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

:root {
    --primary-blue: #0066FF;
    --primary-blue-light: #3385FF;
    --primary-blue-dark: #0052CC;
    --gradient-start: #0066FF;
    --gradient-end: #00C9FF;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: white;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background */
.background {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    background: linear-gradient(135deg, #f8f9ff 0%, #e8f4ff 100%);
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, var(--primary-blue), var(--gradient-end));
    top: -10%;
    right: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    bottom: -10%;
    left: -10%;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #f093fb, #f5576c);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* Main Container */
.signin-container {
    position: relative;
    z-index: 1;
    display: flex;
    min-height: 100vh;
}

/* Left Side - Branding */
.signin-brand {
    flex: 1;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    max-width: 600px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    margin-bottom: 4rem;
}

.brand-logo img {
    height: 48px;
    width: auto;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 500px;
}

.brand-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.brand-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 3rem;
}

.brand-features {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.feature-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.feature-text strong {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.feature-text p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Right Side - Form */
.signin-form-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

.signin-card {
    background: white;
    border-radius: 24px;
    padding: 3rem;
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--border-color);
    animation: slideUp 0.6s ease;
}

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

/* Back Button */
.back-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.back-button:hover {
    color: var(--primary-blue);
    transform: translateX(-4px);
}

/* Form Header */
.form-header {
    margin-bottom: 2rem;
}

.form-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-description {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Social Login */
.social-login {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.social-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: white;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.social-button:hover {
    border-color: var(--primary-blue);
    background: #f8f9ff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.social-button svg {
    flex-shrink: 0;
}

/* Divider */
.divider {
    position: relative;
    text-align: center;
    margin: 2rem 0;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.divider span {
    position: relative;
    background: white;
    padding: 0 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Form */
.signin-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-light);
    pointer-events: none;
}

.form-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    transition: all 0.3s ease;
    background: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1);
}

.form-input::placeholder {
    color: var(--text-light);
}

.toggle-password {
    position: absolute;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.toggle-password:hover {
    color: var(--primary-blue);
}

/* Form Options */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-color: var(--primary-blue);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    color: white;
    font-size: 0.875rem;
    font-weight: bold;
}

.checkbox-text {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.forgot-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

/* Submit Button */
.submit-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
    margin-top: 0.5rem;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 102, 255, 0.4);
}

.submit-button:active {
    transform: translateY(0);
}

.submit-button svg {
    transition: transform 0.3s ease;
}

.submit-button:hover svg {
    transform: translateX(4px);
}

/* Sign Up Prompt */
.signup-prompt {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.signup-prompt p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.signup-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.signup-link:hover {
    color: var(--primary-blue-dark);
}

/* Form Footer */
.form-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.form-footer a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

.form-footer a:hover {
    color: var(--primary-blue);
}

/* Loading State */
.submit-button.loading {
    pointer-events: none;
    opacity: 0.7;
}

.submit-button.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid white;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: 0.5rem;
}

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

/* Error State */
.form-input.error {
    border-color: #ef4444;
}

.form-input.error:focus {
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Success Message */
.success-message {
    padding: 1rem;
    background: #10b981;
    color: white;
    border-radius: 12px;
    font-size: 0.9375rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1rem;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .signin-brand {
        max-width: 500px;
        padding: 2rem;
    }

    .brand-title {
        font-size: 2.5rem;
    }
    
    .signin-form-container {
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .signin-container {
        flex-direction: column;
    }
    
    .signin-brand {
        max-width: 100%;
        padding: 2rem;
        min-height: auto;
    }
    
    .brand-logo {
        margin-bottom: 2rem;
    }
    
    .brand-title {
        font-size: 2rem;
    }
    
    .brand-description {
        font-size: 1.125rem;
        margin-bottom: 2rem;
    }
    
    .brand-features {
        gap: 1.5rem;
    }
    
    .feature-icon {
        font-size: 1.5rem;
    }
    
    .signin-form-container {
        padding: 2rem 1.5rem;
    }
    
    .signin-card {
        padding: 2rem 1.5rem;
        box-shadow: var(--shadow-lg);
    }
    
    .form-title {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .signin-brand {
        padding: 1.5rem;
    }
    
    .brand-logo img {
        height: 40px;
    }
    
    .brand-name {
        font-size: 1.25rem;
    }
    
    .brand-title {
        font-size: 1.75rem;
    }
    
    .brand-description {
        font-size: 1rem;
    }
    
    .signin-form-container {
        padding: 1.5rem 1rem;
    }
    
    .signin-card {
        padding: 1.5rem;
    }
    
    .form-title {
        font-size: 1.5rem;
    }
    
    .social-button {
        font-size: 0.875rem;
        padding: 0.875rem;
    }
    
    .form-input {
        padding: 0.875rem 0.875rem 0.875rem 2.75rem;
        font-size: 0.9375rem;
    }
    
    .submit-button {
        padding: 0.875rem 1.5rem;
        font-size: 0.9375rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--primary-blue);
    color: white;
}

::-moz-selection {
    background: var(--primary-blue);
    color: white;
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}