:root {
    --primary-color: #007ACC;
    --primary-dark: #005fa3;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --text-dark: #2d3748;
    --text-light: #718096;
    --white: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

/* Animated background shapes */
body::before,
body::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

body::before {
    width: 400px;
    height: 400px;
    background: var(--white);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

body::after {
    width: 300px;
    height: 300px;
    background: var(--white);
    bottom: -150px;
    left: -150px;
    animation-delay: 10s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) translateX(0);
    }

    25% {
        transform: translateY(-30px) translateX(20px);
    }

    50% {
        transform: translateY(-60px) translateX(-20px);
    }

    75% {
        transform: translateY(-30px) translateX(10px);
    }
}

.login-container {
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    overflow: hidden;
    position: relative;
    z-index: 10;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    padding: 40px 30px;
    text-align: center;
    color: var(--white);
    position: relative;
}

.login-header::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-top: 20px solid var(--gradient-end);
}

.login-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    backdrop-filter: blur(10px);
}

.login-icon span {
    font-size: 40px;
    color: var(--white);
}

.login-header h4 {
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 8px 0;
    letter-spacing: -0.5px;
}

.login-subtitle {
    font-size: 14px;
    opacity: 0.9;
    font-weight: 400;
}

.login-body {
    padding: 50px 30px 30px;
}

.form-group {
    margin-bottom: 24px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    transition: color 0.3s;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 20px;
    transition: color 0.3s;
}

.form-group input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 15px;
    color: var(--text-dark);
    transition: all 0.3s;
    background: #f7fafc;
    outline: none;
}

.form-group input:focus {
    border-color: var(--primary-color);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.1);
}

.form-group input:focus+.input-icon {
    color: var(--primary-color);
}

.form-group input:focus~label {
    color: var(--primary-color);
}

.btn-login {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.btn-login::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;
}

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

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

.error-message {
    background: linear-gradient(135deg, #fc4a4a 0%, #f85032 100%);
    color: var(--white);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 14px;
    box-shadow: 0 4px 10px rgba(248, 80, 50, 0.3);
    animation: shake 0.5s;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

.error-message ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.error-message li {
    margin: 8px 0;
    padding-left: 24px;
    position: relative;
}

.error-message li::before {
    content: '⚠';
    position: absolute;
    left: 0;
    font-size: 16px;
}

.login-footer {
    text-align: center;
    padding: 0 30px 30px;
    color: var(--text-light);
    font-size: 13px;
}

.welcome-text {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #e2e8f0;
    color: var(--text-light);
    font-size: 13px;
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 480px) {
    .login-container {
        border-radius: 12px;
    }

    .login-header {
        padding: 30px 20px;
    }

    .login-header h4 {
        font-size: 24px;
    }

    .login-body {
        padding: 40px 20px 20px;
    }

    .login-icon {
        width: 60px;
        height: 60px;
    }

    .login-icon span {
        font-size: 30px;
    }
}

/* Loading state */
.btn-login:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-login.loading::after {
    content: '';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid var(--white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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