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

body {
    font-family: 'Orbitron', 'Courier New', monospace;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at center, #1a0033 0%, #000000 70%);
}

/* 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(100, 50, 200, 0.3);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px rgba(100, 50, 200, 0.3);
}

.back-button:hover {
    background: rgba(100, 50, 200, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(100, 50, 200, 0.5);
}

/* 星际背景 */
.stellar-background {
    position: fixed;
    width: 100vw;
    height: 100vh;
    top: 0;
    left: 0;
    z-index: -1;
    overflow: hidden;
}

/* 星系 */
.galaxy {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    animation: galaxyRotate 60s linear infinite;
}

.galaxy-1 {
    top: 10%;
    right: 10%;
    opacity: 0.6;
}

.galaxy-2 {
    bottom: 20%;
    left: 15%;
    width: 200px;
    height: 200px;
    opacity: 0.4;
    animation-duration: 80s;
    animation-direction: reverse;
}

.galaxy-core {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    background: radial-gradient(circle, #ffffff 0%, #ffaa00 50%, #ff6600 100%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 30px #ffaa00;
    animation: pulse 3s ease-in-out infinite;
}

.galaxy-arm {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150px;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 170, 0, 0.8) 30%, rgba(255, 170, 0, 0.3) 70%, transparent 100%);
    transform-origin: 0 50%;
    border-radius: 2px;
}

.arm-1 { transform: translate(0, -50%) rotate(0deg); }
.arm-2 { transform: translate(0, -50%) rotate(120deg); }
.arm-3 { transform: translate(0, -50%) rotate(240deg); }

/* 行星轨道 */
.planet-orbit {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: orbitRotate linear infinite;
}

.orbit-1 {
    width: 400px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 30s;
}

.orbit-2 {
    width: 600px;
    height: 600px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 45s;
}

.orbit-3 {
    width: 800px;
    height: 800px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 60s;
}

.planet {
    position: absolute;
    border-radius: 50%;
    top: -5px;
    left: -5px;
}

.planet-1 {
    width: 10px;
    height: 10px;
    background: radial-gradient(circle, #4a90e2 0%, #2171b5 100%);
    box-shadow: 0 0 10px #4a90e2;
}

.planet-2 {
    width: 8px;
    height: 8px;
    background: radial-gradient(circle, #e74c3c 0%, #c0392b 100%);
    box-shadow: 0 0 8px #e74c3c;
}

.planet-3 {
    width: 6px;
    height: 6px;
    background: radial-gradient(circle, #f39c12 0%, #e67e22 100%);
    box-shadow: 0 0 6px #f39c12;
}

/* 星星 */
.stars {
    position: absolute;
    width: 100%;
    height: 100%;
}

.star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: #ffffff;
    border-radius: 50%;
    animation: twinkle 2s ease-in-out infinite;
}

.star:nth-child(1) { top: 20%; left: 30%; animation-delay: 0s; }
.star:nth-child(2) { top: 40%; left: 70%; animation-delay: 0.5s; }
.star:nth-child(3) { top: 60%; left: 20%; animation-delay: 1s; }
.star:nth-child(4) { top: 80%; left: 80%; animation-delay: 1.5s; }
.star:nth-child(5) { top: 10%; left: 60%; animation-delay: 2s; }
.star:nth-child(6) { top: 30%; left: 90%; animation-delay: 0.3s; }
.star:nth-child(7) { top: 70%; left: 40%; animation-delay: 0.8s; }
.star:nth-child(8) { top: 90%; left: 10%; animation-delay: 1.3s; }
.star:nth-child(9) { top: 50%; left: 50%; animation-delay: 1.8s; }
.star:nth-child(10) { top: 15%; left: 85%; animation-delay: 0.2s; }

/* 流星 */
.meteors {
    position: absolute;
    width: 100%;
    height: 100%;
}

.meteor {
    position: absolute;
    width: 2px;
    height: 2px;
    background: linear-gradient(45deg, #ffffff 0%, transparent 70%);
    border-radius: 50%;
    animation: meteorFall 3s linear infinite;
}

.meteor:nth-child(1) {
    top: 10%;
    left: 90%;
    animation-delay: 0s;
}

.meteor:nth-child(2) {
    top: 30%;
    left: 80%;
    animation-delay: 1s;
}

.meteor:nth-child(3) {
    top: 50%;
    left: 70%;
    animation-delay: 2s;
}

/* 太空尘埃 */
.space-dust {
    position: absolute;
    width: 100%;
    height: 100%;
}

.dust-particle {
    position: absolute;
    width: 1px;
    height: 1px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: dustFloat 8s ease-in-out infinite;
}

