@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&display=swap');

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

body {
    font-family: 'Orbitron', monospace;
    background: linear-gradient(180deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* 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, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    color: #fff;
    font-family: 'Orbitron', monospace;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.back-button:hover {
    background: rgba(0, 255, 146, 0.2);
    border-color: #00ff92;
    color: #00ff92;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 255, 146, 0.3);
}

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

/* 极光背景动画 */
.aurora-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at top, rgba(0, 255, 146, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at bottom, rgba(138, 43, 226, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at left, rgba(0, 191, 255, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at right, rgba(255, 20, 147, 0.3) 0%, transparent 50%);
    animation: auroraMove 15s ease-in-out infinite;
}

@keyframes auroraMove {
    0%, 100% { 
        transform: rotate(0deg) scale(1);
        filter: hue-rotate(0deg);
    }
    25% { 
        transform: rotate(1deg) scale(1.1);
        filter: hue-rotate(90deg);
    }
    50% { 
        transform: rotate(-1deg) scale(1.05);
        filter: hue-rotate(180deg);
    }
    75% { 
        transform: rotate(0.5deg) scale(1.1);
        filter: hue-rotate(270deg);
    }
}

/* 极光波浪效果 */
.aurora-wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(0, 255, 146, 0.1) 50%,
        rgba(138, 43, 226, 0.1) 70%,
        transparent 90%
    );
    animation: waveFlow 20s linear infinite;
}

@keyframes waveFlow {
    0% { transform: translateX(-100%) skewX(-15deg); }
    100% { transform: translateX(100%) skewX(-15deg); }
}

/* 星空效果 */
.stars {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #fff, transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, #fff, transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.6), transparent),
        radial-gradient(2px 2px at 160px 30px, #fff, transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: starTwinkle 10s linear infinite;
}

@keyframes starTwinkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* 表单容器 */
.form-container {
    width: 90%;
    max-width: 420px;
    position: relative;
}

/* 极光卡片 */
.aurora-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    position: relative;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: containerFloat 6s ease-in-out infinite;
}

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

/* 极光边框效果 */
.aurora-border {
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    background: linear-gradient(
        90deg,
        rgba(0, 255, 146, 0.3),
        rgba(138, 43, 226, 0.3),
        rgba(0, 191, 255, 0.3),
        rgba(255, 20, 147, 0.3),
        rgba(0, 255, 146, 0.3)
    );
    border-radius: 21px;
    z-index: -1;
    animation: borderGlow 4s ease-in-out infinite alternate;
}

@keyframes borderGlow {
    0% {
        opacity: 0.3;
        background: linear-gradient(
            90deg,
            rgba(0, 255, 146, 0.3),
            rgba(138, 43, 226, 0.3),
            rgba(0, 191, 255, 0.3),
            rgba(255, 20, 147, 0.3),
            rgba(0, 255, 146, 0.3)
        );
    }
    100% {
        opacity: 0.6;
        background: linear-gradient(
            90deg,
            rgba(138, 43, 226, 0.4),
            rgba(0, 191, 255, 0.4),
            rgba(255, 20, 147, 0.4),
            rgba(0, 255, 146, 0.4),
            rgba(138, 43, 226, 0.4)
        );
    }
}

.form-title {
    text-align: center;
    color: #fff;
    font-size: 28px;
    font-weight: 900;
    margin-bottom: 30px;
    text-shadow: 0 0 20px rgba(0, 255, 146, 0.8);
    animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    0% { 
        text-shadow: 0 0 20px rgba(0, 255, 146, 0.8);
        color: #fff;
    }
    100% { 
        text-shadow: 0 0 30px rgba(138, 43, 226, 1);
        color: #e0e0ff;
    }
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-label {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-input {
    width: 100%;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    color: #fff;
    font-family: 'Orbitron', monospace;
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.form-input:focus {
    border-color: #00ff92;
    box-shadow: 
        0 0 20px rgba(0, 255, 146, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.1);
}

.form-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
    font-family: 'Orbitron', monospace;
}

/* 输入框极光效果 */
.input-aurora {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 10px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(0, 255, 146, 0.2),
        rgba(138, 43, 226, 0.2),
        transparent
    );
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.form-input:focus + .input-aurora {
    opacity: 1;
    animation: inputAurora 2s ease-in-out infinite;
}

@keyframes inputAurora {
    0%, 100% { transform: translateX(-100%); }
    50% { transform: translateX(100%); }
}

.aurora-button {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #00ff92, #8a2be2);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-family: 'Orbitron', monospace;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 255, 146, 0.3);
}

.aurora-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 255, 146, 0.5);
    background: linear-gradient(135deg, #8a2be2, #00bfff);
}

.aurora-button:active {
    transform: translateY(0);
}

/* 按钮极光流动效果 */
.aurora-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    transition: left 0.5s;
}

.aurora-button:hover::before {
    left: 100%;
}

.form-links {
    text-align: center;
    margin-top: 25px;
}

.link-button {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    margin: 0 15px;
    transition: all 0.3s ease;
    position: relative;
    cursor: pointer;
}

.link-button:hover {
    color: #00ff92;
    text-shadow: 0 0 10px rgba(0, 255, 146, 0.8);
}

.link-button::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, #00ff92, #8a2be2);
    transition: width 0.3s ease;
}

.link-button:hover::after {
    width: 100%;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .aurora-card {
        padding: 30px 25px;
        margin: 20px;
    }
    
    .form-title {
        font-size: 24px;
    }
    
    .form-input {
        padding: 12px 15px;
        font-size: 14px;
    }
    
    .aurora-button {
        padding: 15px;
        font-size: 14px;
    }
    
    .back-button {
        padding: 8px 12px;
        font-size: 10px;
    }
}