/* CSS Variables */
:root {
    --color-background: #0a0a0a;
    --color-surface: #111111;
    --color-surface-elevated: #171717;
    --color-border: #262626;
    --color-border-hover: #404040;
    --color-text-primary: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-primary: #10b981;
    --color-primary-hover: #059669;
    --color-primary-light: rgba(16, 185, 129, 0.1);
    --color-danger: #ef4444;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.2s ease;
}

/* Light Theme */
[data-theme="light"] {
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-elevated: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

/* Login Container */
.login-container {
    display: flex;
    min-height: 100vh;
}

/* Left Side - Branding */
.login-branding {
    flex: 1;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    padding: 48px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

[data-theme="light"] .login-branding {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.login-branding::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.login-branding::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -30%;
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.branding-content {
    position: relative;
    z-index: 1;
}

.brand-logo {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #059669 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 32px;
}

.brand-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.brand-subtitle {
    font-size: 1.125rem;
    color: #94a3b8;
    max-width: 400px;
    line-height: 1.7;
    margin-bottom: 48px;
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.feature-icon {
    width: 44px;
    height: 44px;
    background: rgba(16, 185, 129, 0.15);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 4px;
}

.feature-text p {
    font-size: 0.875rem;
    color: #64748b;
}

.branding-footer {
    position: relative;
    z-index: 1;
}

.branding-footer p {
    font-size: 0.875rem;
    color: #64748b;
}

/* Right Side - Form */
.login-form-wrapper {
    flex: 1;
    background: var(--color-background);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px;
    position: relative;
}

.theme-toggle-wrapper {
    position: absolute;
    top: 24px;
    right: 24px;
}

.theme-toggle {
    width: 44px;
    height: 44px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--color-surface-elevated);
    color: var(--color-text-primary);
    border-color: var(--color-border-hover);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
    display: none;
}

.login-form-container {
    width: 100%;
    max-width: 420px;
}

.login-header {
    margin-bottom: 32px;
    text-align: center;
}

.login-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

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

/* Alert */
.alert {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    font-size: 0.875rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #f87171;
}

/* Form */
.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.forgot-link {
    font-size: 0.8125rem;
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

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

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

.input-icon {
    position: absolute;
    left: 14px;
    color: var(--color-text-muted);
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: 14px 14px 14px 46px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--color-text-primary);
    transition: var(--transition);
}

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

.input-wrapper input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.password-toggle {
    position: absolute;
    right: 14px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.password-toggle:hover {
    color: var(--color-text-secondary);
}

/* Checkbox */
.checkbox-group {
    flex-direction: row;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.checkbox-label input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 1.5px solid var(--color-border);
    border-radius: 4px;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.checkbox-label input:checked + .checkmark {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-label input:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Login Button */
.btn-login {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #059669 100%);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
}

.btn-login:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
}

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

/* Divider */
.divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 28px 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.divider span {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

/* Social Login */
.social-login {
    display: flex;
    gap: 12px;
}

.btn-social {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-social:hover {
    background: var(--color-surface-elevated);
    border-color: var(--color-border-hover);
}

/* Signup Link */
.signup-link {
    text-align: center;
    margin-top: 28px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.signup-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

/* Responsive */
@media (max-width: 1024px) {
    .login-branding {
        display: none;
    }

    .login-form-wrapper {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .login-form-container {
        max-width: 100%;
    }

    .social-login {
        flex-direction: column;
    }

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