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

/* 防止图片被拖动和保存 */
img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

/* 允许按钮等交互元素的指针事件 */
button, a, input, textarea, select {
    pointer-events: auto;
}

:root {
    --primary: rgba(0, 150, 255, 0.9);
    --secondary: rgba(0, 100, 200, 0.7);
    --success: rgba(0, 255, 200, 0.9);
    --danger: rgba(255, 50, 100, 0.9);
    --warning: rgba(255, 200, 0, 0.9);
    --cyan: rgba(0, 212, 255, 0.9);
    --dark: rgba(5, 15, 30, 0.95);
    --dark-light: rgba(10, 25, 50, 0.9);
    --dark-medium: rgba(15, 35, 70, 0.85);
    --light: rgba(255, 255, 255, 0.95);
    --gray: rgba(255, 255, 255, 0.85);
    --gradient: linear-gradient(135deg, rgba(0, 150, 255, 0.9), rgba(0, 212, 255, 0.7));
    --glass-bg: rgba(10, 25, 50, 0.65);
    --glass-border: rgba(0, 212, 255, 0.25);
    --glass-shadow: 0 8px 32px rgba(0, 150, 255, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, rgba(5, 15, 30, 0.98) 0%, rgba(10, 30, 60, 0.98) 50%, rgba(5, 15, 30, 0.98) 100%);
    background-image: url('../img/bg.png'), radial-gradient(ellipse at 20% 50%, rgba(0, 150, 255, 0.08) 0%, transparent 50%), radial-gradient(ellipse at 80% 50%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    background-size: 100% 100%, 100% 100%, 100% 100%;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    color: var(--light);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== 页面头部 ===== */
.page-header {
    background-image: url('../img/head.png');
    background-size: 100% 100%;
    background-position: center top;
    background-repeat: no-repeat;
    padding: 0.5rem;
    text-align: center;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.page-header h1 {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--light);
    text-shadow: none;
    letter-spacing: 4px;
    margin: 0;
}

/* ===== 章节头部 ===== */
.section-header {
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header .page-subtitle {
    color: var(--gray);
}

/* ===== 页面导航 ===== */
.page-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.nav-link {
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(0, 150, 255, 0.3);
    color: var(--light);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: 0 4px 15px rgba(0, 150, 255, 0.2);
}

.nav-link.admin-link {
    border-color: var(--secondary);
}

.nav-link.admin-link:hover {
    background: var(--secondary);
}

.nav-link.logout-link {
    border-color: var(--danger);
}

.nav-link.logout-link:hover {
    background: var(--danger);
}

.welcome-banner {
    font-size: 3rem;
    font-weight: bold;
    color: var(--light);
    text-shadow: none;
    letter-spacing: 2px;
    margin: 0;
}

/* ===== 主容器 ===== */
html, body {
    height: 100%;
    overflow: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.main-content {
    min-height: calc(100vh - 200px);
    padding-bottom: 3rem;
    padding-top: 70px;
}

.dashboard {
    height: 100vh;
    overflow: hidden;
}

/* ===== 顶部内容区域 ===== */
.top-content {
    position: relative;
    margin-bottom: 2rem;
    padding-right: 300px;
    min-height: 450px;
    display: flex;
    flex-direction: column;
}

.right-panel {
    position: absolute;
    right: 45px;
    top: 0;
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ===== 公告区域 ===== */
.announcement-section {
    margin-left: 300px;
    margin-right: 50px;
    margin-bottom: 13rem;
    max-width: none;
    min-height: 440px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    text-align: left;
}

/* ===== 快捷按钮 ===== */
.quick-buttons-fixed {
    position: fixed;
    bottom: 11rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 3rem;
    z-index: 999;
}

/* ===== 用户信息卡片 ===== */
.user-info-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.2rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.user-avatar {
    text-align: center;
    margin-bottom: 1rem;
}

.user-avatar i {
    font-size: 4rem;
    color: var(--gradient);
}

.user-avatar.admin-avatar {
    cursor: pointer;
}

.user-details h3 {
    text-align: center;
    color: var(--light);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.user-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--light);
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

