:root {
    --space-root: 1rem;
    --space-xs: calc(var(--space-root) / 2);
    --space-s: calc(var(--space-root) / 1.5);
    --space-m: var(--space-root);
    --space-l: calc(var(--space-root) * 1.5);
    --space-xl: calc(var(--space-root) * 2);
    --color-primary: #4f46e5;
    --color-primary-light: #6366f1;
    --color-primary-dark: #4338ca;
    --color-secondary: #1e293b;
    --color-error: #5e0000;
    --color-success: #16a34a;
    --color-text: #334155;
    --color-text-light: #64748b;
    --color-bg: #f8fafc;
    --color-card: #ffffff;
    --base-border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --duration: 200ms;
    --font-family: 'Vazir', sans-serif;
    --font-size: 1rem;
}

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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--space-m);
    font-family: var(--font-family);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    background-image: radial-gradient(at top left, #e0e7ff, transparent),
    radial-gradient(at bottom right, #c7d2fe, transparent);
}

button, input, textarea {
    font-family: inherit;
}

.container {
    width: 100%;
    max-width: 28rem;
    margin: 0 auto;
}

.login-card {
    background-color: var(--color-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.login-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card-header {
    padding: var(--space-xl);
    text-align: center;
    background-color: var(--color-primary);
    color: white;
}

.logo {
    width: 5rem;
    height: 5rem;
    margin: 0 auto var(--space-m);
    border-radius: 50%;
    object-fit: contain;
    background-color: white;
    padding: 0.2rem;
    box-shadow: var(--shadow);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.card-subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
}

.card-body {
    padding: var(--space-xl);
}

.form-group {
    margin-bottom: var(--space-l);
}

.form-label {
    display: block;
    margin-bottom: var(--space-xs);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

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

.input-icon {
    position: absolute;
    left: var(--space-m);
    color: var(--color-primary);
    pointer-events: none;
    transition: color var(--duration) var(--ease);
}

.form-input {
    width: 100%;
    padding: var(--space-m) var(--space-m) var(--space-m) calc(var(--space-xl) + var(--space-xs));
    font-size: var(--font-size);
    border: 1px solid #e2e8f0;
    border-radius: var(--base-border-radius);
    background-color: #f8fafc;
    transition: all var(--duration) var(--ease);
    direction: ltr;
    text-align: center;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
    background-color: white;
}

.form-input:focus + .input-icon {
    color: var(--color-primary-dark);
}

.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: var(--space-m);
    font-size: 1rem;
    font-weight: 500;
    color: white;
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--base-border-radius);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
}

.btn:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
}

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

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.3);
}

.footer-text {
    margin-top: var(--space-l);
    font-size: 0.875rem;
    text-align: center;
    color: var(--color-text-light);
}

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

.footer-link:hover {
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 640px) {
    .login-card {
        border-radius: 0;
    }

    .card-header, .card-body {
        padding: var(--space-l);
    }
}

/* Loading state */
.btn--loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn--loading:after {
    content: "";
    position: absolute;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

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

/* Error state */
.input-error .form-input {
    border-color: var(--color-error);
}

.input-error .form-input:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.2);
}

.error-message {
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--color-error);
}