/* 添加 Inter 字体 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0;
    padding: 0;
    overflow-x: hidden;   /* 只隐藏横向溢出，允许纵向滚动 */
    background: linear-gradient(135deg, #0a0416 0%, #1d0627 50%, #2d0b34 100%);
    min-height: 100vh;
    position: relative;
}

.stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.star {
    position: absolute;
    background-color: #fff;
    border-radius: 50%;
    animation: twinkle var(--duration) infinite ease-in-out;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; }
}

.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(186,85,255,0.4) 70%, rgba(131,58,180,0) 100%);
    filter: blur(1px);
    animation: float linear infinite;
}

@keyframes float {
    to {
        transform: translateY(-100vh);
    }
}

.language-switch-btn {
    position: fixed;
    top: 25px;
    right: 180px;  /* 放在登录按钮左侧 */
    z-index: 1001;
    padding: 8px 20px;
    font-size: 16px;
    color: rgba(255, 255, 255, 0.9);
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    border-radius: 18px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-switch-btn:hover {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 400% 400%;
    animation: loginPromptGradientMove 2s linear infinite;
    box-shadow: 0 8px 32px rgba(64,153,255,0.18), 0 6px 20px rgba(0, 0, 0, 0.15);
    color: #fff;
    transform: scale(1.04);
}

.container {
    display: flex;
    max-width: 1200px;
    margin: 200px auto 20px;  /* 增加顶部外边距到200px */
    gap: 30px;               /* 增加左右面板间距 */
    height: calc(100vh - 220px);  /* 调整内容区域高度 */
    position: relative;
    z-index: 2;
    padding: 0 30px;  /* 增加左右内边距 */
    margin-left: calc(16.66% + 20px); /* 左侧控制面板宽度 + 间距 */
    width: calc(83.34% - 40px); /* 剩余宽度减去间距 */
}

.left-control-panel {
    position: fixed;
    left: 0;
    top: 100px; /* Logo下方位置 */
    width: 16.66%; /* 1/6宽度 */
    padding: 20px;
    z-index: 1000;
}

.left-panel, .right-panel {
    flex: 1;
    background: #f5f5f5;
    padding: 35px;  /* 增加内边距到35px */
    border-radius: 12px;
    transition: opacity 0.3s ease;
    display: none;
    margin-top: 30px;  /* 增加顶部外边距到30px */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: calc(50% - 15px); /* 平分剩余空间，考虑间距 */
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;  /* 确保在模态框下面，但在其他内容上面 */
    backdrop-filter: blur(5px);
}

.pricing-modal, .about-modal, .faq-modal {
    z-index: 999;  /* 确保模态框在遮罩层上面 */
}

.btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}

.btn-primary {
    background: #4f46e5;
    color: white;
}

.error-message {
    color: #ef4444;
    font-size: 0.8rem;
    margin-top: 0.25rem;
    display: none;
}

.top-right-login {
    position: fixed;  /* 改为固定定位 */
    top: 25px;       /* 调整顶部位置，与导航栏对齐 */
    right: 50px;     /* 调整右侧边距 */
    z-index: 1001;   /* 确保在最上层 */
    display: flex;
    align-items: center;
}

.login-toggle-btn {
    padding: 8px 20px;
    font-size: 16px;  /* 与导航项字体大小一致 */
    color: rgba(255, 255, 255, 0.9); /* 与导航项颜色一致 */
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 20px;
    font-weight: 500;
    transition: color 0.3s ease;
    min-width: 80px;
}

.login-toggle-btn:hover {
    color: #fff;  /* 与导航项hover状态一致 */
}

/* 用户信息样式 */
.user-info {
    padding: 1.5rem;
    text-align: center;
}

/* 用户菜单样式 */
.user-menu {
    position: fixed;
    top: 25px;
    right: 20px;
    z-index: 1001;
}

.user-menu-content {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    min-width: 200px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 5px;
    z-index: 1000;
    width: 100%;
}

.user-menu.active .user-menu-content {
    display: block;
}

.user-menu-btn {
    width: auto;
    padding: 12px 20px;  /* 增加上下内边距 */
    font-size: 16px;
    cursor: pointer;
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    border-radius: 18px;
    box-shadow: 0 4px 24px rgba(64,153,255,0.10);
    color: rgba(255,255,255,0.9);
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    text-align: center;
    min-width: 80px;
    line-height: 1;  /* 确保文字垂直居中 */
}

.user-menu-btn:hover {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 400% 400%;
    animation: loginPromptGradientMove 2s linear infinite;
    box-shadow: 0 8px 32px rgba(64,153,255,0.18), 0 6px 20px rgba(0, 0, 0, 0.15);
    color: #fff;
    transform: scale(1.04);
}

