:root {
    --primary-color: #ff6a00;
    --secondary-color: #ff9d00;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
    --gray-color: #6c757d;
    --white-color: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    --border-radius: 10px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f5f5;
    background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.card {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 20px;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white-color);
    text-align: center;
    padding: 25px 20px;
    position: relative;
}

.logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 10px;
}

h1 {
    font-size: 1.5rem;
    margin: 0;
    font-weight: 600;
}

.progress-container {
    padding: 20px;
    position: relative;
}

.progress-bar {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-bottom: 30px;
    max-width: 400px;
    margin: 0 auto;
}

.progress-bar::before {
    content: '';
    background-color: #e9ecef;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 100%;
    z-index: 0;
}

.progress {
    background-color: var(--primary-color);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 0%;
    z-index: 1;
    transition: var(--transition);
}

.progress-step {
    width: 35px;
    height: 35px;
    background-color: #e9ecef;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--gray-color);
    z-index: 2;
    position: relative;
    transition: var(--transition);
}

.progress-step.active {
    background-color: var(--primary-color);
    color: var(--white-color);
}

.progress-step.completed {
    background-color: var(--success-color);
    color: var(--white-color);
}

.steps-content {
    padding: 20px;
}

.step-content {
    display: none;
    animation: fadeIn 0.5s;
}

.step-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h2 {
    color: var(--dark-color);
    margin-bottom: 10px;
    font-size: 1.5rem;
    text-align: center;
}

.step-description {
    color: var(--gray-color);
    text-align: center;
    margin-bottom: 25px;
    font-size: 0.95rem;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark-color);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ced4da;
    border-radius: 5px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 106, 0, 0.25);
}

/* 输入框验证状态 */
.form-control.is-valid {
    border-color: var(--success-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px 16px;
    padding-right: 40px;
}

.form-control.is-valid:focus {
    border-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.25);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23dc3545'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23dc3545' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px 16px;
    padding-right: 40px;
}

.form-control.is-invalid:focus {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25);
}

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

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

.code-input-group .form-control {
    flex: 1;
}

.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 12px 25px;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 5px;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    color: var(--white-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 7px 14px rgba(50, 50, 93, 0.1), 0 3px 6px rgba(0, 0, 0, 0.08);
}

.btn-secondary {
    color: var(--dark-color);
    background-color: #e9ecef;
    border-color: #e9ecef;
}

.btn-secondary:hover {
    background-color: #dde2e6;
    border-color: #dde2e6;
}

.btn-outline {
    color: var(--primary-color);
    background-color: transparent;
    border-color: var(--primary-color);
}

.btn-outline:hover {
    color: var(--white-color);
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* 按钮禁用状态优化 */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
    background: #b0b0b0 !important;
    border-color: #b0b0b0 !important;
    color: #fff !important;
}

.btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* 加载中按钮动画 */
.btn.loading {
    position: relative;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: #fff;
    border-radius: 50%;
    animation: button-spin 0.8s linear infinite;
}

.btn-group {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.alert {
    padding: 10px 0;
    margin-top: 15px;
    border-radius: 5px;
    font-size: 0.9rem;
    text-align: center;
    display: none;
}

.alert.show {
    display: block;
    animation: fadeIn 0.3s;
}

.alert-success {
    color: var(--success-color);
}

.alert-danger {
    color: var(--danger-color);
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    border-radius: 5px;
    padding: 10px 15px;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border: 1px solid #bee5eb;
    border-radius: 5px;
    padding: 10px 15px;
}

.success-icon {
    text-align: center;
    font-size: 5rem;
    color: var(--success-color);
    margin: 20px 0;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(0.95);
    }
}

.result-details {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    color: var(--gray-color);
    font-weight: 500;
}

.result-value {
    color: var(--dark-color);
    font-weight: 600;
}

.result-description {
    color: var(--success-color);
    text-align: center;
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 20px;
}

.footer {
    text-align: center;
    color: var(--gray-color);
    font-size: 0.8rem;
    margin-top: 10px;
}

/* 全局加载遮罩 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes button-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    color: var(--gray-color);
    font-size: 1rem;
}

/* 震动动画（错误提示） */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* 成功打勾动画 */
@keyframes checkmark {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.success-checkmark {
    animation: checkmark 0.5s ease-in-out;
}

/* 输入框悬浮提示 */
.input-hint {
    font-size: 0.8rem;
    color: var(--gray-color);
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.input-hint i {
    font-size: 0.75rem;
}

.input-hint.success {
    color: var(--success-color);
}

.input-hint.error {
    color: var(--danger-color);
}

/* 步骤切换过渡优化 */
.step-content {
    display: none;
    animation: slideIn 0.4s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 倒计时进度环 */
.countdown-ring {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.countdown-ring svg {
    transform: rotate(-90deg);
}

.countdown-ring circle {
    fill: none;
    stroke-width: 2;
}

.countdown-ring .bg {
    stroke: #e9ecef;
}

.countdown-ring .progress-ring {
    stroke: var(--primary-color);
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear;
}

/* 成功页面下一步引导 */
.next-steps {
    margin-top: 25px;
    padding: 15px;
    background: linear-gradient(135deg, #fff6f0 0%, #fff0e6 100%);
    border-radius: 8px;
    border: 1px solid #ffe0cc;
}

.next-steps h3 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.next-steps p {
    color: var(--gray-color);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

.next-steps ol {
    margin: 10px 0 0;
    padding-left: 20px;
    color: var(--dark-color);
    font-size: 0.9rem;
    line-height: 1.8;
}

/* 网络错误重试 */
.retry-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-top: 15px;
}

.btn-retry {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 0.9rem;
    background-color: var(--light-color);
    color: var(--dark-color);
    border: 1px solid #ced4da;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-retry:hover {
    background-color: #e9ecef;
    border-color: #adb5bd;
}

/* 离线状态提示 */
.offline-banner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 10px;
    background-color: var(--danger-color);
    color: white;
    text-align: center;
    font-size: 0.9rem;
    z-index: 10000;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
}

.offline-banner.show {
    transform: translateY(0);
}

/* Tooltip 提示 */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 12px;
    background-color: var(--dark-color);
    color: white;
    font-size: 0.8rem;
    border-radius: 5px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    z-index: 100;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* Toast 动画 */
@keyframes toastIn {
    from {
        opacity: 0;
        transform: translate(-50%, -20px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translate(-50%, 0);
    }
    to {
        opacity: 0;
        transform: translate(-50%, -20px);
    }
}

/* 按钮点击反馈 */
.btn:active:not(:disabled) {
    transform: scale(0.98);
}

/* 输入框聚焦动画 */
.form-control {
    transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
}

/* 进度步骤点击态优化 */
.progress-step {
    cursor: default;
    user-select: none;
}

/* 链接样式 */
.next-steps a {
    text-decoration: none;
    transition: opacity 0.2s;
}

.next-steps a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .card-header {
        padding: 20px 15px;
    }
    
    .logo {
        width: 60px;
        height: 60px;
    }
    
    h1 {
        font-size: 1.3rem;
    }
    
    .btn {
        padding: 10px 20px;
    }
    
    .code-input-group {
        flex-direction: column;
    }
    
    .progress-step {
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }
}