/* 赛博朋克霓虹风格样式 - 重新设计版本 */
:root {
    --neon-cyan: #00FFFF;
    --neon-pink: #FF00FF;
    --neon-green: #00FF00;
    --neon-purple: #8A2BE2;
    --cyber-dark: #0D1117;
    --cyber-card: #1C2128;
    --cyber-input: #21262D;
    --text-primary: #F0F6FC;
    --text-secondary: #7D8590;
    --neon-glow: rgba(0, 255, 255, 0.6);
    --pink-glow: rgba(255, 0, 255, 0.6);
    --green-glow: rgba(0, 255, 0, 0.6);
}

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

body {
    font-family: "Courier New", "Monaco", "Menlo", monospace;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: var(--cyber-dark);
    color: var(--text-primary);
}

/* 返回按钮 */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(0, 255, 255, 0.1);
    border: 2px solid var(--neon-cyan);
    color: var(--neon-cyan);
    padding: 10px 15px;
    border-radius: 0;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    transition: all 0.3s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.back-button:hover {
    background: rgba(0, 255, 255, 0.2);
    box-shadow: 0 0 20px var(--neon-glow);
    transform: translateX(-5px);
}

.back-icon {
    font-size: 16px;
    font-weight: bold;
}

/* 背景动画 */
.cyber-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.grid-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.neon-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.neon-particles::before,
.neon-particles::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--neon-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--neon-cyan);
    animation: particleFloat 8s ease-in-out infinite;
}

.neon-particles::before {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.neon-particles::after {
    top: 60%;
    right: 15%;
    background: var(--neon-pink);
    box-shadow: 0 0 10px var(--neon-pink);
    animation-delay: 4s;
}

@keyframes particleFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0.7; }
    50% { transform: translateY(-30px) rotate(180deg); opacity: 1; }
}

.data-stream {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(0, 255, 255, 0.03) 50%,
        transparent 100%
    );
    animation: dataFlow 15s linear infinite;
}

@keyframes dataFlow {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* 主容器 */
.login-container {
    width: 100%;
    max-width: 420px;
    margin: 0 20px;
    z-index: 10;
}

.cyber-card {
    background: var(--cyber-card);
    backdrop-filter: blur(10px);
    border: 2px solid var(--neon-cyan);
    border-radius: 8px;
    padding: 40px 30px;
    box-shadow: 
        0 0 30px var(--neon-glow),
        inset 0 0 20px rgba(0, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.cyber-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, var(--neon-cyan), var(--neon-pink), var(--neon-green), var(--neon-cyan));
    border-radius: 8px;
    z-index: -1;
    animation: borderGlow 3s ease-in-out infinite;
}

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

/* 卡片头部 */
.card-header {
    text-align: center;
    margin-bottom: 30px;
}

.cyber-logo {
    font-size: 3rem;
    margin-bottom: 15px;
    animation: logoSpin 4s ease-in-out infinite;
    filter: drop-shadow(0 0 10px var(--neon-cyan));
}

@keyframes logoSpin {
    0%, 100% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(10deg) scale(1.1); }
}

.card-header h2 {
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
    text-shadow: 0 0 10px var(--neon-glow);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.subtitle {
    color: var(--neon-pink);
    font-size: 0.9rem;
    margin-bottom: 20px;
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-shadow: 0 0 5px var(--pink-glow);
}

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

.form-group input {
    width: 100%;
    padding: 15px 12px;
    background: var(--cyber-input);
    border: 2px solid rgba(0, 255, 255, 0.3);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    font-family: inherit;
    letter-spacing: 1px;
}

.form-group input:focus {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 15px var(--neon-glow);
    background: rgba(33, 38, 45, 0.8);
}

.form-group input::placeholder {
    color: transparent;
}

.form-group label {
    position: absolute;
    left: 12px;
    top: 15px;
    color: var(--text-secondary);
    font-size: 16px;
    pointer-events: none;
    transition: all 0.3s ease;
    letter-spacing: 1px;
    background: var(--cyber-input);
    padding: 0 4px;
}

.form-group input:focus + label,
.form-group input:valid + label {
    top: -14px;
    font-size: 12px;
    color: var(--neon-cyan);
    font-weight: 600;
    text-shadow: 0 0 5px var(--neon-glow);
    background: var(--cyber-card);
}

.neon-line {
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.form-group input:focus ~ .neon-line {
    width: 100%;
}

/* 验证码组 */
.verification-group {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    width: 100%;
    margin-bottom: 25px;
}

.verification-group .form-group {
    flex: 1;
    min-width: 0;
    margin-bottom: 0;
}

.verify-btn {
    padding: 15px 16px;
    background: linear-gradient(135deg, var(--cyber-input), var(--neon-purple));
    border: 2px solid var(--neon-purple);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    font-family: inherit;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
    min-width: 90px;
    height: 51px;
}

.verify-btn:hover {
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-pink));
    box-shadow: 0 0 20px rgba(138, 43, 226, 0.6);
    transform: translateY(-2px);
}

/* 登录按钮 */
.login-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--cyber-input), var(--neon-cyan));
    border: 2px solid var(--neon-cyan);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    margin: 20px 0;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: inherit;
}

.login-btn:hover {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-green));
    box-shadow: 0 0 30px var(--neon-glow);
    transform: translateY(-2px);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

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

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

.cyber-link {
    color: var(--neon-cyan);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    font-weight: 600;
    letter-spacing: 1px;
    text-shadow: 0 0 3px var(--neon-glow);
}

.cyber-link:hover {
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--pink-glow);
}

.divider {
    color: var(--neon-green);
    margin: 0 15px;
    font-weight: bold;
    text-shadow: 0 0 5px var(--green-glow);
}

/* 隐藏和显示动画 */
.hidden {
    display: none;
}

.fade-out {
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .cyber-card {
        padding: 30px 20px;
        margin: 0 15px;
    }

    .back-button {
        top: 15px;
        left: 15px;
        padding: 8px 12px;
        font-size: 12px;
    }

    .card-header h2 {
        font-size: 1.5rem;
    }

    .cyber-logo {
        font-size: 2.5rem;
    }

    .verification-group {
        flex-direction: row;
        gap: 8px;
        align-items: flex-end;
    }

    .verification-group .form-group {
        flex: 1;
        min-width: 0;
    }

    .verify-btn {
        flex-shrink: 0;
        padding: 15px 10px;
        font-size: 11px;
        white-space: nowrap;
        min-width: 75px;
        letter-spacing: 0px;
    }
}

/* 超小屏幕优化 */
@media (max-width: 360px) {
    .verification-group {
        gap: 6px;
    }

    .verify-btn {
        padding: 15px 8px;
        font-size: 10px;
        min-width: 65px;
    }

    .form-group input {
        font-size: 14px;
        padding: 15px 10px;
    }

    .form-group label {
        font-size: 14px;
        left: 10px;
    }
}