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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

.login-container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
}

.login-card {
    background: var(--bg-white);
    border-radius: 0;
    padding: 24px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    position: relative;
    z-index: 10;
    animation: slideUp 0.6s ease-out;
}

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

.logo-section {
    text-align: center;
    margin-bottom: 24px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.3);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.logo-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.logo-section h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
}

.login-form {
    margin-top: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: 10px 12px 10px 40px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 0;
    outline: none;
    transition: all 0.3s ease;
    background: var(--bg-light);
    color: var(--text-primary);
}

.input-wrapper input:focus {
    border-color: var(--primary-color);
    background: var(--bg-white);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1);
}

.input-wrapper input::placeholder {
    color: var(--text-secondary);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-size: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-right: 6px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.forgot-password {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

.forgot-password:hover {
    color: var(--primary-dark);
}

.login-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 0;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    position: relative;
    overflow: hidden;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.5);
}

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

.login-btn.loading {
    pointer-events: none;
}

.btn-text {
    display: inline-block;
    transition: opacity 0.3s;
}

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

.btn-loader {
    display: none;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.login-btn.loading .btn-loader {
    display: block;
}

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

.error-message {
    margin-top: 12px;
    padding: 8px 12px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    border-radius: 0;
    color: var(--error-color);
    font-size: 12px;
    display: none;
    animation: shake 0.4s ease-in-out;
}

.error-message.show {
    display: block;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.login-footer {
    margin-top: 20px;
    text-align: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 11px;
    color: var(--text-secondary);
}

/* Background Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float-particle 20s infinite;
}

.particle:nth-child(1) {
    width: 80px;
    height: 80px;
    left: 10%;
    top: 20%;
    animation-delay: 0s;
    animation-duration: 25s;
}

.particle:nth-child(2) {
    width: 60px;
    height: 60px;
    right: 15%;
    top: 30%;
    animation-delay: 3s;
    animation-duration: 20s;
}

.particle:nth-child(3) {
    width: 100px;
    height: 100px;
    left: 20%;
    bottom: 20%;
    animation-delay: 5s;
    animation-duration: 30s;
}

.particle:nth-child(4) {
    width: 70px;
    height: 70px;
    right: 25%;
    bottom: 30%;
    animation-delay: 2s;
    animation-duration: 22s;
}

.particle:nth-child(5) {
    width: 90px;
    height: 90px;
    left: 50%;
    top: 10%;
    animation-delay: 4s;
    animation-duration: 28s;
}

@keyframes float-particle {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
        opacity: 0.3;
    }
    25% {
        transform: translate(100px, 100px) rotate(90deg);
        opacity: 0.5;
    }
    50% {
        transform: translate(50px, 200px) rotate(180deg);
        opacity: 0.7;
    }
    75% {
        transform: translate(-50px, 100px) rotate(270deg);
        opacity: 0.5;
    }
}

/* Responsive Design */
@media (max-width: 480px) {
    .login-card {
        padding: 20px 16px;
    }
    
    .logo-section h1 {
        font-size: 22px;
    }
    
    .logo-icon {
        width: 44px;
        height: 44px;
    }
}