/* 拟态风格 CSS */
:root {
    --bg-color: #e0e5ec;
    --text-color: #4a5568;
    --primary-color: #667eea;
    --shadow-light: #ffffff;
    --shadow-dark: #a3b1c6;
    --success-color: #48bb78;
    --danger-color: #f56565;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

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

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px;
    background: var(--bg-color);
    border-radius: 20px;
    box-shadow: 9px 9px 16px var(--shadow-dark), -9px -9px 16px var(--shadow-light);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.subtitle {
    color: #718096;
    font-size: 1.1em;
}

/* 拟态输入框 */
.neu-input {
    width: 100%;
    padding: 15px 20px;
    border: none;
    border-radius: 15px;
    background: var(--bg-color);
    box-shadow: inset 6px 6px 10px var(--shadow-dark), inset -6px -6px 10px var(--shadow-light);
    font-size: 16px;
    color: var(--text-color);
    transition: all 0.3s;
}

.neu-input:focus {
    outline: none;
    box-shadow: inset 4px 4px 8px var(--shadow-dark), inset -4px -4px 8px var(--shadow-light);
}

/* 拟态按钮 */
.neu-button {
    padding: 12px 30px;
    border: none;
    border-radius: 15px;
    background: var(--bg-color);
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
    color: var(--text-color);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.neu-button:hover {
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
}

.neu-button:active {
    box-shadow: inset 4px 4px 8px var(--shadow-dark), inset -4px -4px 8px var(--shadow-light);
}

.search-box {
    margin-bottom: 30px;
}

/* 任务网格 */
.tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.task-card {
    padding: 30px;
    border-radius: 20px;
    background: var(--bg-color);
    box-shadow: 9px 9px 16px var(--shadow-dark), -9px -9px 16px var(--shadow-light);
    transition: all 0.3s;
    text-align: center;
}

.task-card:hover {
    transform: translateY(-5px);
}

.task-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.task-card h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.task-card p {
    margin-bottom: 20px;
    color: #718096;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--bg-color);
    margin: 5% auto;
    padding: 40px;
    border-radius: 25px;
    box-shadow: 15px 15px 30px var(--shadow-dark), -15px -15px 30px var(--shadow-light);
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    color: #718096;
    cursor: pointer;
}

.close:hover {
    color: var(--danger-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #718096;
    font-size: 0.9em;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary-color), #764ba2);
    color: white;
    font-size: 18px;
    margin-top: 20px;
}

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 30px;
    border-radius: 15px;
    background: var(--bg-color);
    box-shadow: inset 6px 6px 10px var(--shadow-dark), inset -6px -6px 10px var(--shadow-light);
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    width: 0%;
    transition: width 0.3s;
    border-radius: 15px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #718096;
    font-size: 1.2em;
}

.admin-link {
    text-align: center;
    margin-top: 40px;
}

.admin-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

/* 管理后台样式 */
.admin-container {
    max-width: 1400px;
    margin: 0 auto;
}

.admin-nav {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-color);
    border-radius: 20px;
    box-shadow: 9px 9px 16px var(--shadow-dark), -9px -9px 16px var(--shadow-light);
}

.admin-nav a {
    padding: 12px 25px;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: all 0.3s;
}

.admin-nav a:hover, .admin-nav a.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
}

.data-table {
    width: 100%;
    background: var(--bg-color);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 9px 9px 16px var(--shadow-dark), -9px -9px 16px var(--shadow-light);
    overflow-x: auto;
}

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

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #cbd5e0;
}

th {
    font-weight: 600;
    color: var(--primary-color);
}

.btn-group {
    display: flex;
    gap: 10px;
}

.btn-sm {
    padding: 8px 15px;
    font-size: 14px;
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.login-box {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background: var(--bg-color);
    border-radius: 25px;
    box-shadow: 15px 15px 30px var(--shadow-dark), -15px -15px 30px var(--shadow-light);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .tasks-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 10% 20px;
        padding: 30px 20px;
    }
}