/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
}

/* ==================== 卡片 ==================== */
.card {
    background: #fff;
    border-radius: 16px;
    padding: 32px 28px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

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

.card-header h1 {
    font-size: 24px;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    color: #999;
}

.card-footer {
    text-align: center;
    margin-top: 15px;
    font-size: 13px;
    color: #999;
}

/* ==================== 表单 ==================== */
.form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

.form-group label {
    font-size: 15px;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.required-mark {
    color: #ff4d4f;
    font-weight: bold;
}

.form-group input {
    padding: 12px 16px;
    font-size: 15px;
    border: 1.5px solid #e0e0e0;
    border-radius: 10px;
    outline: none;
    transition: all 0.3s;
    background: #fafafa;
    color: #333;
}

.form-group input:focus {
    border-color: #1677ff;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.1);
}

.form-group input.input-error {
    border-color: #ff4d4f;
    background: #fff;
}

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

.error-msg {
    color: #ff4d4f;
    font-size: 12px;
    margin-top: 5px;
    min-height: 18px;
}

/* ==================== 提交按钮 ==================== */
.btn-submit {
    margin-top: 10px;
    padding: 14px;
    font-size: 17px;
    font-weight: bold;
    color: #fff;
    background: linear-gradient(135deg, #1677ff 0%, #0958d9 100%);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(22, 119, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(22, 119, 255, 0.4);
}

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

.btn-submit:disabled {
    background: #ccc;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ==================== 响应式 ==================== */
@media (max-width: 520px) {
    .card {
        padding: 24px 16px;
        border-radius: 12px;
    }
    .card-header h1 {
        font-size: 20px;
    }
    .form-group input {
        padding: 10px 14px;
        font-size: 14px;
    }
    .btn-submit {
        padding: 12px;
        font-size: 16px;
    }
}