.stat-item i {
    color: var(--cyan);
}

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.6rem 1rem;
    background: rgba(255, 50, 100, 0.2);
    border: 1px solid rgba(255, 50, 100, 0.4);
    border-radius: 10px;
    color: rgba(255, 100, 120, 0.95);
    text-decoration: none;
}

.logout-btn:hover {
    background: rgba(255, 50, 100, 0.4);
    border-color: rgba(255, 50, 100, 0.6);
}

.logout-btn i {
    font-size: 0.9rem;
}

.logout-btn span {
    font-size: 0.9rem;
}

/* ===== 倒计时卡片 ===== */
.countdown-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.2rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.countdown-card.ended {
    /* 移除红色样式，保持原有颜色 */
}

.countdown-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.9rem;
    color: var(--light);
    font-size: 0.9rem;
}

.countdown-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.time-block {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.85rem;
}

.time-value {
    font-size: 1rem;
    font-weight: bold;
    color: var(--cyan);
    background: rgba(7, 57, 121, 0.2);
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
    min-width: 45px;
    text-align: center;
    border: 1px solid rgba(0, 59, 169, 0.25);
}

.time-separator {
    color: var(--gray);
    font-size: 0.85rem;
}

.announcement-section h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--light);
    font-size: 1.5rem;
}

.announcement-content {
    color: var(--light);
    line-height: 1.8;
    max-height: 340px;
    overflow-y: auto;
    padding-right: 10px;
}

.announcement-text {
    font-size: 1.3rem;
}

/* ===== 快捷按钮 ===== */
.quick-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.quick-btn {
    display: flex;
    align-items: center;
    padding: 0.6rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    min-width: 120px;
    justify-content: center;
}

.quick-btn span {
    font-size: 0.9rem;
    font-weight: 500;
}

.quick-btn.theory-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--light);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.quick-btn.theory-btn:hover {
    background: rgba(10, 25, 50, 0.85);
    color: var(--light);
    border-color: rgba(0, 212, 255, 0.5);
}

.quick-btn.practice-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--light);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.quick-btn.practice-btn:hover {
    background: rgba(10, 25, 50, 0.85);
    color: var(--light);
    border-color: rgba(0, 212, 255, 0.5);
}

/* ===== 登录页面 ===== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding-top: 60px;
    width: 100%;
    overflow: hidden;
}

.login-page .page-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    min-height: 60px;
    padding: 0.5rem;
    background-color: transparent;
    background-size: 100% 100%;
    background-position: center top;
    background-repeat: no-repeat;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-page .page-header h1 {
    font-size: 1.8rem;
}

.particles {
    display: none;
}

.particle {
    display: none;
}



    50% {
        opacity: 0.2;
    }
}

.login-container {
    display: flex;
    gap: 3rem;
    align-items: center;
    z-index: 1;
    padding: 2rem;
}

.login-box {
    background: rgba(5, 30, 60, 0.65);
    backdrop-filter: blur(20px);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 50, 100, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 150, 255, 0.15);
    width: 400px;
    position: relative;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header i {
    font-size: 4rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}

.login-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-header h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}

.login-header p {
    color: var(--gray);
    font-size: 0.9rem;
}

.login-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.login-icon i {
    font-size: 3.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-subtitle {
    color: var(--gray);
    font-size: 0.95rem;
    margin-top: -0.5rem;
    margin-bottom: 0;
}

.login-form .form-group label {
    display: block;
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.login-error {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255, 50, 100, 0.95);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 50, 100, 0.1);
    border: 1px solid rgba(255, 50, 100, 0.3);
    border-radius: 4px;
}

.login-error .error-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: rgba(255, 50, 100, 0.3);
    border-radius: 50%;
    font-weight: bold;
    font-size: 0.9rem;
}

.login-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.login-footer p {
    color: var(--gray);
    font-size: 0.9rem;
}

