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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1a3e 50%, #0d1b2a 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #e0e0e0;
}

/* 背景动画粒子 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 255, 136, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0, 153, 255, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-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: 48px 36px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 36px;
}

.logo-icon {
    font-size: 56px;
    margin-bottom: 12px;
    filter: drop-shadow(0 0 20px rgba(0, 255, 136, 0.3));
}
.logo-icon img {
    width: 64px;
    height: 64px;
    object-fit: contain;
}

.login-header h1 {
    font-size: 26px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 6px;
    letter-spacing: 2px;
}

.login-header p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    color: #ffffff;
    font-size: 16px;
    transition: all 0.3s ease;
    outline: none;
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.form-group input:focus {
    border-color: #00ff88;
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
    background: rgba(255, 255, 255, 0.08);
}

.error-msg {
    color: #ff4757;
    font-size: 13px;
    text-align: center;
    padding: 10px;
    background: rgba(255, 71, 87, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(255, 71, 87, 0.2);
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #00ff88, #00cc6a);
    border: none;
    border-radius: 12px;
    color: #0a0e27;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 2px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 255, 136, 0.3);
}

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

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.login-footer {
    margin-top: 28px;
    text-align: center;
}

.login-footer p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.35);
    line-height: 1.8;
}

.signup-link a {
    color: #00ff88;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.3s;
}
.signup-link a:hover {
    color: #00cc6a;
    text-decoration: underline;
}

.success-msg {
    color: #00ff88;
    font-size: 13px;
    text-align: center;
    padding: 10px;
    background: rgba(0, 255, 136, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(0, 255, 136, 0.2);
}

.login-footer a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.3s;
}
.login-footer a:hover {
    color: #00ff88;
}