/* اضافه کردن transition نرم برای تغییر سایز فونت */
.font-size-transition * {
    transition: font-size 0.3s ease, line-height 0.3s ease;
}

/* جلوگیری از پرش منو */
.nav-menu {
    transition: all 0.3s ease;
}

.sidebar {
    transition: all 0.3s ease;
}

/* =========================
   ROOT VARIABLES
========================= */
:root {
    --app-font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --app-font-size: 16px;
    --primary-color: #1b6ec2;
    --primary-border-color: #1861ac;
    --focus-color: #258cfb;
    --valid-color: #26b050;
    --invalid-color: #e50000;
    --link-color: #006bb7;
}

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

/* =========================
   BASE TYPOGRAPHY (مهم‌ترین بخش)
========================= */
html {
    font-size: var(--app-font-size);
}

body {
    font-family: var(--app-font-family);
    font-size: 1rem;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

    /* همه المان‌ها فقط inherit */
    body * {
        font-family: inherit;
    }

/* =========================
   LINKS & BUTTONS
========================= */
a,
.btn-link {
    color: var(--link-color);
    text-decoration: none;
}

    a:hover,
    .btn-link:hover {
        text-decoration: underline;
    }

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-border-color);
}

/* =========================
   FORMS
========================= */
input,
textarea,
select,
button {
    font-family: inherit;
    font-size: inherit;
}

/* =========================
   FONT UTILITIES
========================= */
.font-vazir {
    font-family: 'Vazir', sans-serif !important;
}

.font-tahoma {
    font-family: Tahoma, sans-serif !important;
}

.font-arial {
    font-family: Arial, sans-serif !important;
}

.font-segoe {
    font-family: 'Segoe UI', sans-serif !important;
}

/* =========================
   FONT SIZE UTILITIES
========================= */
.font-size-sm {
    font-size: 0.875rem !important;
}

.font-size-md {
    font-size: 1rem !important;
}

.font-size-lg {
    font-size: 1.125rem !important;
}

.font-size-xl {
    font-size: 1.5rem !important;
}

/* =========================
   RESPONSIVE FONT
========================= */
@media (max-width: 768px) {
    :root {
        --app-font-size: 14px;
    }
}

@media (max-width: 576px) {
    :root {
        --app-font-size: 13px;
    }
}