:root {
    --primary-color: #3498db;
    --hover-color: #2980b9;
    --background-color: #f5e6d3;  /* 浅米黄色 */
    --navbar-color: #1a2b3c;      /* 深黑蓝色 */
    --input-border: #bdc3c7;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
}

body {
    background-color: var(--background-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* 导航栏样式更新 */
.navbar-default {
    background-color: var(--navbar-color);
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    margin-bottom: 0;
    min-height: 60px;
}

/* 导航栏"天梦"鼠标悬停动画 */
.navbar-default .navbar-brand {
    color: white;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.navbar-default .navbar-brand::after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    background-color: #4a90e2; /* 更新下划线颜色，使其在深色导航栏上更显眼 */
    left: 50%;
    bottom: -5px;
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.navbar-default .navbar-brand:hover::after {
    width: 100%;
}

/* 主内容区样式 */
.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 52px);
    display: flex;
    align-items: center;
}

.registration-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 30px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    transform: translateY(0);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.registration-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.15);
}

.form-title {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
    font-weight: 600;
}

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

.form-group label {
    font-weight: 500;
    color: #34495e;
    margin-bottom: 8px;
    display: block;
}

.form-control {
    height: 45px;
    border: 2px solid var(--input-border);
    border-radius: 6px;
    padding: 8px 15px;
    font-size: 15px;
    transition: all 0.3s ease;
    box-shadow: none;
    width: 100%;
}

.email-input-container, .input-group {
    width: 100%;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.error-message {
    color: var(--error-color);
    font-size: 13px;
    margin-top: 5px;
    display: none;
    animation: fadeIn 0.3s ease;
}

.email-input-container {
    display: flex;
    gap: 12px;
}

.verification-code-btn {
    padding: 0 20px;
    background-color: var(--primary-color);
    border: none;
    border-radius: 6px;
    color: white;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    min-width: 120px;
    transition: all 0.3s ease;
}

.verification-code-btn:hover:not(:disabled) {
    background-color: var(--hover-color);
    transform: translateY(-1px);
}

.verification-code-btn:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
    opacity: 0.7;
}

.verification-code-container {
    display: none;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.verification-code-container.visible {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.btn-register {
    width: 100%;
    height: 45px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    margin-top: 30px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-register:hover:not(:disabled) {
    background-color: var(--hover-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-register:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
    opacity: 0.7;
}

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--input-border);
    transition: all 0.3s ease;
}

.form-control:focus + .input-icon {
    color: var(--primary-color);
}

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

.loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -10px 0 0 -10px;
}

.btn-register.loading .loading-spinner {
    display: block;
}

.btn-register.loading span {
    visibility: hidden;
}

@media (max-width: 576px) {
    .registration-container {
        margin: 15px;
        padding: 20px;
    }

    .email-input-container {
        flex-direction: column;
    }

    .verification-code-btn {
        height: 45px;
        width: 100%;
    }
}