/* 日落余晖风格 - Sunset Glow Style */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* 返回按钮 */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 126, 95, 0.3);
    border-radius: 25px;
    color: #ff7e5f;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(255, 126, 95, 0.2);
}

.back-button:hover {
    background: rgba(255, 126, 95, 0.1);
    border-color: #ff7e5f;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 126, 95, 0.3);
}

.back-button svg {
    width: 18px;
    height: 18px;
}

.container {
    width: 100%;
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 背景渐变 - 日落色调 */
.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #ff6b6b 0%, #ffa502 25%, #ff7979 50%, #ff6348 75%, #ee5a6f 100%);
    overflow: hidden;
}

/* 太阳动画 */
.sun {
    position: absolute;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, #ffeb3b 0%, #ff9800 70%);
    border-radius: 50%;
    top: 20%;
    right: 10%;
    box-shadow: 0 0 100px rgba(255, 235, 59, 0.8);
    animation: sunGlow 4s ease-in-out infinite;
}

@keyframes sunGlow {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 100px rgba(255, 235, 59, 0.8);
    }
    50% {
        transform: scale(1.1);
        box-shadow: 0 0 150px rgba(255, 235, 59, 1);
    }
}

/* 云朵动画 */
.cloud {
    position: absolute;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 100px;
    opacity: 0.8;
}

.cloud::before,
.cloud::after {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 100px;
}

.cloud1 {
    width: 100px;
    height: 40px;
    top: 15%;
    left: 20%;
    animation: float 20s infinite;
}

.cloud1::before {
    width: 50px;
    height: 50px;
    top: -25px;
    left: 10px;
}

.cloud1::after {
    width: 60px;
    height: 40px;
    top: -15px;
    right: 10px;
}

.cloud2 {
    width: 80px;
    height: 35px;
    top: 25%;
    left: 60%;
    animation: float 25s infinite;
}

.cloud2::before {
    width: 40px;
    height: 40px;
    top: -20px;
    left: 15px;
}

.cloud2::after {
    width: 50px;
    height: 35px;
    top: -10px;
    right: 15px;
}

.cloud3 {
    width: 90px;
    height: 30px;
    top: 40%;
    left: 10%;
    animation: float 30s infinite;
}

.cloud4 {
    width: 70px;
    height: 25px;
    top: 60%;
    right: 20%;
    animation: float 22s infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateX(0) translateY(0);
    }
    25% {
        transform: translateX(20px) translateY(-10px);
    }
    50% {
        transform: translateX(-10px) translateY(5px);
    }
    75% {
        transform: translateX(15px) translateY(-5px);
    }
}

/* 飞鸟动画 */
.bird {
    position: absolute;
    font-size: 20px;
    animation: fly 15s linear infinite;
}

.bird1 {
    top: 30%;
    animation-delay: 0s;
}

.bird2 {
    top: 50%;
    animation-delay: 7s;
}

.bird::before {
    content: '🦅';
}

@keyframes fly {
    0% {
        left: -50px;
        transform: translateY(0);
    }
    25% {
        transform: translateY(-20px);
    }
    50% {
        transform: translateY(10px);
    }
    75% {
        transform: translateY(-15px);
    }
    100% {
        left: calc(100% + 50px);
        transform: translateY(0);
    }
}

/* 登录容器样式 */
.login-container,
.register-container,
.forgot-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 10;
    display: block;
    animation: slideIn 0.5s ease-out;
}

.login-container.hidden,
.register-container.hidden,
.forgot-container.hidden {
    display: none;
}

.login-container.active,
.register-container.active,
.forgot-container.active {
    display: block;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 表单标题 */
.form-title {
    text-align: center;
    color: #ff6348;
    font-size: 28px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.sunset-icon {
    font-size: 32px;
    animation: iconBounce 2s ease-in-out infinite;
}

@keyframes iconBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

.form-subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 14px;
}

/* 表单组 */
.form-group {
    position: relative;
    margin-bottom: 25px;
}

.form-group input {
    width: 100%;
    padding: 12px 0;
    font-size: 16px;
    border: none;
    border-bottom: 2px solid transparent;
    background: transparent;
    outline: none;
    transition: all 0.3s;
    color: #333;
}

.form-group label {
    position: absolute;
    top: 12px;
    left: 0;
    font-size: 16px;
    color: #999;
    pointer-events: none;
    transition: all 0.3s;
}

.input-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, #ff6348, #ffa502);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.form-group input:focus ~ .input-line,
.form-group input:not(:placeholder-shown) ~ .input-line {
    transform: scaleX(1);
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label {
    transform: translateY(-25px);
    font-size: 12px;
    color: #ff6348;
}

/* 验证码组 */
.verification-group {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.verification-group input {
    flex: 1;
}

.send-code-btn {
    padding: 10px 15px;
    background: linear-gradient(135deg, #ff6348, #ffa502);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    white-space: nowrap;
    transition: all 0.3s;
}

.send-code-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 99, 72, 0.4);
}

.send-code-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* 表单选项 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: #666;
    font-size: 14px;
}

.remember-me input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid #ff6348;
    border-radius: 4px;
    position: relative;
    transition: all 0.3s;
}

.remember-me input:checked ~ .checkmark {
    background: linear-gradient(135deg, #ff6348, #ffa502);
}

.remember-me input:checked ~ .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
}

.forgot-password {
    color: #ff6348;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.forgot-password:hover {
    color: #ffa502;
}

/* 提交按钮 */
.submit-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #ff6348, #ffa502);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 99, 72, 0.4);
}

.btn-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.5s;
}

.submit-btn:hover .btn-glow {
    transform: translate(-50%, -50%) scale(2);
}

/* 分隔线 */
.divider {
    text-align: center;
    margin: 25px 0;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: #ddd;
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.divider span {
    color: #999;
    padding: 0 15px;
    background: rgba(255, 255, 255, 0.95);
}

/* 社交登录 */
.social-login {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.social-btn {
    flex: 1;
    padding: 10px;
    background: white;
    border: 2px solid #ff6348;
    border-radius: 10px;
    color: #ff6348;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all 0.3s;
}

.social-btn:hover {
    background: linear-gradient(135deg, #ff6348, #ffa502);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
}

/* 切换表单 */
.switch-form {
    text-align: center;
    color: #666;
    font-size: 14px;
}

.switch-form a {
    color: #ff6348;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.switch-form a:hover {
    color: #ffa502;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-container,
    .register-container,
    .forgot-container {
        padding: 30px 25px;
        width: 95%;
    }
    
    .form-title {
        font-size: 24px;
    }
    
    .sun {
        width: 80px;
        height: 80px;
    }
    
    .cloud {
        transform: scale(0.8);
    }
}