.login-btn {
    width: 100%;
    padding: 0.85rem;
    background: linear-gradient(135deg, rgba(0, 150, 255, 0.9), rgba(0, 212, 255, 0.7));
    border: none;
    border-radius: 12px;
    color: var(--light);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.login-btn:hover {
    background: linear-gradient(135deg, rgba(0, 180, 255, 0.9), rgba(0, 230, 255, 0.8));
}

.login-btn .btn-arrow {
    font-size: 1.2rem;
    font-weight: bold;
}

.login-form .form-group {
    margin-bottom: 1.5rem;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
    background: rgba(15, 35, 70, 0.8);
    border-radius: 10px;
    border: 2px solid transparent;
}

.input-group:focus-within {
    border-color: rgba(0, 212, 255, 0.8);
}

.input-group .input-icon {
    padding: 1rem 1rem 1rem 1.5rem;
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 500;
}

.input-group input {
    background: transparent;
    border: none;
    color: var(--light);
    padding: 1rem;
    width: 100%;
    font-size: 1rem;
    outline: none;
}

.login-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--gradient);
    border: none;
    border-radius: 4px;
    color: var(--light);
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.login-error {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255, 50, 100, 0.95);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    z-index: 10;
}

.login-info {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--gray);
    font-size: 0.85rem;
}

.login-decoration {
    position: relative;
}

.cyber-circle {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(0, 212, 255, 0.4);
}

.cyber-circle:nth-child(1) {
    width: 300px;
    height: 300px;
    top: -50px;
    left: -50px;
}

.cyber-circle:nth-child(2) {
    width: 250px;
    height: 250px;
    top: -25px;
    left: -25px;
}

.cyber-circle:nth-child(3) {
    width: 200px;
    height: 200px;
    top: 0;
    left: 0;
}



    50% {
        opacity: 0.6;
    }
}

.welcome-banner {

    .banner-content .subtitle {
        color: rgba(255, 255, 255, 0.8);
    }

    .banner-stats {
        display: flex;
        gap: 3rem;
        margin-top: 2rem;
    }

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

    .stat-item i {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }

    .stat-value {
        font-size: 2.5rem;
        font-weight: bold;
        display: block;
    }

    .stat-label {
        color: rgba(255, 255, 255, 0.8);
        font-size: 0.9rem;
    }

    /* 快速入口 */
    .quick-access {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .access-card {
        background: var(--glass-bg);
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        padding: 2rem;
        border-radius: 16px;
        text-decoration: none;
        color: var(--light);
        border: 1px solid var(--glass-border);
        box-shadow: var(--glass-shadow);
        position: relative;
        overflow: hidden;
    }

    .access-card:hover {
        background: rgba(10, 25, 50, 0.8);
        border-color: rgba(0, 212, 255, 0.5);
    }

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

    .access-card.theory .card-icon {
        color: rgba(0, 212, 255, 0.9);
    }

    .access-card.practice .card-icon {
        color: rgba(0, 150, 255, 0.9);
    }

    .access-card.leaderboard .card-icon {
        color: rgba(255, 200, 0, 0.9);
    }

    .access-card h3 {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }

    .access-card p {
        color: var(--gray);
    }

    .access-card .card-arrow {
        position: absolute;
        top: 1.5rem;
        right: 1.5rem;
        font-size: 1.5rem;
        color: var(--gray);
    }

    .access-card:hover .card-arrow {
        color: var(--primary);
    }

    /* 最新动态 */
    .recent-activity {
        background: rgba(10, 25, 50, 0.85);
        backdrop-filter: blur(10px);
        padding: 2rem;
        border-radius: 8px;
        margin-bottom: 2rem;
        border: 1px solid rgba(0, 212, 255, 0.2);
    }

    .recent-activity h2 {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        margin-bottom: 1.5rem;
    }

    .activity-list {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

    .activity-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 1rem;
        background: var(--dark-medium);
        border-radius: 6px;
    }

    .activity-user {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-weight: 500;
    }

    .activity-user i {
        color: var(--primary);
    }

    .activity-content {
        flex: 1;
        margin: 0 2rem;
        color: var(--gray);
    }

    .activity-content .challenge-name {
        color: var(--primary);
        font-weight: 500;
    }

