* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --dark: #0f172a;
    --gray: #64748b;
    --light-gray: #f1f5f9;
    --error: #ef4444;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 2rem;
    position: relative;
    overflow: hidden;
}
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}
.login-container {
    background: white;
    border-radius: 24px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.3);
    max-width: 480px;
    width: 100%;
    position: relative;
    z-index: 1;
    animation: slideUp 0.5s ease-out;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.login-header {
    padding: 3rem 3rem 2rem;
    text-align: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}
.logo-img {
    height: 48px;
    width: auto;
}
.logo-text {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}
.login-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}
.login-header p {
    color: var(--gray);
    font-size: 1rem;
}
.login-body {
    padding: 2.5rem 3rem 3rem;
}
.form-group {
    margin-bottom: 1.5rem;
}
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-size: 0.9375rem;
    font-weight: 600;
}
.input-wrapper {
    position: relative;
}
.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
    font-size: 1.125rem;
}
.form-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 3rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--dark);
    background-color: var(--light-gray);
    border: 2px solid transparent;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}
.form-input:hover {
    background-color: #e2e8f0;
}
.form-input:focus {
    outline: none;
    background-color: white;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}
.form-input::placeholder {
    color: #94a3b8;
}
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.checkbox-wrapper input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}
.checkbox-wrapper label {
    font-size: 0.875rem;
    color: var(--gray);
    cursor: pointer;
}
.forgot-link {
    font-size: 0.875rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}
.forgot-link:hover {
    color: var(--primary-dark);
}
.btn-login {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.4);
}
.btn-login:active {
    transform: translateY(0);
}
.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 2rem 0;
}
.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}
.divider span {
    padding: 0 1rem;
    color: var(--gray);
    font-size: 0.875rem;
    font-weight: 500;
}
.social-login {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}
.btn-social {
    padding: 0.875rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--dark);
    background: white;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn-social:hover {
    border-color: var(--primary);
    background: var(--light-gray);
}
.signup-link {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    color: var(--gray);
    font-size: 0.9375rem;
}
.signup-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}
.signup-link a:hover {
    color: var(--primary-dark);
}
.error-message {
    background: #fee2e2;
    color: #991b1b;
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
    display: none;
    align-items: center;
    gap: 0.5rem;
}
.error-message.show {
    display: flex;
}
.back-home {
    position: absolute;
    top: 2rem;
    left: 2rem;
    color: white;
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    z-index: 10;
}
.back-home:hover {
    transform: translateX(-5px);
}
@media (max-width: 640px) {
    body { padding: 1rem; }
    .login-header { padding: 2rem 2rem 1.5rem; }
    .login-body { padding: 2rem; }
    .login-header h1 { font-size: 1.75rem; }
    .social-login { grid-template-columns: 1fr; }
    .back-home { top: 1rem; left: 1rem; }
}