/* 北辰寰曜培训登记系统 - 移动优先 */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8edf5 100%);
    min-height: 100vh;
    color: #2c3e50;
    line-height: 1.6;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

.header {
    text-align: center;
    padding: 28px 0 24px;
}
.header h1 {
    font-size: 24px;
    font-weight: 700;
    color: #1a3a5c;
    margin-bottom: 8px;
}
.header .subtitle {
    color: #6b7c93;
    font-size: 14px;
}
.header .brand {
    display: inline-block;
    padding: 4px 12px;
    background: #1a3a5c;
    color: #fff;
    border-radius: 12px;
    font-size: 11px;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    margin-bottom: 16px;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: #1a3a5c;
    margin-bottom: 16px;
    padding-left: 10px;
    border-left: 3px solid #1a3a5c;
}

.form-group {
    margin-bottom: 14px;
}
.form-group label {
    display: block;
    font-size: 13px;
    color: #5a6c7d;
    margin-bottom: 6px;
    font-weight: 500;
}
.form-group label .required {
    color: #e74c3c;
    margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid #d8e1ea;
    border-radius: 8px;
    font-size: 15px;
    background: #fafbfc;
    transition: all 0.2s;
    -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1a3a5c;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.08);
}
.form-group textarea {
    resize: vertical;
    min-height: 70px;
}

.form-row {
    display: flex;
    gap: 10px;
}
.form-row .form-group {
    flex: 1;
}

.checkbox-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.checkbox-group label {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border: 1px solid #d8e1ea;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    background: #fafbfc;
}
.checkbox-group input {
    margin-right: 6px;
}
.checkbox-group input:checked + span {
    color: #1a3a5c;
    font-weight: 600;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #1a3a5c 0%, #2c5282 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
    letter-spacing: 2px;
}
.btn-submit:active {
    transform: scale(0.99);
}
.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.tip {
    background: #f0f6ff;
    border-left: 3px solid #4a90e2;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 13px;
    color: #4a6275;
    margin-bottom: 18px;
}

.footer {
    text-align: center;
    color: #95a5a6;
    font-size: 12px;
    padding: 24px 0 12px;
}

@media (max-width: 480px) {
    .container { padding: 12px 12px 32px; }
    .header h1 { font-size: 20px; }
    .card { padding: 18px; }
    .form-row { flex-direction: column; gap: 0; }
    .checkbox-group { grid-template-columns: 1fr; }
}