/* 主题变量 */
:root{--form-text:#fff;--form-accent:#ffff7f;--form-btn:#00ffff;--form-bg:rgba(255,255,255,.1)}
body[data-theme="dark"]{--form-text:#e0e0e0;--form-accent:#a5b4fc;--form-btn:#818cf8;--form-bg:rgba(0,0,0,.75)}
body[data-theme="pink"]{--form-text:#831843;--form-accent:#f472b6;--form-btn:#ec4899;--form-bg:rgba(253,242,248,.85)}

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

body {
    background-image: url("../img/login-bg.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.5s;
}

.login-container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
}

.back-button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--form-text, white);
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    margin-bottom: 20px;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-3px);
}

.auth-forms {
    position: relative;
    width: 100%;
    min-height: 500px;
    overflow: hidden;
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 30px;
}

.form-wrapper {
    position: absolute;
    width: calc(100% - 60px);
    transition: all 0.5s ease;
    opacity: 0;
    transform: translateX(100%);
}

.form-wrapper.active {
    opacity: 1;
    transform: translateX(0);
}

.form-header {
    text-align: center;
    margin-bottom: 30px;
    color: var(--form-accent, #ffff7f);
}

.form-header h2 {
    font-size: 28px;
    font-weight: 600;
}

.input-group {
    position: relative;
    margin-bottom: 20px;
}

/* 仅左侧图标 */
.input-group > i:first-child {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--form-accent, #ffff7f);
    font-size: 16px;
    z-index: 1;
    pointer-events: none;
}

.input-group input {
    width: 100%;
    padding: 12px 15px 12px 40px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--form-text, white);
    font-size: 16px;
    transition: all 0.3s ease;
}

/* 密码类型的输入框右边留出切换按钮空间 */
.input-group input[type="password"],
.input-group input[type="text"]#login-password,
.input-group input[type="text"]#register-password {
    padding-right: 40px;
}

.input-group input:focus {
    outline: none;
    border-color: var(--form-accent, #ffff7f);
    box-shadow: 0 0 0 2px rgba(255, 255, 127, 0.2);
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

/* 密码切换按钮 — 仅对 .password-toggle 类生效 */
.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--form-accent, #ffff7f);
    cursor: pointer;
    font-size: 16px;
    z-index: 2;
    transition: color 0.2s ease;
}

.password-toggle:hover {
    color: var(--form-text, #fff);
}

.submit-btn {
    width: 100%;
    padding: 12px;
    background: var(--form-btn, #00ffff);
    color: #333;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.submit-btn:hover {
    background: var(--form-btn, #00e6e6);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 255, 255, 0.3);
}

.form-footer {
    margin-top: 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
}

.switch-form {
    color: var(--form-accent, #ffff7f);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    display: inline-block;
    margin-top: 15px;
}

.switch-form:hover {
    color: var(--form-text, white);
    text-decoration: underline;
}

.message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    font-size: 14px;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .login-container{padding:12px}
    .auth-forms{padding:20px 16px;min-height:420px}
    .form-wrapper{width:calc(100% - 32px)}
    .form-header h2{font-size:20px}.form-header{margin-bottom:20px}
    .input-group{margin-bottom:14px}.input-group input{padding:10px 12px 10px 36px;font-size:14px}
    .submit-btn{padding:10px;font-size:14px}
    .switch-form{font-size:13px}
    .back-button{padding:6px 12px;font-size:13px}
}
@media (max-width: 380px) {
    .auth-forms{padding:16px 10px}.form-header h2{font-size:18px}
    .input-group input{font-size:13px}.submit-btn{font-size:13px}
}