    .activity-time {
        color: var(--gray);
        font-size: 0.85rem;
    }

    .no-data {
        text-align: center;
        color: var(--gray);
        padding: 2rem;
    }

    /* 进度条 */
    .progress-section {
        background: rgba(10, 25, 50, 0.85);
        backdrop-filter: blur(10px);
        padding: 2rem;
        border-radius: 8px;
        border: 1px solid rgba(0, 212, 255, 0.2);
    }

    .progress-section h2 {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        margin-bottom: 1.5rem;
    }

    .progress-bar-container {
        display: flex;
        align-items: center;
        gap: 1rem;
    }

    .progress-bar {
        flex: 1;
        height: 30px;
        background: rgba(15, 35, 70, 0.8);
        border-radius: 8px;
        overflow: hidden;
    }

    .progress-fill {
        height: 100%;
        background: linear-gradient(135deg, rgba(0, 150, 255, 0.9), rgba(0, 212, 255, 0.7));
        display: flex;
        align-items: center;
        justify-content: flex-end;
        padding-right: 1rem;
        font-weight: bold;
    }

    .progress-text {
        color: var(--gray);
        min-width: 150px;
    }

    /* ===== 理论题/CTF页面 ===== */
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

/* ===== 页面导航 ===== */
.page-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.nav-link {
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(0, 150, 255, 0.3);
    color: var(--light);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: 0 4px 15px rgba(0, 150, 255, 0.2);
}

.nav-link.admin-link {
    border-color: var(--secondary);
}

.nav-link.admin-link:hover {
    background: var(--secondary);
}

.nav-link.logout-link {
    border-color: var(--danger);
}

.nav-link.logout-link:hover {
    background: var(--danger);
}

.welcome-banner {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-subtitle {
    color: var(--gray);
}

.back-btn {
    color: var(--gray);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.back-btn:hover {
    color: var(--cyan);
}

/* 分类标签 */
.category-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--light);
    cursor: pointer;
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--gradient);
    color: var(--light);
    border-color: transparent;
}

/* 题目卡片 */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.challenge-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.challenge-card:hover {
    background: rgba(10, 25, 50, 0.8);
    border-color: rgba(0, 212, 255, 0.5);
}

.challenge-card.solved {
    border-color: var(--success);
    opacity: 0.7;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--dark-medium);
}

.category-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--gradient);
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.category-tag.Web安全 {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.8), rgba(139, 92, 246, 0.8));
}

.category-tag.密码学 {
    background: linear-gradient(135deg, rgba(0, 200, 150, 0.8), rgba(59, 130, 246, 0.8));
}

.category-tag.逆向工程 {
    background: linear-gradient(135deg, rgba(255, 150, 0, 0.8), rgba(255, 50, 80, 0.8));
}

.category-tag.Misc {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.8), rgba(200, 50, 150, 0.8));
}

.category-tag.理论题 {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.8), rgba(139, 92, 246, 0.8));
}

.score-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--warning);
    font-weight: 500;
}

.card-body {
    padding: 1.5rem;
}

.challenge-title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.challenge-desc {
    color: var(--gray);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.challenge-meta {
    display: flex;
    gap: 1rem;
    color: var(--gray);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.challenge-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status-solved {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success);
    font-weight: 500;
}

.no-challenges {
    text-align: center;
    padding: 4rem;
    color: var(--gray);
}

.no-challenges i {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* ===== 题目详情 ===== */
.challenge-detail {
}

.challenge-content {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
}

.main-panel {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.panel-header {
    padding: 1.5rem;
    background: rgba(15, 35, 70, 0.9);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.challenge-info {
    display: flex;
    gap: 0.5rem;
}

.info-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    font-size: 0.85rem;
}

.info-tag.type-theory {
    background: rgba(99, 102, 241, 0.3);
    color: rgba(129, 140, 248, 0.9);
}

.info-tag.type-practice {
    background: rgba(0, 212, 255, 0.3);
    color: rgba(0, 212, 255, 0.9);
}

.info-tag.score {
    background: rgba(255, 180, 0, 0.3);
    color: rgba(255, 180, 0, 0.9);
}

