/* 自然森林风格 - Nature Forest 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(86, 171, 47, 0.3);
    border-radius: 25px;
    color: #56ab2f;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(86, 171, 47, 0.2);
}

.back-button:hover {
    background: rgba(86, 171, 47, 0.1);
    border-color: #56ab2f;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(86, 171, 47, 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 - 森林色调 */
.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #134e5e 0%, #71b280 50%, #27ae60 100%);
    overflow: hidden;
}

/* 树木装饰 */
.tree {
    position: absolute;
    bottom: 0;
    width: 0;
    height: 0;
    border-style: solid;
}

.tree::before {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 40px;
    background: #795548;
}

.tree1 {
    left: 10%;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-bottom: 120px solid rgba(46, 125, 50, 0.8);
}

.tree2 {
    right: 15%;
    border-left: 30px solid transparent;
    border-right: 30px solid transparent;
    border-bottom: 100px solid rgba(76, 175, 80, 0.8);
}

/* 树叶飘落动画 */
.leaf {
    position: absolute;
    font-size: 24px;
    animation: falling 10s linear infinite;
}

.leaf1 {
    left: 10%;
    animation-delay: 0s;
    animation-duration: 8s;
}

.leaf2 {
    left: 30%;
    animation-delay: 2s;
    animation-duration: 10s;
}

.leaf3 {
    left: 50%;
    animation-delay: 4s;
    animation-duration: 9s;
}

.leaf4 {
    left: 70%;
    animation-delay: 1s;
    animation-duration: 11s;
}

.leaf5 {
    left: 90%;
    animation-delay: 3s;
    animation-duration: 7s;
}

@keyframes falling {
    0% {
        top: -50px;
        transform: translateX(0) rotate(0deg);
        opacity: 1;
    }
    25% {
        transform: translateX(20px) rotate(90deg);
    }
    50% {
        transform: translateX(-15px) rotate(180deg);
    }
    75% {
        transform: translateX(25px) rotate(270deg);
    }
    100% {
        top: 100vh;
        transform: translateX(0) rotate(360deg);
        opacity: 0.3;
    }
}

/* 蝴蝶动画 */
.butterfly {
    position: absolute;
    font-size: 28px;
    animation: flutter 15s ease-in-out infinite;
}

.butterfly1 {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.butterfly2 {
    top: 40%;
    right: 25%;
    animation-delay: 7s;
}

@keyframes flutter {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(100px, -50px) rotate(10deg);
    }
    50% {
        transform: translate(150px, 20px) rotate(-10deg);
    }
    75% {
        transform: translate(50px, -30px) rotate(5deg);
    }
}

/* 登录容器样式 */
.login-container,
.register-container,
.forgot-container {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(15px);
    border-radius: 25px;
    padding: 40px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 10;
    display: block;
    animation: growIn 0.6s ease-out;
    border: 2px solid rgba(76, 175, 80, 0.2);
}

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

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

@keyframes growIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 表单标题 */
.form-title {
    text-align: center;
    color: #27ae60;
    font-size: 28px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.forest-icon {
    font-size: 36px;
    animation: sway 3s ease-in-out infinite;
}

@keyframes sway {
    0%, 100% {
        transform: rotate(-5deg);
    }
    50% {
        transform: rotate(5deg);
    }
}

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

/* 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, #27ae60, #71b280);
    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: #27ae60;
}

/* 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, #27ae60, #71b280);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    white-space: nowrap;
    transition: all 0.3s;
}

.send-code-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(39, 174, 96, 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 #27ae60;
    border-radius: 4px;
    position: relative;
    transition: all 0.3s;
}

.remember-me input:checked ~ .checkmark {
    background: linear-gradient(135deg, #27ae60, #71b280);
}

.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: #27ae60;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.forgot-password:hover {
    color: #71b280;
    text-decoration: underline;
}

/* 提交按钮 */
.submit-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #27ae60, #71b280);
    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(39, 174, 96, 0.4);
}

.btn-leaves {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y="50" font-size="30">🍃</text></svg>') no-repeat center;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0.5;
    transition: all 0.5s;
}

.submit-btn:hover .btn-leaves {
    transform: translate(-50%, -50%) scale(3);
    opacity: 0;
}

/* 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: linear-gradient(90deg, transparent, #27ae60, transparent);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.divider span {
    color: #27ae60;
    padding: 0 15px;
    background: rgba(255, 255, 255, 0.92);
    font-size: 20px;
}

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

.social-btn {
    flex: 1;
    padding: 10px;
    background: white;
    border: 2px solid #27ae60;
    border-radius: 12px;
    color: #27ae60;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all 0.3s;
}

.social-btn:hover {
    background: linear-gradient(135deg, #27ae60, #71b280);
    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: #27ae60;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.switch-form a:hover {
    color: #71b280;
    text-decoration: underline;
}

/* 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;
    }
    
    .tree {
        transform: scale(0.7);
    }
    
    .leaf {
        font-size: 18px;
    }
    
    .butterfly {
        display: none;
    }
}