/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --accent-orange: #f97316;
    --bg-cream: #faf8f5;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --white: #ffffff;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-cream);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 1px 4px rgba(0, 0, 0, 0.04);
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(25px);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: 0.8px;
    text-shadow: 0 1px 2px rgba(30, 58, 138, 0.1);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0;
    background: var(--bg-cream);
    border-radius: 16px;
    padding: 0.6rem;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08), 0 2px 12px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.nav-tab {
    text-decoration: none;
    color: var(--text-gray);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.85rem 1.8rem;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    letter-spacing: 0.3px;
}

.nav-tab:hover {
    color: var(--primary-blue);
    background: rgba(30, 58, 138, 0.08);
    transform: translateY(-1px);
}

.nav-tab.active {
    color: var(--primary-blue);
    background: var(--white);
    box-shadow: 0 4px 16px rgba(30, 58, 138, 0.15), 0 2px 8px rgba(0, 0, 0, 0.08);
    font-weight: 600;
    transform: translateY(-1px);
}

/* 下拉菜单样式 */
.nav-dropdown {
    position: relative !important;
}

.dropdown-toggle {
    cursor: pointer !important;
}

.dropdown-menu {
    position: absolute !important;
    top: 100% !important;
    left: 0 !important;
    background: var(--white) !important;
    border-radius: 16px !important;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12), 0 4px 16px rgba(0, 0, 0, 0.08) !important;
    list-style: none !important;
    min-width: 240px !important;
    padding: 1rem 0 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transform: translateY(-15px) scale(0.95) !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    z-index: 1000 !important;
    margin-top: 0.8rem !important;
    border: 1px solid rgba(0, 0, 0, 0.05) !important;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) scale(1) !important;
}

/* 强制显示下拉菜单的悬停效果 */
.nav-dropdown:hover .dropdown-menu {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) scale(1) !important;
}

/* 点击显示下拉菜单的样式 */
.dropdown-menu.active {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) scale(1) !important;
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.9rem 1.8rem;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.9rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    margin: 0 0.75rem;
    letter-spacing: 0.2px;
}

.dropdown-menu a:hover {
    background: rgba(30, 58, 138, 0.06);
    color: var(--primary-blue);
    transform: translateX(4px);
}

/* 待上线标签样式 */
.coming-soon {
    position: relative;
}

.badge {
    background: linear-gradient(135deg, var(--accent-orange), #ff7c3f);
    color: var(--white);
    font-size: 0.65rem;
    padding: 0.25rem 0.6rem;
    border-radius: 14px;
    font-weight: 600;
    margin-left: 0.5rem;
    box-shadow: 0 2px 6px rgba(249, 115, 22, 0.3);
    letter-spacing: 0.3px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 3px;
}

/* 英雄区 */
.hero {
    padding: 160px 2rem 100px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    min-height: 700px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 6rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    animation: fadeInLeft 1s ease;
    padding-right: 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    line-height: 1.1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    font-weight: 300;
}

.cta-button {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: var(--accent-orange);
    color: var(--white);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.4);
    position: relative;
    overflow: hidden;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.5);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 1s ease;
    position: relative;
}

.image-placeholder {
    width: 350px;
    height: 350px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(15px);
    border: 4px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1), inset 0 2px 10px rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.placeholder-icon {
    font-size: 7rem;
    margin-bottom: 1.2rem;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
    animation: float 3s ease-in-out infinite;
}

.hero-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-bottom: 1.2rem;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
    animation: float 3s ease-in-out infinite;
}

.image-placeholder p {
    font-size: 1.8rem;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    letter-spacing: 1px;
}

/* 通用区块样式 */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    text-align: center;
    margin-bottom: 3rem;
}

/* 关于Koma版块 */
.about-section {
    background: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.about-item {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.about-item:nth-child(1) { animation-delay: 0.1s; }
.about-item:nth-child(2) { animation-delay: 0.2s; }
.about-item:nth-child(3) { animation-delay: 0.3s; }
.about-item:nth-child(4) { animation-delay: 0.4s; }
.about-item:nth-child(5) { animation-delay: 0.5s; }

.about-item h3 {
    font-size: 1.2rem;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.about-item p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 0.3rem;
}

.about-item .highlight {
    color: var(--accent-orange);
    font-weight: 600;
}

.about-item .description {
    font-style: italic;
    font-size: 0.95rem;
}

.about-certificates {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.certificate-card {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    color: var(--white);
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.2);
    transition: transform 0.3s ease;
}

.certificate-card:hover {
    transform: translateY(-5px);
}

.cert-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.certificate-card h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.certificate-card p {
    opacity: 0.9;
}

/* 教学特色亮点 */
.features-section {
    background: var(--bg-cream);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.7;
}

/* 课程区域 */
.courses-section {
    background: var(--white);
}

.courses-placeholder {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-cream);
    border-radius: 15px;
    color: var(--text-gray);
    font-size: 1.2rem;
}

