/* 奢华钻石风格 - Luxury Diamond Style */

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

body {
    font-family: 'Playfair Display', 'Georgia', 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(0, 0, 0, 0.8);
    border: 1px solid #d4af37;
    border-radius: 25px;
    color: #d4af37;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.back-button:hover {
    background: rgba(212, 175, 55, 0.1);
    border-color: #ffd700;
    color: #ffd700;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.5);
}

.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 - 黑金奢华 */
.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 25%, #2d2d2d 50%, #1a1a1a 75%, #0a0a0a 100%);
    overflow: hidden;
}

.background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 50%, rgba(212, 175, 55, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(212, 175, 55, 0.1) 0%, transparent 50%);
}

/* 钻石动画 */
.diamond {
    position: absolute;
    font-size: 30px;
    animation: sparkle 3s ease-in-out infinite;
    filter: drop-shadow(0 0 10px rgba(212, 175, 55, 0.8));
}

.diamond1 {
    top: 20%;
    left: 15%;
    animation-delay: 0s;
}

.diamond2 {
    top: 60%;
    right: 20%;
    animation-delay: 1s;
    font-size: 25px;
}

.diamond3 {
    bottom: 25%;
    left: 25%;
    animation-delay: 2s;
    font-size: 20px;
}

@keyframes sparkle {
    0%, 100% {
        transform: rotate(0deg) scale(1);
        opacity: 0.8;
    }
    50% {
        transform: rotate(180deg) scale(1.2);
        opacity: 1;
    }
}

/* 闪光效果 */
.sparkle {
    position: absolute;
    font-size: 15px;
    animation: twinkle 2s linear infinite;
}

.sparkle1 { top: 10%; left: 30%; animation-delay: 0s; }
.sparkle2 { top: 40%; right: 30%; animation-delay: 0.5s; }
.sparkle3 { bottom: 30%; left: 40%; animation-delay: 1s; }
.sparkle4 { bottom: 10%; right: 25%; animation-delay: 1.5s; }

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

/* 金线装饰 */
.gold-line {
    position: absolute;
    background: linear-gradient(90deg, transparent, #d4af37, transparent);
    height: 1px;
    width: 200px;
    animation: slide 5s linear infinite;
}

.line1 {
    top: 30%;
    animation-delay: 0s;
}

.line2 {
    bottom: 30%;
    animation-delay: 2.5s;
}

@keyframes slide {
    0% { left: -200px; }
    100% { left: 100%; }
}

/* 登录容器样式 */
.login-container,
.register-container,
.forgot-container {
    background: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(20px);
    border: 2px solid #d4af37;
    border-radius: 0;
    padding: 50px 40px;
    width: 90%;
    max-width: 420px;
    box-shadow: 0 0 50px rgba(212, 175, 55, 0.3),
                inset 0 0 30px rgba(212, 175, 55, 0.05);
    position: relative;
    z-index: 10;
    display: block;
    animation: luxuryFadeIn 0.8s 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 luxuryFadeIn {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 奢华徽章 */
.luxury-badge {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #d4af37, #f4e5c2, #d4af37);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.5);
}

/* 表单标题 */
.form-title {
    text-align: center;
    color: #d4af37;
    font-size: 32px;
    margin-bottom: 5px;
    margin-top: 20px;
    font-weight: 300;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.form-subtitle {
    text-align: center;
    color: #888;
    margin-bottom: 35px;
    font-size: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* 表单组 */
.form-group {
    position: relative;
    margin-bottom: 30px;
}

.form-group input {
    width: 100%;
    padding: 12px 0;
    font-size: 16px;
    border: none;
    border-bottom: 1px solid #444;
    background: transparent;
    outline: none;
    transition: all 0.3s;
    color: #fff;
}

.form-group label {
    position: absolute;
    top: 12px;
    left: 0;
    font-size: 14px;
    color: #888;
    pointer-events: none;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, #d4af37, #f4e5c2, #d4af37);
    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: 10px;
    color: #d4af37;
}

/* 验证码组 */
.verification-group {
    display: flex;
    gap: 15px;
    align-items: flex-end;
}

.verification-group input {
    flex: 1;
}

.send-code-btn {
    padding: 10px 20px;
    background: transparent;
    color: #d4af37;
    border: 1px solid #d4af37;
    cursor: pointer;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
    transition: all 0.3s;
}

.send-code-btn:hover {
    background: #d4af37;
    color: #000;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.4);
}

.send-code-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 表单选项 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: #888;
    font-size: 12px;
    text-transform: uppercase;
}

.remember-me input {
    display: none;
}

.checkmark {
    width: 16px;
    height: 16px;
    border: 1px solid #d4af37;
    position: relative;
    transition: all 0.3s;
}

.remember-me input:checked ~ .checkmark {
    background: #d4af37;
}

.remember-me input:checked ~ .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #000;
    font-size: 10px;
}

.forgot-password {
    color: #d4af37;
    text-decoration: none;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color 0.3s;
}

.forgot-password:hover {
    color: #f4e5c2;
}

/* 提交按钮 */
.submit-btn {
    width: 100%;
    padding: 15px;
    background: transparent;
    color: #d4af37;
    border: 2px solid #d4af37;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
}

.submit-btn:hover {
    background: #d4af37;
    color: #000;
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.4);
}

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

.submit-btn:hover .btn-shimmer {
    left: 100%;
}

/* 分隔线 */
.divider {
    display: flex;
    align-items: center;
    margin: 30px 0;
    gap: 15px;
}

.divider-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, #d4af37, transparent);
}

.divider span {
    color: #d4af37;
    font-size: 12px;
    letter-spacing: 2px;
    font-weight: 600;
}

/* 社交登录 */
.social-login {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.social-btn {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: 1px solid #444;
    color: #888;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s;
    font-size: 12px;
    text-transform: uppercase;
}

.gold-btn {
    border-color: #d4af37;
    color: #d4af37;
}

.silver-btn {
    border-color: #c0c0c0;
    color: #c0c0c0;
}

.social-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.3);
}

.gold-btn:hover {
    background: #d4af37;
    color: #000;
}

.silver-btn:hover {
    background: #c0c0c0;
    color: #000;
}

/* 切换表单 */
.switch-form {
    text-align: center;
    color: #888;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.switch-form a {
    color: #d4af37;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.switch-form a:hover {
    color: #f4e5c2;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-container,
    .register-container,
    .forgot-container {
        padding: 40px 30px;
        width: 95%;
    }
    
    .form-title {
        font-size: 24px;
    }
    
    .luxury-badge {
        width: 50px;
        height: 50px;
        font-size: 24px;
    }
}