.info-tag.solved {
    background: rgba(0, 255, 200, 0.3);
    color: rgba(0, 255, 200, 0.9);
}

.panel-body {
    padding: 2rem;
}

.description-section {
    margin-bottom: 2rem;
}

.description-section h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.description-content {
    color: var(--gray);
    line-height: 1.8;
    padding: 1.5rem;
    background: rgba(15, 35, 70, 0.8);
    border-radius: 6px;
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.submit-section {
    background: rgba(15, 35, 70, 0.8);
    padding: 2rem;
    border-radius: 6px;
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.submit-section h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.flag-form {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.flag-form .input-group {
    flex: 1;
}

.submit-btn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, rgba(0, 150, 255, 0.9), rgba(0, 212, 255, 0.7));
    border: none;
    border-radius: 12px;
    color: var(--light);
    font-weight: bold;
    cursor: pointer;
}

.submit-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(0, 180, 255, 0.9), rgba(0, 230, 255, 0.8));
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-result {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 6px;
    display: none;
}

.submit-result.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    display: block;
}

.submit-result.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    display: block;
}

.success-message {
    text-align: center;
    padding: 3rem;
    color: var(--success);
}

.success-message i {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.success-message h3 {
    margin-bottom: 0.5rem;
}

/* Docker实例样式 */
.docker-loading {
    text-align: center;
    padding: 1.5rem;
}

.docker-loading i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.docker-loading .progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(15, 35, 70, 0.8);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.docker-loading .progress-fill {
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 150, 255, 0.9), rgba(0, 212, 255, 0.7));
}

.docker-loading p {
    color: var(--gray);
}

.docker-running {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.docker-url {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.docker-url label {
    color: var(--gray);
    font-size: 0.9rem;
}

.docker-url a {
    color: var(--success);
    text-decoration: none;
    font-weight: 500;
    word-break: break-all;
}

.docker-url a:hover {
    text-decoration: underline;
}

.docker-error {
    text-align: center;
    padding: 1.5rem;
}

.docker-error i {
    font-size: 2rem;
    color: var(--danger);
    margin-bottom: 1rem;
}

.docker-error p {
    color: var(--danger);
    margin-bottom: 1rem;
}

.docker-error button {
    margin-top: 0.5rem;
}

.side-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel-card {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.panel-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.panel-card ul {
    list-style: none;
    color: var(--gray);
}

.panel-card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.panel-card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.stats {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--dark-medium);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-row span:first-child {
    color: var(--gray);
}

/* ===== 管理后台 ===== */
.admin-page {
}

.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.admin-card {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.admin-card:hover {
    box-shadow: none;
    border-color: rgba(0, 212, 255, 0.5);
}

.admin-card .card-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.admin-card .card-icon.user {
    background: rgba(0, 212, 255, 0.3);
    color: rgba(0, 212, 255, 0.9);
}

.admin-card .card-icon.category {
    background: rgba(0, 150, 255, 0.3);
    color: rgba(0, 150, 255, 0.9);
}

.admin-card .card-icon.challenge {
    background: rgba(0, 255, 200, 0.3);
    color: rgba(0, 255, 200, 0.9);
}

.admin-card .card-icon.stats {
    background: rgba(255, 180, 0, 0.3);
    color: rgba(255, 180, 0, 0.9);
}

.admin-card h3 {
    margin-bottom: 0.5rem;
}

.admin-card p {
    color: var(--gray);
    margin-bottom: 1.5rem;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.admin-info {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.admin-info h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.info-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray);
}

.info-item i {
    color: var(--success);
}

.info-item i.fa-exclamation-triangle {
    color: var(--warning);
}

/* ===== 表格样式 ===== */
.table-container {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: rgba(15, 35, 70, 0.9);
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--dark-medium);
}

.data-table th {
    color: var(--gray);
    font-weight: 500;
}

.data-table tbody tr:hover {
    background: rgba(15, 35, 70, 0.9);
}

.badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-size: 0.85rem;
}

.badge-admin {
    background: rgba(0, 150, 255, 0.3);
    color: rgba(167, 139, 250, 0.9);
}