/* 合作联系区 */
.contact-section {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: var(--white);
}

.contact-content {
    text-align: center;
    padding: 2rem 0;
}

.contact-info {
    font-size: 1.3rem;
    margin-bottom: 2rem;
}

.contact-id {
    font-weight: 600;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1.5rem;
    border-radius: 30px;
    margin-left: 1rem;
}

.contact-button {
    padding: 1rem 3rem;
    background: var(--accent-orange);
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
}

.contact-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.5);
}

/* 页脚 */
.footer {
    background: var(--primary-blue);
    color: var(--white);
    padding: 3rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-slogan {
    opacity: 0.8;
    margin-bottom: 2rem;
    font-weight: 300;
}

    .footer-info p {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 页脚中的隐蔽管理员按钮 */
.footer-admin-btn {
    position: absolute;
    top: 60%;
    right: 10px;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    text-decoration: none;
    transition: all 0.3s ease;
    opacity: 0.6;
}

.footer-admin-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
    opacity: 1;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.footer-admin-btn .admin-icon {
    font-size: 1rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-admin-btn:hover .admin-icon {
    opacity: 1;
}

/* 调整页脚品牌区域，为管理员按钮留出空间 */
.footer-brand {
    position: relative;
    padding-right: 60px;
}

/* 动画 */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 响应式设计 */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 4rem;
        text-align: center;
    }

    .hero-content {
        padding-right: 0;
    }

    .hero-image {
        order: -1;
    }

    .image-placeholder {
        width: 280px;
        height: 280px;
    }

    .placeholder-icon {
        font-size: 5.5rem;
    }

    .hero-logo {
        width: 100px;
        height: 100px;
    }

    .hero-title {
        font-size: 2.8rem;
        margin-bottom: 2rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        gap: 0.5rem;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        border-radius: 0;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .nav-tab {
        padding: 1.1rem 1.2rem;
        border-radius: 12px;
        margin-bottom: 0.3rem;
        justify-content: space-between;
        font-size: 1rem;
        font-weight: 500;
    }

    .nav-tab.active {
        background: linear-gradient(135deg, var(--primary-blue), #3b82f6);
        color: var(--white);
        box-shadow: 0 4px 12px rgba(30, 58, 138, 0.3);
    }

    .nav-tab:hover {
        background: var(--bg-cream);
        color: var(--text-dark);
        transform: translateX(4px);
    }

    /* 移动端下拉菜单样式 */
    .nav-dropdown {
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        background: var(--bg-cream);
        border-radius: 8px;
        padding: 0.5rem;
        margin-top: 0.5rem;
        min-width: auto;
    }

    .dropdown-menu a {
        padding: 0.9rem 1.2rem;
        margin: 0.3rem 0;
        border-radius: 10px;
        font-size: 0.95rem;
        justify-content: space-between;
        font-weight: 500;
    }

    .dropdown-menu a:hover {
        background: rgba(30, 58, 138, 0.08);
        transform: translateX(6px);
    }

    .badge {
        font-size: 0.6rem;
        padding: 0.2rem 0.5rem;
        margin-left: 0;
    }

    .hero {
        padding: 140px 1.5rem 80px;
        min-height: 600px;
    }

    .hero-title {
        font-size: 2.2rem;
        margin-bottom: 1.8rem;
    }

    .image-placeholder {
        width: 240px;
        height: 240px;
    }

    .placeholder-icon {
        font-size: 4.5rem;
    }

    .hero-logo {
        width: 90px;
        height: 90px;
    }

    .image-placeholder p {
        font-size: 1.4rem;
    }

    .cta-button {
        padding: 1rem 2.5rem;
        font-size: 1.1rem;
    }

    .section-container {
        padding: 3rem 1.5rem;
    }

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

    .contact-info {
        font-size: 1.1rem;
    }

    .contact-id {
        display: block;
        margin: 1rem 0;
    }

    /* 移动端页脚管理员按钮 */
    .footer-admin-btn {
        width: 35px;
        height: 35px;
        right: 8px;
        top: 65%;
    }

    .footer-admin-btn .admin-icon {
        font-size: 0.9rem;
    }

    .footer-brand {
        padding-right: 50px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }

    .image-placeholder {
        width: 200px;
        height: 200px;
    }

    .placeholder-icon {
        font-size: 3.5rem;
    }

    .hero-logo {
        width: 80px;
        height: 80px;
    }

    .image-placeholder p {
        font-size: 1.2rem;
    }

    .cta-button {
        padding: 0.9rem 2.2rem;
        font-size: 1rem;
    }

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

    .feature-card {
        padding: 2rem 1.5rem;
    }

    .image-placeholder {
        width: 200px;
        height: 200px;
    }

    .placeholder-icon {
        font-size: 4rem;
    }
}