.user-menu-info {
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e5e7eb;
}

.user-menu-email {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.user-menu-subscription {
    color: #4f46e5;
    font-size: 0.9rem;
}

/* 顶部导航栏样式 */
.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;  /* 添加垂直居中 */
    padding: 25px 0;
    z-index: 1000;
    height: 80px;
    box-sizing: border-box;
}

.nav-menu {
    display: flex;
    gap: 50px;  /* 增加导航项之间的间距 */
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 15px 40px;  /* 增加左右内边距 */
    border-radius: 25px;
    align-items: center;  /* 导航菜单内部元素垂直居中 */
    height: 30px;        /* 固定高度 */
}

.nav-item {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 16px;  /* 增大字体大小 */
    font-weight: 500;
    transition: color 0.3s ease;
    cursor: pointer;
    letter-spacing: 0.5px;  /* 增加字间距 */
}

.nav-item:hover {
    color: #fff;
}

.nav-item.active {
    color: #fff;
    position: relative;
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: #fff;
    border-radius: 1px;
}

/* 修改内容隐藏样式 */
.content-hidden {
    opacity: 0.3;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.login-prompt {
    display: flex;
    align-items: center;
    gap: 12px;
    position: absolute;
    top: 360px;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.9);
    font-size: 24px;
    font-weight: 500;
    padding: 20px 40px;
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    border-radius: 18px;
    box-shadow: 0 4px 24px rgba(64,153,255,0.10);
    z-index: 1;
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s, transform 0.3s;
    margin-bottom: 60px;
}

.login-prompt i {
    font-size: 22px;
}

.login-prompt span {
    font-size: 24px;
}

.login-prompt:hover {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 400% 400%;
    animation: loginPromptGradientMove 2s linear infinite;
    box-shadow: 0 8px 32px rgba(64,153,255,0.18), 0 6px 20px rgba(0, 0, 0, 0.15);
    transform: translate(-50%, -50%) scale(1.04);
}

@keyframes loginPromptGradientMove {
    0% {
        background-position: 0% 50%;
    }
    100% {
        background-position: 100% 50%;
    }
}

/* 广告横幅样式 */
.banner {
    width: 100%;
    padding: 40px 0;
    margin-top: 80px;
    background: none;  /* 移除背景 */
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
}

.banner-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.banner h1 {
    font-size: 2.5em;
    margin-bottom: 15px;
    font-weight: 600;
}

.banner p {
    font-size: 1.2em;
    margin-bottom: 30px;
    opacity: 0.9;
}

.features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 30px;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.feature-item i {
    font-size: 24px;
    color: #fff;
}

.feature-item span {
    font-size: 16px;
}

/* 调整container的margin，为banner留出空间 */
.container {
    margin-top: 50px;
}

/* 登录页面特定样式 */
body.login-page {
    overflow: hidden;
    background: linear-gradient(135deg, #1a0b2e 0%, #2d0b3a 50%, #3d0b45 100%);
}

.university-promotion {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
    background: none;
    backdrop-filter: blur(5px);
    padding: 40px 0;
}

.university-promotion h2 {
    font-size: 3.2em; /* 增大标题文字大小，原来是1.8em */
    margin-bottom: 30px;
}

.logo-carousel {
    width: 100%;
    overflow: hidden;
    position: relative;
    padding: 20px 0;
    background: rgba(255, 255, 255, 0.05);
}

.logo-track {
    display: flex;
    animation: scroll 60s linear infinite;  /* 增加动画时间 */
    width: max-content;
}

.logo-track:hover {
    animation-play-state: paused;
}

.uni-logo {
    height: 100px;
    width: auto;
    margin: 0 30px;
    filter: brightness(0) invert(1);
    opacity: 0.7;
    transition: all 0.3s ease;
    object-fit: contain;
}

.uni-logo:hover {
    opacity: 1;
}

.feature-intro {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 60px 0 40px 0;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.feature-box {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    padding: 32px 24px;
    width: 260px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-box i {
    font-size: 2.5em;
    color: #4f46e5;
    margin-bottom: 18px;
}

.feature-box h3 {
    font-size: 1.2em;
    margin-bottom: 12px;
    color: #222;
}

.feature-box p {
    color: #666;
    font-size: 1em;
    margin: 0;
}

.feature-box:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: 0 8px 24px rgba(0,0,0,0.13);
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-33.33%);  /* 修改为三分之一的距离 */
    }
}

