/* ========================================
   广州优氏教育 - 官网样式表
   版本: 2.0
   日期: 2026-07-23
======================================== */

/* CSS 变量定义 */
:root {
    /* 主色调 */
    --color-primary: #FF6B35;
    --color-primary-dark: #E55525;
    --color-primary-light: #FF8B5A;
    --color-secondary: #004E89;
    --color-secondary-dark: #003A66;
    --color-accent: #FFD23F;
    --color-accent-dark: #E5BC2F;

    /* 中性色 */
    --color-text: #2D3436;
    --color-text-light: #636E72;
    --color-text-lighter: #A0A4A8;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8F9FA;
    --color-bg-warm: #FFF5F0;
    --color-border: #E8EAED;

    /* 字体 */
    --font-main: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 999px;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --shadow-primary: 0 4px 20px rgba(255, 107, 53, 0.25);

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* 容器宽度 */
    --container-max: 1200px;
}

/* 重置样式 */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* 容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   通用区块
======================================== */
.section {
    padding: var(--space-xl) 0;
    position: relative;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-lg);
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-primary);
    background: var(--color-bg-warm);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    line-height: 1.2;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ========================================
   按钮
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    font-family: var(--font-main);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(255, 107, 53, 0.35);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
    transform: translateY(-2px);
}

/* ========================================
   导航栏
======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.nav-logo:hover {
    opacity: 0.85;
    transform: scale(1.02);
}

.nav-logo-img {
    height: 44px;
    width: auto;
    object-fit: contain;
}

.logo-icon,
.logo-text,
.logo-sub {
    display: none;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    position: relative;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-bg-warm);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 700;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ========================================
   Hero 首页区域
======================================== */
.hero {
    position: relative;
    min-height: 66vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 70px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 78, 137, 0.82) 0%, rgba(0, 78, 137, 0.6) 50%, rgba(255, 107, 53, 0.72) 100%);
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: #fff;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: var(--space-sm);
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.hero-subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto var(--space-md);
    opacity: 0.9;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-md);
}

.hero-scroll {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   优氏理念
======================================== */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.philosophy-card {
    text-align: center;
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.philosophy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.philosophy-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.philosophy-card:hover::before {
    transform: scaleX(1);
}

.philosophy-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    transition: var(--transition);
}

.philosophy-icon-1 {
    background: linear-gradient(135deg, #FF6B35, #FF8B5A);
    color: #fff;
}

.philosophy-icon-2 {
    background: linear-gradient(135deg, #004E89, #0066B3);
    color: #fff;
}

.philosophy-icon-3 {
    background: linear-gradient(135deg, #FFD23F, #FFE066);
    color: #fff;
}

.philosophy-card:hover .philosophy-icon {
    transform: scale(1.1) rotate(5deg);
}

.philosophy-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.philosophy-card p {
    color: var(--color-text-light);
    line-height: 2;
    font-size: 1rem;
}

/* ========================================
   优氏课程
======================================== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.course-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    position: relative;
    height: 220px;
    overflow: hidden;
    background: var(--color-bg-warm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.course-card:hover .course-image img {
    transform: scale(1.05);
}

.course-number {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 900;
    color: var(--color-primary);
    backdrop-filter: blur(4px);
}

.course-body {
    padding: var(--space-sm) var(--space-sm) var(--space-md);
}

.course-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
    position: relative;
    padding-bottom: 12px;
}

.course-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}

.course-text {
    color: var(--color-text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* ========================================
   优氏服务
======================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.service-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-image {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: #F0F7FF;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.service-card:hover .service-image img {
    transform: scale(1.05);
}

.service-body {
    padding: var(--space-sm);
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
}

.service-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--color-bg-warm);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: var(--color-primary);
    color: #fff;
    transform: rotate(-5deg);
}

.service-content {
    flex: 1;
}

.service-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.service-text {
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ========================================
   关于优氏
======================================== */
.about-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

.about-text {
    margin: var(--space-md) 0;
}

.about-text p {
    color: var(--color-text-light);
    line-height: 2;
    margin-bottom: var(--space-sm);
    font-size: 1rem;
}

.about-stats {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.about-stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 6px;
}

.about-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-visual-img {
    width: 100%;
    max-width: 380px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.about-visual-img:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ========================================
   加入我们
======================================== */
.join-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.join-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
    border-top: 4px solid var(--color-primary);
}

.join-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.join-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.join-card-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.join-tag {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-bg-warm);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

.join-requirements {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.join-requirements li {
    position: relative;
    padding-left: 22px;
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

.join-requirements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
}

/* ========================================
   页脚
======================================== */
.footer {
    background: var(--color-secondary);
    color: rgba(255, 255, 255, 0.85);
    padding: var(--space-lg) 0 var(--space-md);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.footer-logo img {
    height: 52px;
    width: auto;
    object-fit: contain;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col li {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.footer-filing {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-filing a,
.footer-filing span {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-filing a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.footer-filing a:hover {
    color: rgba(255, 255, 255, 0.7);
}

.footer-filing img {
    width: 16px;
    height: 16px;
    display: inline-block;
}

/* ========================================
   回到顶部
======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-primary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
}

/* ========================================
   动画
======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
======================================== */
@media (max-width: 1024px) {
    .courses-grid,
    .services-grid,
    .join-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .philosophy-grid {
        gap: var(--space-sm);
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .about-visual {
        height: 350px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-sm);
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: var(--transition);
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-link {
        padding: 12px 16px;
        width: 100%;
    }

    .nav-link.active::after {
        display: none;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .section {
        padding: var(--space-lg) 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .philosophy-grid,
    .courses-grid,
    .services-grid,
    .join-grid {
        grid-template-columns: 1fr;
    }

    .about-wrapper {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .about-visual {
        height: 300px;
        order: -1;
    }

    .about-stats {
        justify-content: space-around;
    }

    .stat-number {
        font-size: 2rem;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 1.6rem;
    }

    .btn {
        padding: 12px 28px;
        font-size: 0.9rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .about-stats {
        flex-direction: column;
        gap: var(--space-sm);
    }
}