.badge-user {
    background: rgba(0, 212, 255, 0.3);
    color: rgba(0, 212, 255, 0.9);
}

.badge-theory {
    background: rgba(99, 102, 241, 0.3);
    color: rgba(129, 140, 248, 0.9);
}

.badge-practice {
    background: rgba(0, 212, 255, 0.3);
    color: rgba(0, 212, 255, 0.9);
}

/* ===== 表单样式 ===== */
.form-page {
}

.form-container {
    max-width: 600px;
    margin: 0 auto;
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.admin-form .form-group {
    margin-bottom: 1.5rem;
}

.admin-form .form-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.admin-form .form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.admin-form label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--light);
    font-weight: 500;
}

.admin-form input[type="text"],
.admin-form input[type="password"],
.admin-form input[type="number"],
.admin-form select,
.admin-form textarea {
    width: 100%;
    padding: 1rem;
    background: rgba(15, 35, 70, 0.8);
    border: 2px solid transparent;
    border-radius: 6px;
    color: var(--light);
    font-size: 1rem;
}

.admin-form input:focus,
.admin-form select:focus,
.admin-form textarea:focus {
    outline: none;
    border-color: rgba(0, 212, 255, 0.8);
    box-shadow: none;
}

.admin-form textarea {
    resize: vertical;
    min-height: 100px;
}

.file-path-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: rgba(15, 35, 70, 0.8);
    border: 2px solid transparent;
    border-radius: 6px;
    color: var(--light);
    font-size: 1rem;
}

.file-path-input:focus {
    outline: none;
    border-color: rgba(0, 212, 255, 0.8);
    box-shadow: none;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient);
    color: var(--light);
}

.btn-primary:hover {
    box-shadow: none;
}

.btn-secondary {
    background: var(--dark-medium);
    color: var(--light);
}

.btn-secondary:hover {
    background: var(--dark-light);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.3);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

/* ===== 分类管理卡片 ===== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.category-manage-card {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.category-manage-card .card-header {
    padding: 1.5rem;
    background: rgba(15, 35, 70, 0.9);
}

.category-manage-card .card-header h3 {
    color: rgba(0, 212, 255, 0.9);
}

.category-manage-card .card-body {
    padding: 1.5rem;
}

.category-manage-card .card-body p {
    color: var(--gray);
}

.category-manage-card .card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--dark-medium);
    display: flex;
    justify-content: flex-end;
}

/* ===== 排行榜 ===== */
.leaderboard-page {
}

.leaderboard-container {
    background: rgba(10, 25, 50, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table thead {
    background: rgba(15, 35, 70, 0.9);
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--dark-medium);
}

.leaderboard-table th {
    color: var(--gray);
    font-weight: 500;
}

.leaderboard-table tbody tr:hover {
    background: rgba(15, 35, 70, 0.9);
}

.leaderboard-table tbody tr.top-3 {
    background: rgba(0, 212, 255, 0.15);
}

.leaderboard-table i.fa-crown {
    font-size: 1.5rem;
}

.leaderboard-table i.fa-crown.gold {
    color: #ffd700;
}

.leaderboard-table i.fa-crown.silver {
    color: #c0c0c0;
}

.leaderboard-table i.fa-crown.bronze {
    color: #cd7f32;
}



/* ===== 提示消息 ===== */
.alert {
    padding: 1rem 2rem;
    border-radius: 6px;
    margin: 2rem auto;
    max-width: 600px;
    text-align: center;
}

.alert-error {
    background: rgba(255, 50, 100, 0.25);
    color: rgba(255, 50, 100, 0.9);
    border: 1px solid rgba(255, 50, 100, 0.5);
}

.alert-success {
    background: rgba(0, 255, 200, 0.25);
    color: rgba(0, 255, 200, 0.9);
    border: 1px solid rgba(0, 255, 200, 0.5);
}

.alert-warning {
    background: rgba(255, 180, 0, 0.25);
    color: rgba(255, 180, 0, 0.9);
    border: 1px solid rgba(255, 180, 0, 0.5);
}

