:root {
    --color-primary: #63b3ed;
    --color-primary-dark: #4299e1;
    --color-secondary: #fa8c16;
    --color-success: #52c41a;
    --color-warning: #faad14;
    --color-bg-dark: #1a202c;
    --color-bg-dark-light: #2d3748;
    --color-bg-light: #f5f7fa;
    --color-text: #333;
    --color-text-light: #cbd5e0;
    --color-text-muted: #666;
    --color-card-bg: #fff;
    --color-card-border: #eee;
    --color-tag-auth: #fff7e6;
    --color-tag-auth-text: #fa8c16;
    --color-tag-huahuo: #fff2e8;
    --color-tag-huahuo-text: #ff7d00;
    --color-tag-normal: #e6f4ff;
    --color-tag-normal-text: var(--color-primary-dark);
    --color-tag-painter: #fce4f0;
    --color-tag-painter-text: #eb2f96;
    --shadow-card: 0 2px 15px rgba(0, 0, 0, 0.1);
    --shadow-card-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition-speed: 0.3s;
    --header-height: 60px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
    background: var(--color-bg-light);
    color: var(--color-text);
    line-height: 1.6;
    padding-top: var(--header-height);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

a:hover,
a:focus {
    color: var(--color-primary-dark);
    text-decoration: underline;
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

a:focus:not(:focus-visible) {
    outline: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
    scroll-margin-top: var(--header-height);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--color-bg-dark);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 2px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--transition-speed) ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 12px rgba(99, 179, 237, 0.3);
}

.btn:hover,
.btn:focus {
    background-color: var(--color-primary-dark);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(99, 179, 237, 0.4);
}

.btn-warning {
    background: var(--color-warning);
    box-shadow: 0 4px 12px rgba(250, 173, 20, 0.3);
}

.btn-warning:hover,
.btn-warning:focus {
    background-color: #fa8c16;
    box-shadow: 0 6px 18px rgba(250, 173, 20, 0.4);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

.no-results {
    text-align: center;
    padding: 3rem;
    grid-column: 1 / -1;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    background: var(--color-card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-card);
}

.team-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.sort-label {
    font-weight: 500;
    color: var(--color-text-muted);
}

.sort-btn {
    padding: 6px 12px;
    background: #f0f0f0;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--color-text);
}

.sort-btn:hover {
    background: #e0e0e0;
    transform: translateY(-1px);
}

.sort-btn.active {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 179, 237, 0.3);
}

.site-header {
    background: var(--color-bg-dark);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-emoji {
    font-size: 2rem;
    display: inline-block;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.logo-text {
    color: var(--color-primary);
    font-size: 1.5rem;
    font-weight: bold;
    letter-spacing: 1px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-nav {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--color-text-light);
    padding: 6px 12px;
    border-radius: 6px;
    transition: all var(--transition-speed) ease;
    position: relative;
    font-weight: 500;
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
    color: var(--color-primary);
    background-color: rgba(99, 179, 237, 0.15);
    text-decoration: none;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 12px;
    right: 12px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

.nav-search {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid transparent;
    outline: none;
    background: var(--color-bg-dark-light);
    color: #fff;
    font-size: 0.9rem;
    width: 180px;
    transition: all var(--transition-speed) ease;
}

.nav-search:focus {
    background: #4a5568;
    border-color: var(--color-primary);
    width: 200px;
}

.nav-search::placeholder {
    color: #a0aec0;
}

.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-bg-dark), var(--color-bg-dark-light));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(99, 179, 237, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(250, 140, 22, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.hero-content > p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.establish-date {
    font-size: 1rem;
    opacity: 0.8;
    margin-bottom: 2rem;
    color: var(--color-text-light);
}

.about-content {
    display: flex;
    gap: 3rem;
    align-items: center;
    flex-wrap: wrap;
}

.about-text {
    flex: 1;
    min-width: 300px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

.about-text strong {
    color: var(--color-bg-dark);
}

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

.member-card {
    background: var(--color-card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-card);
    text-align: center;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid var(--color-card-border);
    overflow: hidden;
}

