/* 医学化学虚拟实验室主题 - 科技感深色主题 */
:root {
    --primary-color: #2ecc71; /* 调整为医疗绿色 */
    --secondary-color: #3498db; /* 调整为实验蓝色 */
    --accent-color: #9b59b6; /* 保留紫色用于特殊元素 */
    --danger-color: #e74c3c; /* 危险化学品红色 */
    --warning-color: #f39c12; /* 警告黄色 */
    --lab-green: #27ae60; /* 实验室专用绿色 */
    --chemical-blue: #2980b9; /* 化学试剂蓝色 */
    --medical-white: #ecf0f1; /* 医疗白色 */
    --glass-color: rgba(255, 255, 255, 0.1); /* 玻璃器皿效果 */
    --dark-bg: #0a1929; /* 深蓝色背景，类似实验室深色台面 */
    --card-bg: rgba(16, 32, 48, 0.9); /* 半透明卡片背景 */
    --light-text: #ecf0f1;
    --muted-text: #7f8c8d;
    --border-color: #34495e;
    --input-bg: rgba(44, 62, 80, 0.7);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    --transition: all 0.3s ease;
    --lab-equipment: #95a5a6; /* 实验器材灰色 */
}

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

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: 
        linear-gradient(135deg, var(--dark-bg) 0%, #0c2b46 100%),
        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M20,20 L80,80 M80,20 L20,80" stroke="rgba(46, 204, 113, 0.05)" stroke-width="1"/><circle cx="50" cy="50" r="20" stroke="rgba(52, 152, 219, 0.05)" stroke-width="1" fill="none"/></svg>');
    color: var(--light-text);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(46, 204, 113, 0.03) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(52, 152, 219, 0.03) 0%, transparent 20%);
    pointer-events: none;
    z-index: -1;
}

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

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-color);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--lab-green), var(--chemical-blue));
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    border-color: rgba(46, 204, 113, 0.3);
}

h1, h2, h3, h4 {
    color: var(--light-text);
    margin-bottom: 20px;
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--lab-green), var(--chemical-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--lab-green), var(--chemical-blue));
    border-radius: 2px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--light-text);
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--light-text);
    font-size: 16px;
    transition: var(--transition);
    font-family: 'Courier New', monospace;
}

.form-control:focus {
    outline: none;
    border-color: var(--lab-green);
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
    background: rgba(44, 62, 80, 0.9);
}

.form-control::placeholder {
    color: var(--muted-text);
    font-style: italic;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, var(--lab-green) 0%, #219653 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(46, 204, 113, 0.4);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, var(--chemical-blue) 0%, #1f618d 100%);
}

.btn-secondary:hover {
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #c0392b 100%);
}

.btn-danger:hover {
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-color) 0%, #8e44ad 100%);
}

.btn-accent:hover {
    box-shadow: 0 5px 15px rgba(155, 89, 182, 0.4);
}

.navbar {
    background: rgba(10, 25, 41, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(46, 204, 113, 0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--lab-green), var(--chemical-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-brand::before {
    content: '⚗️';
    font-size: 1.5rem;
}

.nav-brand span {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-links a {
    color: var(--light-text);
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 6px;
    transition: var(--transition);
    font-weight: 500;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover {
    background: rgba(46, 204, 113, 0.1);
    color: var(--lab-green);
    border-bottom: 2px solid var(--lab-green);
}

.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 100px);
    padding: 20px;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    border-top: 5px solid var(--lab-green);
}

.user-panel {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.1) 0%, rgba(52, 152, 219, 0.1) 100%);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid var(--glass-color);
    position: relative;
}

.user-panel::before {
    content: '🧪';
    position: absolute;
    top: -15px;
    right: 20px;
    font-size: 2rem;
    opacity: 0.5;
}

.user-panel h3 {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-panel p {
    margin-bottom: 8px;
    color: var(--muted-text);
}

.user-panel strong {
    color: var(--light-text);
}

.flash-messages {
    margin-bottom: 25px;
}

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-left: 5px solid;
}

.alert::before {
    font-size: 18px;
}

.alert-success {
    background: rgba(46, 204, 113, 0.1);
    color: var(--lab-green);
    border-color: var(--lab-green);
}

.alert-success::before {
    content: '✓';
}

.alert-error {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.alert-error::before {
    content: '⚠';
}

.alert-info {
    background: rgba(52, 152, 219, 0.1);
    color: var(--chemical-blue);
    border-color: var(--chemical-blue);
}

.alert-info::before {
    content: 'ℹ';
}

.link {
    color: var(--lab-green);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px dotted var(--lab-green);
    padding-bottom: 2px;
}

.link:hover {
    color: var(--chemical-blue);
    text-decoration: none;
    border-bottom: 1px solid var(--chemical-blue);
}

.form-hint {
    font-size: 12px;
    color: var(--muted-text);
    margin-top: 5px;
    font-style: italic;
}

.page-header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
}

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

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .card {
        padding: 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .auth-card {
        max-width: 100%;
    }
}

.game-control-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    background: rgba(10, 25, 41, 0.95);
    backdrop-filter: blur(15px);
    padding: 20px;
    border-radius: 12px;
    min-width: 250px;
    border: 1px solid rgba(46, 204, 113, 0.3);
    box-shadow: var(--shadow);
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(46, 204, 113, 0.2);
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--lab-green), var(--chemical-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.user-details p {
    margin: 0;
    font-size: 14px;
}

.user-details .username {
    font-weight: 600;
    color: var(--light-text);
}

.user-details .email {
    font-size: 12px;
    color: var(--muted-text);
}

.control-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.control-buttons a {
    flex: 1;
    min-width: 100px;
    text-align: center;
    padding: 8px 0;
    font-size: 14px;
}

.not-found-container {
    text-align: center;
    padding: 60px 20px;
}

.not-found-code {
    font-size: 8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--lab-green), var(--chemical-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.not-found-message {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: var(--muted-text);
}

/* 新增医学化学主题元素 */
.lab-equipment-icon {
    color: var(--lab-equipment);
    font-size: 1.2rem;
}

.chemical-formula {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 8px;
    border-radius: 4px;
    border-left: 3px solid var(--chemical-blue);
}

.molecule-background {
    position: absolute;
    width: 300px;
    height: 300px;
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}

.molecule-1 {
    top: 10%;
    left: 5%;
    background: radial-gradient(circle, var(--lab-green) 0%, transparent 70%);
}

.molecule-2 {
    bottom: 10%;
    right: 5%;
    background: radial-gradient(circle, var(--chemical-blue) 0%, transparent 70%);
}