/* 基础样式 */
:root {
    --sunshine-yellow: #FFD166;
    --happy-orange: #FF9A3C;
    --sky-blue: #06AED5;
    --grass-green: #7BC043;
    --cloud-white: #F8F9FA;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Comic Neue', cursive, sans-serif;
    background-color: var(--cloud-white);
    margin: 0;
    padding: 0;
    color: #333;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* 太阳背景 */
.sun-background {
    position: fixed;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background-color: var(--sunshine-yellow);
    border-radius: 50%;
    box-shadow: 0 0 60px var(--sunshine-yellow);
    z-index: -1;
    animation: pulse 4s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.1); opacity: 1; }
}

/* 容器样式 */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

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

header h1 {
    color: var(--happy-orange);
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px var(--shadow-color);
}

nav a {
    margin: 0 10px;
    color: var(--sky-blue);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--happy-orange);
}

/* 表单样式 */
.form-container {
    background-color: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 15px var(--shadow-color);
    max-width: 500px;
    margin: 0 auto;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-weight: bold;
    color: var(--happy-orange);
}

.form-control {
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--sky-blue);
}

/* 按钮样式 */
.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    background-color: var(--happy-orange);
    color: white;
    font-weight: bold;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.btn:hover {
    background-color: var(--sunshine-yellow);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--sky-blue);
}

.btn-primary:hover {
    background-color: #0492b3;
}

/* 错误消息 */
.error {
    color: #FF6B6B;
    font-size: 0.9rem;
}

.flash-messages {
    margin-bottom: 20px;
}

.flash {
    padding: 10px 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    text-align: center;
}

.flash.success {
    background-color: #D4EDDA;
    color: #155724;
}

.flash.danger {
    background-color: #F8D7DA;
    color: #721C24;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: 15px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    animation: modalFadeIn 0.3s;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal h2 {
    color: var(--grass-green);
    margin-bottom: 20px;
}

.user-info {
    background-color: #f0f8ff;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: left;
}

.user-info p {
    margin: 10px 0;
}

.countdown {
    font-size: 1.2rem;
    color: var(--happy-orange);
    margin: 20px 0;
}

/* 页脚链接 */
.form-footer {
    text-align: center;
    margin-top: 20px;
    color: #666;
}

.form-footer a {
    color: var(--sky-blue);
    text-decoration: none;
    transition: color 0.3s;
}

.form-footer a:hover {
    color: var(--happy-orange);
}

/* 记住我复选框样式 */
.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 15px;
}

.remember-me input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--sky-blue);
}

.remember-me label {
    cursor: pointer;
    font-size: 0.95rem;
    color: #666;
}

/* 群组相关样式 */
.group-card {
    display: flex;
    background-color: white;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 3px 10px var(--shadow-color);
    transition: transform 0.3s;
}

.group-card:hover {
    transform: translateY(-3px);
}

.group-avatar {
    width: 60px;
    height: 60px;
    margin-right: 15px;
    flex-shrink: 0;
}

.default-avatar {
    width: 100%;
    height: 100%;
    background-color: var(--sky-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.group-info {
    flex-grow: 1;
    position: relative;
}

.group-info h3 {
    margin-top: 0;
    margin-bottom: 5px;
}

.group-info h3 a {
    color: var(--happy-orange);
    text-decoration: none;
}

.group-info p {
    color: #666;
    margin-bottom: 10px;
}

.member-count {
    color: #888;
    font-size: 0.9rem;
}

/* 加入群组按钮样式 */
.join-btn {
    position: absolute;
    top: 0;
    right: 0;
    padding: 8px 15px;
    background-color: var(--grass-green);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

.join-btn:hover {
    background-color: #6aad39;
    transform: translateY(-2px);
}

.join-btn:active {
    transform: translateY(0);
}

/* 搜索框样式 */
.search-container {
    display: flex;
    margin-bottom: 20px;
}

.search-container input {
    flex-grow: 1;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 8px 0 0 8px;
    font-size: 1rem;
}

.search-container button {
    padding: 10px 15px;
    background-color: var(--sky-blue);
    color: white;
    border: none;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
}

.no-groups {
    text-align: center;
    color: #888;
    padding: 20px;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .form-container {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .group-card {
        flex-direction: column;
    }
    
    .group-avatar {
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    .join-btn {
        position: static;
        margin-top: 10px;
        width: 100%;
    }
}