.member-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
}

.member-card.leader::before { background: var(--color-secondary); }
.member-card.deputy::before { background: var(--color-success); }
.member-card.member::before { background: var(--color-primary); }

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

.member-name {
    color: var(--color-bg-dark);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.member-role {
    color: var(--color-primary-dark);
    font-weight: bold;
    margin: 0.3rem 0;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin: 0.8rem 0;
}

.tag {
    display: inline-block;
    padding: 0.25em 0.6em;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.tag--auth {
    background: var(--color-tag-auth);
    color: var(--color-tag-auth-text);
}

.tag--huahuo {
    background: var(--color-tag-huahuo);
    color: var(--color-tag-huahuo-text);
}

.tag--normal {
    background: var(--color-tag-normal);
    color: var(--color-tag-normal-text);
}

.tag--painter {
    background: var(--color-tag-painter);
    color: var(--color-tag-painter-text);
}

.member-stats {
    margin-top: 0.5rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.member-links {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--color-card-border);
}

.member-link {
    display: inline-block;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: 20px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    transition: all var(--transition-speed) ease;
}

.member-link:hover,
.member-link:focus {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 179, 237, 0.3);
    text-decoration: none;
    color: white;
}

.member-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: #888;
    margin-top: 1rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-card-border);
}

.info-list {
    text-align: center;
    font-size: 1.1rem;
    line-height: 2.2;
    list-style: none;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--color-card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-card);
}

.info-list li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    text-align: left;
}

.info-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.join-content {
    max-width: 800px;
    margin: 0 auto;
}

.join-content > p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--color-text);
}

.join-content .info-list {
    margin-bottom: 2rem;
}

.contact-hint {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(99, 179, 237, 0.05) 0%, rgba(250, 173, 20, 0.05) 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-warning);
    margin-top: 2rem;
}

.contact-hint p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.email-highlight {
    font-size: 1.3rem;
    color: var(--color-warning);
    font-weight: bold;
    background: rgba(255, 255, 255, 0.9);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    display: inline-block;
    margin: 1rem 0;
    border: 2px dashed var(--color-warning);
}

.recruit-btn {
    margin-top: 1.5rem;
}

.site-footer {
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-info {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

.error-message {
    text-align: center;
    padding: 3rem;
    background: var(--color-card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-card);
}

.error-message p {
    color: #dc3545;
    margin-bottom: 1rem;
}

.retry-btn {
    padding: 8px 20px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
}

.retry-btn:hover {
    background: var(--color-primary-dark);
}

@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem 0;
    }

    .main-nav {
        order: 3;
        width: 100%;
        margin-top: 1rem;
        justify-content: center;
    }

    .nav-list {
        gap: 0.8rem;
        flex-wrap: wrap;
    }

    .nav-search {
        width: 140px;
    }
    
    .nav-search:focus {
        width: 160px;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content > p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }
    
    .section-title::after {
        width: 40px;
        height: 3px;
    }

    .team-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.5rem;
    }
    
    .team-controls {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .sort-controls {
        width: 100%;
        justify-content: center;
    }
    
    .info-list {
        padding: 1.5rem;
        font-size: 1rem;
    }
    
    .info-list li {
        padding-left: 1.2rem;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
    
    .tag {
        font-size: 0.7rem;
        word-break: break-word;
        white-space: normal;
    }
    
    .email-highlight {
        font-size: 1.1rem;
        padding: 0.6rem 1rem;
    }
    
    .join-content > p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 15px;
        right: 15px;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .member-name {
        font-size: 1.2rem;
    }
    
    .nav-list {
        justify-content: space-around;
    }
    
    .nav-link {
        font-size: 0.9rem;
        padding: 4px 8px;
    }
    
    .email-highlight {
        font-size: 1rem;
        padding: 0.5rem 0.8rem;
    }
    
    .contact-hint {
        padding: 1.5rem;
    }
}