/* --- 基础变量定义 --- */
:root {
    --primary-color: #0665d0;
    --primary-hover: #2a84de;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --text-main: #1d1d1f;
    --text-sub: #86868b;
    --input-bg: rgba(0, 0, 0, 0.05);
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    
    /* 新增：状态颜色 */
    --success-color: #34c759;
    --error-color: #ff3b30;
}

/* 深色模式变量 */
.dark-mode {
    --bg-gradient: linear-gradient(135deg, #1a1a1c 0%, #000000 100%);
    --glass-bg: rgba(28, 28, 30, 0.8);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f5f5f7;
    --text-sub: #a1a1a6;
    --input-bg: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
}

/* --- 全局重置 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-gradient);
    overflow: hidden;
    position: relative;
    padding: 20px;
    transition: background 0.5s ease;
}

/* --- 背景动感装饰 (Blob) --- */
.blob {
    position: absolute;
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    filter: blur(80px);
    opacity: 0.15;
    z-index: 0;
    border-radius: 50%;
    pointer-events: none;
}
.blob-1 { top: -100px; left: -100px; animation: move 20s infinite alternate; }
.blob-2 { bottom: -100px; right: -100px; animation: move 25s infinite alternate-reverse; }

@keyframes move {
    from { transform: translate(0, 0); }
    to { transform: translate(100px, 150px); }
}

/* --- 容器布局 --- */
.container {
    width: 100%;
    max-width: 400px;
    z-index: 10;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding: 0 8px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.logo span {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
}

/* --- 玻璃卡片主体 --- */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--card-shadow);
}

/* --- 表单切换动画 --- */
.auth-form {
    display: none;
    flex-direction: column;
    gap: 20px;
}

.auth-form.active {
    display: flex;
    animation: fadeIn 0.4s ease-out;
}

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

.form-header {
    text-align: center;
    margin-bottom: 10px;
}

.form-header h2 {
    font-size: 24px;
    color: var(--text-main);
    margin-bottom: 8px;
}

.form-header p {
    font-size: 14px;
    color: var(--text-sub);
}

/* --- 输入框样式 --- */
.input-group {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--input-bg);
    border-radius: 12px;
    transition: 0.3s;
    border: 1px solid transparent; /* 预留边框位防止抖动 */
}

.input-group:focus-within {
    background: transparent;
    box-shadow: 0 0 0 2px var(--primary-color);
}

.input-group input {
    background: transparent !important;
    border: none !important;
}

input[type="text"], 
input[type="password"] {
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid transparent;
    background: var(--input-bg);
    color: var(--text-main);
    font-size: 16px;
    outline: none;
    transition: 0.3s;
}

input:focus {
    background: transparent;
    box-shadow: 0 0 0 2px var(--primary-color);
}

/* 新增：输入错误时的抖动效果 */
.shake {
    animation: shakeAnim 0.4s ease-in-out;
    box-shadow: 0 0 0 2px var(--error-color) !important;
}

@keyframes shakeAnim {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.input-suffix {
    padding-right: 16px;
    color: var(--text-sub);
    font-size: 14px;
    white-space: nowrap;
}

/* 验证码行布局 */
.input-row {
    display: flex;
    gap: 12px;
}

.input-row input {
    flex: 1;
}

/* --- 按钮样式 --- */
.btn-primary {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: none;
    background: var(--primary-color);
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-small {
    padding: 0 16px;
    border-radius: 10px;
    border: none;
    background: var(--primary-color);
    color: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}

/* --- 链接与文字 --- */
.form-actions {
    display: flex;
    justify-content: flex-end;
}

.form-footer {
    text-align: center;
    margin-top: 10px;
    font-size: 14px;
    color: var(--text-sub);
}

.link-btn {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    margin-left: 5px;
    cursor: pointer;
}

.link-btn:hover {
    text-decoration: underline;
}

/* --- 主题切换按钮 --- */
.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
}

/* --- 加载动画 --- */
.spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

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

.loading .spinner { display: block; }
.loading span { display: none; }

/* --- 新增：精美 Toast 系统 --- */
#toast-container {
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

.toast {
    min-width: 280px;
    max-width: 90vw;
    padding: 14px 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-main);
    font-size: 15px;
    font-weight: 500;
    pointer-events: auto;
    /* 苹果风格的物理回弹弹出动画 */
    animation: toastBounceIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    transition: opacity 0.3s, transform 0.3s;
}

.toast.hide {
    opacity: 0;
    transform: scale(0.9);
}

.toast i {
    font-size: 20px;
}

/* 不同状态的图标颜色 */
.toast-success i { color: var(--success-color); }
.toast-error i { color: var(--error-color); }
.toast-info i { color: var(--primary-color); }

@keyframes toastBounceIn {
    from { opacity: 0; transform: translateY(-30px) scale(0.9); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- 响应式微调 --- */
@media (max-width: 480px) {
    .glass-card {
        padding: 24px;
    }
    
    body {
        align-items: flex-start;
        padding-top: 10vh;
    }
}