.top-right-login .login-toggle-btn {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    border-radius: 18px;
    box-shadow: 0 4px 24px rgba(64,153,255,0.10);
    color: rgba(255,255,255,0.9);
    font-weight: 500;
    transition: background 0.3s, box-shadow 0.3s, transform 0.3s, color 0.3s;
    min-width: 80px;
    padding: 8px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    outline: none;
}

.top-right-login .login-toggle-btn:hover {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 400% 400%;
    animation: loginPromptGradientMove 2s linear infinite;
    box-shadow: 0 8px 32px rgba(64,153,255,0.18), 0 6px 20px rgba(0, 0, 0, 0.15);
    color: #fff;
    transform: scale(1.04);
}

.top-right-login .control-panel-btn {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    border-radius: 18px;
    box-shadow: 0 4px 24px rgba(64,153,255,0.10);
    color: rgba(255,255,255,0.9);
    font-weight: 500;
    transition: background 0.3s, box-shadow 0.3s, transform 0.3s, color 0.3s;
    min-width: 80px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    outline: none;
}

.top-right-login .control-panel-btn:hover {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 400% 400%;
    animation: loginPromptGradientMove 2s linear infinite;
    box-shadow: 0 8px 32px rgba(64,153,255,0.18), 0 6px 20px rgba(0, 0, 0, 0.15);
    color: #fff;
    transform: scale(1.04);
}

.site-footer {
    width: 100%;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    padding: 24px 0 16px 0;
    background: none;
    letter-spacing: 0.5px;
    margin-top: 40px;
    z-index: 10;
}

.pricing-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(20, 16, 40, 0.92);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.pricing-cards {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.pricing-card {
    background: rgba(20, 16, 40, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 18px;
    box-shadow: 0 8px 32px rgba(64,153,255,0.10);
    padding: 36px 32px 32px 32px;
    width: 280px;
    text-align: center;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.pricing-card.featured {
    border: 2px solid transparent;
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    box-shadow: 0 12px 36px rgba(64,153,255,0.18);
    transform: scale(1.06);
}

.pricing-card.featured h3,
.pricing-card.featured .price,
.pricing-card.featured ul li {
    color: rgba(255, 255, 255, 0.9);
}

.pricing-card.featured .price span {
    color: rgba(255, 255, 255, 0.7);
}

.pricing-card.featured .pricing-btn {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    backdrop-filter: blur(10px);
}

.pricing-card h3 {
    font-size: 1.3em;
    margin-bottom: 18px;
    color: rgba(255, 255, 255, 0.9);
}

.pricing-card .price {
    font-size: 2.2em;
    font-weight: bold;
    margin-bottom: 18px;
    color: rgba(255, 255, 255, 0.9);
}

.pricing-card .price span {
    font-size: 0.5em;
    color: rgba(255, 255, 255, 0.7);
}

.pricing-card ul {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1em;
}

.pricing-card ul li {
    margin-bottom: 10px;
}

.pricing-card .pricing-btn {
    background: linear-gradient(135deg, #4f46e5 0%, #7b1fa2 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 12px 0;
    width: 100%;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pricing-card .pricing-btn:hover {
    background: linear-gradient(135deg, #6366f1 0%, #9333ea 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.pricing-btn {
    background: linear-gradient(135deg, #4f46e5 0%, #7b1fa2 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 12px 0;
    width: 100%;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.pricing-btn:disabled {
    background: #e0e0e0;
    color: #aaa;
    cursor: not-allowed;
}

.close-pricing {
    position: absolute;
    top: 32px;
    right: 48px;
    background: none;
    border: none;
    font-size: 2.2em;
    color: #fff;
    cursor: pointer;
    z-index: 10;
    transition: color 0.2s;
}

.close-pricing:hover {
    color: #4f46e5;
}

.about-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(20, 16, 40, 0.92);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.about-content {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    max-width: 800px;
    width: 90%;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
}

.about-header {
    text-align: center;
    margin-bottom: 40px;
}

.about-header h2 {
    font-size: 2.5em;
    margin-bottom: 10px;
    background: linear-gradient(270deg, #fff 0%, #ccc 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.about-header p {
    font-size: 1.2em;
    color: rgba(255, 255, 255, 0.7);
}

.about-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.about-section {
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
}

.about-section h3 {
    font-size: 1.5em;
    margin-bottom: 15px;
    color: #fff;
}

.about-section p {
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.8);
}

.about-section ul {
    list-style: none;
    padding: 0;
}

.about-section ul li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.about-section ul li i {
    color: #4f46e5;
}

.close-about {
    position: absolute;
    top: 32px;
    right: 48px;
    background: none;
    border: none;
    font-size: 2.2em;
    color: #fff;
    cursor: pointer;
    z-index: 10;
    transition: color 0.2s;
}