.dust-particle:nth-child(1) { top: 25%; left: 15%; animation-delay: 0s; }
.dust-particle:nth-child(2) { top: 45%; left: 35%; animation-delay: 2s; }
.dust-particle:nth-child(3) { top: 65%; left: 55%; animation-delay: 4s; }
.dust-particle:nth-child(4) { top: 85%; left: 75%; animation-delay: 6s; }
.dust-particle:nth-child(5) { top: 35%; left: 85%; animation-delay: 1s; }

/* 表单容器 */
.login-container {
    position: relative;
    z-index: 100;
    width: 90%;
    max-width: 400px;
    margin: 0 auto;
}

.space-capsule {
    background: linear-gradient(135deg, rgba(30, 30, 60, 0.9) 0%, rgba(10, 10, 30, 0.95) 100%);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(100, 50, 200, 0.3);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 
        0 0 50px rgba(100, 50, 200, 0.3),
        inset 0 0 50px rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.space-capsule::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(100, 50, 200, 0.8) 50%, transparent 100%);
    animation: scanLine 3s ease-in-out infinite;
}

.capsule-header {
    text-align: center;
    margin-bottom: 30px;
}

.status-lights {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 15px;
}

.status-light {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.status-light.active {
    background: #00ff88;
    box-shadow: 0 0 15px #00ff88;
    animation: statusBlink 2s ease-in-out infinite;
}

.capsule-header h2 {
    color: #ffffff;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.subtitle {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    font-weight: 300;
}

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

.form-group input {
    width: 100%;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(100, 50, 200, 0.3);
    border-radius: 10px;
    color: #ffffff;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.form-group input:focus {
    outline: none;
    border-color: #00ff88;
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
    background: rgba(255, 255, 255, 0.1);
}

.form-group label {
    position: absolute;
    top: 15px;
    left: 20px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 16px;
    pointer-events: none;
    transition: all 0.3s ease;
    background: transparent;
}

.form-group input:focus + label,
.form-group input:valid + label {
    top: -8px;
    left: 15px;
    font-size: 12px;
    color: #00ff88;
    background: linear-gradient(135deg, rgba(30, 30, 60, 0.9) 0%, rgba(10, 10, 30, 0.95) 100%);
    padding: 0 8px;
    border-radius: 4px;
}

/* 按钮样式 */
.login-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #6432c8 0%, #4a90e2 100%);
    border: none;
    border-radius: 10px;
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    margin-bottom: 20px;
    box-shadow: 0 5px 20px rgba(100, 50, 200, 0.3);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(100, 50, 200, 0.4);
}

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

.btn-energy {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
    transition: left 0.5s ease;
}

.login-btn:hover .btn-energy {
    left: 100%;
}

.verify-btn {
    padding: 12px 16px;
    background: linear-gradient(135deg, #00ff88 0%, #0088ff 100%);
    border: none;
    border-radius: 6px;
    color: #ffffff;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.verify-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.5);
}

.verification-group {
    display: flex;
    align-items: flex-end;
    gap: 10px;
}

.verification-group input {
    flex: 1;
}

/* 链接样式 */
.additional-links {
    text-align: center;
    margin-top: 20px;
}

.additional-links a {
    color: #00ff88;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.additional-links a:hover {
    color: #ffffff;
    text-shadow: 0 0 15px rgba(0, 255, 136, 0.8);
}

.divider {
    color: rgba(255, 255, 255, 0.3);
    margin: 0 15px;
}

/* 隐藏类 */
.hidden {
    display: none;
}

/* 动画关键帧 */
@keyframes galaxyRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes orbitRotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.5); }
}

@keyframes meteorFall {
    0% {
        transform: translate(0, 0) rotate(45deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translate(-200px, 200px) rotate(45deg);
        opacity: 0;
    }
}

@keyframes dustFloat {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.3; }
    25% { transform: translateY(-20px) translateX(10px); opacity: 0.6; }
    50% { transform: translateY(-10px) translateX(-5px); opacity: 0.9; }
    75% { transform: translateY(-30px) translateX(15px); opacity: 0.4; }
}

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

@keyframes statusBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-container {
        width: 95%;
        padding: 0 10px;
    }
    
    .space-capsule {
        padding: 20px;
    }
    
    .capsule-header h2 {
        font-size: 20px;
    }
    
    .form-group input {
        padding: 12px 15px;
        font-size: 14px;
    }
    
    .form-group label {
        font-size: 14px;
        top: 12px;
        left: 15px;
    }
    
    .login-btn {
        padding: 12px;
        font-size: 14px;
    }
    
    .galaxy {
        width: 200px;
        height: 200px;
    }
    
    .galaxy-2 {
        width: 150px;
        height: 150px;
    }
    
    .orbit-1, .orbit-2, .orbit-3 {
        width: 300px;
        height: 300px;
    }
}

@media (max-width: 320px) {
    .space-capsule {
        padding: 15px;
    }
    
    .verification-group {
        gap: 8px;
    }

    .verify-btn {
        padding: 10px 12px;
        font-size: 11px;
        min-width: 70px;
    }
}