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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: #f5f5f5;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 480px;
    margin: 0 auto;
}

.form-card {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    padding: 30px 24px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 24px;
}

.title {
    font-size: 24px;
    font-weight: bold;
    color: #d32f2f;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 16px;
    color: #666;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.description {
    font-size: 13px;
    color: #888;
    line-height: 1.8;
    text-align: left;
}

.confidential {
    color: #d32f2f;
    font-weight: 500;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 2px solid #eee;
    margin-bottom: 24px;
}

.tab {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: transparent;
    font-size: 15px;
    color: #666;
    cursor: pointer;
    position: relative;
    transition: color 0.3s;
}

.tab.active {
    color: #d32f2f;
    font-weight: 500;
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 2px;
    background: #d32f2f;
}

.tab:hover:not(.active) {
    color: #333;
}

/* Form */
.form {
    display: none;
}

.form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: #333;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 15px;
    color: #333;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input::placeholder {
    color: #aaa;
}

.form-group input:focus {
    outline: none;
    border-color: #d32f2f;
    box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.1);
}

/* Buttons */
.btn {
    width: 100%;
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-submit {
    background: #d32f2f;
    color: #fff;
}

.btn-submit:hover {
    background: #c62828;
    box-shadow: 0 4px 12px rgba(211, 47, 47, 0.3);
}

.btn-submit:active {
    transform: scale(0.98);
}

.btn-view {
    background: #1976d2;
    color: #fff;
}

.btn-view:hover {
    background: #1565c0;
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
}

.btn-view:active {
    transform: scale(0.98);
}

/* Admin Section */
.admin-section {
    margin-top: 30px;
    padding: 20px;
    border: 2px dashed #ddd;
    border-radius: 10px;
}

.admin-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 14px;
    color: #4caf50;
    font-weight: 500;
}

.admin-icon {
    font-size: 18px;
}

.admin-form {
    display: flex;
    gap: 12px;
}

.admin-form input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
}

.admin-form input:focus {
    outline: none;
    border-color: #4caf50;
}

.btn-admin {
    padding: 12px 20px;
    background: #4caf50;
    color: #fff;
    white-space: nowrap;
}

.btn-admin:hover {
    background: #43a047;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.btn-admin:active {
    transform: scale(0.98);
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .form-card {
        padding: 24px 16px;
    }

    .title {
        font-size: 20px;
    }

    .subtitle {
        font-size: 14px;
    }

    .admin-form {
        flex-direction: column;
    }

    .btn-admin {
        width: 100%;
    }
}