.close-about:hover {
    color: #4f46e5;
}

.faq-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(20, 16, 40, 0.92);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.faq-content {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    max-width: 700px;
    width: 90%;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
}

.faq-header {
    text-align: center;
    margin-bottom: 30px;
}

.faq-header h2 {
    font-size: 2.2em;
    margin-bottom: 10px;
    background: linear-gradient(270deg, #fff 0%, #ccc 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.faq-header p {
    font-size: 1.1em;
    color: rgba(255, 255, 255, 0.7);
}

.faq-sections {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item {
    background: rgba(255,255,255,0.07);
    border-radius: 12px;
    margin-bottom: 12px;
    padding: 18px 22px;
    transition: background 0.2s;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.faq-question h3 {
    font-size: 1.1em;
    margin: 0;
    color: #fff;
    font-weight: 500;
}

.faq-answer {
    display: none;
    margin-top: 12px;
    color: rgba(255,255,255,0.85);
    font-size: 1em;
    line-height: 1.7;
}

.faq-item.active {
    background: rgba(79,70,229,0.13);
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-question i {
    font-size: 1.2em;
    color: #4f46e5;
    transition: transform 0.2s;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.close-faq {
    position: absolute;
    top: 32px;
    right: 48px;
    background: none;
    border: none;
    font-size: 2.2em;
    color: #fff;
    cursor: pointer;
    z-index: 10;
    transition: color 0.2s;
}

.close-faq:hover {
    color: #4f46e5;
}

.verification-message {
    text-align: center;
    padding: 2rem;
}

.verification-message i {
    font-size: 3rem;
    color: #4f46e5;
    margin-bottom: 1rem;
}

.verification-message h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.verification-message p {
    color: #666;
    margin-bottom: 0.5rem;
}

.verification-message .note {
    font-size: 0.9rem;
    color: #999;
    margin-top: 1rem;
}

.site-logo-gradient {
    font-family: 'Times-New-Roman', serif;
    font-size: 1.7rem;
    font-weight: bold;
    background: linear-gradient(90deg, #4f8cff 0%, #a259ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /* text-fill-color: transparent; */
    cursor: pointer;
    letter-spacing: 1px;
}

#easytexai-logo {
    position: fixed;
    top: 25px;
    left: 50px;
    z-index: 1001;
}

.use-prompt {
    display: flex;
    align-items: center;
    gap: 12px;
    position: absolute;
    top: 350px;  /* 从280px增加到450px，降低位置 */
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.9);
    font-size: 24px;
    font-weight: 500;
    padding: 20px 40px;
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 200% 200%;
    border-radius: 18px;
    box-shadow: 0 4px 24px rgba(64,153,255,0.10);
    z-index: 1000;  /* 显著增加 z-index 值，确保在所有元素上方 */
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s, transform 0.3s;
    margin-bottom: 120px;
}

.use-prompt i {
    font-size: 22px;
}

.use-prompt span {
    font-size: 24px;
}

.use-prompt:hover {
    background: linear-gradient(270deg, rgba(88,67,254,0.55) 0%, rgba(240,96,226,0.55) 50%, rgba(88,67,254,0.55) 100%);
    background-size: 400% 400%;
    animation: loginPromptGradientMove 2s linear infinite;
    box-shadow: 0 8px 32px rgba(64,153,255,0.18), 0 6px 20px rgba(0, 0, 0, 0.15);
    transform: translate(-50%, -50%) scale(1.04);
}

.demo-video-section {
    width: 100%;
    max-width: 1200px;
    margin: 200px auto 50px; /* 修改顶部边距，从150px增加到200px */
    padding: 0;
    box-sizing: border-box;
    position: relative;
    z-index: 2;
    background: rgba(0, 0, 0, 0.7); /* 降低背景不透明度 */
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    padding: 0px; /* 减少内边距，让视频更贴近边缘 */
}

.demo-video {
    width: 100%;
    border-radius: 8px; /* 稍微减小圆角 */
    display: block; /* 防止底部间隙 */
}

/* 通知样式 */
#notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.notification {
    padding: 15px 20px;
    border-radius: 8px;
    background: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-width: 300px;
    max-width: 400px;
    animation: slideIn 0.3s ease;
}

.notification.success {
    background: #4caf50;
    color: white;
}

.notification.error {
    background: #f44336;
    color: white;
}

.notification .close-notification {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 18px;
    padding: 0;
    opacity: 0.8;
}

.notification .close-notification:hover {
    opacity: 1;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 其他文本元素使用 Inter */
h1, h2, h3, h4, h5, h6, p, span, button, input, label, a {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}