-size: 1.5rem;
	margin-bottom: 1.5rem;
	text-align: center;
	padding-bottom: 0.5rem;
	border-bottom: 2px solid var(--secondary-color);
}

.country-group {
	margin-bottom: 1.5rem;
}

.country-group h4 {
	color: var(--primary-color);
	display: flex;
	align-items: center;
	margin-bottom: 0.8rem;
	font-size: 1.2rem;
}

.committee-flag {
	width: 30px;
	height: 20px;
	margin-right: 10px;
	border-radius: 3px;
}

.committee-members {
	list-style-type: none;
	padding-left: 40px;
}

.committee-members li {
	margin-bottom: 0.8rem;
	position: relative;
	line-height: 1.5;
}

.committee-members li:before {
	content: "";
	color: var(--secondary-color);
	font-weight: bold;
	display: inline-block;
	width: 1em;
	margin-left: -1em;
	position: absolute;
	left: 0;
}

@media (max-width: 768px) {
	.committee-members {
		padding-left: 25px;
	}
}

/* �ճ̱���ʽ */
#program {
	margin-bottom: 4rem;
}

.schedule-container {
	margin-top: 2rem;
}

.day-schedule {
	background: white;
	padding: 2rem;
	border-radius: 5px;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
	margin-bottom: 2rem;
}

.day-schedule h3 {
	color: var(--primary-color);
	font-size: 1.5rem;
	margin-bottom: 1.5rem;
	text-align: center;
	padding-bottom: 0.5rem;
	border-bottom: 2px solid var(--secondary-color);
}

.schedule-table {
	overflow-x: auto;
}

.schedule-table table {
	width: 100%;
	border-collapse: collapse;
	margin: 0;
}

.schedule-table th {
	background-color: var(--primary-color);
	color: white;
	padding: 12px 15px;
	text-align: left;
}

.schedule-table td {
	padding: 12px 15px;
	border-bottom: 1px solid #eee;
	vertical-align: top;
}

.schedule-table tr:nth-child(even) {
	background-color: #f9f9f9;
}

.schedule-table tr:hover {
	background-color: #f5f5f5;
}

.schedule-table .highlight {
	background-color: rgba(212, 175, 55, 0.1);
}

.schedule-table .highlight td {
	border-bottom: 1px solid var(--secondary-color);
}

.schedule-table .special-event {
	background-color: rgba(230, 57, 70, 0.05);
	font-style: italic;
}

.schedule-table .special-event td {
	border-bottom: 1px solid rgba(230, 57, 70, 0.3);
}

@media (max-width: 768px) {
	.day-schedule {
		padding: 1rem;
	}
	
	.schedule-table th, 
	.schedule-table td {
		padding: 8px 10px;
		font-size: 0.9rem;
	}
}