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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-light: #f1f5f9;
    --text-gray: #94a3b8;
    --error-color: #ef4444;
    --success-color: #10b981;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.background-animation {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 0;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    opacity: 0.1;
    filter: blur(60px);
    animation: float 20s infinite ease-in-out;
}

.circle1 {
    width: 400px;
    height: 400px;
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.circle2 {
    width: 300px;
    height: 300px;
    bottom: -50px;
    right: -50px;
    animation-delay: -7s;
}

.circle3 {
    width: 500px;
    height: 500px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-30px, 30px) scale(0.9);
    }
}

.container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 440px;
    padding: 20px;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(99, 102, 241, 0.1);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.login-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    animation: shimmer 3s infinite;
}

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

.logo-container {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeIn 1s ease-out 0.2s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.logo {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient 3s ease infinite;
}

.logo-domain {
    color: var(--text-gray);
}

@keyframes gradient {
    0%, 100% {
        filter: hue-rotate(0deg);
    }
    50% {
        filter: hue-rotate(20deg);
    }
}

.subtitle {
    color: var(--text-gray);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.login-form {
    animation: fadeIn 1s ease-out 0.4s both;
}

.input-group {
    margin-bottom: 32px;
}

.input-wrapper {
    position: relative;
}

.input-wrapper input {
    width: 100%;
    padding: 16px 0;
    font-size: 16px;
    color: var(--text-light);
    background: transparent;
    border: none;
    border-bottom: 2px solid rgba(148, 163, 184, 0.2);
    outline: none;
    transition: all 0.3s ease;
}

.input-wrapper label {
    position: absolute;
    left: 0;
    top: 16px;
    font-size: 16px;
    color: var(--text-gray);
    pointer-events: none;
    transition: all 0.3s ease;
}

.input-wrapper input:focus ~ label,
.input-wrapper input:valid ~ label {
    top: -8px;
    font-size: 12px;
    color: var(--primary-color);
}

.input-underline {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transition: width 0.4s ease;
}

.input-wrapper input:focus ~ .input-underline {
    width: 100%;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 12px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    margin-top: 16px;
}

.submit-btn::before {
    content: '';
    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;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

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

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

.submit-btn.loading .btn-text {
    opacity: 0;
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.submit-btn.loading .btn-loader {
    opacity: 1;
    animation: spin 0.8s linear infinite;
}

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

.error-message {
    color: var(--error-color);
    font-size: 14px;
    text-align: center;
    margin-top: 16px;
    opacity: 0;
    height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.error-message.show {
    opacity: 1;
    height: auto;
    padding: 12px;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.footer-text {
    text-align: center;
    margin-top: 32px;
    color: var(--text-gray);
    font-size: 13px;
    animation: fadeIn 1s ease-out 0.6s both;
}

@media (max-width: 480px) {
    .login-box {
        padding: 32px 24px;
    }

    .logo {
        font-size: 36px;
    }

    .container {
        max-width: 100%;
    }
}

/* Particle effects on hover */
.login-box::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3), transparent);
    border-radius: 50%;
    top: -100px;
    left: -100px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.login-box:hover::after {
    opacity: 1;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.1;
    }
}