/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Roboto, system-ui, sans-serif;
    background: #f6f8fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    padding: 0 32px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}
.navbar .nav-left {
    display: flex;
    align-items: center;
    gap: 20px;
}
.navbar .nav-brand {
    font-size: 1.0rem;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: -0.3px;
    transition: 0.2s;
    text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.navbar .nav-brand:hover {
    color: #ffd700;
}
.navbar .nav-menu a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    padding: 4px 14px;
    border-radius: 14px;
    font-weight: 500;
    font-size: 0.85rem;
    transition: 0.2s;
    white-space: nowrap;
    text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.navbar .nav-menu a:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}
.navbar .nav-menu a.active {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}
.navbar .user-area {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.navbar .user-area .btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.5);
    padding: 3px 14px;
    border-radius: 14px;
    font-weight: 500;
    font-size: 0.8rem;
    color: #ffffff;
    cursor: pointer;
    transition: 0.2s;
    line-height: 1.6;
    text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.navbar .user-area .btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
}
.navbar .user-area .register-btn {
    background: rgba(255, 255, 255, 0.2);
}
.navbar .user-area .register-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}
.navbar .user-area .user-info {
    display: none;
    align-items: center;
    gap: 8px;
    color: #fff;
}
.navbar .user-area .user-info .avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.8rem;
    border: 1px solid rgba(255,255,255,0.3);
}
.navbar .user-area .user-info .username {
    font-size: 0.8rem;
}
.navbar .user-area .user-info .logout-btn {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.3);
    padding: 2px 12px;
    border-radius: 12px;
    font-size: 0.7rem;
    cursor: pointer;
    color: #fff;
    transition: 0.2s;
}
.navbar .user-area .user-info .logout-btn:hover {
    background: rgba(255,0,0,0.3);
}

/* ===== 品牌横幅 ===== */
.hero-banner {
    width: 100%;
    height: 180px;
    background-image: url('../images/mcmrchenhead.png');
    justify-content: flex-start;
    padding-left: 40px;
    padding-top: 30px;
    color: #ffffff;
    flex-shrink: 0;
    position: relative;
    margin-top: -38px;
    z-index: 0;
}
.hero-banner .banner-content {
    position: relative;
    z-index: 2;
    text-align: left;
}
.hero-banner .logo {
    font-size: 3.6rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    color: #ffd700;
}
.hero-banner .slogan {
    font-size: 1.0rem;
    font-weight: 300;
    margin-top: 6px;
    opacity: 0.85;
    letter-spacing: 4px;
}

/* ===== 主页内容 ===== */
.main-content {
    flex: 1;
    background: #f6f8fa;
    padding: 24px 32px 20px;
}
.home-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 28px;
    max-width: 1200px;
    margin: 0 auto;
}
.game-section {
    background: #ffffff;
    border-radius: 16px;
    padding: 20px 24px 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    border: 1px solid #edf2f7;
}
.game-section .section-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: #1e1e2e;
    margin-bottom: 16px;
}
.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}
.game-card {
    background: #f8f9fc;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #edf2f7;
    transition: 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
}
.game-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.06);
}
.game-card .card-img {
    height: 120px;
    background: #e9ecf2;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: #8b9bb5;
}
.game-card .card-body {
    padding: 12px 16px 16px;
}
.game-card .card-body h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}
.game-card .card-body p {
    color: #5a5a72;
    font-size: 0.85rem;
    margin-bottom: 8px;
}
.game-card .card-body .tag {
    display: inline-block;
    background: #eef2f7;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.7rem;
    color: #4a4a5a;
}
.message-section {
    background: #ffffff;
    border-radius: 16px;
    padding: 20px 24px 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    border: 1px solid #edf2f7;
}
.message-section .section-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: #1e1e2e;
    margin-bottom: 16px;
}
.message-list {
    list-style: none;
}
.message-list li {
    padding: 12px 0;
    border-bottom: 1px solid #f0f2f5;
    color: #2d2d44;
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.message-list li:last-child {
    border-bottom: none;
}
.message-list .msg-time {
    color: #8b9bb5;
    font-size: 0.8rem;
    white-space: nowrap;
    min-width: 80px;
}
.message-list .msg-content {
    flex: 1;
}
.message-list .msg-content .highlight {
    color: #5b7cfa;
    font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
    background: #ffffff;
    border-top: 1px solid #edf2f7;
    padding: 16px 32px;
    text-align: center;
    color: #8b9bb5;
    font-size: 0.8rem;
    flex-shrink: 0;
}
.footer a {
    color: #5b7cfa;
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline;
}