.alert-info {
    background: rgba(0, 212, 255, 0.25);
    color: rgba(0, 212, 255, 0.9);
    border: 1px solid rgba(0, 212, 255, 0.5);
}

/* ===== Flash消息 ===== */
.flash-message {
    position: fixed;
    top: 100px;
    left: 50%;
    transform: translateX(-50%);
    padding: 1rem 2rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 2000;
}

.flash-message.error {
    color: rgba(255, 100, 100, 1);
}

.flash-message.info {
    color: rgba(200, 230, 255, 1);
}

.flash-message i {
    font-size: 1.2rem;
}


    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .challenge-content {
        grid-template-columns: 1fr;
    }

    .side-panel {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .panel-card {
        flex: 1;
        min-width: 250px;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .user-info {
        flex-direction: column;
        gap: 0.5rem;
    }

    .login-container {
        flex-direction: column;
    }

    .login-decoration {
        display: none;
    }

    .welcome-banner {
        padding: 2rem;
    }

    .banner-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .quick-access {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
    }

    .admin-grid {
        grid-template-columns: 1fr;
    }

    .flag-form {
        flex-direction: column;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(5, 15, 30, 0.95);
}

::-webkit-scrollbar-thumb {
    background: rgba(15, 35, 70, 0.8);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 212, 255, 0.8);
}

/* ===== Docker实例信息块样式 ===== */
.docker-instance-info {
    background: rgba(7, 57, 121, 0.15);
    border: 1px solid rgba(0, 59, 169, 0.3);
    border-radius: 8px;
    padding: 20px;
    margin-top: 15px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.docker-instance-link {
    display: flex;
    justify-content: center;
}

.instance-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--success);
    color: var(--dark);
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
}

.instance-link-btn:hover {
    background: rgba(0, 255, 200, 0.9);
    box-shadow: 0 4px 15px rgba(0, 255, 200, 0.3);
}

.docker-instance-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    background: rgba(0, 59, 169, 0.2);
    border-radius: 6px;
    font-size: 18px;
    font-weight: 600;
    color: var(--light);
}

.docker-instance-timer i {
    color: var(--warning);
}

.docker-instance-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.docker-instance-actions .btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
}

.docker-instance-actions .btn-primary {
    background: var(--primary);
    color: var(--light);
}

.docker-instance-actions .btn-primary:hover {
    background: var(--secondary);
}

.docker-instance-actions .btn-danger {
    background: var(--danger);
    color: var(--light);
}

.docker-instance-actions .btn-danger:hover {
    background: rgba(255, 50, 100, 0.9);
}

/* ===== 管理后台布局 ===== */
.admin-layout-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #0a0f1a 0%, #0d1525 100%);
}

.admin-layout-container {
    display: flex;
    gap: 0;
    height: 100vh;
    background: rgba(7, 57, 121, 0.1);
    border-radius: 12px;
    overflow: hidden;
    backdrop-filter: blur(3px);
}

/* ===== 侧边栏 ===== */
.admin-sidebar {
    width: 240px;
    background: rgba(7, 57, 121, 0.15);
    border-right: 1px solid rgba(0, 59, 169, 0.3);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.admin-sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(0, 59, 169, 0.3);
}

.admin-sidebar-header h2 {
    color: #ffffff;
    font-size: 18px;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.admin-sidebar-nav {
    flex: 1;
    padding: 10px 0;
    overflow-y: auto;
}

.admin-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    color: #ffffff;
    text-decoration: none;
    border-left: 3px solid transparent;
}

.admin-nav-item:hover {
    background: rgba(7, 57, 121, 0.25);
    color: #ffffff;
}

.admin-nav-item.active {
    background: rgba(0, 59, 169, 0.3);
    color: #00d4ff;
    border-left-color: #00d4ff;
}

.nav-icon-text {
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 40px;
    text-align: center;
}

/* ===== 主内容区域 ===== */
.admin-main {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
    background: rgba(7, 57, 121, 0.05);
}

