:root {
    --primary-color: #2563EB;
    --primary-light: #60A5FA;
    --bg-color: #F3F4F6;
    --card-bg: rgba(255, 255, 255, 0.8);
    --text-color: #1F2937;
    --text-secondary: #6B7280;
    --error-color: #EF4444;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* Background Animation */
.background-animation {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.6;
    animation: float 20s infinite ease-in-out;
}

.circle-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #E0E7FF, #DBEAFE);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.circle-2 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #F0F9FF, #E0F2FE);
    bottom: -150px;
    right: -100px;
    animation-delay: -5s;
}

.circle-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #EFF6FF, #DBEAFE);
    top: 40%;
    left: 40%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

/* Login Container */
.login-container {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 420px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    transform: translateY(0);
    animation: slideIn 0.8s ease-out;
}

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

.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo-icon {
    width: 64px;
    height: 64px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
}

.login-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Form Elements */
.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group input {
    width: 100%;
    padding: 12px 0;
    font-size: 1rem;
    color: var(--text-color);
    border: none;
    border-bottom: 2px solid #E5E7EB;
    background: transparent;
    outline: none;
    transition: border-color 0.3s ease;
}

.input-group label {
    position: absolute;
    top: 12px;
    left: 0;
    font-size: 1rem;
    color: var(--text-secondary);
    pointer-events: none;
    transition: 0.3s ease all;
}

.input-group input:focus ~ label,
.input-group input:not(:placeholder-shown) ~ label {
    top: -10px;
    font-size: 0.75rem;
    color: var(--primary-color);
}

.input-highlight {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.input-group input:focus ~ .input-highlight {
    width: 100%;
}

.btn-login {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    background: var(--primary-color);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

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

.btn-bg {
    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 .btn-bg {
    left: 100%;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    padding: 10px;
    border-radius: 8px;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    text-align: center;
    border: 1px solid rgba(239, 68, 68, 0.2);
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}

.login-footer {
    margin-top: 2rem;
    text-align: center;
}

.login-footer p {
    color: #9CA3AF;
    font-size: 0.75rem;
}