/* ===== 模态框 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    justify-content: center;
    align-items: center;
}
.modal-overlay.active {
    display: flex;
}
.modal-box {
    background: #fff;
    border-radius: 16px;
    padding: 30px 35px;
    width: 100%;
    max-width: 400px;
    position: relative;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.modal-box .close-btn {
    position: absolute;
    top: 12px;
    right: 18px;
    font-size: 1.5rem;
    cursor: pointer;
    color: #8b9bb5;
    transition: 0.2s;
    background: none;
    border: none;
}
.modal-box .close-btn:hover {
    color: #1e1e2e;
}
.modal-box .tabs {
    display: flex;
    border-bottom: 2px solid #edf2f7;
    margin-bottom: 20px;
}
.modal-box .tab-btn {
    flex: 1;
    padding: 10px 0;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: #4a4a5a;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: 0.2s;
}
.modal-box .tab-btn.active {
    color: #5b7cfa;
    border-bottom-color: #5b7cfa;
}
.modal-box .tab-content {
    display: none;
}
.modal-box .tab-content.active {
    display: block;
}
.modal-box label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: #2d2d44;
    margin-bottom: 4px;
}
.modal-box input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    font-size: 0.95rem;
    margin-bottom: 14px;
    outline: none;
    transition: 0.2s;
}
.modal-box input:focus {
    border-color: #5b7cfa;
    box-shadow: 0 0 0 3px rgba(91,124,250,0.1);
}
.modal-box .submit-btn {
    width: 100%;
    padding: 10px;
    background: #5b7cfa;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: 0.2s;
}
.modal-box .submit-btn:hover {
    background: #4a6adf;
}
.modal-box .error-msg {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 8px;
    text-align: center;
    min-height: 1.2em;
}
.modal-box .success-msg {
    color: #22c55e;
    font-size: 0.85rem;
    margin-top: 8px;
    text-align: center;
    min-height: 1.2em;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .navbar { padding: 0 16px; height: 34px; backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
    .navbar .nav-left { gap: 12px; }
    .navbar .nav-brand { font-size: 0.85rem; }
    .navbar .nav-menu a { padding: 3px 10px; font-size: 0.75rem; border-radius: 12px; }
    .navbar .user-area .btn { padding: 2px 10px; font-size: 0.7rem; }
    .navbar .user-area .user-info .username { font-size: 0.7rem; }
    .hero-banner { height: 130px; padding-left: 30px; margin-top: -34px; }
    .hero-banner .logo { font-size: 2.4rem; }
    .hero-banner .slogan { font-size: 0.85rem; letter-spacing: 2px; }
    .main-content { padding: 16px; }
    .home-grid { grid-template-columns: 1fr; gap: 20px; }
    .game-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .modal-box { margin: 20px; padding: 25px; }
    .footer { padding: 12px 16px; font-size: 0.7rem; }
}
@media (max-width: 480px) {
    .navbar { padding: 0 10px; height: 30px; backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
    .navbar .nav-left { gap: 6px; }
    .navbar .nav-brand { font-size: 0.75rem; }
    .navbar .nav-menu a { padding: 2px 6px; font-size: 0.65rem; border-radius: 10px; }
    .navbar .user-area .btn { padding: 2px 6px; font-size: 0.6rem; }
    .navbar .user-area .user-info .username { font-size: 0.6rem; }
    .navbar .user-area .user-info .logout-btn { font-size: 0.5rem; padding: 1px 8px; }
    .hero-banner { height: 100px; padding-left: 20px; margin-top: -30px; }
    .hero-banner .logo { font-size: 1.8rem; }
    .hero-banner .slogan { font-size: 0.7rem; letter-spacing: 1px; }
    .main-content { padding: 10px; }
    .game-section, .message-section { padding: 16px; }
    .game-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .game-card .card-img { height: 90px; font-size: 2.4rem; }
    .game-card .card-body { padding: 10px; }
    .game-card .card-body h4 { font-size: 0.95rem; }
    .message-list li { flex-wrap: wrap; }
    .message-list .msg-time { min-width: auto; width: 100%; color: #b0b8c8; font-size: 0.7rem; }
    .modal-box { padding: 20px; margin: 10px; }
    .footer { padding: 10px 12px; font-size: 0.6rem; }
}