.admin-content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.admin-content-wrapper h1 {
    color: #ffffff;
    font-size: 28px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ===== 内容头部 ===== */
.admin-content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

/* ===== 管理后台表格 ===== */
.admin-table-container {
    background: rgba(7, 57, 121, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(0, 59, 169, 0.3);
    overflow: hidden;
}

.admin-data-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-data-table thead {
    background: rgba(0, 59, 169, 0.2);
}

.admin-data-table th {
    color: #00d4ff;
    font-weight: 600;
    font-size: 14px;
    padding: 16px;
    text-align: left;
    border-bottom: 2px solid rgba(0, 59, 169, 0.3);
}

.admin-data-table td {
    color: #ffffff;
    padding: 16px;
}

.admin-data-table tbody tr {
}

.admin-data-table tbody tr:hover {
    background: rgba(7, 57, 121, 0.15);
}

/* ===== 管理后台徽章 ===== */
.admin-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.admin-badge-admin {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.admin-badge-user {
    background: rgba(0, 150, 255, 0.2);
    color: #ffffff;
}

/* ===== 管理后台按钮 ===== */
.admin-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.admin-btn-primary {
    background: rgba(0, 59, 169, 0.5);
    border: 1px solid rgba(0, 59, 169, 0.5);
    color: white;
}

.admin-btn-primary:hover {
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.4);
}

.admin-btn-secondary {
    background: rgba(0, 59, 169, 0.2);
    color: #ffffff;
    border: 1px solid rgba(0, 59, 169, 0.3);
}

.admin-btn-secondary:hover {
    background: rgba(0, 59, 169, 0.35);
}

.admin-btn-danger {
    background: rgba(255, 82, 82, 0.2);
    color: #ff5252;
    border: 1px solid rgba(0, 59, 169, 0.3);
}

.admin-btn-danger:hover {
    background: rgba(255, 82, 82, 0.35);
}

.admin-btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

/* ===== 复选框组样式 ===== */
.checkbox-group {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0;
}

.checkbox-group label {
    margin-bottom: 0;
    cursor: pointer;
    color: #ffffff;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #00d4ff;
    margin-right: 10px;
    flex-shrink: 0;
}

.hint {
    font-size: 12px;
    color: #ffffff;
    margin-top: 6px;
    opacity: 0.7;
}

/* ===== 管理后台滚动条 ===== */
.admin-main::-webkit-scrollbar,
.admin-sidebar-nav::-webkit-scrollbar,
.admin-form textarea::-webkit-scrollbar {
    width: 6px;
}

.admin-main::-webkit-scrollbar-track,
.admin-sidebar-nav::-webkit-scrollbar-track,
.admin-form textarea::-webkit-scrollbar-track {
    background: rgba(7, 57, 121, 0.05);
}

.admin-main::-webkit-scrollbar-thumb,
.admin-sidebar-nav::-webkit-scrollbar-thumb,
.admin-form textarea::-webkit-scrollbar-thumb {
    background: rgba(0, 59, 169, 0.3);
    border-radius: 3px;
}

.admin-main::-webkit-scrollbar-thumb:hover,
.admin-sidebar-nav::-webkit-scrollbar-thumb:hover,
.admin-form textarea::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 59, 169, 0.5);
}

/* ===== 文件上传样式 ===== */
.admin-form input[type="file"] {
    display: none;
}

.file-upload-wrapper {
    position: relative;
    width: 100%;
}

.file-upload-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 20px;
    background: rgba(15, 35, 70, 0.8);
    border: 2px dashed rgba(0, 212, 255, 0.4);
    border-radius: 8px;
    color: var(--gray);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}

.file-upload-btn:hover {
    background: rgba(0, 59, 169, 0.3);
    border-color: rgba(0, 212, 255, 0.8);
    color: var(--light);
}

.file-upload-btn.has-file {
    border-style: solid;
    border-color: rgba(0, 255, 200, 0.6);
    color: rgba(0, 255, 200, 0.9);
}

.file-upload-btn.has-file:hover {
    border-color: rgba(0, 255, 200, 0.8);
}