/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "SF Pro Display", sans-serif;
    -webkit-tap-highlight-color: transparent;
}

/* CSS变量定义 */
:root {
    --primary: #ff7a00;
    --primary-light: #ff9500;
    --primary-dark: #ff5e00;
    --red: #ff4757;
    --bg-main: #1a1a1a;
    --bg-card: #252525;
    --text-white: #ffffff;
    --text-gray: #aaaaaa;
    --text-muted: #666666;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-card: 0 2px 10px rgba(0,0,0,0.2);
    --page-padding: 16px;
}

/* 基础样式 */
body {
    background: var(--bg-main);
    min-height: 100vh;
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--page-padding);
}

/* 容器 */
.container {
    width: 100%;
    max-width: 400px;
}

/* 页面切换 */
.page {
    display: none;
    width: 100%;
}
.page.active {
    display: block;
}

/* 卡片 */
.card {
    background: rgba(255,255,255,0.1);
    border-radius: 24px;
    padding: 30px;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

/* 卡片标题 */
.card-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-white);
    text-align: center;
}

/* 表单组 */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    color: rgba(255,255,255,0.85);
    font-size: 14px;
    font-weight: 500;
}
.form-group input {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.05);
    color: #fff;
    font-size: 16px;
    outline: none;
    transition: all 0.2s ease;
}
.form-group input::placeholder {
    color: rgba(255,255,255,0.4);
}
.form-group input:focus {
    border-color: var(--primary);
    background: rgba(255,255,255,0.1);
    box-shadow: 0 0 0 3px rgba(255,122,0,0.1);
}

/* 按钮 */
.btn {
    width: 100%;
    padding: 16px 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.2s ease;
}
.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255,122,0,0.3);
}
.btn:active {
    transform: translateY(0);
}
.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: #fff;
    margin-top: 8px;
    border: 1px solid rgba(255,255,255,0.1);
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.15);
}

/* 错误提示 */
.error {
    color: var(--red);
    font-size: 14px;
    margin-top: 10px;
    text-align: center;
}

/* 自定义提示框 */
.custom-alert {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 9999;
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
}
.custom-alert.show {
    opacity: 1;
    transform: translateY(0);
}
.alert-content {
    display: flex;
    align-items: center;
    gap: 10px;
}
.alert-icon {
    font-size: 18px;
}
.alert-text {
    font-size: 14px;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .card {
        padding: 24px;
        border-radius: 20px;
    }
    .card-title {
        font-size: 18px;
        margin-bottom: 20px;
    }
    .form-group input {
        padding: 14px;
    }
    .btn {
        padding: 14px 0;
    }
}