:root {
    --primary: #1e40af;
    --primary-dark: #1e3a8a;
    --secondary: #3b82f6;
    --accent: #06b6d4;
    --light: #f8fafc;
    --dark: #0f172a;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --white: #ffffff;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

html {
  font-size: 11px; 
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    z-index: -1;
}

/* Animated background particles */
.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    pointer-events: none;
    animation: float 6s ease-in-out infinite;
}

.particle:nth-child(1) {
    top: 20%;
    left: 20%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 60%;
    left: 80%;
    width: 40px;
    height: 40px;
    animation-delay: 2s;
}

.particle:nth-child(3) {
    top: 80%;
    left: 40%;
    width: 80px;
    height: 80px;
    animation-delay: 4s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.7;
    }

    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 0.3;
    }
}

/* Login Page */
.login-container {
    width: 400px;
    margin: 60px auto;
    padding: 48px 40px;
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    transition: var(--transition);
}

.login-container:hover {
    transform: translateY(-2px);
    box-shadow: 0 32px 64px -12px rgba(0, 0, 0, 0.35);
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.logo-header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

.logo-icon {
    width: 100px;
    height: 100px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    color: white;
    font-size: 28px;
}

.logo-icon:hover {
    transform: scale(1.05) rotate(2deg);
}

.logo-header h2 {
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    font-size: 1.75rem;
    letter-spacing: -0.025em;
}

.logo-header p {
    color: var(--gray);
    font-size: 0.95rem;
    font-weight: 400;
    margin: 0;
}

/* Form Styles */
.form-label {
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    font-size: 0.875rem;
    letter-spacing: 0.025em;
}

.input-group {
    position: relative;
    margin-bottom: 0;
}

.input-group-text {
    background: var(--light);
    border: 2px solid var(--gray-light);
    border-right: none;
    color: var(--gray);
    font-size: 1.1rem;
    padding: 12px 16px;
    border-radius: 12px 0 0 12px;
    transition: var(--transition);
}

.form-control {
    border: 2px solid var(--gray-light);
    border-left: none;
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 0 12px 12px 0;
    background: var(--white);
    transition: var(--transition);
    font-weight: 400;
}

.form-control:focus {
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    border-color: var(--secondary);
    background: var(--white);
}

.form-control:focus+.password-toggle {
    color: var(--secondary);
}

.input-group:focus-within .input-group-text {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.05);
    color: var(--secondary);
}

.input-group:focus-within .form-control {
    border-color: var(--secondary);
}

/* Password toggle */
.password-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--gray);
    cursor: pointer;
    z-index: 10;
    padding: 4px;
    border-radius: 6px;
    transition: var(--transition);
    font-size: 1.1rem;
}

.password-toggle:hover {
    color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.password-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Button */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    padding: 14px 24px;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 12px;
    letter-spacing: 0.025em;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px -5px rgba(30, 64, 175, 0.4);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

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

/* Error Alert */
.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #dc2626;
    border-radius: 12px;
    padding: 12px 16px;
    font-weight: 500;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

/* Footer */
.footer-text {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-light);
}

.footer-text small {
    color: var(--gray);
    font-size: 0.8rem;
    font-weight: 400;
}

/* Animations */
.fade-in {
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .login-container {
        margin: 40px 20px;
        padding: 32px 24px;
        max-width: none;
    }

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

    body::before {
        opacity: 0.7;
    }
}

/* Loading state */
.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Focus indicators for accessibility */
/* .form-control:focus,
.btn:focus,
.password-toggle:focus {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
} */